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SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 

Form 10-K 

☑ 	 	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934	
 	
 	 	For the fiscal year ended December 31, 2001	
 	
or	
 	
o	 	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934	
Commission File Number: 0-22873 

HYSEQ, INC. 
(Exact Name of Registrant as Specified in Its Charter) 
 	 	 	
Nevada	 	36-3855489	
(State or Other Jurisdiction of
Incorporation or Organization)	 	(I.R.S. Employer
Identification No.)	
 	
670 Almanor Avenue, Sunnyvale, CA
(Address of principal executive offices)	 	94085
(Zip Code)	
Registrant’s telephone number, including area code: 
408-524-8100 
Securities registered pursuant to Section 12(b) of the Exchange Act: None 
Securities registered pursuant to Section 12(g) of the Exchange Act: 
Common Stock, $.001 

      Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes ☑          No o 
      Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     o 
      The aggregate market value of the common stock held by non-affiliates of the Registrant on March 15, 2002 was $94,672,151 based on the last sale price of the common stock as reported by the Nasdaq Stock Market. 
      As of March 15, 2002, the Registrant had 19,371,052 shares of common stock outstanding. 
DOCUMENTS INCORPORATED BY REFERENCE 
      Portions of the Registrant’s Definitive Proxy Statement, which will be filed with the Commission pursuant to Section 14A in connection with the 2002 meeting of stockholders, are incorporated by reference into Part III of this Form 10-K. 

TABLE OF CONTENTS
									
PART I	
	Item 1. Business	
	Item 2. Properties	
	Item 3. Legal Proceedings	
	Item 4. Submission of Matters to a Vote of Security Holders	
PART II	
	Item 5. Market for Registrant’s Common Equity and Related Stockholder Matters	
	Item 6. Selected Consolidated Financial Data	
	Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations	
	Item 7A. Qualitative and Quantitative Disclosures About Market Risk	
	Item 8. Financial Statements and Supplementary Data	
	Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	
PART III	
	Item 10. Directors and Executive Officers of the Registrant	
	Item 11. Executive Compensation	
	Item 12. Security Ownership of Certain Beneficial Owners and Management	
	Item 13. Certain Relationships and Related Transactions	
PART IV	
	Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K	
EXHIBIT 4.8	
EXHIBIT 4.9	
EXHIBIT 4.10	
EXHIBIT 10.16	
EXHIBIT 10.17	
EXHIBIT 10.18	
EXHIBIT 10.19	
EXHIBIT 10.20	
EXHIBIT 10.21	
EXHIBIT 10.22	
EXHIBIT 10.23	
EXHIBIT 10.24	
EXHIBIT 10.25	
EXHIBIT 10.26	
EXHIBIT 21.1	
EXHIBIT 23.1	
EXHIBIT 23.2	

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PART I 
Item 1.     Business 
      This Annual Report on Form 10-K contains historical information as well as forward-looking statements that involve risks and uncertainty. Our actual results could differ significantly from discussions and forward-looking statements in this document. Factors that could cause or contribute to such differences include but are not limited to those discussed in this section under the caption “Risk Factors,” as well as those under “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” and those discussed elsewhere in this Annual Report on Form 10-K. 
Company Overview 
      We were incorporated in Illinois in August 1992 and reincorporated as a Nevada corporation on November 12, 1993. We have being doing business as Hyseq Pharmaceuticals, Inc. since October 2001. 
      We are engaged in research and development of novel biopharmaceutical protein-based products for the treatment of human disease from our collection of proprietary genes discovered using our high-throughput signature-by-hybridization platform. We are researching several product candidates to treat a variety of serious diseases and medical conditions. These product candidates target several markets, including cardiovascular disease and oncology. We intend to develop and commercialize these types of product candidates on our own or in collaboration with other biotechnology or pharmaceutical companies. 
      We believe our signature-by-hybridization platform, which is related to our proprietary sequencing-by-hybridization (or SBH) technology, gives us a significant advantage in discovering novel, rarely-expressed genes. We believe we possess one of the most important proprietary databases of full-length human gene sequences and have the potential to develop a significant pipeline of product candidates for research and development. Previously, our activities have focused primarily on full-length gene sequencing, patenting, bioinformatics, cloning, and early stage research activities to prioritize potential therapeutic protein candidates. As of March 15, 2002, we had filed patent applications on approximately 10,000 full-length human gene sequences. We are accelerating our research activities to elucidate the role of novel genes in our proprietary database, their encoded proteins and corresponding antibodies. Our database includes chemokines, growth factors, stem cell factors, interferons, integrins, hormones, receptors and other potential protein therapeutics or drug targets. Our focused bioinformatics and screening capabilities have significantly enhanced our understanding of the biological activity of these genes and their corresponding proteins, enabling us to file strategic patent applications that encompass both composition of matter and method of use claims. 
      We are primarily focused on discovering and developing therapeutic protein-based products, as we believe that naturally occurring therapeutic proteins have several commercial advantages over small molecule drugs. 
      In the near term, we are balancing the risks in developing therapeutics from our full-length gene database by also focusing on an early stage clinical product candidate acquired through collaboration with Amgen, Inc. We entered into this collaboration in January 2002, with the goal of developing and commercializing alfimeprase, a thrombolytic enzyme, for the treatment of peripheral arterial occlusion (or PAO) and other cardiovascular indications. Pre-clinical studies suggest that alfimeprase is a promising agent for dissolving blood clots (clot lysis) and may be well suited for the PAO indication. 
Scientific and Industry Background 
      Genes are the hereditary units that control the structure, health and function of all organisms. The study of genes and their functions has led to the development of products and services for diverse markets, ranging from health care to agriculture. Genomics, the study of all the genetic information of an organism, is a growing field that is expected to lead to the development of additional gene-based therapeutics. The large market potential for gene-based products has led to a worldwide effort to sequence the human genome in the search for new proteins and drug targets for the treatment of disease and unmet medical needs. 
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      The complete set of genetic information of each organism, known as its genome, is encoded in its deoxyribonucleic acid (or DNA). DNA, which is found in the nucleus of cells, is a molecule comprising two complementary strands entwined in the form of a double helix. Various combinations of four chemical building blocks or “bases” of DNA, adenine (A), thymine (T), cytosine (C) and guanine (G), are linked together in series to form each DNA strand. The bases of one DNA strand bind to the bases of the other strand in a specific fashion to form base pairs: A pairs with T and G pairs with C. In humans, there are approximately six billion base pairs organized into 23 pairs of DNA structures called chromosomes. 
      With the development of automated, high throughput DNA sequencing techniques in the early 1990s, researchers accelerated the discovery of novel genes and the proteins they express. Companies in the private sector, as well as publicly-funded research efforts, initiated large-scale activities to create databases of DNA sequence information that could be used to search for important new proteins or drug targets. Early commercial efforts focused on identification of expressed sequence tags, or ESTs, which are short DNA sequences that represent a portion of an expressed gene. At the same time, the U.S. government-funded Human Genome Project, in competition with other national governments and privately funded efforts, set about sequencing the entire human genome. The science of bioinformatics has arisen out of the need to analyze and derive value from this vast quantity of DNA sequence data. Bioinformatics involves the use of high-powered computers, software and analytical tools to interpret, compare and analyze DNA sequence data and can be used to assist in identifying those genes and proteins that are likely to play a meaningful role in human health. In addition to using bioinformatics to screen DNA sequence databases for medically relevant genes, researchers can use bioinformatics to infer important information about a newly discovered gene from its DNA sequence. Drawing on information about previously known genes, researchers can perform comparative analyses with newly discovered genes to obtain insight into their potential functions. Although bioinformatics represents a fundamental advance in the analysis of DNA sequence data, significant challenges remain in discovering how genes and proteins affect human biology and disease. 
      Prior to the development of robust large DNA sequence databases and the requisite analytical software needed to facilitate bioinformatics analyses, the discovery and development of therapeutic proteins typically involved an intense focus on biological processes of the human body or the pathology of disease. Researchers would study a particular biological process or disease and try to understand the underlying molecular mechanisms that could lead to the identification of potential therapeutic products. This time- and labor-intensive process yielded relatively few newly identified therapeutic protein product candidates. The introduction of methods for rapid DNA sequencing and bioinformatics in the early 1990s enabled an alternative approach to therapeutic protein discovery. Rather than study the biology of an organism or disease to discover a new therapeutic protein, a number of companies directed their efforts to discovering new proteins through bioinformatics and then studying the biology of these newly discovered proteins to determine whether they have therapeutic applications. We believe that over time this approach has the potential to yield a substantial number of therapeutic candidates, and ultimately approved products, faster and at lower cost than the traditional biology-only driven approach. 
      Genes that encode proteins are composed of two principal types of information: the primary coding sequence that dictates the composition of the protein as well as additional regulatory sequences that control the actual expression of a gene. The process by which the coding sequence of a gene directs the production of a protein begins with a process in which the gene is copied into a related molecule called messenger ribonucleic acid (or mRNA). The mRNA is used as a template to combine amino acids together in a particular order to form a protein. The regulatory region of a gene is responsible for determining the rate of production of mRNA copies, which can therefore directly affect the amount of the protein product that is produced by the cell. Additional factors besides mRNA abundance can affect the levels of proteins in a cell, and proteins themselves can be modified to affect their biochemical activities. The addition, deletion or substitution of one or more bases in a gene, known as a mutation, can alter the resultant protein’s structure and/or level of expression and result in a disease. Most diseases are believed to be polygenic, meaning that the activities of multiple genes interact to cause the disease. In developing a drug for treatment of a polygenic disease, the most effective strategy may be best selected when all genes that interact to cause or affect the disease are known. 
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      Therapeutic proteins include naturally occurring proteins that are administered to patients as drugs. Some naturally occurring proteins replace or supplement a protein that is deficient in the body or defective. Others signal the body to initiate or cease a biological function. Examples of therapeutic proteins include ligands such as insulin, which regulates glucose metabolism for the treatment of diabetes, and enzymes such as tissue plasminogen activator, which converts plaminogen to plasmin, a protein that can break down blood clots. Other therapeutic protein-based drugs, although not naturally occurring, have been engineered to provide medical benefit. Examples include monoclonal antibodies such as Herceptin, which targets and destroys breast cancer cells, and soluble receptors such as Enbrel, which binds to and thereby blocks the effect of a ligand implicated in rheumatoid arthritis. Therapeutic proteins and other protein-based products represent a promising class of drugs in the biotechnology industry. 
      The use of recombinant DNA technology to manufacture therapeutic proteins has been a major breakthrough for the pharmaceutical industry. Recombinant DNA technology is used to insert a gene into non-human production cells. These cells, which are grown in culture, are engineered to produce the desired protein in large quantities. The protein is then isolated from the culture and purified. Recombinant proteins have several advantages over proteins derived from natural sources, such as human or animal pooled blood. First, recombinant DNA technology enables the large-scale production of certain therapeutic proteins that are scarce and thus too difficult or costly to derive from human or animal sources in therapeutically useful quantities. Second, recombinant DNA technology significantly reduces the contamination risks from blood-borne pathogens that cause diseases. Finally, recombinant DNA technology allows the production of therapeutic proteins using reproducible methodologies. This reproducibility in manufacturing provides for consistency between batches of the final protein product, a necessity for creating a safe drug capable of receiving regulatory approval. 
Strategy 
      Our execution strategy will involve a combination of carefully-staged internal infrastructure growth, strategic relationships to share research and development efforts and marketing opportunities with other biotechnology and pharmaceutical companies, inlicensing product candidates and outsourcing, on a fee-for-service basis, to accelerate and expand our drug discovery and development efforts. Our goal is to build a fully integrated biopharmaceutical company that commercializes novel therapeutic proteins and other protein-based products derived from our proprietary portfolio of protein candidates. The first part of our strategy involves internal infrastructure growth to expand our staff and bring additional expertise into the company. Our early efforts have been focused on gene discovery, which requires a research staff of molecular biologists and bioinformatics personnel. As we continue characterize the genes in our database, we have expanded our research and development staff to include additional expertise in basic biology, physiology, cell biology and protein sciences. Further progress into development will require additional expertise in project management and product development including pharmacology, toxicology, assay development, formulation and process development, medical and regulatory affairs, quality control and quality assurance and an expanded capability in facilities and engineering. Expertise in these areas will be required to ensure that we meet FDA and foreign regulatory requirements for conducting clinical trials. 
      The second part of our strategy is to focus on the discovery of therapeutic proteins. We are pursuing a focused strategy to identify the subset of genes that we believe have the highest probability of coding for proteins with therapeutic potential. Specifically, we are focusing on key protein categories that have members with demonstrated therapeutic potential or medically relevant biological activity. We are currently utilizing a number of methods to help define the utility of these genes. Once we have identified a protein candidate with relevant biological activity, we will seek to develop a therapeutic protein directly, or, where appropriate, develop a monoclonal antibody or soluble receptor that targets the protein. 
      The third part of our strategy involves strategic relationships to share research and development efforts and marketing opportunities with other biotechnology and pharmaceutical companies. We believe this approach will greatly enhance our chances to move a number of drug candidates into clinical trials over the next several years. We are now focusing on new corporate relationships with other biotechnology and pharmaceutical companies to share costs and expertise of identifying and developing product candidates. This 
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focus also includes plans to collaborate with strategic partners with expertise to develop antibodies and small molecules from our proprietary targets. 
      The fourth part of our strategy involves outsourcing, on a fee-for-service basis, to accelerate and expand our drug discovery and development efforts. Initially, we intend to use outsourcing while we expand our in-house capabilities, although we expect to continue to use outsourcing when there are opportunities to accelerate and expand our drug discovery and development efforts. We currently use contract research organizations and collaborators to supplement our ability to conduct in vitro and in vivo testing of our therapeutic protein candidates. We also intend to use contract organizations to conduct good laboratory practices (GLP) toxicology and other studies required for filing an Investigational New Drug (IND) application, for the production of any current good manufacturing practices, or cGMP, drug and for conducting clinical trials on our lead therapeutic protein candidates. 
      Our strategy also encompasses pursuing comprehensive intellectual property protection. We seek to establish patent priority for our gene and protein discoveries at the earliest possible time. We use data generated from bioinformatics and exploratory biology to enhance our patent applications. 
      Because we expect to generate more product candidates than we have the capacity to develop on our own in the near term, we are pursuing a commercialization strategy with multiple options. We intend to internally develop and commercialize some product candidates where we believe the clinical trials and sales force requirements are manageable. We intend to partner with other companies to co-develop and co-promote product candidates in cases where we do not have access to the infrastructure required for development and commercialization. Finally, we intend to out-license other product candidates and intellectual property that do not fit within our future commercial focus. 
      We intend to develop our own manufacturing capabilities in the future, but in the near term we expect to use third-party manufacturers. We have initiated the design phase for a pilot manufacturing plant, which we intend to use as a source of clinical product supply. We plan to subsequently develop larger-scale commercial manufacturing facilities as our products progress through clinical development. 
Research and Development 
      We have discovered a large collection of novel genes with our signature-by-hybridization platform. Since 1997 we have used our signature-by-hybridization platform to discover genes expressed in a large number of complementary DNA (or cDNA) libraries derived from specific human cells and tissues. These cDNA libraries are spotted onto replica filters which are then hybridized independently with short, distinct DNA probes. After repeated probing, each cDNA develops a characteristic hybridization signature that can be used to group similar clones into clusters. By sequencing only representative cDNAs from each cluster, we have allowed for an efficient and thorough analysis of all genes expressed in any library. Using bioinformatics and biological screening methods, gene sequences are analyzed to select molecules for pre-clinincal testing. In addition, the use of EST data together with genomic sequence data affords us the opportunity to identify those rare genes that otherwise might go undetected using only EST databases. Genes that are expressed only at low levels are typically underrepresented in or absent from public EST databases. These rarely expressed genes may have potent biological activities with clinical utility. 
      We conduct high-throughput gene sequence analysis using advanced informatics tools and protein structure modeling techniques to identify candidate genes for biological screening. In general, most candidates are grouped into the broad categories of potential protein therapeutics and small molecule or antibody targets. We believe genes with sequence characteristics and motifs similar to those found in known secreted proteins are more likely to be useful as protein therapeutics and those with characteristics of membrane or intracellular proteins are more likely to serve as targets for antibodies and small molecules. Our focus has been on development of molecules that we believe will result in protein therapeutics. We plan to pursue targets for antibodies and small molecules through strategic relationships. 
      We use a diverse set of tools to evaluate the biological functions of the genes and proteins we discover. In our collaboration with Kirin Brewery Company, Ltd., we conduct screens in which the gene of interest has 
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been introduced into genetically modified mice (transgenic mice) such that the encoded human protein is expressed in the adult animal. Through our collaboration with Deltagen Inc., we can identify the function of our genes by developing knockout mice, in which the corresponding mouse gene has been inactivated by genetic manipulation. We use dozens of independent assays to investigate the biological and biochemical activities of our novel proteins. To obtain additional information, our scientists have adapted or created in vivo laboratory models that mimic human diseases to determine the cause of disease and response to treatment. For certain ligands, we clone the receptors for the ligand present in a tissue or cell. In addition to providing a marker for tissues that should respond to the protein, the receptors themselves can have therapeutic potential. We also rely on an external network of collaborators to investigate biology and conduct additional tests that we do not perform in-house. 
      Within our exploratory biology operation, we apply a variety of methods by which we can identify a protein’s function, determine whether the protein plays a role in disease, assess its commercial potential, and obtain information about dosing and systemic effects of the product candidate. Assuming positive results, both in terms of efficacy and toxicology, we may develop a commercial hypothesis for the product candidate. A commercial hypothesis requires the identification of a market opportunity and a preliminary determination that it will be economically feasible to manufacture the product candidate and administer it to patients. 
      The process of selecting and evaluating drug candidates involves a broad range of skills and a highly trained scientific staff. Following the initial gene assessment by our bioinformatics group, full-length genes are obtained, expressed, and screened for biological activity by our cloning and cell screening groups. Once activities have been identified, additional experiments are performed to support the development of a biological hypothesis that describes the protein’s function. The protein candidate next moves to the validation stage, in which more directed and focused experiments are performed to confirm the biological activity and to establish a medical hypothesis. Molecules showing biological activity and molecules with sequence or structural homology to known proteins are further evaluated by our functional genomics group. Our protein production and purification group is responsible for providing larger quantities of selected proteins for further in vitro and in vivo testing. These tests are conducted by our functional genomics group, working in conjunction with contract research organizations and university collaborators. Throughout this process, information is provided to our legal group to pursue patent protection for our candidates. In cases where a protein demonstrates beneficial biological effects, it becomes a product candidate. If a protein has been found to have detrimental effects, we will focus on generating a monoclonal antibody or soluble receptor to inhibit the activity of the protein. In those cases, a resulting monoclonal antibody or soluble receptor will be the product candidate. Once a product candidate is identified, it moves to the pre-clinical stage, at which time it is tested in specific animal models of diseases for safety and pharmacokinetic analysis. Following initial safety and pharmacokinetic analysis, the pre-clinical safety and efficacy group will be responsible for working with contract research organizations to conduct GLP toxicology and other studies required for filing an IND. Until adequate staff and facilities are established in-house, we plan to use contract organizations for the production of cGMP drug and for conducting clinical trials on our lead therapeutic protein candidates. 

	Alfimeprase: Product Candidate for Clot Lysis	
      Alfimeprase is a thrombolytic agent, that is, it dissolves blood clots. Developed by Amgen, Inc., it is a novel recombinant form of fibrolase, a naturally occurring enzyme. Unlike plasminogen activators, alfimeprase can directly and rapidly degrade the network of fibrin protein that captures red blood cells to form blood clots. The first target medical indication is Peripheral Arterial Occlusion (or PAO). In PAO, a clot blocks blood flow to a distant body part, usually in the leg. It is estimated that more than 100,000 cases of PAO are reported in the United States per year. An IND has been filed in the PAO indication. We plan to begin Phase 1 human studies in the second quarter of 2002. 
      To date none of our other therapeutic protein product candidates has progressed beyond pre-clinical testing, aside from alfimeprase. Recently, we have refocused our efforts from previously identified pre-clinical stage product candidates, IL1Hy1 and CD39L4, to other more promising pre-clinical candidates, the results of testing to date may not be indicative of results that will be obtained in further pre-clinical studies or in clinical trials. However, as we have not begun human testing of alfimeprase or any other product candidates, human 
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clinical results could be different from our expectations following our pre-clinical studies. Consequently, there is no assurance that the results in our pre-clinical testing are predictive of the results that we will see in our clinical trials with humans. As further results of tests are received, we may abandon or reduce our efforts regarding particular projects. Additionally, there can be no assurance that clinical trials as to any particular product candidate, if commenced, will be successful, that the proposed disease indication will prove true, or that any product can be successfully commercialized. See “Risk Factors — Development of Our Products Will Take Years; Our Products Will Require Approval Before They Can Be Sold” and “Risk Factors — The Success of Our Potential Products in Preclinical Studies Does Not Guarantee that these Results Will Be Replicated in Humans.” 
Intellectual Property 
      We seek patent protection on isolated partial and full-length gene sequences, as well as their encoded protein products, antibodies that bind to these proteins, and methods of using these genes, proteins or antibodies. As of March 15, 2002, we had filed patent applications on approximately 10,000 full-length gene sequences and their corresponding proteins and antibodies. Subsequent bioinformatics analyses of our proprietary collection indicate that these putative full-length gene sequences represent approximately 10,000 different genes. We have also filed patent applications on more than 830,000 partial gene sequences. We hold five United States patents relating to our proprietary gene sequences with claims covering the genes, their encoded protein products, corresponding antibodies, or methods of use. 
      Our subsidiary Callida Genomics, Inc. holds nineteen United States patents with claims covering the methods, compositions, apparatus and applications relating to sequencing-by-hybridization technology. We have filed several additional patent applications covering improvements to and new applications of the SBH technology. 
      Our success will depend in large part on our ability to: obtain patent and other proprietary protection for genes and proteins we discover; defend patents once obtained; operate without infringing the patents and proprietary rights of third parties; and preserve our trade secrets. 
Research and Development Collaborations 
      We and our subsidiary Callida are focusing on strategic relationships to share research and development efforts and marketing opportunities with other biotechnology and pharmaceutical companies. We recognize external collaborations as an important aspect of our success in analyzing and characterizing protein function. Our current collaborations include research and development collaborations with Aurora Biosciences Corporation, Deltagen, Inc., and Kirin Brewery Co., Ltd., gene discovery collaborations with BASF Plant Sciences GmbH (or BASF), and Chiron Corporation and a collaboration with the University of California, San Francisco (or UCSF) to conduct research on genes that may have important roles in the development of cardiovascular and related diseases. We had a previous collaboration with Kirin that was completed in March 2001. Our subsidiary Callida also has a collaboration with Affymetrix, Inc. and has been assigned our previous collaboration with the Applied Biosystems Group of Applera Corporation to commercialize one application of our SBH technology. 

	Aurora	
      In July 2001, we entered into a two-year collaboration and license agreement with Aurora Biosciences Corporation, under which Aurora will screen over 200 secreted proteins from our proprietary collection, using Aurora’s proprietary CellSensorTM Panel, and under which we received a non-exclusive license to certain fluorescent protein technologies. Aurora will use its technology on our behalf to identify proteins of interest as potential therapeutics and will receive upfront payments, licensing fees and technology access fees. Aurora may receive performance milestones, as well as development milestones and royalties on our products that result from the collaboration. In addition, as part of the agreement, we will provide Aurora access to selected novel targets from our database of proprietary full-length cDNAs. We will receive a database access fee and 
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licensing fees and may receive development milestones and royalties on Aurora’s small molecule products that result from the collaboration. 

	Deltagen	
      In October 2001, we entered into a collaboration with Deltagen to undertake research and development activities on approximately 200 novel secreted proteins. We will provide gene sequences encoding for the secreted proteins, and Deltagen will utilize its in vivo mammalian gene knockout technology to identify and validate potential commercially relevant biopharmaceutical drug targets. Both companies will have certain joint development and commercialization rights around potential biopharmaceutical drug targets discovered through the collaboration. The cost of the collaboration will be shared with Deltagen; we will provide Deltagen with approximately $10 million in research and development payments over two years. 

	Kirin	
      In October 1998, we entered into a collaboration with Kirin in which we use our signature-by-hybridization platform to target potential pharmaceutical candidates involved in cell growth regulation from specific cell lines provided by Kirin. During the fourth quarter of 2000, we extended the term of our collaboration with Kirin through March 2001 in order to complete additional research. We retain rights in North America to develop pharmaceutical products resulting from the collaboration, subject to milestone and royalty payments to Kirin. Kirin has equivalent rights in Asia and Oceania, and we share rights equally in Europe and in the rest of the world. Our gene sequencing obligations under the original term of the agreement are substantially complete. 
      In August 2001, we entered into a new collaboration with Kirin, in which Kirin will fund three years of our collaborative research work and both companies will conduct research directed toward discovering proteins and antibodies for a variety of diseases, including hematopoietic and inflammatory diseases. We will jointly own discoveries made during the collaboration, and we will jointly develop and market the resulting products while sharing costs, efforts, and revenues. We will have marketing rights in North America on all products discovered and developed under the collaboration. Kirin will have marketing rights in Asia and Ocenia. We will share marketing rights equally in Europe and the rest of the world. 
      Revenues from our collaborations with Kirin represented 19% of total revenue for fiscal year ended December 31, 1999, and less than 10% of total revenue for fiscal years ended December 31, 2000 and 2001. 

	BASF	
      In December 1999, we entered into a collaboration with American Cyanamid Company in which we use our signature-by-hybridization platform to target potential agricultural products. During 2000, BASF Aktiengesellschaft acquired the crop protection business of American Cyanamid Company and subsequently assigned our collaboration with American Cyanamid to BASF Plant Sciences GmbH. The collaboration provides for funding of $60 million over its initial term of three and one half years. The collaboration can be extended by mutual agreement, for up to four additional one-year terms. BASF has the exclusive right to commercialize any agricultural products resulting from the collaboration. We will receive royalties on any such products. The agreement requires us to generate data at a specified level per year which, if not met, could result in our breach of the agreement. Revenues from our collaboration with BASF represented less than 10% of total revenue for fiscal year ended December 31, 1999, 75% of total revenue for fiscal year ended December 31, 2000, and 91% of total revenue for fiscal year ended December 31, 2001. 

	Chiron	
      In May 1997, we entered into a collaboration with Chiron in which we used our signature-by-hybridization platform to target solid tumor cancer therapeutics, diagnostic molecules and vaccines. The collaboration had an initial term of three years ending in May 2000, and has been extended by Chiron for an additional two-year period ending in May 2002. At its option, Chiron may extend the collaboration for one more two-year period before the current extension ends in May 2002. Our gene sequencing obligations under 
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the original term of the agreement are substantially completed. Chiron has the exclusive right to commercialize any solid tumor products resulting from the collaboration. We will receive royalties on any such products. In addition to research funding payments, in 1997 Chiron made an equity investment in us of $7.5 million in conjunction with the collaboration. Revenues from our collaboration with Chiron represented 76% of total revenue for fiscal year ended December 31, 1999, 21% of total revenue for fiscal year ended December 31, 2000, and less than 10% of total revenue for fiscal year ended December 31, 2001. 

	University of California, San Francisco	
      In February 1998, we entered into an agreement with UCSF to conduct research on genes that may have important roles in the development of cardiovascular and related diseases. Under the agreement, researchers at UCSF are collecting DNA samples from up to 20,000 genetically diverse individuals. We can use these DNA samples to identify genetic traits related to heart disease and hypertension. 

	Applied Biosystems	
      In May 1997, we entered into an agreement with Applied Biosystems to commercialize HyChip products. Pursuant to this agreement, we were required to commit $5.0 million to further development of the chip component of the HyChip system, which we satisfied in 1998. Applied Biosystems was also required to commit certain funds for development of the overall system. The collaboration had an initial term of five years and is extended automatically thereafter unless the parties mutually agree to termination. The agreement required us to design, develop and manufacture the HyChip chip component, while Applied Biosystems was responsible for the design, development and manufacture of the system that processes and analyzes data from the HyChip chip, as well as marketing and customer support. In 1997, Applied Biosystems made an equity investment in us of $10.0 million in conjunction with the collaboration. 
      In October 2001, we amended our agreement with Applied Biosystems to facilitate the settlement with Affymetrix. Significant components of this amendment included the conversion of the prior exclusive marketing arrangement with Applied Biosystems into a non-exclusive arrangement and the conclusion of all further collaboration obligations for each company. This collaboration agreement and amendment were assigned to our subsidiary Callida Genomics, Inc. (“Callida”) in October 2001. 

	Affymetrix	
      In October 2001, incident to our settlement of all outstanding litigation with Affymetrix, we entered into a collaboration with Affymetrix to accelerate development and commercialization of a high speed universal DNA sequencing chip. This collaboration with Affymetrix is through a newly created venture, N-Mer, Inc., that is a wholly owned subsidiary of Callida, which in turn is a newly formed majority-owned subsidiary of ours. Universal chips, or arrays, are DNA arrays designed without reference to specific gene sequences that can be used to sequence any gene sequence. N-Mer will have access to both our sequencing-by-hybridization (SBH) technology, through Callida, and to Affymetrix’ GeneChip technology, a standard platform for array-based experiments. Affymetrix will be the exclusive array and system supplier and is initially authorized to be the exclusive agent for the distribution of N-Mer products. 
Our Subsidiary Callida Genomics, Inc. 
      In October 2001, we formed a new majority-owned subsidiary, Callida Genomics, Inc., to carry out the Company’s business relating to our proprietary SBH technology. At the same time, Callida formed a wholly owned subsidiary, N-Mer, Inc. to collaborate with Affymetrix, Inc. on developing and commercializing a high speed DNA sequencing chip. Affymetrix has an initial 10% equity interest in Callida which may increase or decrease upon further third party financing of Callida. We and Affymetrix have agreed to each make additional investments in Callida, which will be conditioned on N-Mer’s attainment of a specified technical milestone and the procurement of third-party financing. Callida granted Affymetrix an option to purchase a majority interest in N-Mer, which will be exercisable at any time over the next five years. 
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      We contributed all of our SBH patents and patent applications to Callida. A team of approximately 30 Hyseq scientists, including one of our founders, Dr. Radoje Drmanac, who pioneered our DNA chip and SBH technology, are now full-time employees of Callida. Our Chairman Dr. George Rathmann will also serve as Chairman, Interim President and Chief Executive Officer of Callida. As of March 15, 2002, HySeq has a 90% equity position in Callida. 
      SBH technology generally involves using DNA probes of known sequence that are hybridized with DNA samples. Different probe sets can be used for different applications. We use a complete set of probes of a given length, or a subset of probes that are selected based on statistical properties, to assemble an unknown sequence of a DNA sample. DNA analysis applications using complete sets or subsets of probes include de novo sequencing, resequencing, genotyping, mutation discovery, and polymorphism detection. In addition, we have a proprietary signature-by-hybridization technology in which we use a small set of probes to screen for and discover genes in a large number of DNA samples. 
     Licensed Technology 
      In 1994, we acquired an exclusive license from Arch Development Corporation, a not-for-profit corporation affiliated with the University of Chicago that manages Argonne National Laboratories, to develop further and use certain SBH improvements developed by one of our chief scientists while he was at Argonne. In July 1997, we began paying minimum royalties as required under the exclusive license. This license agreement was assigned to our subsidiary Callida in October 2001. 
Patents and Trade Secrets 
      The U.S. Patent and Trademark Office and patent authorities outside the United States issue patents for inventions based on genes that have been isolated from their natural state (through a purifying step that separates the gene from other molecules naturally associated with it), but only if the invention meets all the criteria for a patent. Each country has its own standards for granting a patent. In the United States, to be eligible for patent protection, an invention must at least be novel and useful and the patent application must contain sufficient detail to allow one skilled in the art or technology to reproduce the invention. We apply for patent applications on both partial and full-length gene sequences. As of March 15, 2002, we had filed patent applications on approximately 10,000 full-length gene sequences and their corresponding proteins. Fewer than 10,000 applications are pending because some of our patent applications include many gene sequences in one application. These applications may or may not result in the issuance of patents. In January 2001, the U.S. Patent and Trademark Office issued final revised guidelines on the standard of utility required for inventions, including gene-based inventions. The revised guidelines state that a patent application for an invention must disclose a well-established utility or a specific, substantial and credible utility for the isolated and purified gene. There can be no assurance that our disclosures in these applications are sufficient to meet the statutory requirements for patentability in all cases. We cannot assure you that any of our currently pending or future applications will issue as patents, or that any patent issued to us will not be challenged, invalidated, circumvented or held unenforceable by way of an interference proceeding or litigation. 
      Patent protection for therapeutic protein-based products can include coverage of the composition of matter of a gene and the protein it expresses, methods to generate or manufacture the products and methods of using the products. Prior to the genomics era, there were few patents filed each year that contained DNA sequence information. The development of methods for rapid DNA sequencing and bioinformatics techniques has driven significant growth in the number of patent applications filed on genes and their corresponding proteins. 
      In part, the filing of so many patents on DNA sequences reflects the importance of patent protection for therapeutic protein-based products. The costs of developing these products can run into the hundreds of millions of dollars and can take up to 10 to 12 years from experimental stage to market. Without patent protection, companies often have little incentive to invest in this important endeavor. Protection through patent exclusivity provides the opportunity for a company to recoup its research and development costs, make 
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a profit on the therapeutic protein-based product, and invest in research and development of additional therapeutic protein-based products. 
      The growth in the number of patents filed on DNA sequences has spurred continuing reassessment of the related patenting process. Beginning in the early 1990s, many companies filed patent applications primarily covering ESTs or other partial gene sequences, believing that resulting patents would cover the related full-length gene sequences. In the mid-1990s, it became increasingly evident that applications filed with the United States Patent and Trademark Office would need to cover full-length gene sequences to result in broad patent protection. More recently, the Patent and Trademark Office has published guidelines regarding utility of patented gene sequences. These guidelines suggest that many existing patent applications with inadequate utility disclosure may not result in issued patents, even if the applications cover full-length gene sequences. Patents on methods of use for proteins may become more important as more information becomes available about the therapeutic significance of discovered genes and proteins. 
      We have also filed United States patent applications on more than 830,000 partial human gene sequences. There can be no assurance that the disclosures in these applications are sufficient to meet the statutory requirements for patentability. Where only a partial sequence is disclosed, the U.S. Patent and Trademark Office may issue patents of a very limited scope that will not cover a full-length gene sequence that includes the partial sequence. Therefore, there is a significant risk that the U.S. Patent and Trademark Office will not issue patents based on patent disclosures limited to partial gene sequences or will issue patents of a very limited scope. The commercial protection provided by any patents issued on the basis of partial gene sequences is uncertain. 
      Other companies or institutions may have filed patent applications, or may file patent applications in the future, which attempt to patent genes similar to or the same as those covered in our patent applications, including applications based on our potential products. The U.S. Patent and Trademark Office would decide the priority of competing patent claims in an interference proceeding. Any patent application filed by a third party may have priority over a patent application we filed, in which event such third party may require us to stop pursuing a potential product, or negotiate a royalty arrangement to pursue and commercialize the potential product. 
      Issued patents may not provide freedom to operate with respect to our potential products because certain uses of our potential products may give rise to claims that such uses infringe the patents of others. This risk will increase as the biotechnology industry expands and as other companies obtain more patents and attempt to discover the utility and function of all known genes. Other persons could bring legal actions against us to claim damages or to stop our manufacturing and marketing of the affected products. If any of these actions are successful, in addition to any potential liability for past damages, these persons may require us to obtain a license in order to continue to manufacture or market the affected products. We believe that there will continue to be significant litigation in our industry regarding patent and other intellectual property rights. If we become involved in patent litigation related to our technology or potential products, it could consume a substantial portion of our resources. 
      We pursue patent protection for products and processes where appropriate and we also rely on trade secrets, know-how and continuing technological advancement to develop and maintain our competitive position. Our policy is to have each employee enter into an agreement that contains provisions prohibiting the disclosure of confidential information to anyone outside the company. Research and development contracts and relationships between us and our scientific consultants provide access to aspects of our know-how that is protected generally under confidentiality agreements with the parties involved. There can be no assurance, however, that these confidentiality agreements will be honored or that we can effectively protect our rights to our unpatented trade secrets. Moreover, there can be no assurance that others will not independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our trade secrets. 
Competition 
      Our strategy as a biopharmaceutical company is to define and patent human genes that are most likely to be involved in a disease condition and to focus on identifying product candidates from the proteins produced 
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by these genes. There are a finite number of genes in the human genome, virtually all of which have been or will soon be identified. Other active companies include major pharmaceutical and biotechnology firms, not-for-profit entities and United States and foreign government-financed programs, many of which have substantially greater research and product development capabilities and financial, scientific, marketing and human resources than we do. As a result, they may succeed in identifying genes and determining their functions or developing products earlier than we or our current or future collaboration partners do. They also may obtain patents and regulatory approvals for such products more rapidly than we or our current or future collaboration partners, or develop products that are more effective than those proposed to be developed by us or our collaboration partners. Further, any potential products based on genes we identify ultimately will face competition from other companies developing gene-based products as well as from companies developing other forms of treatment for diseases which may be caused by, or related to, the genes we identify. There can be no assurance that research and development by others will not render the products that we may develop obsolete or uneconomical or result in treatments, cures or diagnostics superior to any therapy or diagnostic developed by us or that any therapy we develop will be preferred to any existing or newly developed technologies. Certain of our collaboration partners may now be, or could become, competitors. 
      We are in a competition to identify, establish uses for and patent as many genes and their corresponding proteins as possible and to commercialize the products we develop from these genes and proteins. We face competition from other entities using high-speed gene sequencers and other sophisticated bioinformatics technologies to discover genes, including but not limited to Celera Genomics Corporation, Curagen, Inc., Genentech, Inc., Human Genome Sciences, Inc., Incyte Genomics, Inc., Millennium Pharmaceuticals, Inc., and Zymogenetics, Inc. We also face competition from entities using more traditional methods to discover genes related to particular diseases, including other large biotechnology and pharmaceutical companies. We expect that competition in our field will continue to be intense. Research to identify genes is also being conducted by various institutes and government-financed entities in the United States and in foreign countries, including France, Germany, Japan and the United Kingdom and elsewhere, as well as by numerous smaller laboratories associated with universities or other not-for-profit entities. In addition, a number of pharmaceutical and biotechnology companies and government-financed programs are engaged or have announced their intention to engage in areas of human genome research similar to or competitive with our focus on gene discovery, and other entities are likely to enter the field. 
      We believe the principal competitive factors affecting our markets are rights to develop and commercialize therapeutic protein-based products, including appropriate patent and proprietary rights; safety and effectiveness of therapeutic protein-based products; the timing and scope of regulatory approvals; the cost and availability of these products; the availability of appropriate third-party reimbursement programs; and the availability of alternative therapeutic products or treatments. Although we believe that we are well positioned to compete adequately with respect to these factors in the future, our future success is currently difficult to predict because we are an early stage company; all of our internal product candidates are still in various stages of pre-clinical development and have yet to undergo clinical trials. Also, although we believe that our bioinformatics technologies and exploratory biology capabilities provide us with a competitive advantage, any of the companies or other entities we compete with may discover and establish a superior patent position in one or more genes or proteins that we have identified and designated or considered designating as a product candidate. In addition, any potential products based on genes or proteins we identify will face competition both from companies developing gene- or protein-based products and from companies developing other forms of treatment for diseases that may be caused by, or related to, the genes or proteins we identify. Furthermore, our potential products, if approved and commercialized, may compete against well established existing therapeutic protein-based products, many of which may be currently reimbursed by government health administration authorities, private health insurers and health maintenance organizations. Also, healthcare professionals and consumers may prefer existing or newly developed products to any product we develop. 
      Although we believe that there are significant product development opportunities for both us and for our collaborators, competition exists to develop and commercialize therapeutic protein-based products. Many of our existing and potential competitors have substantially greater research and product development capabilities and financial, scientific, marketing and human resources than we do. As a result, these competitors 
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may: succeed in identifying genes or proteins, or developing therapeutic protein-based products, earlier than we do; obtain approvals for products from the FDA or other regulatory agencies more rapidly than we do; obtain patents that block or otherwise inhibit our ability to develop and commercialize our product candidates; develop treatments or cures that are safer or more effective than those we propose to develop; devote greater resources to marketing or selling their products; introduce or adapt more quickly to new technologies or scientific advances, which could render our high throughput technologies obsolete; introduce products that make the continued development of our potential products uneconomical; more effectively negotiate third-party collaborative or licensing arrangements; and take advantage of acquisition or other opportunities more readily than we can. 
      With regard to our subsidiary, Callida, competition in the area of DNA analysis tools is intense and expected to increase. Technologies in this area are new and rapidly evolving. Applications of Callida’s SBH technology compete primarily with Affymetrix and Applied Biosystems. Applied Biosystems presently markets gel sequencers, a well-established sequencing technology, which compete with applications of SBH technology. Other companies also are developing or have developed DNA analysis tools that may compete with applications of SBH technology, including Aclara Biosciences, Inc., Agilent Technologies, Inc., Caliper Technologies, Inc., CuraGen, Inc., IBM, Illumina, Inc., Molecular Devices, Nanogen, Inc., and Sequenom, Inc. Many of these companies have significantly greater research and development, marketing and financial resources than we do, and therefore represent significant competition. 
Government Regulation 
      Regulation by governmental authorities in the United States and most foreign countries will be a significant factor in manufacturing and marketing our potential products and in our ongoing research and product development activities. Virtually all of our products and those of our partners, such as Amgen, Aurora Biosciences, Chiron, Deltagen and Kirin, will require regulatory approval by governmental agencies prior to commercialization. In particular, human therapeutic products are subject to rigorous preclinical and clinical testing and other approval requirements by the FDA and comparable agencies in foreign countries. We are currently collaborating with Amgen to develop alfimeprase, which is a drug candidate that will require regulatory approval. The collaboration is further described in note 12, “Subsequent Events,” to the financial statements included in this Annual Report on Form 10-K. The time required for completing such testing and obtaining such approvals is uncertain. Unexpected biological activities, some of which may result in safety issues, may arise during preclinical evaluation. Such observations could delay or alter the course of a development program or ultimately result in the termination of a program. Any delay in clinical testing may also delay product development. In addition, delays or rejections may be encountered based on changes in FDA or foreign regulatory policy during the period of product development and testing. Various federal statutes and regulations also regulate the manufacturing, safety, labeling, storage, record-keeping and marketing of such products. The lengthy process of obtaining regulatory approvals and ensuring compliance with appropriate federal statutes and regulations requires the expenditure of substantial resources. Any delay or failure by us or by our collaboration partners to obtain regulatory approval could adversely affect the commercialization of products we or they are developing, our ability to achieve product collaboration milestones or receive royalty revenue and thus negatively impact our liquidity and capital resources. 
      Preclinical studies are generally conducted in the laboratory to evaluate the potential efficacy and safety of a therapeutic product. The results of these studies are submitted to the FDA as part of an Investigational New Drug application (IND), which must be reviewed by FDA personnel before clinical testing can begin. Typically, clinical evaluation involves three sequential phases, which may overlap. During Phase I, clinical trials are conducted with a relatively small number of subjects to determine the early safety profile of a drug, as well as the pattern of drug distribution and drug metabolism. In Phase II, trials are conducted with groups of patients afflicted by a specific target disease to determine preliminary efficacy, optimal dosages, and dosage tolerance and to gather additional safety data. In Phase III, larger-scale, multi-center comparative trials are conducted with patients afflicted with a specific target disease to provide data for the statistical proof of efficacy and safety as required by the FDA and foreign regulatory agencies. The FDA, the clinical trial sponsor or the investigator may suspend clinical trials at any time if they believe that clinical subjects are being 
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exposed to an unacceptable health risk. Although the IND has been filed for alfimeprase, we may change the clinical study design, which may require further review by the FDA. Once we begin Phase I clinical studies, there is no assurance that the safety profile of alfimeprase will be acceptable and that it will proceed to Phase II or Phase III. 
      The results of preclinical and clinical testing are submitted to the FDA in the form of a New Drug Application for small molecule products or a Biologic License Application for biological products. In responding to New Drug Application or Biologic License Application it may grant marketing approval, request additional information, or deny the application if the FDA determines that the application does not satisfy its regulatory approval criteria. There can be no assurance that approvals will be granted on a timely basis, if at all. The failure to obtain timely permission for clinical testing or timely approval for product marketing would have a material negative effect on us. Product approvals may subsequently be withdrawn if compliance with regulatory standards is not maintained or if problems are identified after the product reaches the market. The FDA may require testing and surveillance programs to monitor the effect of a new product and may prevent or limit future marketing of the product based on the results of these post-marketing programs. 
      Currently one of our product candidates, Alfimeprase qualifies as an orphan drug under the Orphan Drug Act of 1983. This act generally provides incentives to manufacturers to undertake development and marketing of products to treat relatively rare diseases or those diseases that affect fewer than 200,000 persons annually in the United States. A drug that receives orphan drug designation by the FDA and is the first product to receive FDA marketing approval for its product claim is entitled to various advantages, including a seven-year exclusive marketing period in the United States for that product claim. However, any drug that is considered by the FDA to be different from or clinically superior to a particular orphan drug, including any orphan drug of ours that has been so designated by the FDA, will not be precluded from sale in the United States during the seven-year exclusive marketing period. We cannot assure you that any of our other product candidates will be designated as an orphan drug by the FDA or, if so designated, will have a positive effect on our revenues. 
      To manufacture our potential products, a domestic or foreign drug manufacturing facility must be registered with the FDA as a manufacturing establishment, must submit to periodic inspection by the FDA and must comply with current Good Manufacturing Practices regulations. In addition, the FDA imposes a number of complex regulations on entities that advertise and promote biologics, including, among others, standards and regulations for direct-to-consumer advertising, off-label promotions, industry-sponsored scientific and educational activities, and promotional activities involving the Internet. The FDA has very broad enforcement authority under the Federal Food, Drug and Cosmetic Act, and failure to abide by these regulations can result in penalties, including the issuance of a warning letter directing us to correct deviations from FDA standards, a requirement that future advertising and promotional materials be pre-cleared by the FDA, and civil and criminal penalties. 
      Whether or not FDA approval has been obtained, approval of a product by comparable foreign regulatory authorities is necessary prior to the commencement of marketing of a product in those countries. The approval procedures vary among countries and can involve additional testing. The time required to obtain approval may differ from that required for FDA approval. Although there are some centralized procedures for filings in the European Union countries, in general each country has its own procedures and requirements, and compliance with these procedures and requirements may be expensive and time-consuming. Accordingly, there may be substantial delays in obtaining required approvals from foreign regulatory authorities after the relevant applications are filed, if we ultimately receive any approvals at all. 
      Even if regulatory approval for a product is obtained, the product and the facilities manufacturing the product are subject to continued review and periodic inspection. Each drug-manufacturing establishment in the United States must be registered with the FDA. Domestic manufacturing establishments are subject to biannual inspections by the FDA and must comply with the FDA’s cGMP regulations, as well as regulatory agencies in other countries if products are sold outside the United States. If our subsidiary Callida manufactures for sale to third parties diagnostic product applications of its SBH technology, it will need to comply with cGMP regulations pertaining to devices. We will need to spend funds, time and effort to ensure full technical compliance with these regulations. The FDA stringently applies regulatory standards for 
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manufacturing drugs, biologics, and medical devices. The FDA’s cGMP regulations require that drugs and medical devices be manufactured and records be maintained in a prescribed manner with respect to manufacturing, testing and control activities. 
      Our policy is to conduct research activities in compliance with the National Institute of Health Guidelines for Research Involving Recombinant DNA Molecules. We also are subject to various federal, state and local laws, regulations and recommendations relating to safe working conditions, laboratory and manufacturing practices, the experimental use of animals and the use and disposal of hazardous or potentially hazardous substances, including radioactive compounds and infectious disease agents, used in connection with our work. The extent and character of governmental regulation that might result from future legislation or administrative action and its effect on us cannot be accurately predicted. 
      We are subject to federal, state and local laws and regulations governing the use, storage, handling and disposal of hazardous materials, including 33P, a low energy radioactive isotope used in labeling some of our probes and subsequently present in certain waste products. Although we believe that our safety procedures for such materials comply with the standards prescribed by local, state, and federal laws and regulations, the risk of accidental contamination or injury from these materials cannot be completely eliminated. In the event of such an accident, we could be held liable for any damages that result and any liability could exceed our resources. 
Human Resources 
      At December 31, 2001, we had 224 full-time equivalent employees including Callida employees, 92 of whom hold Ph.D., M.D., J.D., or other advanced degrees. Approximately 186 of our employees are engaged in research and development activities, including 29 in Callida Genomics, and approximately 38 are engaged in business development, finance, operations support, and administration. None of our employees are represented by a collective bargaining agreement, nor have we experienced work stoppages. We believe that relations with our employees are good. 
Risk Factors 
     We Must Be Able to Continue to Secure Additional Financing 
      Our business does not currently generate the cash needed to finance our operations. We will require substantial additional financial resources to conduct the time-consuming and costly research, preclinical development, clinical trials and regulatory approval and marketing activities necessary to commercialize our potential biopharmaceutical products. Also, in pursuing our goal of building a fully integrated biopharmaceutical company, we will need to expand our facilities and hire and train significant numbers of employees to staff these facilities, which will require substantial additional funds. We will need to secure additional financing in order to conduct our research and expand our facilities. However, unanticipated expenses, or unanticipated opportunities that require financial commitments, could give rise to requirements for additional financing sooner than we expect. Financing may be unavailable when we need it or may not be available on acceptable terms. The unavailability of financing may require us to delay, scale back, or eliminate expenditures for our research and development program or our facilities expansion plans. We may also be required to grant rights to third parties to develop and market product candidates that we would prefer to develop and market ourselves. If we were required to grant such rights, the ultimate value of these product candidates to us would be reduced. 
      We intend to seek additional funding through collaborations and public or private equity or debt financings. We have financed our operations since inception primarily through the sale of equity securities, and revenue from corporate collaborations. We have not generated royalty revenues from product sales, and do not expect to receive significant revenues from royalties in the foreseeable future, if ever. 
      To execute an operating plan that includes facilities expansion and additional staffing, we will need to secure additional financing. Additional financing, however, may not be available on acceptable terms, if at all. For approximately the past eighteen months, the capital markets have been volatile and uncertain. Given the 
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current state of the markets for public and private offerings of securities, we may have difficulty raising the amount of funds, on reasonable terms, necessary to finance our current operating plan. We have implemented a plan to delay, and scale back some of our operating expenditures, including facilities expansion plans, until we obtain additional funding. This plan includes a hiring freeze, a freeze on capital expenditures and a deferral of as many of our contractual financial commitments as possible. If we are unable to obtain additional financing, we may need to look to our Chairman to provide financing, which he has agreed to do. The planned reduction in operating expenditures may have a negative effect on our business. In addition, the perception in the capital markets that we may not be able to raise the amount of financing we desire, or on terms favorable to us, may have a negative effect on the trading price of our stock. Additional equity financings could result in significant dilution of current stockholders’ equity interests. If sufficient capital is not available, we will delay, reduce the scope of, eliminate or divest one or more of our subsidiaries, discovery, research or development programs or our facilities expansion. Any such action could significantly harm our business, financial condition and results of operations. 
      Our future capital requirements and the adequacy of our currently available funds will depend on many factors, including, among others, the following: 
			
 	• 	continued scientific progress in our research and development programs, including progress in our research and preclinical studies on our potential therapeutic protein candidates; 	
 		
 	• 	the cost involved in our facilities expansion to support research and development of our potential therapeutic protein candidates; 	
 		
 	• 	our ability and the ability of our subsidiary Callida to attract additional financing on favorable terms; 	
 		
 	• 	the magnitude and scope of our research and development programs, including development of potential therapeutic protein candidates and Callida technology and applications; 	
 		
 	• 	our ability to maintain, and the financial commitments involved in, our existing collaborative and licensing arrangements; 	
 		
 	• 	our ability to establish new corporate relationships with other biotechnology and pharmaceutical companies to share costs and expertise of identifying and developing product candidates; 	
 		
 	• 	the cost of prosecuting and enforcing our intellectual property rights; 	
 		
 	• 	the cost of manufacturing material for preclinical, clinical and commercial purposes; 	
 		
 	• 	progress in our clinical studies of alfimeprase; 	
 		
 	• 	the time and cost involved in obtaining regulatory approvals; 	
 		
 	• 	our need to develop, acquire or license new technologies or products; 	
 		
 	• 	competing technological and market developments; 	
 		
 	• 	future funding commitments to our subsidiary Callida, and our ability to borrow funds from Affymetrix to fund our commitment, under the terms of the Affymetrix settlement; 	
 		
 	• 	our ability to use our common stock to repay our outstanding note to Affymetrix and our line of credit with our Chairman; 	
 		
 	• 	legal and Nasdaq restrictions that impede our ability to raise funds from private placements of our common stock; 	
 		
 	• 	future funding commitments to our collaborators; 	
 		
 	• 	general conditions in the financial markets and in the biotech sector; 	
 		
 	• 	the uncertain condition of the capital markets; and 	
 		
 	• 	other factors not within our control. 	
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     	Development of Our Products Will Take Years; Our Products Will Require Approval Before They Can Be Sold	
      Because substantially all of our potential products currently are in research or preclinical development, revenues from sales of any products will not occur for at least the next several years, if at all. We cannot be certain that any of our products will be safe and effective or that we will obtain regulatory approvals. In addition, any products that we develop may not be economical to manufacture on a commercial scale. Even if we develop a product that becomes available for commercial sale, we cannot be certain that consumers will accept the product. We cannot predict whether we will be able to develop and commercialize any of our protein candidates successfully. If we are unable to do so, our business, results of operations and financial condition will be materially adversely affected. 
      We do not yet have products in the commercial markets. All of our potential products are in research or preclinical development. We cannot apply for regulatory approval of our potential products until we have performed additional research and development and testing. We cannot be certain that we, or our strategic partners, will be permitted to undertake clinical testing of our potential products and, if we are successful in initiating clinical trials, we may experience delays in conducting them. Our clinical trials may not demonstrate the safety and efficacy of our potential products, and we may encounter unacceptable side effects or other problems in the clinical trials. Should this occur, we may have to delay or discontinue development of the potential product that causes the problem. After a successful clinical trial, we cannot market products in the United States until we receive regulatory approval. Even if we are able to gain regulatory approval of our products after successful clinical trials and then commercialize and sell those products, we may be unable to manufacture enough products to maintain our business, which could have a negative impact on our financial condition. 

	The Success of Our Potential Products in Preclinical Studies Does Not Guarantee that these Results Will Be Replicated in Humans	
      Even though some of our therapeutic protein candidates have shown results in preclinical studies, these results may not be replicated in our clinical trials with humans. Human clinical results could be different from our expectations following our preclinical studies. Consequently, there is no assurance that the results in our preclinical studies are predictive of the results that we will see in our clinical trials with humans. Also, while we have demonstrated some evidence that our therapeutic protein candidates have utility in preclinical studies, these results do not mean that the resulting products will be safe and effective in humans. Our therapeutic protein candidates may have undesirable and unintended side effects or other characteristics that may prevent or limit their use. 

	Our Ability To Commercialize Gene-Based Products is Unproven	
      We have not developed any therapeutic or diagnostic products using proteins produced by the genes we have discovered. Before we make any products available to the public, we or our collaboration partners will need to conduct further research and development and complete laboratory testing and animal and human studies. Moreover, with respect to biopharmaceutical products, we or our collaboration partners will need to obtain regulatory approval before releasing any such products. With respect to agricultural products, our collaboration partner may need to obtain regulatory approval before releasing any such products. We have spent, and expect to continue to spend, significant amounts of time and money in determining the function of genes and the proteins they produce, using our own capabilities and those of our collaboration partners. Such determination process constitutes the first step in developing commercial products. We also have spent and will continue to spend significant amounts of time and money in developing processes for manufacturing of our recombinant proteins under pre-clinical development, yet we may not be able to produce sufficient protein for preclinical studies. A commercially viable product may never be developed from our gene discoveries. 
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      Our development of gene-based products is subject to several risks, including but not limited to: 
			
 	• 	the possibility that a product is toxic, ineffective or unreliable; 	
 		
 	• 	failure to obtain regulatory approval for the product; 	
 		
 	• 	the product may be difficult to manufacture on a large scale, or may not be economically feasible to market; 	
 		
 	• 	competitors may develop a superior product; or 	
 		
 	• 	other persons’ or companies’ patents may preclude our marketing of a product. 	
      Our biopharmaceutical development programs are currently in the research stage or in preclinical development. None of our potential therapeutic protein candidates have advanced to Phase I clinical trials. Our programs may not move beyond their current stages of development. Even if our research does advance, we will need to engage in certain additional preclinical development efforts to determine whether a product is sufficiently safe and efficacious to enter clinical trials. We have little experience with these activities and may not be successful in developing or commercializing products. 
      Under our collaboration arrangement with Chiron in the solid tumor cancer field, Chiron maintains responsibility for the development of a product. Under our collaboration arrangement with Kirin Brewery Company, Ltd., Kirin has primary responsibility for clinical development in its territory and we have primary responsibility in our territory. Under our collaboration arrangement with Deltagen, we share responsibility for development of a product. With respect to these arrangements, we run the risk that Chiron or Kirin may not pursue clinical development in a timely or effective manner, if at all, and that Deltagen may not cooperate with us in pursuing clinical development in a timely or effective manner. 
      If a product receives approval from the FDA to enter clinical trials, Phases I, II, and III of those trials include multi-phase, multi-center clinical studies to determine the product’s safety and efficacy prior to marketing. We cannot predict the number or extent of clinical trials that will be required or the length of the period of mandatory patient follow-up that will be imposed. Assuming clinical trials of any product are successful and other data appear satisfactory to us, we or our applicable collaboration partner will submit an application to the FDA and appropriate regulatory bodies in other countries to seek permission to market the product. Typically, the review process at the FDA is not predictable and can take up to several years. Upon completion of such review, the FDA may not approve our or our collaboration partner’s application or may require us to conduct additional clinical trials or provide other data prior to approval. Furthermore, even if our products or our collaboration partner’s products receive regulatory approval, delays in the approval process could significantly harm our business, financial condition and results of operations. 
      In addition, we may not be able to produce any products in commercial quantities at a reasonable cost or may not be able to market successfully such products. If we do not develop a commercially viable product, then we would suffer significant harm to our business, financial condition and operating results. 

	The Success of Our Business Depends on Patents and Other Proprietary Information	
      We currently have patents that cover some of our technological discoveries and patent applications that we expect to cover some of our gene, protein and technological discoveries. We have five issued patents relating to our gene and protein discoveries. We will continue to apply for patents for our discoveries. We cannot assure you that any of our currently pending or future applications will issue as patents, or that any patent issued to us will not be challenged, invalidated, circumvented or held unenforceable by way of an interference proceeding or litigation. The patent positions of biotechnology companies involve complex legal and factual questions. Even though we own patents, we cannot be certain that: 
			
 	• 	our patents will not be challenged; 	
 		
 	• 	protection against competitors will be provided by such patents; or 	
 		
 	• 	competitors will not independently develop similar products or design around our patents. 	
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      We seek patents on: 
			
 	• 	full-length gene sequences; 	
 		
 	• 	partial gene sequences; 	
 		
 	• 	proteins produced by those genes; 	
 		
 	• 	antibodies to those proteins; 	
 		
 	• 	diagnostic and therapeutic methods involving such genes, proteins or antibodies; and 	
 		
 	• 	processes, devices and other technology that enhance our ability to develop and/or manufacture gene-based products. 	
      To obtain a patent, we must identify a utility for the gene or the protein we seek to patent. Identifying a utility may require significant research and development with respect to which we may incur a substantial expense and invest a significant amount of time. 
      Patent applications we may apply for with respect to human therapeutics could require us to generate data, which may involve substantial costs. Finally, we cannot predict the timing of the grant of a patent. 
      We also rely on trade secret protection for our confidential and proprietary information. Although our policy is to enforce security measures to protect our assets, trade secrets are difficult to protect. We require all employees to enter into confidentiality agreements with us. However: 
			
 	• 	competitors may independently develop substantially equivalent proprietary information and techniques; 	
 		
 	• 	competitors may otherwise gain access to our trade secrets; 	
 		
 	• 	persons with whom we have confidentiality agreements may disclose our trade secrets; or 	
 		
 	• 	we may be unable to protect our trade secrets meaningfully. 	
      Certain of the patent applications protecting our subsidiary Callida’s SBH technology are filed only in the United States. Therefore, Callida currently is not able to prevent others from practicing SBH technology outside of the United States. Furthermore, although we believe Callida intends to defend its patents, it may not prevail in a court case against others who use similar technology. 
      Certain of the patent applications protecting our gene-related information are filed only in the United States. Even where we have filed our patents applications internationally, we may choose not to maintain foreign patent protection through failure to enter national phase or failure to pay maintenance annuities. 
      We may be required to obtain licenses to patents or other proprietary rights of others. These required licenses may not, however, be made available on terms acceptable to us, or at all. If we do not obtain these licenses, we may not be able to develop, manufacture or sell products, or encounter delays in product market introductions, or incur substantial costs while we attempt to design around existing patents. Any of these obstacles could significantly harm our business, financial condition and operating results. 

	Our Business is Difficult to Evaluate Because We Have Been Focused on Our Current Business Strategy for Only Approximately Four Years	
      We commenced operations in the fourth quarter of 1994. Our initial business focused on gene discovery using our signature by hybridization platform, and applications of our SBH technology including the HyChip system. Not only is our operating history relatively short, but we began to transition our business strategy from gene discovery to research and development of potential therapeutic protein candidates in 1998. Accordingly, we have a limited operating history from which you can evaluate our present business and future prospects. As a relatively new entrant to the business of biopharmaceutical research and development, we face risks and uncertainties relating to our ability to implement our business plan successfully. Our prospects must be considered in light of the risks, expenses and difficulties frequently encountered by companies in their early 
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state of development, particularly companies in new and rapidly evolving markets such as research and development of gene-based products. If we are unsuccessful in addressing these risks and uncertainties, our business, results of operations, financial condition and prospects will be materially adversely affected. 

	We Lack Manufacturing Experience and We Intend to Rely Initially on Contract Manufacturers	
      We do not currently have significant manufacturing facilities. We are dependent on contract research and manufacturing organizations, and will be subject to the risks of finalizing contractual arrangements, transferring technology and maintaining relationships with such organizations in order to file an IND with the FDA and proceed with clinical trials for any of our potential therapeutic protein candidates. We are dependent on third-party contract research organizations to conduct certain research, including good laboratory practices toxicology studies in order to gather the data necessary to file an IND with the FDA for any of our potential therapeutic protein candidates. Our potential therapeutic protein candidates have never been manufactured on a commercial scale. Third-party manufacturers may not be able to manufacture such proteins at a cost or in quantities necessary to make them commercially viable. In addition, if any of our potential therapeutic protein candidates enter the clinical trial phase, initially we will be dependent on third-party contract manufacturers to produce the volume of current good manufacturing practices materials needed to complete such trials. We will need to enter into contractual relationships with these or other organizations in order to (i) complete the GLP toxicology and other studies necessary to file an IND with the FDA, and (ii) produce a sufficient volume of cGMP material in order to conduct clinical trials of our potential therapeutic protein candidates. We cannot be certain that we will be able to do so on a timely basis or that we will be able to obtain sufficient quantities of material on commercially reasonable terms. In addition, the failure of any of these relationships with third-party contract organizations may result in a delay of our filing for an IND, or our progress through the clinical trial phase. Any significant delay or interruption would have a material adverse effect on our ability to file an IND with the FDA and/or proceed with the clinical trial phase for any of our potential therapeutic protein candidates. 
      Moreover, contract manufacturers that we may use must continually adhere to current cGMP regulations enforced by the FDA through a facilities inspection program. If the facilities of such manufacturers cannot pass a pre-approval plant inspection, the FDA premarket approval of our products will not be granted. 

	We Are Dependent Upon Collaborative Arrangements	
      As we have transitioned our business from gene discovery to research and development of biopharmaceutical candidates, we have shifted our focus for new collaborative arrangements. We are now focusing on new collaborative arrangements where we would share costs of identifying, developing and marketing product candidates. There can be no assurance that we will be able to negotiate new collaboration arrangements of this type on acceptable terms, or at all. 
      Our subsidiary Callida, engaged in the development of SBH technology, is also dependent on the cooperation of its partners in collaborative arrangements and may also need to negotiate new collaborative arrangements in the future. 
      The success of our business is dependent, in significant part, upon our ability to enter into multiple collaboration arrangements and to manage effectively the numerous issues that arise from such collaborations. Management of our relationships with our collaboration partners will require: 
			
 	• 	our management team to devote a significant amount of time and effort to the management of these relationships; 	
 		
 	• 	effective allocation of our resources to multiple projects; and 	
 		
 	• 	an ability to obtain and retain management, scientific and other personnel. 	
      Our need, including the need of our direct and indirect subsidiaries, to manage simultaneously a number of collaboration arrangements may not be successful, and the failure to manage effectively such collaborations would significantly harm our business, financial condition and results of operations. 
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      The research we perform in our gene discovery collaborative arrangements is at an early stage of product development. The successful development of products under these collaborations is highly dependent on the performance of our collaboration partners. Under our gene discovery collaborative arrangements, our collaboration partners are generally required to (i) undertake and fund certain research and development activities with us, (ii) make payments to us upon achievement of certain scientific milestones and (iii) pay royalties to us when and if they commercially market a product developed from the collaborative arrangement. We do not directly control the amount or timing of resources devoted to development activities by our collaboration partners. We, therefore, face a risk that our collaboration partners may not commit sufficient resources to our research and development programs or the commercialization of our products or may not perform their obligations as expected. If any collaboration partner fails to conduct its activities to be performed under our collaboration arrangement in a timely manner, or at all, our expectations of royalties and milestone payments related to such collaboration arrangement could be delayed or eliminated. Also, our current or future collaboration partners, if any, may independently pursue existing or other development-stage products or alternative technologies in preference to those they are developing in collaboration with us. Further, disputes may arise with respect to ownership of products developed under any such collaboration arrangement. Finally, any of our current collaboration arrangements may be terminated or not renewed by our collaboration partners, and we may not be able to negotiate additional collaboration arrangements in the future on acceptable terms, or at all. 

	We Are Dependent on Key Personnel	
      The success of our business is highly dependent on the principal members of our scientific and management staff and including our chairman and senior management team. The loss of the services of any such individual might significantly delay or prevent us from achieving our scientific or business objectives. Competition among biotechnology and biopharmaceutical companies for qualified employees is intense. The ability to retain and attract qualified individuals is critical to our success. We may not be able to attract and retain qualified employees currently or in the future on acceptable terms, or at all. The failure to do so would significantly harm our business, financial condition and results of operations. 
     Management of Growth 
      We expect to increase significantly the number of our employees and the scope of our operations. Such growth may place a significant strain on our management and operations. In order to execute our strategy to build a fully integrated biopharmaceutical company, develop therapeutic or diagnostic products, and obtain regulatory approvals, we will need to: 
			
 	• 	attract and train skilled employees; 	
 		
 	• 	attract and retain employees with expertise to ensure that we meet FDA and foreign regulatory requirements for conducting clinical trials; 	
 		
 	• 	expand our facilities for additional research and development laboratories and offices and acquire additional equipment and supplies; 	
 		
 	• 	expand our protein production capacity; 	
 		
 	• 	enter into and manage contractual relationships with contract research and manufacturing organizations; and 	
 		
 	• 	get additional funding. 	
      Our ability to manage such growth effectively will depend upon our ability to broaden our management team and to attract, hire and retain skilled employees. Our success also will depend on the ability of our officers and key employees to continue to implement and improve our operational, management information and financial control systems and to expand, train and manage our employee base. Inability to manage growth effectively could significantly harm our business, financial condition and operating results. 
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	We Must Attract and Retain Qualified Employees and Consultants	
      Our success will depend on our ability to retain our key executive officers and scientific staff to develop our potential products and formulate our research and development strategy. We have programs in place to retain personnel, including programs to create a positive work environment and competitive compensation packages. Because competition for employees in our field is intense, however, we may be unable to retain our existing personnel or attract additional qualified employees. Our success also depends on the continued availability of outside scientific collaborators to perform research and develop processes to advance and augment our internal research efforts. Competition for collaborators is intense. If we do not attract and retain qualified personnel and scientific collaborators, and if we experience significant turnover or difficulties recruiting new employees, our research and development programs could be delayed and we could experience difficulties in generating sufficient revenue to maintain our business. 

	Future Sales of Our Common Stock May Depress Our Stock Price	
      Sales in the public market of substantial amounts of our common stock could depress prevailing market prices of our common stock. As of March 15, 2002, we had 19,371,052 shares of our common stock outstanding. All of these shares are freely transferable without restriction or further registration under the Securities Act of 1933, as amended, except for shares held by our affiliates and unregistered shares held by non-affiliates. As of March 15, 2002, our affiliates held 4,414,946 shares of our common stock and non-affiliates held 543,027 unregistered shares of our common stock, which are transferable pursuant to Rule 144 as promulgated under the Securities Act of 1933, subject to the volume limitations of Rule 144. Although we do not believe that our affiliates have any present intentions to dispose of any shares of common stock owned by them, there can be no assurance that such intentions will not change in the future. An additional 708,480 shares owned by a Yugoslav entity have been held in a blocked account pursuant to restrictions imposed by the U.S. Department of Treasury arising from the political situation in former Yugoslavia and therefore have not been able to be voted or transferred. We believe that some of these restrictions may have been removed and the remaining restrictions may be removed in the future. There can be no assurance as to how long any such restrictions will remain in effect. 
      As of March 15, 2002, warrants to purchase 3,149,433 shares of our common stock were outstanding. In addition, under registration statements on Form S-8 under the Securities Act of 1933, we have registered approximately 5,605,572 shares of our common stock for sale upon the exercise of outstanding options under our 1995 Stock Option Plan, Non-Employee Director Stock Option Plan, Scientific Advisory Board/ Consultants Stock Option Plan, and stock option agreements entered into outside of any of our stock option plans and under our Employee Stock Purchase Plan and our Non-Qualified Employee Stock Purchase Plan. Shares of our common stock acquired pursuant to these plans and agreements are available for sale in the open market. In addition, we have reserved approximately 1,268,160 shares of our common stock for issuance upon the exercise of outstanding options under stock option agreements entered into outside of any of our stock option plans. As of March 15, 2002, 229,540 of the 1,268,160 shares of these options were exercisable. Although these shares have not been registered under the Securities Act of 1933, and therefore are restricted securities within the meaning of Rule 144 under the Securities Act of 1933, we intend to register these shares on a registration statement on Form S-8 under the Securities Act of 1933. Certain options or warrants may have exercise prices that are substantially below the prevailing market price of our common stock. The exercise of those options or warrants, and the prompt resale of shares of our common stock received, may result in downward pressure on the price of our common stock. The existence of the currently outstanding warrants and options to purchase our common stock may negatively affect our ability to complete future equity financings at acceptable prices and on acceptable terms. 

	Our Subsidiary Callida Genomics, Inc. May Not Be Able to Raise Third Party Financing	
      In October 2001, we formed Callida Genomics, Inc. to develop and commercialize our SBH technology. We recognize 90% of Callida’s operating losses in our consolidated results of operations up to the point where Affymetrix’s initial majority interest investment is depleted. Beyond that point, the Company will absorb 100% of the net losses until Callida generates net income. There is no guarantee, however, that Callida will meet its 
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technical milestone and other requirements to obtain additional funding through Affymetrix and Hyseq. There is also no assurance that Callida will be able to obtain any third party financing or that any such financing that Callida obtains will be on favorable terms or that the funding from outside sources will be sufficient to fund Callida’s operations. We cannot assure the success of Callida and if Callida is unable to obtain sufficient funding from outside sources, we may abandon their projects or bear the costs of financing Callida ourselves, which will divert our resources from other biopharmaceutical projects. 

	We Have a History of Operating Losses and May Never Be Profitable	
      For the years ended December 31, 2001, 2000 and 1999, we had net losses of $36.5 million, $22.3 million and $18.5 million, respectively. As of December 31, 2001, we had an accumulated deficit of $108.4 million. The process of developing our therapeutic protein candidates will require significant additional research and development, preclinical testing, clinical trials and regulatory approvals. These activities, together with general administrative expenses, are expected to result in operating losses for the foreseeable future. We may never generate profits, and if we do become profitable, we may be unable to sustain or increase profitability on a quarterly or annual basis. As a result, the trading price of our stock could decline. 

	We May Face Fluctuations in Operating Results	
      Our operating results may rise or fall significantly as a result of many factors, including: 
			
 	• 	the amount of research and development we engage in; 	
 		
 	• 	the progress we make with research and preclinical studies on our therapeutic protein candidates, and the number of candidates in research and preclinical studies; 	
 		
 	• 	our ability to expand our facilities to support our operations; 	
 		
 	• 	our ability to enter into new strategic relationships; 	
 		
 	• 	the nature, effectiveness, size, timing or termination of our collaborative arrangements; 	
 		
 	• 	the costs involved in preparing, filing, prosecuting, maintaining and enforcing patent claims; 	
 		
 	• 	the possibility that others may have or obtain patent rights that are superior to ours; 	
 		
 	• 	changes in government regulation; and 	
 		
 	• 	competitors’ release of successful products into the market. 	
      Because substantially all of our potential products currently are in research or preclinical development, revenues from sales of any products will not occur for at least the next several years, if at all. We also have a high percentage of fixed costs such as lease obligations. As a result, we may experience fluctuations in our operating results from quarter to quarter and continue to generate losses. Quarterly comparisons of our financial results may not necessarily be meaningful and investors should not rely upon such results as an indication of our future performance. 
     We Face Potential Volatility of Our Stock Price 
      Our common stock has been traded on the Nasdaq National Market since August 1997. The market price of our common stock may fluctuate substantially because of a variety of factors, including: 
			
 	• 	volatility and uncertainty in the capital markets in general; 	
 		
 	• 	fluctuations in our results of operations; 	
 		
 	• 	sales of our common stock by existing holders; 	
 		
 	• 	loss of key personnel; 	
 		
 	• 	economic and other external factors; 	
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 	• 	announcements by governmental agencies that may have, or may be perceived to have, an impact on our potential products; 	
 		
 	• 	changes in our earnings estimates; 	
 		
 	• 	changes in accounting principles; 	
 		
 	• 	lack of trading volume in our stock; 	
 		
 	• 	fluctuations within the biotechnology sector; 	
 		
 	• 	announcements by competitors; and 	
 		
 	• 	other factors not within our control. 	
      In addition, the stock market in general, and the market for biotechnology and other life science stocks in particular, has historically been subject to extreme price and volume fluctuations. This volatility has had a significant effect on the market prices of securities issued by many companies for reasons unrelated to the operating performance of these companies. In the past, following periods of volatility in the market price of a company’s securities, class action securities litigation has often been instituted against such a company. Any such litigation instigated against us could result in substantial costs and a diversion of management’s attention and resources, which could significantly harm our business, financial condition and operating results. 

	FDA Regulatory Approval of Our Products is Uncertain; We Face Heavy Government Regulation	
      Products such as those proposed to be developed by us or our collaboration partners, typically will be subject to an extensive regulatory process by federal, state and local governmental authorities, including the FDA, and comparable agencies in other countries before we may market and sell such products. In order to obtain regulatory approval of a drug product, we or our collaboration partners must demonstrate to the satisfaction of the applicable regulatory agency, among other things, that such product is safe and effective for its intended uses. In addition, we must show that the manufacturing facilities used to produce the products are in compliance with cGMP requirements. In the event we or our collaboration partners, develop products classified as drugs, we and our collaboration partners will be required to obtain appropriate approvals as well. 
      If our subsidiary Callida sells applications of our SBH technology for clinical diagnostics, it will need to comply with appropriate cGMP regulations pertaining to devices. The new Quality System Regulation imposes design controls and makes other significant changes in the requirements applicable to manufacturers. Callida must also demonstrate that a Biologic License Application or New Drug Application for any biological products would be approved by the applicable government agency. In addition, if Callida markets applications of our SBH technology as diagnostic products, they may be considered to be medical devices and Callida or its collaboration partners will be required to show that the diagnostic product is substantially equivalent to a legally marketed product not requiring FDA approval. In addition, Callida must demonstrate that it is capable of manufacturing the product in accordance with the relevant standards. To obtain FDA approval for such products, Callida must submit extensive data to the FDA, including pre-clinical and clinical trial data to prove the safety and efficacy of the device. Clinical trials are normally conducted over a two- to five-year period, but may take longer to complete as a result of many factors, including: 
			
 	• 	slower than anticipated patient enrollment; 	
 		
 	• 	difficulty in finding a sufficient number of patients fitting the appropriate inclusion criteria; 	
 		
 	• 	difficulty in acquiring a sufficient supply of clinical trial materials; or 	
 		
 	• 	adverse events occurring during the trials. 	
      Furthermore, data obtained from preclinical and clinical activities are susceptible to varying interpretations, which could delay, limit or prevent regulatory approval or clearance for a product. 
      The process of obtaining FDA and other required regulatory approvals and clearances is lengthy and will require us to expend substantial capital and resources. We may not ultimately be able to obtain the necessary 
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approvals and clearances. Moreover, if and when our products do obtain such approval or clearances, the marketing, distribution and manufacture of such products would remain subject to extensive ongoing regulatory requirements. Failure to comply with applicable regulatory requirements can result in: 
			
 	• 	warning letters; 	
 		
 	• 	fines; 	
 		
 	• 	injunctions; 	
 		
 	• 	civil penalties; 	
 		
 	• 	recall or seizure of products; 	
 		
 	• 	total or partial suspension of production; 	
 		
 	• 	refusal of the government to grant approvals, premarket clearance or premarket approval; or 	
 		
 	• 	withdrawal of approvals and criminal prosecution. 	
      We also are subject to numerous federal, state and local laws, regulations and recommendations relating to safe working conditions, laboratory and manufacturing practices, the experimental use of animals, the environment and the use and disposal of hazardous substances used in connection with our discovery, research and development work, including radioactive compounds and infectious disease agents. In addition, we cannot predict the extent of government regulations or the impact of new governmental regulations that might significantly harm the discovery, development, production and marketing of our products. We may be required to incur significant costs to comply with current or future laws or regulations and we may be adversely affected by the cost of such compliance. 
      If we market therapeutic and diagnostic products outside the United States, such products will be subject to foreign regulatory requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement. Such requirements vary from country to country and are becoming more restrictive throughout the European Community. The process of obtaining foreign regulatory approvals can be lengthy and require the expenditure of substantial capital and resources. We or our collaboration partners may not be successful in obtaining the necessary approvals. 
      Any delay or failure by us or our collaboration partners to obtain regulatory approvals for our products: 
			
 	• 	would adversely affect our ability to generate product and royalty revenues; 	
 		
 	• 	could impose significant additional costs on us or our collaboration partners; 	
 		
 	• 	could diminish competitive advantages that we may attain; and 	
 		
 	• 	would adversely affect the marketing of our products. 	
     We Face Intense Competition 
      The genomics and biopharmaceutical industries are intensely competitive. Our strategy as a biopharmaceutical company is to find the genes of the human genome that are most likely to be involved in a disease condition and to focus on identifying product candidates from the proteins produced by genes. There are a finite number of genes in the human genome, virtually all of which have been or will soon be identified. Our competitors include major pharmaceutical and biotechnology firms, not-for-profit entities and United States and foreign government-financed programs, many of which have substantially greater research and product development capabilities and financial, scientific, marketing and human resources than we do. As a result, they may succeed in identifying genes and determining their functions or developing products earlier than we or our current or future collaboration partners do. They also may obtain patents and regulatory approvals for such products more rapidly than we or our current or future collaboration partners, or develop products that are more effective than those proposed to be developed by us or our collaboration partners. Further, any potential products based on genes we identify ultimately will face competition from other 
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companies developing gene-based products as well as from companies developing other forms of treatment for diseases which may be caused by, or related to, the genes we identify. 
      Many of the companies developing competing products have significantly greater financial resources than we have. Many such companies also have greater expertise than we or our collaboration partners have in discovery, research and development, manufacturing, preclinical and clinical testing, obtaining regulatory approvals and marketing. Other smaller companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. Academic institutions, government agencies and other public and private research organizations may also conduct research, seek patent protection and establish collaborative arrangements for discovery, research, clinical development and marketing of products similar to our products. These companies and institutions compete with us in recruiting and retaining qualified scientific and management personnel as well as in acquiring technologies complementary to our programs. We will face competition with respect to: 
			
 	• 	product efficacy and safety; 	
 		
 	• 	the timing and scope of regulatory approvals; 	
 		
 	• 	availability of resources; 	
 		
 	• 	reimbursement coverage; and 	
 		
 	• 	price and patent position, including potentially dominant patent positions of others. 	
      There can be no assurance that research and development by others will not render the products that we may develop obsolete or uneconomical, or result in treatments, cures or diagnostics superior to any therapy or diagnostic developed by us or that any therapy we develop will be preferred to any existing or newly developed technologies. While we believe that our technology provides a significant competitive advantage, any one of our competitors may discover and establish a patent position in one or more genes which we designate as a product candidate, before we do. Competition in this field is expected to intensify. Certain of our collaboration partners may now be, or could become, competitors. 
      Competition in the area of DNA analysis tools is intense and expected to increase. Technologies in this area are new and rapidly evolving. Other companies also are developing or have developed DNA analysis tools that may compete with applications of Callida’s SBH technology. Many of these companies have significantly greater research and development, marketing and financial resources than we do, and therefore represent significant competition. 
     We Lack Marketing Experience for Biopharmaceuticals 
      We currently have no sales, marketing or distribution capability. For the foreseeable future, we intend to rely primarily on our current and future collaboration partners or licensors, if any, to market our products. Such collaboration partners, however, may not have effective sales forces and distribution systems. If we are unable to maintain or establish such relationships and are required to market any of our products directly, we will have to develop our own marketing and sales force with the appropriate technical expertise and with supporting distribution capabilities. We may not be able to maintain or establish such relationships with third parties or develop in-house sales and distribution capabilities. To the extent that we depend on our collaboration partners or third parties for marketing and distribution, any revenues we receive will depend upon the efforts of such collaboration partners or third parties. Such efforts may not be successful. 

	Our Products May Not Be Accepted in the Marketplace	
      Even if they are approved for marketing, products we develop may never achieve market acceptance. Our products, if successfully developed, will compete with a number of traditional drugs and therapies manufactured and marketed by major pharmaceutical and other biotechnology companies. Our products will also compete with new products currently under development by such companies and others. The degree of market 
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acceptance of any products developed by us, alone, or in conjunction with our collaboration partners, will depend on a number of factors, including: 
			
 	• 	the establishment and demonstration of the clinical efficacy and safety of the products; 	
 		
 	• 	our products’ potential advantage over alternative treatment methods; and 	
 		
 	• 	reimbursement policies of government and third-party payors. 	
      Physicians, patients or the medical community in general may not accept and utilize any of the products that we alone, or in conjunction with our collaboration partners, develop. The lack of such market acceptance would significantly harm our business, financial condition and results of operations. 
      We may develop diagnostic testing products in the future. Our success in diagnostics will depend in large part upon our ability to obtain customers and upon the ability of these customers to market genetic tests performed with our technology properly. Genetic tests, including any performed using applications of Callida’s SBH technology, may be difficult to interpret and may lead to misinformation or misdiagnosis. Even when a genetic test identifies the existence of a mutation in a person, the test cannot determine with absolute certainty whether the tested individual will develop the disease or condition for which the test is performed. The prospect of broadly available genetic predisposition testing has raised societal and governmental concerns regarding the appropriate use and the confidentiality of information provided by such testing. Government authorities could limit the use of genetic testing or prohibit testing for genetic predisposition to certain conditions. Ethical concerns about genetic testing may adversely affect market acceptance of our technology for diagnostic applications. Impaired market acceptance of our technology could significantly harm our business, financial condition and operating results. 

	We Face Uncertainties Related to SBH Technology Applications	
      We have developed applications of our SBH technology, currently in our subsidiary, Callida, including the chip component to be used with the HyChip system. As Callida continues development of SBH technology applications, it may discover problems in the functioning of these applications, including the HyChip system. Callida may be unable to improve applications of our SBH technology enough to be able to market them successfully. Further, SBH technology applications compete against other DNA analysis tools and well-established technologies. We cannot predict the outcome of these uncertainties. 

	We Face Uncertainty With Respect to Pricing, Third-Party Reimbursement and Health Care Reform	
      Our ability to collect significant royalties from our products may depend on our ability, and the ability of our collaboration partners or customers, to obtain adequate levels of reimbursement from third-party payors such as: 
			
 	• 	government health administration authorities; 	
 		
 	• 	private health insurers; 	
 		
 	• 	health maintenance organizations; 	
 		
 	• 	pharmacy benefit management companies; and 	
 		
 	• 	other health care related organizations. 	
      Currently, third-party payors are increasingly challenging the prices charged for medical products and services, and the overall availability of third-party reimbursement is limited and uncertain for genetic predisposition tests. Third-party payors may deny their insured reimbursement if they determine that a prescribed device or diagnostic test (i) has not received appropriate clearances from the FDA or other government regulators, (ii) is not used in accordance with cost-effective treatment methods as determined by the third-party payor, or (iii) is experimental, unnecessary or inappropriate. If third-party payors routinely deny reimbursement, we may not be able to market our products effectively. We also face the risk that we will have to offer our diagnostic products at low prices as a result of the current trend in the United States towards 
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managed health care through health maintenance organizations. Prices could be driven down by health maintenance organizations which control or significantly influence purchases of health care services and products. Legislative proposals to reform health care or reduce government insurance programs could also adversely affect prices of our products. The cost containment measures that health care providers are instituting and the results of potential health care reforms may prevent us from maintaining prices for our products that are sufficient for us to realize profits and may otherwise significantly harm our business, financial condition and operating results. 

	We Face Product Liability Exposure and Potential Unavailability of Insurance	
      We risk financial exposure to product liability claims in the event that the use of products developed by us or our collaboration partners, if any, result in personal injury. We may experience losses due to product liability claims in the future. We have obtained limited product liability insurance coverage. Such coverage, however, may not be adequate or may not continue to be available to us in sufficient amounts or at an acceptable cost, or at all. We may not be able to obtain commercially reasonable product liability insurance for any product approved for marketing. A product liability claim or other claim, product recalls, as well as any claims for uninsured liabilities or in excess of insured liabilities, may significantly harm our business, financial condition and results of operations. 

     	We Use Hazardous Materials	
      Our research and development activities involve the controlled use of hazardous materials. Although we believe that our safety procedures for handling and disposing of these materials comply with applicable laws and regulations, we cannot eliminate the risk of accidental contamination or injury from hazardous materials. If a hazardous material accident occurred, we would be liable for any resulting damages. This liability could exceed our financial resources. Additionally, hazardous materials are subject to regulatory oversight. If our access to hazardous materials necessary for our operations is limited by federal, state or local regulatory agencies, we could experience delays in our research and development programs. Paying damages or experiencing delays caused by restricted access to necessary materials could reduce our ability to generate revenues and make it more difficult to fund our operations. 

	We Have Implemented Anti-Takeover Provisions that May Reduce the Market Price of Our Common Stock	
      Our Amended and Restated By-Laws provide that members of our board of directors serve staggered three-year terms. Our Amended and Restated Articles of Incorporation provide that all stockholder action must be effected at a duly called meeting and not by a consent in writing. The Amended and Restated By-Laws provide, however, that our stockholders may call a special meeting of stockholders only upon a request of stockholders owning at least 50% of our capital stock. These provisions of our Amended and Restated Articles of Incorporation and our Amended and Restated By-Laws could discourage potential acquisition proposals and could delay or prevent a change in control. These provisions are intended to enhance the likelihood of continuity and stability in the composition of our board of directors and in the policies formulated by our board of directors. We also intended these provisions to discourage certain types of transactions that may involve an actual or threatened change of control. We designed these provisions to reduce our vulnerability to unsolicited acquisition proposals and to discourage certain tactics that may be used in proxy fights. These provisions, however, could also have the effect of discouraging others from making tender offers for our shares. As a consequence, they also may inhibit fluctuations in the market price of our shares that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management. 
      We are permitted to issue shares of our preferred stock without stockholder approval upon such terms as our board of directors determines. Therefore, the rights of the holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of our preferred stock that may be issued in the future. In addition, the issuance of preferred stock could have a dilutive effect on the holdings of our current stockholders. 
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      On June 5, 1998, our board of directors adopted a rights plan and declared a dividend with respect to each share of our common stock then outstanding. This dividend took the form of a right, which entitles the holders to purchase one-one thousandth of a share of our Series B junior participating preferred stock at a purchase price of $175, subject to adjustment from time to time. These rights have also been issued in connection with each share of our common stock issued after June 15, 1998. The rights are exercisable only if a person or entity or affiliated group of persons or entities acquires, or has announced its intention to acquire, 15% (27.5% in the case of certain approved stockholders) or more of our outstanding common stock. The adoption of the rights plan makes it more difficult for a third party to acquire control of us without the approval of our board of directors. 
      Nevada Revised Statutes Sections 78.411 through 78.444 prohibit an “interested stockholder,” under certain circumstances, from entering into specified combination transactions with a Nevada corporation, unless certain conditions are met. Under the statute, an “interested stockholder” is a person who beneficially owns, directly or indirectly, 10% or more of a corporation’s voting stock or an affiliate or associate of a corporation who at any time within the prior three years beneficially owned, directly or indirectly, 10% or more of a corporation’s voting stock. According to the statute, we may not engage in a combination within three years after an interested stockholder acquires our shares, unless (i) our board of directors approves the combination prior to the interested stockholder becoming an interested stockholder or (ii) holders of a majority of voting power not beneficially owned by the interested stockholder approve the combination at a meeting called no earlier than three years after the date the interested stockholder became an interested stockholder. 
      Nevada Revised Statutes Sections 78.378 through 78.3793 further prohibit an acquirer, under certain circumstances, from voting shares of a target corporation’s stock after crossing certain threshold ownership percentages, unless the acquirer obtains the approval of the target corporation’s stockholders. This statute only applies to Nevada corporations that do business directly or indirectly in Nevada. We do not intend to do business in Nevada within the meaning of the statute. Therefore, it is unlikely that the statute will apply to us. 
      The provisions of our governing documents, our existing agreements and current Nevada law may, collectively: 
			
 	• 	lengthen the time required for a person or entity to acquire control of us through a proxy contest for the election of a majority of our board of directors; 	
 		
 	• 	discourage bids for our common stock at a premium over market price; and 	
 		
 	• 	generally deter efforts to obtain control of us. 	

	Risk of Natural Disasters and Power Blackouts	
      Our facilities are located in Sunnyvale, California. In the event that a fire or other natural disaster (such as an earthquake) prevents us from operating our production line, our business, financial condition and operating results would be materially, adversely affected. Some of our landlords maintain earthquake coverage for our facilities. Although we maintain personal property and business interruption coverage, we do not maintain earthquake coverage for personal property or resulting business interruption. 
      The State of California has experienced natural gas and electricity problems, which have resulted in rolling power blackouts, some of which have affected our facilities. In addition, we, like others, have experienced large fluctuation in our natural gas rates and may experience steep fluctuations in our electric rates. Although we have an auxiliary generator, it is intended for emergency backup in the event of a power outage and is not capable of powering our entire operations. Future power blackouts and/or large increases in our utility costs could harm our business, financial condition and results of operations. 
Item 2.     Properties 
      We lease a 12,000 square foot facility at 670 Almanor Avenue, Sunnyvale, California. The lease on this facility expires June 30, 2005, and requires base payments on average of approximately $25,000 per month. 
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We also lease approximately 59,000 square feet of space at 675 Almanor Avenue, Sunnyvale, California, which is across the street from 670 Almanor. This lease expires on June 30, 2005, and has a five-year renewal option which, if exercised, would extend the lease to June 30, 2010. It requires base payments on average of approximately $95,000 per month. In June 2000 we leased an additional approximately 59,000 square feet of space at 225, 249 and 257 Humbolt Court in Sunnyvale, California, approximately one mile from our current operating facilities. The lease on this new space requires base lease payments on average of approximately $317,000 per month and extends through July 2011. Approximately 15,000 square feet of this Humboldt Court space is planned for use by our subsidiary Callida and the remainder of the space is currently being evaluated for optimal use. In April 2001, we leased an additional approximately 140,000 square feet of space at 985 Almanor Avenue in Sunnyvale, California, adjacent to our current operating facilities. The lease on this new space requires base lease payment of approximately $451,000 per month and extends through May 2011. In the initial phase of our facilities expansion, we plan to build out approximately 55,000 square feet of this space to accommodate new research and development offices and laboratories to support preclinical development activities, including preliminary preclinical safety and efficacy studies in rodents, functional cell biology assays, cell based functional screening efforts, protein production, protein characterization and analytical assay development. To complete this build out as planned, we will need to secure additional financing. The remaining portion of the building may be used for further research and development laboratory expansion, process development and/or clinical manufacturing as appropriate. 
Item 3.     Legal Proceedings 
      In October 2001, the Company entered into a settlement agreement with Affymetrix providing for the comprehensive settlement of all existing litigation between the two companies that began in March 1997. The lawsuits involved are Hyseq, Inc., Plaintiff/ Counterdefendant v. Affymetrix, Inc., Defendant/ Counterclaimant, Case No. C 97-20188 RMW, United States District Court, Northern District of California, San Jose Division; Affymetrix, Inc., Plaintiff v. Hyseq, Inc., Defendant, Case No C 99-21163 JF, United States District Court, Northern District of California, San Jose Division; and Hyseq, Inc., Plaintiff/ Counterdefendant v. Affymetrix, Inc., Defendant/ Counterclaimant, Case No. C 00-20050 RMW, United States District Court, Northern District of California, San Jose Division. On October 26, 2001, Hyseq and Affymetrix jointly filed a “Stipulation and Proposed Order of Dismissal and Final Judgment” in each of these lawsuits which sought dismissal, with prejudice, in each case. Hyseq and Affymetrix have each acknowledged the validity and enforceability of the patents involved in these lawsuits, which are: Hyseq’s U.S. Patent Nos. 5,202,231, 5,525,464, 5,695,940, 6,018,041 and 5,972,619; and Affymetrix’ U.S. Patent Nos. 5,795,716, 5,744,305 and 5,800,992. 
      Hyseq and Affymetrix have also been involved in patent interference proceedings titled Chee v. Drmanac, Interference No. 104,552 before the U.S. Patent and Trademark Office. In November 2001, Hyseq entered an abandonment of contest in the interference with respect to our pending patent application. 
      In October 2001, the Company also announced its plan to reorganize into two distinct companies. We are continuing our biopharmaceutical business as “Hyseq Pharmaceuticals, Inc.” and our new majority-owned subsidiary, Callida Genomics, Inc. is focusing on the development and commercialization of our SBH technology. Incident to the settlement, Callida entered into a collaboration arrangement with Affymetrix, through Callida’s wholly-owned subsidiary, N-Mer Inc., for the development and commercialization of a high speed DNA sequencing chip. The Company, Callida, N-Mer and Affymetrix also entered into various cross-licensing arrangements, and Affymetrix agreed to become the exclusive array and system supplier to N-Mer and the exclusive sales agent, subject to customary performance obligations, for the distribution of any products developed by N-Mer. Affymetrix agreed to pay the Company a one-time license fee for a non-exclusive license of array-related patents in the field of non-universal probe arrays and to loan the Company $4 million, all for use to fund Callida and N-Mer. The loan, which bears interest at the rate of 7.5% per annum and matures five years after closing, is prepayable by the Company at any time, exchangeable at the option of the Company for common stock of the Company and secured by the Company’s equity interest in Callida. Affymetrix has an initial 10% equity ownership interest in Callida. Affymetrix and the Company agreed to each make additional investments in N-Mer, conditioned on N-Mer’s attainment of a specified technical 
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milestone and the procurement of third-party financing. Callida agreed to grant Affymetrix an option to purchase a majority interest in N-Mer, which is exercisable at any time within five years. 

Item 4.     	Submission of Matters to a Vote of Security Holders	
      No matters were submitted to the vote of stockholders through the solicitation of proxies or otherwise during the fourth quarter of the year ended December 31, 2001. 
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PART II 
Item 5.     Market for Registrant’s Common Equity and Related Stockholder Matters 
      Our common stock began trading on the Nasdaq Stock Market on August 8, 1997 under the symbol “HYSQ.” Prior to that date, there was no established trading market for the common stock. The following table sets forth, for the periods indicated, the high and low bid information for the common stock, as reported by the Nasdaq Stock Market: 
 	 	 	 	 	 	 	 	 	
		High		Low	
					
Fiscal 2000:	 	 	 	 	 	 	 	 	
First Quarter 	 	$	139.50	 	 	$	12.44	 	
Second Quarter 	 	$	46.88	 	 	$	17.00	 	
Third Quarter 	 	$	53.25	 	 	$	30.25	 	
Fourth Quarter 	 	$	37.00	 	 	$	11.25	 	
Fiscal 2001:	 	 	 	 	 	 	 	 	
First Quarter 	 	$	16.44	 	 	$	7.50	 	
Second Quarter 	 	$	18.00	 	 	$	7.50	 	
Third Quarter 	 	$	11.35	 	 	$	5.20	 	
Fourth Quarter 	 	$	10.22	 	 	$	5.94	 	
      As of March 15, 2002, there were approximately 187 stockholders of record of our common stock. We have not paid dividends to our stockholders since our inception and we do not plan to pay cash dividends in the foreseeable future. We currently intend to retain earnings, if any, to finance our growth. 
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Item 6.     Selected Consolidated Financial Data 

		Year Ended December 31,	
			
		2001		2000		1999		1998		1997	

		(In thousands, except per share amounts)	
Statement of Operations Data:	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
Contract revenues 	 	$	24,590	 	 	$	15,604	 	 	$	6,397	 	 	$	9,590	 	 	$	6,199	 	
Loss before minority interest 	 	 	(36,765	)	 	 	(22,253	)	 	 	(18,547	)	 	 	(16,369	)	 	 	(6,537	)	
Loss attributable to minority interest 	 	 	293	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	
Net loss 	 	 	(36,472	)	 	 	(22,253	)	 	 	(18,547	)	 	 	(16,369	)	 	 	(6,537	)	
Basic and diluted net loss per share 	 	 	(2.26	)	 	 	(1.65	)	 	 	(1.43	)	 	 	(1.27	)	 	 	(0.86	)	
Weighted average shares used in computing basic and diluted net loss per share 	 	 	16,158	 	 	 	13,449	 	 	 	13,004	 	 	 	12,839	 	 	 	7,589	 	

		December 31,	
			
		2001		2000		1999		1998		1997	

		(In thousands)	
Balance Sheet Data:	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
Working capital 	 	$	(1,829	)	 	$	(2,577	)	 	$	22,077	 	 	$	42,345	 	 	$	56,824	 	
Total assets 	 	 	39,904	 	 	 	21,288	 	 	 	45,364	 	 	 	57,914	 	 	 	66,950	 	
Noncurrent portion of capital lease and loan obligations 	 	 	2,228	 	 	 	4,722	 	 	 	5,221	 	 	 	4,479	 	 	 	613	 	
Note payable 	 	 	4,000	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	
Other non-current liabilities 	 	 	125	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	
Minority interest 	 	 	112	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	
      Factors that affected the comparability of information between 2000 and 2001 were the Company’s private placement in August of 2001 in which an aggregate of 3,040,734 shares of common stock and warrants to purchase an aggregate of 1,520,368 shares of common stock were sold for net proceeds of approximately $20.7 million, and the conversion of our loan from our Chairman’s first line of credit into 2,237,637 shares of common stock. 
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Item 7.     Management’s Discussion and Analysis of Financial Condition and Results of Operations 
      We have included or incorporated by reference into this Management’s Discussion and Analysis of Financial Condition and Results of Operations and elsewhere in this Annual Report on form 10-K, and from time to time our management may make, statements that constitute “forward-looking statements” as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by words including “anticipate,” “believe,” “intends,” “estimates,” “expect,” “should,” “may,” “potential” and similar expressions. Such statements are based on our management’s current expectations and involve risks and uncertainties. Actual results and performance could differ materially from those projected in the forward-looking statements as a result of many factors discussed in this Annual Report, including those set forth in Item 7 as well as under “Item 1. Business,” including “Risk Factors.” 
Critical Accounting Policies and Estimates 
      Our discussion and analysis of our operating results and financial condition is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of the financial statements requires us to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent amounts. While we believe our estimates, judgments, and assumptions are reasonable, the inherent nature of estimates is that actual results will likely be different from the estimates made. 
      We believe the following critical accounting policies, among others, affect the more significant judgments and estimates used in the preparation of our consolidated financial statements. 

	Revenue Recognition	
		
 	We recognize revenue when all of the following conditions have occurred: 	
			
 	• 	Persuasive evidence of an arrangement exists, 	
 		
 	• 	Delivery has occurred or services have been rendered, 	
 		
 	• 	The price is fixed and determinable, and 	
 		
 	• 	Collectibility is reasonably assured. 	
      We defer and recognize up-front refundable fees as revenues upon the later of when they become nonrefundable or when performance obligations are completed. In situations where we have no continuing performance obligations, we recognize up-front nonrefundable fees as revenues when receivable. In situations where continuing performance obligations exist, we defer and amortize up-front nonrefundable fees over the performance period. The terms of such arrangements may cause our operating results to vary considerably from period to period. 

	Income Taxes	
      Income taxes are accounted for under the asset and liability method pursuant to US Statement of Financial Accounting Standards (“SFAS”) Board Opinion No. 109. Under SFAS 109, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. 
      We record a valuation allowance to reduce deferred income tax assets to an amount that is more likely than not to be realized. Assessment of the realization of deferred income tax assets requires that estimates and assumptions be made as to the taxable income of future periods. Our deferred tax assets are reduced to zero, 
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as management believes that it is more likely than not that the deferred tax assets will not be realized. Projection of future period earnings is inherently difficult as it involves consideration of numerous factors such as our overall strategies and estimates of new product development and acceptance, product lifecycles, selling prices and volumes, responses by competitors, manufacturing costs and assumptions as to operating expenses and other industry specific and macro and micro economic factors. In addition, consideration is also given to ongoing and constantly evolving global tax laws and our own tax minimization strategies. 

	Capitalization of Software Developed for Internal Use	
      Hyseq accounts for software developed for internal use in accordance with Statement of Position (“SOP”) 98-1, “Accounting for the Costs of Computer Software Developed or Obtained for Internal Use,” which requires research and development costs associated with the application development stage to be capitalized for internal use software. Platform and software development costs incurred prior to the application development stage are charged to expense as incurred. Management is required to use professional judgment in determining whether development costs meet the criteria in SOP 98-1 for immediate expense or capitalization. Amortization of the capitalized costs begins when all substantial testing is completed and the software is ready for its intended use. Management periodically reviews the carrying value of the projects that have been capitalized to determine if impairment may exist. If it is determined that the carrying value of the asset has been impaired, the value would be reduced by a charge to operations in the amount of the impairment. 
Results of Operations 
     Contract Revenues 
      Comparison of Years Ended December 31, 2001 and 2000. Our contract revenues were $24.6 million for 2001 compared to $15.6 million for 2000. The increase was primarily due to higher revenues earned from our collaboration with BASF for gene screening services to target potential agricultural products. 
      Contract revenues earned during 2001 included $22.4 million under our agreement with BASF, $1.2 million under our agreement with Chiron, $0.8 million under our agreement with Affymetrix, and $0.2 million under our agreement with Applied Biosystems. 
      Revenues recognized under our agreement with BASF were $22.4 million for 2001 compared to $11.7 million for 2000. Processing was slightly ahead of contractual levels of 1.1 million average clones per month in 2001, compared to 0.6 million average clones per month in 2000 when processing was ramping up. 
      Revenues recognized in 2001 under our agreement with Chiron consist mainly of $1.0 million minimum annual research funding received for the second year of the two-year extension initiated by Chiron in May of 2000, compared to $3.3 million revenue in 2000 earned in the final months of the initial three year gene screening services portion of our agreement with Chiron. Chiron has the right to extend the agreement for one additional two-year period in May 2002 for a minimum of $1.0 million each year. 
      Our revenues typically vary from quarter to quarter and may result in significant fluctuations in our operating results from year to year. In the future, we may not be able to maintain existing collaborations, obtain additional collaboration partners or obtain revenue from other sources. The failure to maintain existing collaborations, the inability to enter into additional collaborative arrangements or obtain revenue from other sources could have a material adverse effect on our revenues and operating results. 
      Comparison of Years Ended December 31, 2000 and 1999. Our contract revenues increased by $9.2 million to $15.6 million in 2000, compared to $6.4 million for 1999. Contract revenues recognized in 2000 included $11.7 million from BASF and $3.3 million from Chiron. The increase in 2000 was due primarily to the ramp up of gene screening services for BASF, less a $1.6 million decrease in revenues earned from Chiron due the completion in the first half of 2000 of the gene screening services portion of that three year collaboration. 
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     Operating Expenses 
      Comparison of Years Ended December 31, 2001 and 2000. Our total operating expenses, consisting of research and development expenses and general and administrative expenses, increased by $22.5 million to $60.8 million for 2001 compared to $38.3 million for 2000. 
      For 2001, our research and development expenses increased by $17.5 million to $46.5 million compared to $29.0 million for 2000. This increase was primarily due to Hyseq’s biopharmaceutical research and development efforts, and includes a $3.3 million increase in costs associated with the addition of scientific personnel, $4.5 million increase in outside contract research services, and a $1.1 million write-off of certain capitalized software development costs. Due to the acquisition of additional facilities for research and development, rent expense increased $5.4 million and depreciation expense of leasehold improvements increased $1.1 million. 
      Our general and administrative expenses increased $4.1 million to $13.5 million in 2001 compared to $9.3 million in 2000. The increase in general and administrative expenses during 2001 included $3.4 million increase in personnel expenses in connection with the compensation, recruiting, and relocation of an experienced and accomplished senior management team. 
      We expect operating expenses to increase during 2002 as we plan to continue research and development of our therapeutic protein candidates, build out our new facilities to support our research and development efforts, further develop SBH technology applications through our subsidiary Callida, and prosecute our intellectual property rights. The magnitude of the increases in our operating expenses will be significantly affected by our ability to secure adequate sources of external financing or additional sources of revenue. If we do not obtain adequate financing or revenue in a timely manner, this could significantly harm our business, financial condition and results of operations, and may require us to delay or eliminate one or more of our research or development programs and/or delay the build out and occupation of our new leased facilities. See — “Liquidity and Capital Resources.” 
      Comparison of Years Ended December 31, 2000 and 1999. Our total operating expenses, consisting of research and development expenses and general and administrative expenses, increased by $12.0 million to $38.3 million for 2000 compared to $26.3 million for 1999. 
      For 2000, our research and development expenses increased by $10.8 million to $29.0 million compared to $18.2 million for 1999. This increase in our research and development expenses was primarily attributable to the increase in production throughput in our gene discovery and complete gene sequencing programs, including $5.1 million increase in costs associated with the addition of scientific and bioinformatic personnel, $1.9 million increase in outside contract services, $2.5 million increase in supplies purchases related to our collaborations, and a $0.6 million write-off of certain capitalized software development costs. 
      Our general and administrative expenses increased $1.2 million to $9.3 million in 2000 compared to $8.1 million in 1999. The increase in general and administrative expenses during 2000 included $0.8 million increase in rent expenses associated with the new leased facilities, $0.5 million increase in recruiting and salary expenses, plus increases in legal expenses related to our patent litigation and settlement with Affymetrix. 
     Interest Income and Expense, Net 
      Comparison of Years Ended December 31, 2001 and 2000. Our interest income and expense, net decreased by $1.1 million to $0.6 million interest expense for 2001 compared to $0.5 million interest income for 2000. This decrease in interest income resulted from lower average cash and investment balances and lower interest rates. 
      Comparison of Years Ended December 31, 2000 and 1999. Our interest income and expense, net decreased by $0.8 million to $0.5 million interest income for 2000 compared to $1.3 million interest income for 1999. This decrease in 2000 resulted from lower cash and investment balances, and higher interest expense from our increased equipment and leasehold financing activities. 
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     Net Loss 
      Since our inception, we have incurred net losses, and as of December 31, 2001, we had an accumulated deficit of $108.4 million. During 2001, we incurred a net loss of $36.5 million as compared to a $22.3 million net loss in 2000 and a net loss of $18.5 million in 1999. We expect to continue to incur significant net losses, which may increase substantially as we pursue research and development of our therapeutic protein candidates and other operations, and prosecute and enforce our intellectual property rights. 
     Loss Attributable To Minority Interest 
      Loss attributable to minority interest of $0.3 million is recorded for the portion of Callida’s losses attributable to minority stockholder Affymetrix. As the expected future level of Callida’s losses increases, we anticipate recording additional losses attributable to minority interest up to the point where Affymetrix’ initial minority interest investment is depleted. Beyond that point, the Company will absorb 100% of the net losses until Callida generates net income. 
Liquidity and Capital Resources 
      Our primary source of liquidity is cash from financing activities and from collaboration receipts. We generated cash of $44.3 million and $1.3 million from financing activities, and cash of $22.0 million and $15.6 million from collaboration receipts in 2001 and 2000, respectively. 
      Our primary use of capital resources is to fund operating activities and to acquire capital equipment and make leasehold improvements. We used cash of $21.5 million and $20.3 million for operating activities, and cash of $12.6 million and $8.3 million to acquire capital equipment and make leasehold improvements in 2001 and 2000, respectively. We expect operating expenses to increase during 2002, and will need additional funding in order to finance the expansion of our biopharmaceutical research and the build out of our new leased facilities to support such research. If we do not obtain adequate financing or collaboration receipts in a timely manner, this could significantly harm our business, financial condition, and results of operations, and may require us to delay and scale back one or more of our research or development programs, discontinue the build out of our new leased facilities, or relinquish greater rights to products at an earlier stage of development or on less favorable terms than we would otherwise seek to obtain, which could materially adversely affect our business, financial condition, and operating results. 
      Our future capital requirements and the adequacy of available funds will depend on many factors, including those set forth under Item 1, “Risk Factors — We Must Be Able to Continue to Secure Additional Financing” above. We may not be able to secure additional financing to meet our funding requirements on acceptable terms, if at all. If we raise additional funds by issuing equity securities, substantial dilution to our existing stockholders may result. If we are unable to obtain additional funds we may have to significantly curtail the scope of our operations. We have implemented a plan to delay, scale back or eliminate some of our operating expenditures, including facilities expansion plans, until we obtain additional funding. This plan includes a hiring freeze, a freeze on capital expenditures and a deferral of as many of our contractual financial commitments as possible. If we are unable to obtain financing, we may need to look to our Chairman to provide additional financing, which he has agreed to do. 
     Cash and Cash Equivalents and Short-Term Investments 
      Comparison of Years Ended December 31, 2001 and 2000. As of December 31, 2001, we had $12.3 million in cash and cash equivalents. These amounts reflect a net increase of $9.6 million from the $2.7 million in cash and cash equivalents we had as of December 31, 2000. This increase resulted primarily from the $20.0 million draw down of the first of our two lines of credit from our Chairman which was converted to common stock in March 2001, $20.7 million received from our August private stock offering net of offering expenses, and $8.0 million received from Affymetrix under the terms of our legal settlement and new collaboration, less cash used by operations of $21.5 million and capital spending of $12.6 million. 
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	Sources of Capital and Used of Capital	
      All of our investments in marketable securities have had maturities of less than one year, have been considered available-for-sale, and as such have been classified as short-term investments. We have held our cash equivalents and investments in investment-grade commercial paper, bank certificates of deposit and other interest-bearing securities. We make our investments in accordance with our investment policy. The primary objectives of our investment policy are liquidity, safety of principal and diversity of investments. At December 31, 2001, we did not hold any marketable securities. 
      In October 2001, as part of our reorganization and litigation settlement, Affymetrix gave us a total of $8.0 million in cash, which was comprised of two pieces: a license payment of $4.0 million dollars for granting Affymetrix a non-exclusive license under various U.S. patents and patent applications; and a loan to us of $4.0 million (interest rate of 7.5%, 5 year term) for Hyseq to invest in Callida. In lieu of repayment of this loan, we have the right, at any time, to exchange the note in whole or in part into such number of shares of our common stock (based on a price per share equal to 90% of the ten day trailing average price) equal to the aggregate amount of principal and interest to be exchanged. Our right to exchange the note into shares of common stock is subject to a number of conditions set forth in the note, including the requirements that the exchange of the note into our common stock does not cause Affymetrix to hold more than 19% of our outstanding common stock, and that there shall be an effective registration statement relating to the resale of the common stock issuable upon exchange of the note. 
      Both we and Affymetrix committed to invest additional amounts in N-Mer, contingent on Callida achieving certain milestones. Affymetrix has committed to lend us the additional amount that we have committed to invest in Callida, and we have the option to repay this loan with common stock. All outstanding principal and interest under the Affymetrix loan (and future loans) may become due and payable under specified conditions, including: upon the exercise by Affymetrix of its option to acquire N-Mer; upon a change in control of us; if our common stock ceases to be approved for quotation on Nasdaq or listed on a national securities exchange; in certain customary cases involving insolvency, bankruptcy or similar proceedings; that the aggregate amount outstanding under all loans exceeds 10% of our equity market capitalization; or if we end up in litigation with Affymetrix in the future. 
      In August 2001, we completed a private placement of approximately 3.04 million newly issued shares of common stock at $7.00 per share, together with warrants to purchase approximately 1.52 million shares of common stock, for aggregate gross proceeds of approximately $21.3 million ($20.7 million, net of offering expenses). The warrants are exercisable at any time through and including August 28, 2006 at $10.50 per share, a 50 percent premium to the per unit purchase price on the closing date, which may be adjusted to $7.95 per share based on certain future issuances. We may seek to raise funds through additional private placements in the future but cannot guarantee that we will be successful. 
      In August 2001, the Company received a commitment from the Chairman of its Board of Directors to provide a second line of credit of up to $20.0 million. A line of credit agreement was executed on August 6, 2001, and makes available the principal amount of $20.0 million, for draw down through August 5, 2003. Amounts outstanding under the line of credit are secured by a promissory note which bears interest at a rate equal to one percent (1%) above the prime rate, and will be payable in 48 equal monthly installments beginning August 5, 2003. Amounts outstanding may be repaid by conversion into shares of our common stock at any time upon the agreement of us and Dr. Rathmann at a price based upon the average price of the our common stock over the 20-day period prior to the conversion, or, if in connection with an equity financing, at the offering price. We may not repay more than $20 million in the form of shares of common stock. Under certain specified conditions, including (1) a change in control (based on a 50% ownership test), (2) insolvency or bankruptcy, or (3) a material adverse effect on our business, properties, assets or condition, we may not be able to borrow any further amounts under the line of credit. If any of the following events of default occurs, all payments under the promissory note may be accelerated: we shall fail to make payments within five business days of the date due; the breach by us of a representation or warranty made to Dr. Rathmann; the uncured breach by us of an obligation under the credit agreement; a material default by us under any other 
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agreement with Dr. Rathmann; and customary defaults related to our bankruptcy or insolvency. As of March 15, 2002, $16.0 million was available under this line of credit. 
      In April 2001, we leased an additional 138,698 square feet of space at 985 Almanor Avenue in Sunnyvale, California, adjacent to our current operating facilities. Lease payments over the ten-year term of the lease total approximately $54.1 million. Pursuant to the terms of the lease, we provided a letter of credit in the amount of $4.0 million as additional security for the lease; this letter of credit terminates after 5 years if we have not been in monetary default under the lease. Our Chairman provided the collateral for our letter of credit under this lease. This lease, as well as some of our other leases, contain customary event of default provisions, including that all payments due under the leases, such as amounts for unpaid rent and payments for future rent up to an amount of loss that we prove could have been reasonably avoided, will be accelerated upon the occurrences of events of default. Our lease obligations are further described in Item 2 “Properties,” and in Notes to Consolidated Financial Statements, Note 5 “Capital Lease and Loan Obligations.” 
      In August 2001, the terms of our Humboldt Court lease required us to provide a $2.0 million letter of credit. This letter of credit was provided in March 2002 and must be increased by $1.0 million annually in each of August 2002 and August 2003, after which it can decrease by $2.0 million in 2007. 
      In March 2001, our Board of Directors decided to complete the draw down of the balance of the $20.0 million available under the first line of credit from our Chairman, and pay off the outstanding principal balance in shares of our common stock, as provided in the agreement. As a consequence, we issued 2,237,637 shares of common stock to our Chairman in satisfaction of $20.0 million of outstanding principal under the line of credit. 
      We have $1.6 million in restricted cash on deposit as security for a $2.0 million letter of credit in conjunction with the 675 Almanor lease. Provided that no event of default under the lease occurs, the letter of credit and the cash collateralizing it will be reduced by $0.5 million per year in July 2002, July 2003, and July 2004. The cash on deposit at any time in conjunction with this letter of credit is restricted and cannot be withdrawn. We control the investment of the cash and receive the interest earned thereon. 
      As of December 31, 2001, our contractual payment obligations consist principally of lease payments as described in Item 2 “Properties” above and in the Notes to the Consolidated Financial Statements Note 5 “Capital Lease and Loan Obligations” and Note 6 “Commitments and Contingencies;” the loan repayment to Affymetrix and our contingent obligation to provide future funding to Callida described in the Notes to the Consolidated Financial Statements Note 7 “Collaborative Agreements;” and collaboration payments. Under the terms of our collaboration agreement with Deltagen, we will be obligated to pay $10.0 million over the next two years to fund the research work under the agreement. Under the terms of our collaboration agreement with Aurora, we may be obligated to pay up to $2.6 million over the next two years for work performed under that agreement. 
     Cash Used in Operating Activities 
      Comparison of Years Ended December 31, 2001 and 2000. The amount of net cash used in operating activities increased by $1.2 million to $21.5 million in 2001 from $20.3 million in 2000. This increase in cash used for operations in 2001 compared to 2000 was due primarily to increased research and development expenses related to our pharmaceutical product candidates, and the addition of new leased facilities for laboratory expansion, partially offset by an increase in current liabilities including a $2.5 million accrual for major contract services and for $3.2 million deferred revenues related to the Affymetrix collaboration. 
      Comparison of Years Ended December 31, 2000 and 1999. The amount of net cash used in operating activities increased by $8.4 million to $20.3 million in 2000 from $11.9 million in 1999. This increase in cash used in operations in 2000 compared to 1999 was due primarily to increased research and development expenses related to our pharmaceutical product candidates and our complete gene sequencing programs, and the addition of new leased facilities for laboratory expansion and payment of advanced rent for those lease facilities. 
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     Cash Provided by Investing Activities 
      Our investing activities, other than purchases and sales of short-term investments, have consisted primarily of capital expenditures. 
      Comparison of Years Ended December 31, 2001 and 2000. Net cash used in investing activities decreased by $21.2 million to $13.1 million used in 2001 by investing activities, compared to $8.1 million provided in 2000 by investing activities. The decrease was primarily due to no new net redemptions of investments in 2001, compared with $17.0 million net redemptions of short-term investments in 2000. Capital expenditures increased by $4.3 million to $12.6 million in 2001, primarily due to leasehold improvements, compared with $8.3 million in 2000. 
      Comparison of Years Ended December 31, 2000 and 1999. Net cash provided by investing activities increased by $5.7 million to $8.1 million in 2000 compared to $2.4 million in 1999. The increase was primarily due to higher net redemptions of short-term investments in 2000, partially offset by higher purchases of equipment used to support our expanding research and development activities and investment in capitalized software. In 2000, all of our short-term investments were reinvested upon maturity into commercial paper with maturities of less than 90 days. 
     Cash Provided by Financing Activities 
      Comparison of Years Ended December 31, 2001 and 2000. Net cash provided by financing activities increased to $44.3 million in 2001 compared to $1.3 million in 2000. The increase was primarily due to the draw down of the first of two $20.0 million lines of credit from the Chairman of our Board of Directors, the completion of a private stock placement from which the Company received net proceeds of $20.7 million, and a $4.0 loan from Affymetrix as part of the Callida collaboration. The increase was partially offset by payments on existing capital lease and loan obligations. 
      As of December 31, 2001, minority interest was $0.1 million. Minority interest is related to the establishment of Callida in October 2001, a majority-owned subsidiary, and reflects the initial minority shareholders’ capitalization less the minority shareholders’ portion of the net losses incurred to date. 
      Comparison of Years Ended December 31, 2000 and 1999. Net cash provided by financing activities decreased slightly to $1.3 million in 2000 compared to $1.6 million in 1999. The decrease was primarily due to lower proceeds from financing arrangements, partially offset by higher proceeds from employee stock option exercises and higher payments on loan obligations. In 2000, we borrowed the remaining $2.0 million of a $5.0 million asset-backed financing commitment obtained in 1999. 
     Disclosure Regarding Our Chairman 
      In November 2000, we received a commitment from Dr. Rathmann to provide a line of credit of up to $20.0 million in aggregate principal amount. The promissory note under the line of credit relating to outstanding amounts was convertible at our option into shares of our common stock at fair market value. On March 20, 2001 we drew down the entire $20.0 million amount and, following ratification of the transaction by our stockholders at last year’s annual meeting, we converted the note for the entire amount into 2,237,637 shares of our common stock. 
      In August 2001, we received a commitment from Dr. Rathmann to provide a second line of credit of up to $20.0 million in aggregate principal amount, available for draw down through August 5, 2003. Amounts outstanding under the line of credit bear interest at prime plus 1% and are payable in 48 equal monthly installments beginning upon the expiration date of August 5, 2003. The promissory note issued pursuant to the line of credit may be repaid by converting into shares of our common stock at any time upon the agreement of us and Dr. Rathmann at a price based upon the average price of our common stock over the 20-day period prior to the conversion or, if in connection with an equity financing, at the offering price. In February 2002, we drew down $4.0 million under the line of credit. 
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      Dr. Rathmann guaranteed to a certain maximum amount and provided the collateral for our $4.0 million letter of credit under our 985 Almanor lease, and our $2.0 million letter of credit under our Humboldt Court lease. 
      On February 1, 2000, our Board of Directors granted Dr. Rathmann an option to purchase 1,000,000 shares of our common stock for services as Chairman of the Board, at an exercise price equal to the then-current market price on the day before the date of grant of $31.688 per share, which option vests and becomes exercisable over two years at a rate of one-third upon grant and one-third on each yearly anniversary thereafter. The term of the option is ten years. On August 21, 2001, our Board of Directors granted Dr. Rathmann an option to purchase 1,000,000 shares of our common stock, for services as Chairman of the Board at an exercise price equal to the then-current market price of $8.635 per share. This option has a ten year term, and vests and becomes exercisable over four years at a rate of one-fourth upon the one year anniversary of the date of grant and 1/48th of the total number of shares upon each monthly anniversary thereafter. In the event of a change in control of our company, the option shall become immediately exercisable. Upon the termination of Dr. Rathmann’s directorship with us for any reason or no reason, except as a result of Dr. Rathmann’s death or disability, the unvested portion of the option shall be forfeited, and the vested unexercised portion of the option shall be exercisable for a period of thirty days following termination or the expiration of the term of the option if earlier. The option shall be exercisable by Dr. Rathmann or his legal representative, and in the event of his death only by his beneficiary. The option shall not otherwise be transferable by Dr. Rathmann or by operation of law, and any attempted transfer or other disposition of the option shall be void and shall result in the cancellation of the option. Our Board of Directors has the right to amend or terminate the provisions of the option in any manner it may deem necessary or advisable to carry out the purpose of the grant as the result of, or to comply with, any change in applicable regulations, interpretation or statutory enactment. 
      Dr, Rathmann receives no cash compensation as an employee and instead receives options to purchase 3,000 shares per month. To date, at Dr. Rathmann’s request, we have not granted him any equity incentives in recognition of the lines of credits that he has made available to us, his guarantee of our real estate leases, his provision of collateral for two of our letters of credit under facilities leases, or the occasional use of his private jet for our business purposes. We believe that the Board is likely to take action in the future to provide appropriate incentives to Dr. Rathmann in order to ensure his continued active involvement with us. 
     Recent Accounting Pronouncements 
      In June 2001, the Financial Accounting Standards Board (or FASB) issued Statement of Financial Accounting Standards (or SFAS) No. 141, “Business Combinations”, which requires that all business combinations be accounted for under the purchase method of accounting. This statement is effective for all business combinations initiated after June 30, 2001. Implementation of SFAS No. 141 will not have a material effect on the Company’s results of operations or financial position. 
      In June 2001, the FASB issued SFAS No. 142, “Goodwill and Other Intangible Assets.” This statement applies to intangibles and goodwill acquired after June 30, 2001, as well as goodwill and intangibles previously acquired. Under this statement, goodwill, as well as other intangibles determined to have an infinite life, will no longer be amortized; however, these assets will be reviewed for impairment on a periodic basis. This statement became effective January 1, 2002. Implementation of SFAS No. 142 will not have a material effect on the Company’s results of operations or financial position. 
      In June 2001, the FASB issued SFAS No. 143, “ Accounting for Asset Retirement Obligations.” SFAS No. 143 requires liability recognition for obligations associated with the retirement of tangible long-lived asset and the associated asset retirement costs. The Company is required to adopt the provisions of SFAS No. 143 effective January 1, 2003, with earlier application encouraged. Implementation of SFAS 143 will not have a material effect on the Company’s results of operations or financial position. 
      In August 2001, the FASB issued SFAS No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets.” SFAS No. 144 supersedes SFAS No. 121, “Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of”, in that it removes goodwill from its impairment scope 
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and allows for different approaches in cash flow estimation. However, SFAS No. 144 retains the fundamental provisions of SFAS No. 121 for (a) recognition and measurement of long-live assets to be held and used and (b) measurement of ling-lived assets to be disposed of. SFAS No. 144 also supersedes the business segment concept in APB Opinion No. 30, “Reporting the Results of Operations-Reporting the Effects of Disposal of a Segment of a Business, and Extraordinary, Unusual and Infrequently Occurring Events and Transactions,” in that it permits presentation of a component of an entity, whether classified as held for sale or disposed of, as a discontinued operation. However, SFAS No. 144 retains the requirement of APB Opinion No. 30 to report discontinued operations separately from continuing operations. The Company was required to adopt the provision of SFAS No. 144 effective January 1, 2002. Implementation of SFAS 144 is not expected to have a material effect on the Company’s results of operations or financial position. 
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Item 7A.     Qualitative and Quantitative Disclosures About Market Risk 
Market Rate Risk 
      We have exposure to changes in interest rates in our cash equivalents, which are held primarily in money market accounts which earn interest at variable rates. We do not use derivative financial instruments in our investment portfolio. We place our investments with high quality issuers and, by policy, limit the amount of credit exposure to any one issuer. We are averse to principal loss and ensure the safety and preservation of our invested funds by limiting default, market and reinvestment risk. The recorded carrying amounts of our cash equivalents approximate fair value due to their short-term maturities. 
      We also have exposure to changes in interest rates in our line of credit with our Chairman, which bears interest at the prime rate plus one percentage point. See Note 10 of Notes to Consolidated Financial Statements. Our interest rate exposure is mitigated by our ability to repay amounts outstanding under the line of credit with our common stock. 
      Changes in interest rates do not affect interest income on our restricted cash as it is maintained in commercial paper with fixed rates and maturities of less than 90 days. 
      Changes in interest rates do not affect interest expense on our lease obligations as they bear fixed rates of interest. 
      Changes in interest rates do not affect our note payable as it bears fixed rate of interest. 
      The table below presents the amounts and related interest rates of our cash equivalents, restricted cash, lease obligations, line of credit, and note payable at December 31, 2001 and 2000: 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
		2000		2000		2001		2001	
		Average		Carrying		Average		Carrying	
		Rate		Amount		Rate		Amount	
									
				(In thousands)				(In thousands)	
Cash equivalents 	 	 	5.50	%	 	$	2,699	 	 	 	3.17	%	 	$	12,329	 	
Restricted cash 	 	 	6.42	%	 	$	2,106	 	 	 	4.52	%	 	$	1,606	 	
Lease obligation 	 	 	11.90	%	 	$	7,100	 	 	 	11.60	%	 	$	4,734	 	
Line of credit 	 	 	N/A	%	 	$	—	 	 	 	N/A	%	 	$	—	 	
Note payable 	 	 	N/A	%	 	$	—	 	 	 	7.50	%	 	$	4,000	 	
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Item 8.     Financial Statements and Supplementary Data 
      Hyseq, Inc.’s financial statements and notes thereto appear on pages 43 to 64 of this Annual Report on Form 10-K. 
 	 	 	 	 	
		Page	
		No.	
			
Independent Auditors’ Report KPMG LLP 	 	 	44	 	
Report of Ernst & Young LLP, Independent Auditors’ 	 	 	45	 	
Consolidated Balance Sheets as of December 31, 2001 and 2000 	 	 	46	 	
Consolidated Statements of Operations for the years ended December 31, 2001, 2000 and 1999 	 	 	47	 	
Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2001, 2000 and 1999 	 	 	48	 	
Consolidated Statements of Cash Flows for the years ended December 31, 2001, 2000 and 1999 	 	 	49	 	
Notes to Consolidated Financial Statements 	 	 	50	 	
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INDEPENDENT AUDITORS’ REPORT 
The Board of Directors and Stockholders of 
Hyseq, Inc.: 
      We have audited the accompanying consolidated balance sheets of Hyseq, Inc. and subsidiary as of December 31, 2001 and 2000 and the related consolidated statements of operations, stockholders’ equity and cash flows for the years then ended. These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. 
      We conducted our audits in accordance with auditing standards generally accepted in the United States of America. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. 
      In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Hyseq, Inc. and subsidiary as December 31, 2001 and 2000 and the consolidated results of their operations and their cash flows for the years then ended, in conformity with accounting principles generally accepted in the United States of America. 
		
 	/s/ KPMG LLP 	
San Francisco, California 
February 5, 2002 
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REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS 
The Board of Directors and Stockholders 
Hyseq, Inc.: 
      We have audited the accompanying consolidated statements of operations, stockholders’ equity and cash flows of Hyseq, Inc. for the year ended December 31, 1999. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audit. 
      We conducted our audit in accordance with auditing standards generally accepted in the United States. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion. 
      In our opinion, based on our audit, the consolidated financial statements referred to above present fairly, in all material respects, the consolidated results of operations and cash flows for Hyseq, Inc. for the year ended December 31, 1999, in conformity with accounting principles generally accepted in the United States. 
		
 	/s/ ERNST & YOUNG LLP 	
Palo Alto, California 
February 2, 2000 
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HYSEQ PHARMACEUTICALS, INC. 
CONSOLIDATED BALANCE SHEETS 
(In thousands, except share information) 

		At December 31,	
			
		2001		2000	

		(In thousands, except	
		share information)	
ASSETS	
Cash and cash equivalents 	 	$	12,329	 	 	$	2,699	 	
Accounts receivable 	 	 	53	 	 	 	22	 	
Prepaid rent 	 	 	1,890	 	 	 	2,224	 	
Contract revenue receivable 	 	 	1,037	 	 	 	—	 	
Other current assets 	 	 	992	 	 	 	682	 	
 	 	 		 	 	 		 	
 	 	Total current assets 	 	 	16,301	 	 	 	5,627	 	
Cash on deposit 	 	 	1,606	 	 	 	2,106	 	
Equipment, leasehold improvements and capitalized software, net 	 	 	18,988	 	 	 	12,465	 	
Patents, licenses and other assets, net 	 	 	3,009	 	 	 	1,090	 	
 	 	 		 	 	 		 	
 	 	Total assets 	 	$	39,904	 	 	$	21,288	 	
 	 	 		 	 	 		 	
LIABILITIES AND STOCKHOLDERS’ EQUITY	
Accounts payable 	 	$	3,210	 	 	$	1,979	 	
Accrued professional fees, other 	 	 	928	 	 	 	833	 	
Accrued bonus 	 	 	1,833	 	 	 	—	 	
Accrued license fee 	 	 	2,500	 	 	 	—	 	
Deferred rent 	 	 	1,608	 	 	 	231	 	
Deferred revenue 	 	 	3,702	 	 	 	1,798	 	
Current portion of capital lease and loan obligations 	 	 	2,506	 	 	 	2,379	 	
Other current liabilities 	 	 	1,731	 	 	 	984	 	
 	 	 		 	 	 		 	
 	 	Total current liabilities 	 	 	18,018	 	 	 	8,204	 	
Noncurrent portion of capital lease and loan obligations 	 	 	2,228	 	 	 	4,722	 	
Other noncurrent liabilities 	 	 	125	 	 	 	—	 	
Note Payable 	 	 	4,000	 	 	 	—	 	
 	 	 		 	 	 		 	
 	 	Total liabilities 	 	 	24,371	 	 	 	12,926	 	
 	 	 		 	 	 		 	
Minority interest 	 	 	112	 	 	 	—	 	
Commitments and contingencies 	 	 	 	 	 	 	 	 	
Stockholders’ equity: 	 	 	 	 	 	 	 	 	
 	Preferred stock, par value $0.001; 8,000,000 shares authorized; none issued and outstanding as of December 31, 2001 and 2000 	 	 	—	 	 	 	—	 	
 	Common stock, par value $0.001; 100,000,000 shares authorized; 19,307,735 and 13,722,388 issued and outstanding as of December 31, 2001 and 2000, respectively 	 	 	19	 	 	 	14	 	
 	Additional paid-in capital 	 	 	123,849	 	 	 	80,278	 	
 	Deferred stock compensation 	 	 	(53	)	 	 	(8	)	
 	Accumulated deficit 	 	 	(108,394	)	 	 	(71,922	)	
 	 	 		 	 	 		 	
 	 	Total stockholders’ equity 	 	 	15,421	 	 	 	8,362	 	
 	 	 		 	 	 		 	
 	 	Total liabilities and stockholders’ equity 	 	$	39,904	 	 	$	21,288	 	
 	 	 		 	 	 		 	
See accompanying Notes to Consolidated Financial Statements. 
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HYSEQ PHARMACEUTICALS, INC. 
CONSOLIDATED STATEMENTS OF OPERATIONS 
(In thousands, except per share data) 

		Year Ended December 31,	
			
		2001		2000		1999	

		(In thousands, except per share data)	
Contract revenues 	 	$	24,590	 	 	$	15,604	 	 	$	6,397	 	
 	 	 		 	 	 		 	 	 		 	
Operating expenses: 	 	 	 	 	 	 	 	 	 	 	 	 	
 	Research and development 	 	 	46,506	 	 	 	29,018	 	 	 	18,157	 	
 	General and administrative 	 	 	13,452	 	 	 	9,315	 	 	 	8,101	 	
 	Restructuring 	 	 	825	 	 	 	—	 	 	 	—	 	
 	 	 		 	 	 		 	 	 		 	
 	 	Total operating expenses 	 	 	60,783	 	 	 	38,333	 	 	 	26,258	 	
 	 	 		 	 	 		 	 	 		 	
Loss from operations 	 	 	(36,193	)	 	 	(22,729	)	 	 	(19,861	)	
Interest income 	 	 	319	 	 	 	1,347	 	 	 	2,004	 	
Interest expense 	 	 	(891	)	 	 	(871	)	 	 	(690	)	
 	 	 		 	 	 		 	 	 		 	
Loss before minority interest 	 	 	(36,765	)	 	 	(22,253	)	 	 	(18,547	)	
Loss attributable to minority interest 	 	 	293	 	 	 	—	 	 	 	—	 	
 	 	 		 	 	 		 	 	 		 	
Net loss 	 	$	(36,472	)	 	$	(22,253	)	 	$	(18,547	)	
 	 	 		 	 	 		 	 	 		 	
Basic and diluted net loss per share 	 	$	(2.26	)	 	$	(1.65	)	 	$	(1.43	)	
 	 	 		 	 	 		 	 	 		 	
Weighted average shares used in computing basic and diluted net loss per share 	 	 	16,158	 	 	 	13,449	 	 	 	13,004	 	
 	 	 		 	 	 		 	 	 		 	
See accompanying Notes to Consolidated Financial Statements. 
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HYSEQ PHARMACEUTICALS, INC. 
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY 
For the Years Ended December 31, 2001, 2000 and 1999 
(In thousands, except share data) 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
						Notes				Accumulated					
		Common Stock		Additional		Receivable				Other				Total	
				Paid-in		from		Deferred		Comprehensive		Accumulated		Stockholders’	
		Shares		Amount		Capital		Stockholders		Compensation		Loss		Deficit		Equity	

		(In thousands, except share data)	
Balance at December 31, 1998	 	 	12,931	 	 	$	13	 	 	$	82,328	 	 	$	(3,503	)	 	$	(126	)	 	$	(14	)	 	$	(31,122	)	 	$	47,576	 	
Issuance of common stock upon exercise of stock options and under Employee Stock Purchase Plan 	 	 	152	 	 	 	—	 	 	 	122	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	122	 	
Amortization of deferred compensation 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	89	 	 	 	—	 	 	 	—	 	 	 	89	 	
Comprehensive loss: 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	Net loss 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	(18,547	)	 	 	(18,547	)	
 	Other comprehensive income (loss) 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	(18	)	 	 	—	 	 	 	(18	)	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Comprehensive loss 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	(18,565	)	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Balance at December 31, 1999	 	 	13,083	 	 	$	13	 	 	$	82,450	 	 	$	(3,503	)	 	$	(37	)	 	$	(32	)	 	$	(49,669	)	 	$	29,222	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Issuance of common stock upon exercise of stock options and under Employee Stock Purchase Plan 	 	 	560	 	 	 	1	 	 	 	1,481	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	1,482	 	
Issuance of common stock upon cash exercise of warrants 	 	 	1	 	 	 	—	 	 	 	6	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	6	 	
Issuance of common stock upon cashless exercise of warrants 	 	 	149	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	
Compensation expense related to SAB option grants 	 	 	—	 	 	 	—	 	 	 	157	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	157	 	
Notes receivable from stockholders repaid by surrendering shares of stock 	 	 	(71	)	 	 	—	 	 	 	(3,816	)	 	 	3,503	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	(313	)	
Amortization of deferred compensation 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	29	 	 	 	—	 	 	 	—	 	 	 	29	 	
Comprehensive loss: 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	Net loss 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	(22,253	)	 	 	(22,253	)	
 	Other comprehensive income (loss) 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	32	 	 	 	—	 	 	 	32	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Comprehensive loss 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	(22,221	)	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Balance at December 31, 2000	 	 	13,722	 	 	$	14	 	 	$	80,278	 	 	$	—	 	 	$	(8	)	 	$	—	 	 	$	(71,922	)	 	$	8,362	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Issuance of common stock upon exercise of stock options and under Employee Stock Purchase Plan 	 	 	140	 	 	 	—	 	 	 	848	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	848	 	
Compensation expense related to vesting acceleration 	 	 	—	 	 	 	—	 	 	 	30	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	30	 	
Issuance of common stock upon cash exercise of warrants 	 	 	167	 	 	 	—	 	 	 	574	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	574	 	
Issuance of common stock through PIPE in August, 2001, net issuance cost of ($548) 	 	 	3,040	 	 	 	3	 	 	 	20,734	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	20,737	 	
Conversion of line of credit into common stock 	 	 	2,238	 	 	 	2	 	 	 	19,998	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	20,000	 	
Gain on sale of 10% interest in Callida 	 	 	—	 	 	 	—	 	 	 	1,308	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	1,308	 	
Deferred compensation related to SAB option grants 	 	 	—	 	 	 	—	 	 	 	79	 	 	 	—	 	 	 	(79	)	 	 	—	 	 	 	—	 	 	 	—	 	
Amortization of deferred compensation 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	—	 	 	 	34	 	 	 	—	 	 	 	—	 	 	 	34	 	
 	Net loss 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	(36,472	)	 	 	(36,472	)	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Balance at December 31, 2001	 	 	19,307	 	 	$	19	 	 	$	123,849	 	 	$	—	 	 	$	(53	)	 	$	—	 	 	$	(108,394	)	 	$	15,421	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
See accompanying Notes to Consolidated Financial Statements. 
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HYSEQ PHARMACEUTICALS, INC. 
CONSOLIDATED STATEMENTS OF CASH FLOWS 
(In thousands) 

		Year Ended December 31,	
			
		2001		2000		1999	

		(In thousands)	
Cash flows from operating activities:	 	 	 	 	 	 	 	 	 	 	 	 	
 	Net loss 	 	$	(36,472	)	 	$	(22,253	)	 	$	(18,547	)	
 	Adjustments to reconcile net loss to net cash used in operating activities: 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	Depreciation and amortization 	 	 	5,070	 	 	 	3,095	 	 	 	2,876	 	
 	 	Loss attributable to minority interest 	 	 	(293	)	 	 	—	 	 	 	—	 	
 	 	Stock compensation expense 	 	 	30	 	 	 	157	 	 	 	—	 	
 	 	Amortization of deferred stock compensation 	 	 	34	 	 	 	29	 	 	 	89	 	
 	 	Non-cash change in deferred revenue 	 	 	(24,195	)	 	 	(11,954	)	 	 	—	 	
 	 	Loss on disposal of assets 	 	 	—	 	 	 	578	 	 	 	—	 	
 	 	Loss on impairment of capitalized software 	 	 	1,087	 	 	 	—	 	 	 	—	 	
 	 	Realized gain (loss) on short-term investments 	 	 	—	 	 	 	—	 	 	 	(18	)	
 	 	Other non-cash items 	 	 	238	 	 	 	—	 	 	 	—	 	
 	 	Changes in operating assets and liabilities: 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	 	Accounts receivable 	 	 	(31	)	 	 	1,228	 	 	 	(599	)	
 	 	 	Prepaid rent 	 	 	334	 	 	 	(2,107	)	 	 	(11	)	
 	 	 	Contract revenue 	 	 	(1,037	)	 	 	—	 	 	 	—	 	
 	 	 	Other current assets 	 	 	(310	)	 	 	17	 	 	 	18	 	
 	 	 	Deferred revenue 	 	 	26,099	 	 	 	10,666	 	 	 	5,000	 	
 	 	 	Accounts payable 	 	 	1,231	 	 	 	506	 	 	 	(432	)	
 	 	 	Accrued professional fees 	 	 	95	 	 	 	(945	)	 	 	203	 	
 	 	 	Accrued bonus 	 	 	1,833	 	 	 	(145	)	 	 	145	 	
 	 	 	Accrued license fee 	 	 	2,500	 	 	 	—	 	 	 	—	 	
 	 	 	Deferred rent 	 	 	1,377	 	 	 	84	 	 	 	69	 	
 	 	 	Other current liabilities 	 	 	747	 	 	 	696	 	 	 	(659	)	
 	 	 	Other non-current liabilities 	 	 	125	 	 	 	—	 	 	 	—	 	
 	 	 		 	 	 		 	 	 		 	
 	 	 	 	Net cash used in operating activities 	 	 	(21,538	)	 	 	(20,348	)	 	 	(11,866	)	
 	 	 		 	 	 		 	 	 		 	
Cash flows from investing activities:	 	 	 	 	 	 	 	 	 	 	 	 	
 	Purchases of property and equipment 	 	 	(12,582	)	 	 	(8,269	)	 	 	(4,374	)	
 	Purchases of short-term investments 	 	 	—	 	 	 	(57,101	)	 	 	(16,382	)	
 	Maturities of short-term investments 	 	 	—	 	 	 	74,095	 	 	 	24,300	 	
 	Intangible and other assets 	 	 	(542	)	 	 	(639	)	 	 	(1,158	)	
 	Proceeds from sale of fixed assets 	 	 	—	 	 	 	9	 	 	 	—	 	
 	 	 		 	 	 		 	 	 		 	
 	 	 	 	Net cash (used in) provided by investing activities 	 	 	(13,124	)	 	 	8,095	 	 	 	2,386	 	
 	 	 		 	 	 		 	 	 		 	
Cash flows from financing activities:	 	 	 	 	 	 	 	 	 	 	 	 	
 	Proceeds from financing arrangements and loans 	 	 	4,000	 	 	 	2,073	 	 	 	3,001	 	
 	Proceeds from release of cash on deposit 	 	 	500	 	 	 	—	 	 	 	—	 	
 	Payment on capital lease and loan obligations 	 	 	(2,367	)	 	 	(2,283	)	 	 	(1,523	)	
 	Repurchases of common stock 	 	 	—	 	 	 	—	 	 	 	(115	)	
 	Proceeds from line of credit 	 	 	20,000	 	 	 	—	 	 	 	—	 	
 	Proceeds from issuance of common stock (PIPE), net of issuance costs 	 	 	20,737	 	 	 	—	 	 	 	—	 	
 	Proceeds from issuance of common stock upon the exercise of options,
warrants and Employee Stock Purchase Plan 	 	 	1,422	 	 	 	1,487	 	 	 	237	 	
 	 	 		 	 	 		 	 	 		 	
 	 	 	 	Net cash provided by financing activities 	 	 	44,292	 	 	 	1,277	 	 	 	1,600	 	
 	 	 		 	 	 		 	 	 		 	
Net decrease in cash 	 	 	9,630	 	 	 	(10,976	)	 	 	(7,880	)	
Cash and cash equivalents at beginning of year 	 	 	2,699	 	 	 	13,675	 	 	 	21,555	 	
 	 	 		 	 	 		 	 	 		 	
Cash and cash equivalents at end of year 	 	$	12,329	 	 	$	2,699	 	 	$	13,675	 	
 	 	 		 	 	 		 	 	 		 	
Supplemental disclosures of cash flow information:	 	 	 	 	 	 	 	 	 	 	 	 	
 	Interest paid 	 	$	739	 	 	$	868	 	 	$	690	 	
 	 	 		 	 	 		 	 	 		 	
 	Noncash investing and financing activities: 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	Cashless exercise of stock options 	 	$	—	 	 	$	687	 	 	$	—	 	
 	 	 		 	 	 		 	 	 		 	
 	 	Cashless exercise of warrants 	 	$	—	 	 	$	745	 	 	$	206	 	
 	 	 		 	 	 		 	 	 		 	
 	 	Sale of interest in subsidiary in exchange for intellectual property 	 	$	1,713	 	 	$	—	 	 	$	—	 	
 	 	 		 	 	 		 	 	 		 	
 	 	Conversion of line of credit to common stock 	 	$	20,000	 	 	$	—	 	 	$	—	 	
 	 	 		 	 	 		 	 	 		 	
See accompanying Notes to Consolidated Financial Statements. 
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1.	Organization and Summary of Significant Accounting Policies	

	Organization	
      Hyseq, Inc. (the Company or Hyseq) was established in August 1992 as an Illinois corporation and subsequently reincorporated as a Nevada corporation on November 12, 1993. On October 24, 2001 the Company began doing business as Hyseq Pharmaceuticals, Inc. The Company’s wholly owned subsidiary, Hyseq Diagnostics, Inc., was formed as a Nevada corporation on July 18, 1995 and is inactive. The Company’s prior wholly owned subsidiary, GeneSolutions Inc., was formed as a Nevada corporation on July 23, 1999 and was merged into the Company on January 8, 2002. The Company’s majority-owned subsidiary, Callida Genomics, Inc., was formed as a Delaware corporation on October 24, 2001 to carry out the Company’s business relating to sequencing-by-hybridization (SBH) technology. Callida Genomics’ wholly owned subsidiary, N-Mer, Inc., was formed as a Delaware corporation on October 24, 2001 to collaborate with Affymetrix, Inc (See Note 8). 
      Hyseq researches and develops biopharmaceutical products from its collection of novel genes discovered using its high-throughput screening signature-by-hybridization platform, related to its proprietary sequencing-by-hybridization technology. Hyseq has collaborations for conducting research and development on gene-based products and collaboration with Amgen to develop alfimeprase, a thrombolytic enzyme for PAO and other indications. 

	Principles of Consolidation and Basis of Presentation	
      The consolidated financial statements include the accounts of Hyseq Pharmaceuticals and Callida Genomics, our majority owned subsidiary. All significant intercompany transactions and accounts have been eliminated in consolidation. Upon consolidation, 10% of the losses in Callida are excluded from Hyseq’s consolidated results and are allocated to the minority interest holder Affymetrix up to the point where Affymetrix’s initial investment is depleted. Beyond that point, the Company will absorb 100% of the net losses until Callida generates net income. 

	Use of Estimates	
      The preparation of the financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. 

	Cash and Cash Equivalents	
      Cash equivalents consist primarily of money market accounts, commercial paper and certificates of deposit with original maturities of three months or less. This is consistent with the Company’s policy to maintain high liquidity and ensure safety of principal. 

	Equipment, Leasehold Improvements, and Capitalized Software	
      Equipment, leasehold improvements, and capitalized software are recorded at cost. Equipment under capital leases is recorded at the lower of the net present value of the minimum lease payments required over the term of the lease or the fair value of the assets at the inception of the lease. Additions, renewals and betterments that significantly extend the life of an asset are capitalized. Minor replacements, maintenance, and repairs are charged to operations as incurred. Equipment is depreciated over the estimated useful lives of the related assets, ranging from three to five years, using the straight-line method. Equipment under capital leases is amortized over the shorter of the estimated useful life or the terms of the lease, using the straight-line method. Leasehold improvements are amortized over the shorter of the estimated life or the term of the lease, using the straight-line method. Capitalized software is amortized over the shorter of the estimated useful life 
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 
or two years, using the straight-line method. When assets are retired or otherwise disposed of, the assets and related accumulated depreciation or amortization are eliminated from the accounts and any resulting gain or loss is reflected in income. 
     Impairment of Long-Lived Assets 
      Periodically, management determines whether any property and equipment or any other assets have been impaired based on the criteria established in Statement of Financial Accounting Standards No. 121, “Accounting for the Impairment of Long-Lived Assets and Long-Lived Assets to be Disposed Of” (“SFAS No. 121”). 
     Revenue Recognition 
      Revenues are recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed and determinable and collectibility is reasonably assured. Revenues related to collaborative research agreements and government grants are generally recognized over the related funding periods for each contract as the services are performed. Nonrefundable up-front payments received in connection with collaborative research agreements where the Company has no continuing performance obligation are recognized when receivable and collectibility is reasonably assured. When a continuing performance obligation exists, these revenues are deferred and recognized over the relevant periods of service, generally the research term. 
      Revenues from collaborative agreements representing 10% or more of total revenue are as follows: 

		Year Ended December 31,	
			
		2001		2000		1999	
							
Source: 	 	 	 	 	 	 	 	 	 	 	 	 	
 	BASF Plant Sciences GmbH 	 	 	91	%	 	 	75	%	 	 	*	 	
 	Chiron Corporation 	 	 	*	 	 	 	21	%	 	 	76	%	
 	Kirin Brewery Co. Ltd 	 	 	*	 	 	 	*	 	 	 	19	%	

* 	less than 10% 	
     Revenues by Geographic Area 
      Revenues by geographic area are based on customers’ country of domicile rather than customer’s shipping locations: 

		Year Ended December 31,	
			
		2001		2000		1999	

		(In thousands)	
Revenues: 	 	 	 	 	 	 	 	 	 	 	 	 	
 	Domestic 	 	$	2,230	 	 	$	3,639	 	 	$	5,178	 	
 	Germany 	 	 	22,360	 	 	 	11,665	 	 	 	19	 	
 	Japan 	 	 	—	 	 	 	300	 	 	 	1,200	 	
 	 	 		 	 	 		 	 	 		 	
 	 	Total revenues 	 	$	24,590	 	 	$	15,604	 	 	$	6,397	 	
 	 	 		 	 	 		 	 	 		 	
     Stock-Based Compensation 
      In accordance with the provisions of Statement of Financial Accounting Standards No. 123 (SFAS No. 123), “Accounting for Stock-Based Compensation” the Company has elected to account for stock-based 
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 
compensation to employees under the provisions of Accounting Principles Board Opinion No. 25, “Accounting for Stock Issued to Employees,” and its related interpretations, and to adopt the “disclosure only” alternative described in SFAS No. 123. Stock options granted to non-employees are accounted for in accordance with SFAS No. 123 and Emerging Issues Task Force No. 96-18, “Accounting for Equity Instruments that Are Issued to Other than Employees for Acquiring, or in Conjunction with Selling, Goods or Services.” 
     Research and Development 
      Research and development costs are expensed to operations as incurred and include costs related to the Company’s collaborations. Research costs related to collaborations were approximately $13.0 million, $10.4 million and $7.0 million in 2001, 2000 and 1999, respectively. 
     Net Loss per Share 
      Basic and diluted net loss per share are presented in conformity with the Statement of Financial Accounting Standards No. 128 (SFAS No. 128), “Earnings Per Share” for all periods presented. In accordance with SFAS No. 128, basic and diluted net loss per share has been computed using the weighted average number of shares of common stock outstanding during the period. 
      In 2001, 2000 and 1999, outstanding options and warrants of 730,051, 1,513,000 and 369,000 shares, respectively, (as determined using the treasury stock method) were not included as they were antidilutive. 
     Segment Reporting 
      To date, the Company has viewed its operations as principally one segment. Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision maker in making decisions how to allocate resources and assess performance. The Company’s chief operating decision maker is the Chief Executive Officer. As a result, the financial information disclosed herein materially represents all of the financial information related to the Company’s principal operating segment. 
2.     Equipment, Leasehold Improvements and Capitalized Software 
      Equipment, leasehold improvements and capitalized software, net consist of the following (in thousands): 

		December 31,	
			
		2001		2000	
					
Machinery, equipment and furniture 	 	$	11,044	 	 	$	8,535	 	
Computers and capitalized software 	 	 	9,890	 	 	 	7,633	 	
Leasehold improvements 	 	 	13,006	 	 	 	5,191	 	
 	 	 		 	 	 		 	
 	 	 	33,940	 	 	 	21,359	 	
Less: accumulated depreciation 	 	 	(14,952	)	 	 	(8,894	)	
 	 	 		 	 	 		 	
Equipment, leasehold improvements and capitalized software, net 	 	$	18,988	 	 	$	12,465	 	
 	 	 		 	 	 		 	
      Depreciation expense totaled $6.1 million, $3.1 million and $2.8 million for the years ended December 31, 2001, 2000 and 1999, respectively. Equipment and leasehold improvements at December 31, 2001 and 2000 include items under capitalized leases in the amount of $0.6 million and $0.7 million, respectively, and related accumulated depreciation of $0.5 million and $0.5 million at December 31, 2001 and 2000, respectively. These leases are secured by the equipment leased thereunder. During 2001, there were write-offs 
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 
of certain capitalized software aggregating $1.1 million. These write-offs are included in research and development expenses in the accompanying Statement of Operations. 
3.     Accumulated Other Comprehensive Losses 
      Accumulated other comprehensive income or loss consists entirely of unrealized gains and losses on securities. The change in accumulated other comprehensive loss was $0, $32,000 and ($18,000) in 2001, 2000 and 1999, respectively. This change consisted entirely of unrealized losses on securities. 
4.     Patents, Licenses and Other Assets 

	Patents and Licenses	
      Patent costs are incurred in connection with obtaining certain patents and filing of related patent applications. Patent and license amortization expense was $99,008, $27,633 and $27,633 for the years ended December 31, 2001, 2000 and 1999, respectively. Patent amortization expense is recorded on a straight-line basis over the patent’s estimated useful life which approximates 17 years. 
     Patent License Agreement 
      In 1994, the Company entered into a patent license agreement with an affiliate of the University of Chicago for an exclusive license to use certain proprietary technology developed by the Company’s former Chief Scientific Officer and to develop, use, and sell licensed products or processes. The Company issued 15,244 shares of Series A preferred stock (which converted to common stock in connection with the Company’s initial public offering in 1997). The Company began paying minimum royalties of $25,000 per annum beginning in 1997 and increasing to $100,000 per annum in 1999, and will continue to pay minimum royalties at the rate of $100,000 per annum over the term of the agreement, which terminates upon the later to occur of (a) fifteen years after the date of the agreement or (b) the expiration of the last-to-expire patents of the licensed patent rights. 
5.     Capital Lease and Loan Obligations 
      The Company has financed equipment purchases through capital lease and loan agreements. The capital lease and loan obligations are to be repaid over terms of 48 to 60 months at interest rates ranging from 8.10% to 14.98% and are secured by the related equipment. 
      Future minimum payments under the capital lease and loan agreements are as follows (in thousands): 
 	 	 	 	 	 	 	
Years Ending December 31:	 	 	 	 	
 	2002 	 	$	2,941	 	
 	2003 	 	 	1,435	 	
 	2004 	 	 	875	 	
 	2005 	 	 	201	 	
 	2006 	 	 	4	 	
 	 	 		 	
 	 	Total loan payments 	 	 	5,456	 	
 	Less: Amount representing interest 	 	 	(722	)	
 	 	 		 	
Present value of future loan payments 	 	 	4,734	 	
 	Less: Current portion 	 	 	(2,506	)	
 	 	 		 	
Noncurrent portion 	 	$	2,228	 	
 	 	 		 	
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 
6.     Commitments and Contingencies 

	Operating Leases	
      The Company leases three facilities under operating lease agreements, two that expire in June 2005 and one that expires in July 2011. In April 2001 the Company leased an additional approximately 138,698 square feet of space at 985 Almanor Avenue in Sunnyvale, California, adjacent to our current operating facilities. The lease on this new space requires base lease payments on average of approximately $451,000 per month and extends through May 2011. Rental expense was approximately $8.1 million in 2001, $2.1 million in 2000, and $1.4 million in 1999. The leases provide for scheduled rent increases annually over the terms of the leases. The rent is being recognized as expense on a straight-line basis. 
      Minimum future rental commitments under non-cancelable operating leases at December 31, 2001 are as follows (in thousands): 
 	 	 	 	 	 	
		Minimum Rental	
		Commitments	
			
Year Ended December 31,	 	 	 	 	
 	2002 	 	$	9,569	 	
 	2003 	 	 	9,975	 	
 	2004 	 	 	10,394	 	
 	2005 	 	 	9,986	 	
 	2006 	 	 	9,583	 	
 	2007 and thereafter 	 	 	43,780	 	
 	 	 		 	
 	 	$	93,287	 	
 	 	 		 	
     Letters of Credit 
      In accordance with the terms of the 675 Almanor facility lease agreement signed in the fourth quarter of 1997, the Company was required to obtain an irrevocable standby letter of credit in the amount of $2.0 million as partial security for the Company’s lease obligations. In connection with obtaining the letter of credit, the Company was required to place $2.1 million restricted cash on deposit with the Company’s primary bank as security for the letter of credit. The letter of credit and the cash collateralizing it was reduced by $0.5 million commencing in July 2001 and will be further reduced by $0.5 million each year thereafter to a certain minimum amount provided that no default under the lease occurs. The cash on deposit at any time in conjunction with this letter of credit is restricted and cannot be withdrawn. The Company controls the investment of the cash and receives interest earned thereon. The Company was also required to provide a letter of credit in the amount of $4.0 million as additional security for the lease of 985 Almanor Avenue, which requirement terminates after 5 years if the Company has not been in monetary default under the lease. Under the terms of the Humboldt Court lease, the Company was required to provide a $2.0 million letter of credit. This letter of credit was provided in March 2002 and must be increased by $1.0 million annually in each of August 2002 and August 2003, after which it can decrease by $2.0 million in 2007. 
7.     Collaborative Agreements 

	Aurora	
      In July 2001, the Company entered into a two-year collaboration and license agreement with Aurora Biosciences Corporation, under which Aurora will screen over 200 secreted proteins from the Company’s proprietary collection, using Aurora’s proprietary CellSensor™ Panel, and also granted the Company a non-exclusive license to certain fluorescent protein technologies. Aurora will use its technology on behalf of the 
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Company to identify proteins of interest as potential therapeutics and will receive upfront payments, licensing fees and technology access fees. Aurora may receive performance milestones, as well as development milestones and royalties on the Company’s products that result from the collaboration. In addition, as part of the agreement, the Company will provide Aurora access to selected novel targets from the Company’s database of proprietary full-length cDNAs. The Company will receive a database access fee and licensing fees and may receive development milestones and royalties on Aurora’s small molecule products that result from the collaboration. 
     Deltagen 
      In October 2001, the Company entered into a collaboration with Deltagen, Inc. to undertake research and development activities on approximately 200 novel secreted proteins. The Company will provide gene sequences encoding for the secreted proteins, and Deltagen will utilize its in vivo mammalian gene knockout technology to identify and validate potential commercially relevant biopharmaceutical drug targets. Deltagen and the Company will each have certain joint development and commercialization rights around potential biopharmaceutical drug targets discovered through the collaboration. Deltagen and the Company will share the collaboration’s costs; Hyseq will provide Deltagen with approximately $10.0 million in research and development payments over two years. 
     Kirin 
      In August 2001, the Company entered into a collaboration with Kirin Brewery Co. Ltd., in which Kirin will fund three years of collaborative research work at Hyseq and both companies will conduct research directed toward discovering proteins and antibodies for a variety of diseases, including hematopoietic and inflammatory diseases. Discoveries during the collaboration will be jointly owned by Kirin and Hyseq, and will be jointly developed and marketed with costs, efforts, and revenues shared by both companies. The Company will have marketing rights in North America on all products discovered and developed under the collaboration. Kirin will have marketing rights in Asia, New Zealand, and Australia. Marketing rights will be shared by both companies in the rest of the world. 
      In October 1998, the Company entered into a collaboration with Kirin Brewery Co. Ltd., in which the Company used its proprietary gene discovery technologies to target novel genes relating to a specific growth factor activity from certain cell lines provided by Kirin. The Company retains exclusive rights to develop and market pharmaceutical products resulting from the collaboration in North America, subject to milestone and royalty payments to Kirin. Kirin retains equivalent rights and obligations in Asia and Oceania. The Company and Kirin share such rights equally in Europe and the rest of the world. Under the terms of the agreement, Kirin paid the Company $3.0 million for the initial phase of the collaboration. Total revenue recognized in 2000, 1999 and 1998 under the agreement was $0.3 million, $1.2 million and $1.5 million, respectively. The agreement was extended once and expired March 31, 2001. 
     BASF 
      In December 1999, the Company entered into a collaboration with American Cyanamid Company in which the Company uses its signature-by-hybridization technology to target agricultural products. During 2000, BASF Aktiengesellschaft acquired the crop protection business of American Cyanamid Company and subsequently assigned our collaboration with American Cyanamid to BASF Plant Sciences GmbH (or BASF). The collaboration provides for funding of $60 million over its initial term of three and one half years. The collaboration can be extended by mutual agreement for up to four additional one-year terms. Subject to compliance with the terms of the contract, the Company expects to recognize revenue from this collaboration over the term of the agreement as services are performed. Total revenue recognized in 2001 and 2000 under the agreement was $22.4 million and $11.7 million respectively. BASF has the exclusive right to commercial- 
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ize any agricultural products resulting from the collaboration. The Company will receive royalties on any such products. 
     Chiron 
      In May 1997, the Company entered into a collaboration with Chiron Corporation. Pursuant to the terms of the collaboration agreement, the Company and Chiron are collaborating to develop solid tumor therapeutics, diagnostic molecules and vaccines. The collaboration had an initial term of three years and has been extended by Chiron for an additional two-year period. Chiron may extend the collaboration for one more two-year period. Chiron has the exclusive right to commercialize solid tumor therapeutics, diagnostic molecules and vaccines resulting from the collaboration. The Company will receive royalties on any such products. Concurrent with execution of the collaboration agreement in 1997, Chiron made an equity investment of $5.0 million in return for shares of the Company’s preferred stock, which subsequently converted into common stock upon the Company’s initial public offering in 1997. Chiron also purchased shares of common stock directly from the Company in a private placement concurrent with the Company’s initial public offering in 1997 for an aggregate purchase price of $2.5 million. Total revenue recognized in 2001, 2000, and 1999 under the agreement with Chiron was $1.2 million, $3.3 million, and $4.9 million, respectively, which the Company received as research funding payments and recognized as revenue as earned. The Company has no future performance obligations related to the revenue recognized in 2001, 2000, and 1999 and no portions of such revenues are refundable. 
     UCSF 
      In February 1998, the Company entered into a collaborative agreement with the University of California San Francisco (or UCSF) to conduct research on genes that may have important roles in the development of cardiovascular and related diseases. Under the terms of the five-year agreement, the Company makes quarterly payments of approximately $0.1 million to UCSF in connection with the agreement to reimburse UCSF for direct and indirect expenses incurred in clinical sample collection and for research conducted. 
     Applied Biosystems 
      In May 1997, the Company entered into an agreement with the Applied Biosystems Stock Group of Applera Corporation to combine certain of the Company’s chip technology and Applied Biosystems’ life science system capabilities to commercialize the HyChip system. Pursuant to the terms of the agreement, the Company committed $5.0 million to further development of the Company’s “chip” component of the HyChip system. The Company spent approximately $2.0 million for the development of the chip component of the HyChip system from June 1997 through December 1997. Of this amount, $0.5 million was reimbursed to the Company under its NIST grant. As of December 31, 1998, the Company had satisfied the $5.0 million obligation under its agreement with Applied Biosystems. In October 2001, Applied Biosystems and the Company amended the collaboration to facilitate the settlement with Affymetrix. Significant components of this amendment include the conversion of the prior exclusive marketing arrangement with Applied Biosystems into a non-exclusive arrangement and the conclusion of all further collaboration obligations. In June 1997 Applied Biosystems made an equity investment of $5.0 million in return for shares of the Company’s preferred stock, which subsequently converted into common stock upon the Company’s initial public offering in 1997. Applied Biosystems also purchased shares of common stock directly from the Company in a private placement concurrent with the initial public offering in 1997 for an aggregate purchase price of $5.0 million. The Company recognized approximately $0.3 million in revenue in each of 2001, 2000, and 1999 from Applied Biosystems from research funding reimbursement under the collaboration and from an expansion of the existing relationship as services were performed. 
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     Affymetrix 
      In October 2001, the Company and Affymetrix Inc. resolved all outstanding litigation and entered into a collaboration to accelerate development and commercialization of a high speed universal DNA sequencing chip. This collaboration with Affymetrix is through a newly created venture, N-Mer, Inc., that is a wholly owned subsidiary of Callida, which in turn is a newly formed majority-owned subsidiary of the Company. N-Mer will have access to both SBH technology from the Company, through Callida, and to Affymetrix’ GeneChip technology, a platform for array-based experiments. Affymetrix will be the exclusive array and system supplier and is initially authorized to be the exclusive agent for the distribution of any potential N-Mer products. 
      Hyseq contributed cash, certain assets consisting primarily of equipment, capitalized software, and SBH intellectual property to Callida upon its formation in exchange for a 90% interest in Callida, in the form of Series A convertible preferred stock (See Note 8). In exchange for a contribution of certain intellectual property (a non-exclusive license to 12 U.S. patents or patent applications and counterpart foreign applications in a limited field of use) to Callida, Affymetrix received a 10% equity interest in Callida, in the form of Series A-1 convertible preferred stock (See Note 8). The Company accounts for the Affymetrix 10% ownership share as minority interest in Callida, recognizing a portion of Callida’s losses attributable to Affymetrix as a gain on the statement of operation, up to the point where Affymetrix’ initial minority interest investment is depleted. Beyond that point, the Company will absorb 100% of the net losses until Callida generates net income. 
      Affymetrix gave a total of $8.0 million in cash to Hyseq at the close of the settlement. The $8.0 million payment is comprised of two pieces. First, Affymetrix made a license payment of $4.0 million dollars in return for a non-exclusive license, without the right to grant sublicenses, under 11 U.S. patents and 30 U.S. patent applications and counterpart foreign patents and applications to make, use, sell, and import products in the non-universal array field. Universal arrays are DNA arrays designed without reference to specific gene sequences that can be used to sequence any gene. This license payment will be recognized as revenue as Callida utilizes its cash in conducting R&D efforts. 
      Second, Affymetrix made a loan to Hyseq of $4.0 million (interest rate of 7.5%, 5 year term) for Hyseq’s cash investment in Callida. In lieu of cash repayment of this loan, Hyseq has the right, at any time, to exchange the note in whole or in part into such number of shares of Hyseq common stock (based on a price per share equal to 90% of the ten day trailing average price) equal to the aggregate amount of principal and interest to be exchanged. 
      Callida capitalized the intellectual property contributed by Affymetrix at its fair value of $1.7 million, based on its estimate of future royalty payments on potential Callida and N-Mer products, and based upon its determination that the intellectual property contributed has a future alternative use. The intellectual property will be amortized on a straight-line basis over its estimated useful life of four years. 
      Both Hyseq and Affymetrix committed to invest additional amounts in N-Mer, contingent on Callida achieving certain milestones. Affymetrix received an option to purchase a majority interest of the outstanding common stock of N-Mer at a predetermined sum, exercisable at any time over the next five years. The Company believes that Affymetrix’s purchase option has no material fair value, until such point that research reaches a technical milestone and product feasibility is achieved, and has no accounting implications as of the date of inception of Callida or as of December 31, 2001. The Company will periodically evaluate the value of N-Mer to determine whether Affymetrix’s purchase option has value. If so, such value will be recorded through earnings and on Hyseq’s balance sheet. 
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8.     Stockholders’ Equity 

	Preferred Stock	
      The Company is authorized to issue 8,000,000 shares of preferred stock. The Company’s Board of Directors may set the rights and privileges of any preferred stock issued. 
      As of December 31, 2001 and 2000, there were no issued and outstanding shares of preferred stock. On June 5, 1998, Hyseq’s Board of Directors adopted a rights plan and declared a dividend with respect to each share of common stock then outstanding. This dividend took the form of a right that entitles the holders to purchase one one-thousandth of a share of our Series B junior participating preferred stock at a purchase price of $175, subject to adjustment from time to time. These rights have also been issued in connection with each share of common stock issued after June 5, 1998. The rights are exercisable only if a person or entity or affiliated group of persons or entities acquires, or has announced its intention to acquire, 15% (27.5% in the case of certain approved stockholders) or more of the Company’s outstanding common stock. The adoption of the rights plan makes it more difficult for a third party to acquire control of the Company without the approval of the Board of Directors. 
      In October 2001, the Company settled all outstanding litigation with Affymetrix, and created a new subsidiary, Callida Genomics, Inc. The authorized capital stock of Callida consists of 10,000,000 shares, of which 6,000,000 shares are common stock, par value $0.001 per share, and 4,000,000 shares are preferred stock, par value $0.001 per share. The preferred stock is divided into a Series A preferred stock, which consists of 3,600,000 shares, and Series A-1 preferred stock, which consists of 400,000 shares. Each of the Series A preferred stock and the Series A-1 preferred stock have aggregate liquidation preferences equal to $4.0 million, with no participation rights to future dividends and no redemption rights. The Series A preferred stock (held by Hyseq) has voting rights; the Series A-1 preferred stock (held by Affymetrix) has no voting rights. Callida classifies these preferred stock as permanent equity on its consolidated balance sheet. 
     Common Stock 
      In March 2001, we completed the draw down of the balance of the $20.0 million available under the first line of credit from our Chairman and paid off the outstanding principal balance in shares of our common stock as provided in the agreement. As a consequence, we issued 2,237,637 shares of common stock to our Chairman in satisfaction of $20.0 million in outstanding principal under the line of credit. 
      In August 2001, the Company announced the completion of a private stock placement of 3,040,734 newly issued shares of common stock at $7.00 per share, together with warrants to purchase 1,520,369 shares of common stock. The warrants are exercisable at any time through and including August 28, 2006 at $10.50 per share, a 50 percent premium to the per unit purchase price on the closing date, which may be adjusted to $7.95 per share based on certain future issuances. After August 28, 2003, the warrants may only be exercised on a cashless exercise basis. 
     Deferred Compensation 
      The Company recorded deferred compensation of $695,000 in 1997 representing the difference between the issuance and exercise prices related to stock awards and options and the fair value for financial reporting purposes of the Company’s common stock. The deferred compensation is being amortized to expense over the vesting period of the options and over the two-year repurchase period for the stock awards. The amortization of deferred compensation was $34,000, $29,000, and $89,000 in 2001, 2000, and 1999, respectively. At December 31, 2001, the deferred compensation balance was approximately $53,000. 
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     Warrants 
      As of December 31, 2001, warrants to purchase 1,657,889 shares of common stock were outstanding at exercise prices ranging from $4.17 to $10.50 ($9.97 weighted average exercise price) per share. These warrants are held by certain investors and executive officers and expire at various times between July 2002 and August 2006. 
     Stock Option Plans 
      In 1995, the Company’s stockholders adopted the 1995 Employee Stock Option Plan, or employee plan. The Company initially reserved a total of 1,152,000 common shares for issuance under the employee plan. At the 1998 annual meeting, the Company’s stockholders approved a proposal to increase the number of shares authorized for issuance under the Plan to 2,152,000. Options granted under the employee plan may be either incentive stock options or nonstatutory stock options. Incentive stock options may be granted to employees with exercise prices of not less than fair market value and nonstatutory options may be granted to employees at exercise prices of not less than par value of the common stock on the date of grant as determined by the board of directors. Options vest as determined by the board of directors (generally in four equal annual installments commencing one year after the date of grant), and expire 10 years from the date of grant. At December 31, 2001, 1,922,220 options were outstanding under the employee plan. 
      The Company granted options to purchase common stock to several key employees, directors, scientific advisory board members and scientists prior to adoption of the employee plan. Each option gives the holder the right to purchase common stock at prices between $0.78 and $1.82 per share. In 1998, the Company granted options outside of any of the Company’s stock option plans to purchase a total of 9,500 shares of common stock to three non-employee directors and a scientific advisory board member at prices between $4.75 and $10.06 per share. The options vest over periods up to four years. In February 2000, an officer and director of the Company was granted an option to purchase 1,000,000 shares of common stock at $31.69 per share, the closing price on the day prior to the grant, as an inducement to become an employee of the Company. This option becomes exercisable one-third upon the date of grant, one-third on the one-year anniversary and one third on the two-year anniversary of the date of grant. In 2001, the Company granted options outside of any of the Company’s stock option plans to purchase a total of 1,268,160 shares to five employee officers at prices between $9.96 and $12.56 per share as inducements to become employees of the company. In August 2001, a director of the Company was granted an option, contingent upon shareholder approval, to purchase 1,000,000 shares of common stock at $8.63 per share, the closing price on the day prior to the grant. As of December 31, 2001, 3,537,966 options issued outside of any of the Company’s stock option plans were outstanding. 
      In 1997, the Company’s stockholders adopted the Non-Employee Director Stock Option Plan, or directors plan, providing for periodic stock option grants to non-employee directors of the Company. Under the directors plan, each new, non-employee director receives a one-time grant of options to purchase 23,040 shares of common stock, of which options to purchase 11,520 shares vest immediately, with the balance vesting in two equal allotments on the first and second anniversaries of joining the Board. All non-employee directors automatically receive options to purchase up to 5,760 shares each year (such that the amount received under the directors plan when added to all prior options granted to a director which vest in that year total 5,760) on the date of the annual meeting of the stockholders commencing in 1997. Options under the directors plan are granted at the fair market value of the Company’s common stock on the date of the grant. In 2000, the Company’s stockholders approved an amendment to the directors plan that changed the method for determining the number of shares granted under the plan, and lengthened the vesting date for the new director’s initial and first annual grants of options. Under the amendment, the number of shares that are granted will be equal to the lesser of the number determined by dividing $200,000 by the fair market value of our common stock on the date of grant, or 10,000 shares. The amendment also revised the vesting date for 
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initial options that are granted when a new director joins our Board such that 50% of a new director’s option will vest one year after the grant date and the other 50% will vest two years after the grant date. A total of 438,240 shares of common stock have been reserved for issuance under the directors plan, of which options to purchase 147,155 shares were outstanding at December 31, 2001. 
      In 1999, the Company adopted a Scientific Advisory Board/Consultants Stock Option Plan that provides for periodic grants of non-qualified stock options to members of the Company’s scientific advisory board and allows the Board of Directors to approve grants of stock options to consultants. A total of 30,000 shares of common stock have been reserved for issuance under the Scientific Advisory Board/ Consultants Stock Option Plan, of which options to purchase 17,000 shares were outstanding at December 31, 2001. 
      During 2001, the Company granted 12,000 stock options under the Scientific Advisory Board/Consultants Stock Option Plan all of which become exercisable in April 2002. In connection with these grants, the Company recorded deferred compensation of $79,265 representing the fair value of the options granted in accordance with SFAS 123. This deferred compensation is periodically re-measured until the underlying options vest in accordance with EITF 96-18. The fair value of these options was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions: 1 year for the expected life of the option, 5.07% risk-free interest rate, and .8518 volatility rate. During 2001, the Company recorded $26,422 in amortization of deferred compensation related to grants to non-employees. 
      The directors plan, the employee plan, and the options granted to an officer and director to purchase 2,000,000 shares (as described above) provide for the acceleration of vesting of options upon certain specified events. 
      The Company values employee stock options using the intrinsic method of APB 25, rather than the fair value method of SFAS 123. Nevertheless, the Company is required for purposes of comparison to present net loss and loss per share on a pro forma basis as if the fair value method had been used. The fair value for employee stock options was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions: 

		Year Ended December 31,	
			
		2001		2000		1999	
							
Volatility 	 	 	1.17	 	 	 	1.38	 	 	 	1.64	 	
Risk-free interest rate 	 	 	5.13	%	 	 	6.14	%	 	 	6.25	%	
Dividend yield 	 	 	—	 	 	 	—	 	 	 	—	 	
Expected life of option 	 	 	2.3 years	 	 	 	2.6 years	 	 	 	2.5 years	 	
      The Black-Scholes option pricing model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. Because the Company’s employee stock options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the existing models do not necessarily provide a reliable single measure of the fair value of its employee stock options. 
      For purposes of pro forma disclosures, the estimated fair value of the options is amortized to expense over the options’ vesting period. Because SFAS 123 is applicable only to options granted subsequent to December 15, 1994, the pro forma adjustment to net income was not fully reflected until fiscal year 1999. 
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      The Company’s pro forma information follows (in thousands, except for per share information): 

		Year Ended December 31,	
			
		2001		2000		1999	
							
Net loss as reported 	 	$	(36,472	)	 	$	(22,253	)	 	$	(18,547	)	
Pro forma net loss 	 	 	(52,894	)	 	 	(42,717	)	 	 	(19,484	)	
Basic and diluted net loss per share as reported 	 	 	(2.26	)	 	 	(1.65	)	 	 	(1.43	)	
Pro forma basic and diluted net loss per share 	 	 	(3.27	)	 	 	(3.18	)	 	 	(1.50	)	
      A summary of the Company’s stock option activity, and related information follows: 

		Year Ended December 31,	

		2001		2000		1999	
							
				Weighted-				Weighted-				Weighted-	
				Average				Average				Average	
		Number of		Exercise		Number of		Exercise		Number of		Exercise	
		Shares		Price		Shares		Price		Shares		Price	
													
Options outstanding at beginning of period 	 	 	2,566,379	 	 	$	20.10	 	 	 	1,779,324	 	 	$	3.80	 	 	 	1,583,558	 	 	$	4.03	 	
 	Options granted 	 	 	3,387,750	 	 	$	10.25	 	 	 	1,500,275	 	 	$	31.80	 	 	 	776,720	 	 	$	3.77	 	
 	Options exercised 	 	 	(71,860	)	 	$	3.87	 	 	 	(562,722	)	 	$	3.29	 	 	 	(144,466	)	 	$	1.96	 	
 	Options canceled 	 	 	(257,928	)	 	$	21.31	 	 	 	(150,498	)	 	$	7.19	 	 	 	(436,488	)	 	$	5.18	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
Options outstanding at end of period 	 	 	5,624,341	 	 	$	14.32	 	 	 	2,566,379	 	 	$	20.10	 	 	 	1,779,324	 	 	$	3.80	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
      The following table summarizes information about stock options outstanding and exercisable at December 31, 2001: 

		Options Outstanding			
				Options Exercisable	
				Weighted-					
				Average		Weighted-				Weighted-	
Range of		Number of		Remaining		Average		Number of		Average	
Exercise Price		Shares		Contractual Life		Exercise Price		Shares		Exercise Price	
											
$  1.56 – $  4.17 	 	 	600,256	 	 	 	5.26	 	 	$	2.92	 	 	 	449,814	 	 	$	2.80	 	
   4.44 –    7.82 	 	 	312,108	 	 	 	7.58	 	 	 	5.54	 	 	 	174,058	 	 	 	5.33	 	
   8.02 –    8.64 	 	 	1,114,476	 	 	 	9.32	 	 	 	8.60	 	 	 	86,676	 	 	 	8.33	 	
   8.67 –   10.40 	 	 	456,266	 	 	 	9.44	 	 	 	10.14	 	 	 	10,666	 	 	 	9.45	 	
  10.44 –   10.44 	 	 	985,320	 	 	 	9.58	 	 	 	10.44	 	 	 	0	 	 	 	0.00	 	
  10.49 –   12.50 	 	 	747,460	 	 	 	9.14	 	 	 	12.23	 	 	 	209,000	 	 	 	12.42	 	
  12.56 –   29.81 	 	 	345,380	 	 	 	8.77	 	 	 	25.44	 	 	 	122,039	 	 	 	26.19	 	
  31.69 –   31.69 	 	 	1,000,000	 	 	 	8.08	 	 	 	31.69	 	 	 	666,666	 	 	 	31.69	 	
  32.03 –   95.19 	 	 	60,075	 	 	 	8.52	 	 	 	43.67	 	 	 	28,875	 	 	 	46.55	 	
 101.44 –  101.44 	 	 	3,000	 	 	 	8.16	 	 	 	101.44	 	 	 	750	 	 	 	101.44	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
 	 	 	5,624,341	 	 	 	8.56	 	 	$	14.32	 	 	 	1,748,544	 	 	$	17.93	 	
 	 	 		 	 	 		 	 	 		 	 	 		 	 	 		 	
      The weighted-average grant-date fair value of options granted during the years ended December 31, 2001, 2000 and 1999 was $8.23, $22.90 and $3.52, respectively. 
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	Employee Stock Purchase Plan	
      In 1998, the Company’s stockholders approved an Employee Stock Purchase Plan, covering an aggregate of 50,000 shares of the Company’s common stock. Each quarter, an eligible employee may elect to purchase shares of the Company’s stock through payroll deductions at a price equal to the lower of 85% of the fair value of the stock as of the first business day of the quarter or the last business day. In 1999, the Company’s stockholders approved an amendment to the Company’s Employee Stock Purchase Plan that increased the maximum number of shares of common stock available for purchase under the Plan from 50,000 to 250,000. In the year ended December 31, 2001, 67,674 shares of the Company’s stock were sold under the Employee Stock Purchase Plan at a weighted-average price of $8.20 per share. 
9.     Income Taxes 
      The reconciliation between the amount computed by applying the U.S. federal statutory tax rate of 34% to income taxes and the actual provision for income taxes as of December 31, 2001 follows (in thousands): 
 	 	 	 	 	
Income tax at statutory rate (34%) 	 	 	(12,500	)	
Net losses and temporary differences for which no current benefit is recognized 	 	 	12,580	 	
Permanent differences 	 	 	(80	)	
 	 	 		 	
Income tax expense reported 	 	 	—	 	
 	 	 		 	
      As of December 31, 2001, the Company had federal and state net operating loss carryforwards of approximately $107.7 million and $23.0 million, respectively. The Company also had federal and California research and development tax credit carryforwards of approximately $2.5 million and $2.3 million, respectively. The federal net operating loss and credit carryforwards will expire at various dates beginning in the year 2008 through 2021, if not utilized. The State of California net operating losses will expire at various dates beginning in 2001 through 2011, if not utilized. The California Research Credits carryforward indefinitely. 
      Utilization of the Company’s net operating loss carryforwards and credits may be subject to an annual limitation due to the “change in ownership” provisions of the Internal Revenue Code of 1986 and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization. 
      Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets for financial reporting and the amount used for income tax purposes. Significant components of the Company’s deferred tax assets for federal and state income taxes are as follows (in thousands): 

		Year Ended December 31,	
			
		2001		2000	
					
Deferred Tax Assets: 	 	 	 	 	 	 	 	 	
 	Net operating loss carryforwards 	 	$	37,970	 	 	$	28,971	 	
 	Research and other credits 	 	 	4,422	 	 	 	6,564	 	
 	Capitalized research expenses 	 	 	2,446	 	 	 	856	 	
 	Accrued expenses and reserves 	 	 	3,921	 	 	 	1,362	 	
 	Deferred revenue 	 	 	1,475	 	 	 	—	 	
 	 	 		 	 	 		 	
 	 	Total deferred tax assets 	 	 	50,234	 	 	 	37,753	 	
 	Valuation allowance 	 	 	(50,234	)	 	 	(37,753	)	
 	 	 		 	 	 		 	
 	Net deferred tax assets 	 	$	—	 	 	$	—	 	
 	 	 		 	 	 		 	
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 
      Deferred tax assets are reduced by a valuation allowance as management believes that it is more likely than not that the deferred tax assets will not be realized. The net valuation allowance increased by $12.5 million, $15.7 million and $8.3 million for the fiscal years ended December 31, 2001, 2000 and 1999, respectively. 
      Approximately $12.2 million of the federal net operating losses and $6.6 million of the state net operating losses relate to deductions from stock based compensation. No income statement benefit will result from the realization of these losses. 
10.     Transactions with Related Parties 
      As of December 31, 2001, 2000 and 1999, the Company had outstanding accounts payable balances of approximately $3,000, $45,000, and $86,000 respectively, for professional services rendered by a law firm of which the spouse of the Company’s former President and Chief Executive Officer was a member. The Company incurred legal fees and costs to this law firm of approximately $57,000, $400,000, and $441,000 for the years ended December 31, 2001, 2000 and 1999, respectively. 
      In August 2001, the Company received a commitment from its Chairman to provide a second line of credit of up to $20.0 million in aggregate principal amount, secured by a promissory note and available for draw down through August 5, 2003. The Chairman has also agreed to provide financing to fund operating activities as needed through 2001. Amounts outstanding under the line of credit bear interest at prime plus 1% and are payable in 48 equal monthly installments beginning upon the expiration date of August 5, 2003. The promissory note issued pursuant to such line of credit may be converted into shares of its common stock at any time upon the agreement of us and Dr. Rathmann at a price based upon the average price of our common stock over the 20-day period prior to such conversion or, if in connection with an equity financing, at the offering price. In February 2002, we drew down $4.0 million of the $20.0 million line of credit. 
      Our Chairman guaranteed our 985 Almanor lease (up to a certain maximum amount) and provided the collateral for the Company’s $4.0 million letter of credit under this lease. Our Chairman also guaranteed our Humboldt Court lease (to a certain maximum amount) and provided the collateral for the Company’s $2.0 million letter of credit under this lease. 
      The Chairman receives no cash compensation as an employee and instead receives options to purchase 3,000 shares per month. In August 2001, the Board also granted the Chairman an option to purchase an additional 1,000,000 shares. However, to date, at the request of the Chairman, the Company has not granted the Chairman any equity incentives in recognition of the lines of credits that the Chairman made available to the Company, the Chairman’s guarantee of the Company’s real estate leases, the Chairman’s provision of collateral for two of the Company’s letters of credit under facilities leases, or the occasional use of the Chairman’s private jet for Company business. The Company believes that the Board is likely to take action in the future to provide appropriate incentives to the Chairman in order to ensure his continued active involvement in the Company. 

11.	Selected Quarterly Financial Data (Unaudited)	
      Summarized selected quarterly financial data is as follows (in thousands): 

		Quarter Ended	
			
		December 31,		September 30,		June 30,		March 31,	
		2001		2001		2001		2001	
									
Contract revenues 	 	$	7,069	 	 	$	5,872	 	 	$	5,981	 	 	$	5,668	 	
 	Loss from operations 	 	 	(11,553	)	 	 	(9,905	)	 	 	(8,349	)	 	 	(6,386	)	
 	 	Net loss 	 	 	(11,357	)	 	 	(10,008	)	 	 	(8,427	)	 	 	(6,679	)	
Basic and diluted net loss per share* 	 	 	(0.61	)	 	 	(0.59	)	 	 	(0.55	)	 	 	(0.49	)	
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HYSEQ PHARMACEUTICALS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

		Quarter Ended	
			
		December 31,		September 30,		June 30,		March 31,	
		2000		2000		2000		2000	
									
Contract revenues 	 	$	4,289	 	 	$	5,936	 	 	$	3,574	 	 	$	1,805	 	
 	Loss from operations 	 	 	(6,627	)	 	 	(4,199	)	 	 	(5,331	)	 	 	(6,572	)	
 	 	Net loss 	 	 	(6,695	)	 	 	(4,116	)	 	 	(5,112	)	 	 	(6,330	)	
Basic and diluted net loss per share 	 	 	(0.49	)	 	 	(0.30	)	 	 	(0.38	)	 	 	(0.48	)	

* 	The sum of earnings per share for the four quarters of 2001 is different from the full year amount as a result of computing the quarterly and full year amounts on the weighted average number of common shares outstanding in the respective periods. 	
      Historically, the Company’s revenues have varied considerably from period to period due to the nature of the Company’s collaborative arrangements. As a consequence, the Company’s results in any one quarter are not necessarily indicative of results to be expected for a full year. 
      The third quarter of 2001 included a reclass of restructuring cost of $ 825,000 from other income expenses to operations. 
      The fourth quarter of 2001 included (i) an adjustment to increase contract revenues of approximately $402,000 and (ii) the write-off of certain capitalized software costs of approximately $1,087,000. 
12.     Subsequent Events (Unaudited) 
      In January 2002, the Company entered into collaboration with Amgen, Inc. to develop and commercialize alfimeprase, a novel acting thrombolytic, for the treatment of PAO and other cardiovascular indications. Under the terms of the agreement, Hyseq will lead development and be responsible for all clinical development activities, while Amgen will be responsible for manufacturing activities. Alfimeprase, a product candidate that was identified through Amgen’s research program, is a derivative of the fibrolase enzyme and is being developed for the treatment of PAO. PAO of the lower extremity is a significant cause of morbidity and amputation in the United States with over 100,000 cases reported annually. Pre-clinical studies indicate that alfimeprase is a promising agent for dissolving clots (clot lysis), and may be particularly well suited for the PAO indication. An IND for alfimeprase has been filed, and Hyseq anticipates initiating clinical studies in the second quarter of 2002. 
      In January 2002, the Company, through its subsidiary Callida, entered into a collaborative agreement with Intel Corporation to develop technology for the detection, identification, and analysis of DNA or other biomolecules. The goal of this research collaboration is to explore new technologies for biomolecule detection and identification. Callida will focus on developing novel approaches to DNA sequencing, and Intel will focus on developing devices and protocols for detecting and reading the data. 
      In February 2002, the company drew down $4.0 million of the $20.0 million line of credit that it received from its Chairman in August 2001. 
      In February 2002, the Company entered into a research agreement with Genetastix, a privately held biotechnology company, to use Genetastix’s HuMYTech™ technology to generate fully human monoclonal antibodies against a proprietary antigen. 
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Item 9.     	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	
      Not applicable. 
PART III 

Item 10.     	Directors and Executive Officers of the Registrant	
      The response to this item is incorporated by reference to “General Information” and “Section 16(a) Beneficial Ownership Reporting Compliance” under Proposal No. 1 and “Certain Information with Respect to Executive Officers” in our Definitive Proxy Statement to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, relating to the Company’s Annual Meeting of Stockholders to be held on May 29, 2002. 
Item 11.     Executive Compensation 
      The response to this item is incorporated by reference to “Executive Compensation” in the Company’s Definitive Proxy Statement to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, relating to the Company’s Annual Meeting of Stockholders to be held on May 29, 2002. 

Item 12.     	Security Ownership of Certain Beneficial Owners and Management	
      The response to this item is incorporated by reference to “Security Ownership of Certain Beneficial Owners and Management” in the Company’s Definitive Proxy Statement to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, relating to the Company’s Annual Meeting of Stockholders to be held on May 29, 2002. 
Item 13.     Certain Relationships and Related Transactions 
      The response to this item is incorporated by reference to “Certain Relationships and Related Transactions” in the Company’s Definitive Proxy Statement to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, relating to the Company’s Annual Meeting of Stockholders to be held on May 29, 2002. 
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PART IV 
Item 14.     Exhibits, Financial Statement Schedules, and Reports on Form 8-K 
      (a)(1) The Financial Statements and report of independent auditors required by this Item are submitted in a separate section, beginning on page 39 of this Report. 
 	 	 	 	 	
		Page	
		No.	
			
Independent Auditors’ Report KPMG LLP 	 	 	44	 	
Report of Ernst & Young LLP, Independent Auditors’ 	 	 	45	 	
Consolidated Balance Sheets as of December 31, 2001 and 2000 	 	 	46	 	
Consolidated Statements of Operations for the years ended December 31, 2001, 2000 and 1999 	 	 	47	 	
Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2001, 2000 and 1999 	 	 	48	 	
Consolidated Statements of Cash Flows for the years ended December 31, 2001, 2000 and 1999 	 	 	49	 	
Notes to Consolidated Financial Statements 	 	 	50	 	
      (a)(2) The schedules have been omitted because they are not applicable or are not required or the information required to be set forth therein is included in the Financial Statements or notes thereto. 
      (a)(3) Exhibits 
		
 	      The following documents are filed as part of this annual report on Form 10-K. The Company will furnish a copy of any exhibit listed to requesting stockholders upon payment of the Company’s reasonable expenses in furnishing those materials. 	
 	 	 	 	 	
Exhibit			
Number		Description	
			
 	3.1	 	 	Amended and Restated Articles of Incorporation of the Company, as amended(1) 	
 	3.2	 	 	Amended and Restated By-Laws of the Company(9) 	
 	3.3	 	 	Amendment No. 3 to Amended and Restated Articles of Incorporation of Hyseq, Inc.(10) 	
 	4.1	 	 	Specimen Common Stock certificate(1) 	
 	4.2	 	 	Form of Registration Rights Agreement(1) 	
 	4.3	 	 	Form of Warrant Agreement(1) 	
 	4.4	 	 	Rights Agreement between Hyseq, Inc. and U.S. Stock Transfer dated June 5, 1998(2) 	
 	4.5	 	 	Form of Securities Purchase Agreement, dated as of August 28, 2001, by and among Hyseq, Inc. and the investors party thereto.(10) 	
 	4.6	 	 	Form of Registration Rights Agreement, dated as of August 28, 2001, by and among Hyseq, Inc. and the investors party thereto.(10) 	
 	4.7	 	 	Form of Warrant, dated as of August 28, 2001(10) 	
 	4.8	 	 	Hyseq Promissory Note, dated as of November 13, 2001, in the principal amount of $4,000,000 	
 	4.9	 	 	Registration Rights Agreement, dated as of November 13, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	4.10	 	 	Pledge and Security Agreement, dated as of November 13, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	10.1	 	 	Form of Indemnification Agreement between the Company and each of its directors and officers(1) 	
 	10.2	 	 	Stock Option Plan, as amended†(3) 	
 	10.3	 	 	Non-Employee Director Stock Option Plan, as amended†(4) 	
 	10.4	 	 	Patent License Agreement between Arch Development Corporation and Hyseq, Inc. dated June 7, 1994(1) 	
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Exhibit			
Number		Description	
			
 	10.5	 	 	Stock Purchase Agreement for Series B Convertible Preferred Stock dated May 28, 1997(1) 	
 	10.6	 	 	Collaboration and License Agreement between Hyseq Inc. and Chiron Corporation dated May 30, 1997(1) 	
 	10.7	 	 	Collaboration Agreement between Hyseq Inc. and The Perkin-Elmer Corporation dated May 30, 1997(1) 	
 	10.8	 	 	Employee Stock Purchase Plan†(5) 	
 	10.9	 	 	Non-Qualified Employee Stock Purchase Plan(8) 	
 	10.10	 	 	Scientific Advisory Board/ Consultants Stock Option Plan(8) 	
 	10.11	 	 	Collaboration and License Agreement between Hyseq, Inc. and American Cyanamid Company dated December 10, 1999(6) 	
 	10.12	 	 	Line of Credit Agreement between Hyseq, Inc. and Dr. George B. Rathmann dated November 10, 2000(7) 	
 	10.13	 	 	Employment and Confidential Information Agreement between Hyseq, Inc. and Ted W. Love dated January 11, 2001(9) 	
 	10.14	 	 	Industrial Multi-Tenant Lease by and between AMB Property, L.P. and Hyseq, Inc. dated June 23, 2000, as amended(9) 	
 	10.15	 	 	Lease between The Irvine Company and Hyseq, Inc. dated as of April 30, 2001(11) 	
 	10.16	 	 	Collaboration and License Agreement, dated as of June 29, 2001, by and between Hyseq, Inc. and Aurora Biosciences Corporation 	
 	10.17	 	 	Collaboration Agreement, dated as of August 21, 2001, by and between Hyseq, Inc. and Kirin Brewery Company, Ltd. 	
 	10.18	 	 	Secreted Protein Development and Collaboration Agreement, dated as of October 9, 2001, by and between Hyseq, Inc. and Deltagen, Inc. 	
 	10.19	 	 	Line of Credit Agreement, dated as of August 6, 2001, by and between Hyseq, Inc. and Dr. George B. Rathmann 	
 	10.20	 	 	Settlement Agreement, dated as of October 24, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	10.21	 	 	Interference Settlement Agreement, dated as of October 24, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	10.22	 	 	Product Development and Supply Agreement, dated as of October 24, 2001, by and between N-Mer, Inc. and Affymetrix, Inc. 	
 	10.23	 	 	Product Solicitation Agreement, dated as of October 24, 2001, by and between N-Mer, Inc. and Affymetrix, Inc. 	
 	10.24	 	 	Option Agreement, dated as of October 24, 2001, by and among Affymetrix, Inc, Hyseq, Inc., Callida Genomics, Inc., and N-Mer, Inc. 	
 	10.25	 	 	Stock Option Agreement, dated as of February 1, 2000 by and between Hyseq, Inc. and Dr. George B. Rathmann 	
 	10.26	 	 	Stock Option Agreement, dated as of August 21, 2001 by and between Hyseq, Inc. and Dr. George B. Rathmann 	
 	21.1	 	 	Subsidiaries of Hyseq, Inc. as of December 31, 2001: Callida Genomics, Inc., a Delaware corporation; N-Mer, Inc., a Delaware corporations; Hyseq Diagnostics, Inc., a Nevada corporation 	
 	23.1	 	 	Consent of KPMG LLP, Independent Auditors 	
 	23.2	 	 	Consent of Ernst & Young LLP, Independent Auditors 	

 	(1) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Registration Statement filed on Form S-1, as amended, File No. 333-29091. 	
 		
 	(2) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Form 8-K, filed on July 31, 1998, File No. 00-22873. 	
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 	(3) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Registration Statement on Form S-8, File No. 333-41663. 	
 		
 	(4) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Registration Statement on Form S-8, File No. 333-53089. 	
 		
 	(5) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Registration Statement on Form S-8, File No. 333-53087. 	
 		
 	(6) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s report on Form 8-K/ A, filed on March 17, 2000, File No. 00-22873. 	
 		
 	(7) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s report on Form 8-K, filed on December 14, 2000, File No. 000-22873. 	
 		
 	(8) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Annual Report on Form 10-K for the year ended December 31, 1999, File No. 000-22873. 	
 		
 	(9) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Annual Report on Form 10-K for the year ended December 31, 2000, File No. 000-22873. 	
		
(10) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s Registration Statement on Form S-3, as amended, filed on September 25, 2001, File No. 333-70134. 	
 		
(11) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from the Company’s report on Form 8-K, filed on May 21, 2001, File No. 000-22873 	
			
 	†	Denotes compensation plan in which an executive officer or director participates. 	
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SIGNATURES 
      Pursuant to the requirements of Section 13 or 15(d) the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Sunnyvale, State of California, on March 29, 2002. 
		
 	HYSEQ, INC. 	
 	d/b/a HYSEQ PHARMACEUTICALS, INC. 	
			
 	By: 	                                             /s/ PETER S. GARCIA 

 	Peter S. Garcia 	
 	Senior Vice President and Chief Financial Officer	
      Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of Hyseq, Inc. in the capacities indicated on March 29, 2002. 

Signature		Title	

/s/ TED W. LOVE

Ted W. Love 	 	President and Chief Executive Officer (Principal Executive Officer), Director 	
 	
/s/ PETER S. GARCIA

Peter S. Garcia 	 	Senior Vice President and Chief Financial Officer (Principal Financial and Accounting Officer) 	
 	
/s/ GEORGE B. RATHMANN

George B. Rathmann 	 	Chairman of the Board 	
 	
/s/ ROBERT D. WEIST

Robert D. Weist 	 	Vice Chairman of the Board of Directors 	
 	
/s/ RAYMOND F. BADDOUR

Raymond F. Baddour 	 	Director 	
 	
/s/ THOMAS N. MCCARTER III

Thomas N. McCarter III 	 	Director 	
 	
/s/ ERNST SCHWEIZER

Ernst Schweizer 	 	Director 	
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EXHIBIT INDEX 
 	 	 	 	 	
Exhibit			
Number		Description	
			
 	3.1	 	 	Amended and Restated Articles of Incorporation of Hyseq, Inc., as amended(1) 	
 	3.2	 	 	Amended and Restated By-Laws of Hyseq, Inc.(9) 	
 	3.3	 	 	Amendment No. 3 to Amended and Restated Articles of Incorporation of Hyseq, Inc.(10) 	
 	4.1	 	 	Specimen Common Stock certificate(1) 	
 	4.2	 	 	Form of Registration Rights Agreement(1) 	
 	4.3	 	 	Form of Warrant Agreement(1) 	
 	4.4	 	 	Rights Agreement between Hyseq, Inc. and U.S. Stock Transfer dated June 5, 1998(2) 	
 	4.5	 	 	Form of Securities Purchase Agreement, dated as of August 28, 2001, by and among Hyseq, Inc. and the investors party thereto.(10) 	
 	4.6	 	 	Form of Registration Rights Agreement, dated as of August 28, 2001, by and among Hyseq, Inc. and the investors party thereto.(10) 	
 	4.7	 	 	Form of Warrant, dated as of August 28, 2001(10) 	
 	4.8	 	 	Hyseq Promissory Note, dated as of November 13, 2001, in the principal amount of $4,000,000 	
 	4.9	 	 	Registration Rights Agreement, dated as of November 13, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	4.10	 	 	Pledge and Security Agreement, dated as of November 13, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	10.1	 	 	Form of Indemnification Agreement between Hyseq, Inc. and each of its directors and officers(1) 	
 	10.2	 	 	Stock Option Plan, as amended†(3) 	
 	10.3	 	 	Non-Employee Director Stock Option Plan, as amended†(4) 	
 	10.4	 	 	Patent License Agreement between Arch Development Corporation and Hyseq, Inc. dated June 7, 1994(1) 	
 	10.5	 	 	Stock Purchase Agreement for Series B Convertible Preferred Stock dated May 28, 1997(1) 	
 	10.6	 	 	Collaboration and License Agreement between Hyseq Inc. and Chiron Corporation dated May 30, 1997(1) 	
 	10.7	 	 	Collaboration Agreement between Hyseq Inc. and The Perkin-Elmer Corporation dated May 30, 1997(1) 	
 	10.8	 	 	Employee Stock Purchase Plan†(5) 	
 	10.9	 	 	Non-Qualified Employee Stock Purchase Plan(8) 	
 	10.10	 	 	Scientific Advisory Board/ Consultants Stock Option Plan(8) 	
 	10.11	 	 	Collaboration and License Agreement between Hyseq, Inc. and American Cyanamid Company dated December 10, 1999(6) 	
 	10.12	 	 	Line of Credit Agreement between Hyseq, Inc. and Dr. George B. Rathmann dated November 10, 2000(7) 	
 	10.13	 	 	Employment and Confidential Information Agreement between Hyseq, Inc. and Ted W. Love dated January 11, 2001(9) 	
 	10.14	 	 	Industrial Multi-Tenant Lease by and between AMB Property, L.P. and Hyseq, Inc. dated June 23, 2000, as amended(9) 	
 	10.15	 	 	Lease between The Irvine Company and Hyseq, Inc. dated as of April 30, 2001(11) 	
 	10.16	 	 	Collaboration and License Agreement, dated as of June 29, 2001, by and between Hyseq, Inc. and Aurora Biosciences Corporation, 	
 	10.17	 	 	Collaboration Agreement, dated as of August 21, 2001, by and between Hyseq, Inc. and Kirin Brewery Company, Ltd. 	
 	10.18	 	 	Secreted Protein Development and Collaboration Agreement, dated as of October 9, 2001, by and between Hyseq, Inc. and Deltagen, Inc. 	
 	10.19	 	 	Line of Credit Agreement, dated as of August 6, 2001, by and between Hyseq, Inc. and Dr. George B. Rathmann 	

Table of Contents
 	 	 	 	 	
Exhibit			
Number		Description	
			
 	10.20	 	 	Settlement Agreement, dated as of October 24, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	10.21	 	 	Interference Settlement Agreement, dated as of October 24, 2001, by and between Hyseq, Inc. and Affymetrix, Inc. 	
 	10.22	 	 	Product Development and Supply Agreement, dated as of October 24, 2001, by and between N-Mer, Inc. and Affymetrix, Inc. 	
 	10.23	 	 	Product Solicitation Agreement, dated as of October 24, 2001, by and between N-Mer, Inc. and Affymetrix, Inc. 	
 	10.24	 	 	Option Agreement, dated as of October 24, 2001, by and among Affymetrix, Inc., Callida Genomics, Inc., and N-Mer, Inc. 	
 	10.25	 	 	Stock Option Agreement, dated as of February 1, 2000 by and between Hyseq, Inc. and Dr. George B. Rathmann 	
 	10.26	 	 	Stock Option Agreement, dated as of August 21, 2001 by and between Hyseq, Inc. and Dr. George B. Rathmann 	
 	21.1	 	 	Subsidiaries of Hyseq, Inc. as of December 31, 2001: Callida Genomics, Inc., a Delaware corporation; N-Mer, Inc., a Delaware corporation 	
 	23.1	 	 	Consent of KPMG LLP, Independent Auditors 	
 	23.2	 	 	Consent of Ernst & Young LLP, Independent Auditors 	

 	(1) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Registration Statement filed on Form S-1, as amended, File No. 333-29091. 	
 		
 	(2) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Form 8-K, filed on July 31, 1998, File No. 00-22873. 	
 		
 	(3) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Registration Statement on Form S-8, File No. 333-41663. 	
 		
 	(4) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Registration Statement on Form S-8, File No. 333-53089. 	
 		
 	(5) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Registration Statement on Form S-8, File No. 333-53087. 	
 		
 	(6) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our report on Form 8-K/ A, filed on March 17, 2000, File No. 00-22873. 	
 		
 	(7) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our report on Form 8-K, filed on December 14, 2000, File No. 000-22873. 	
 		
 	(8) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Annual Report on Form 10-K for the year ended December 31, 1999, File No. 000-22873. 	
 		
 	(9) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Annual Report on Form 10-K for the year ended December 31, 2000, File No. 000-22873. 	
		
(10) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our Registration Statement on Form S-3, as amended, filed on September 25, 2001, File No. 333-70134. 	
 		
(11) 	Previously filed with the Commission as an Exhibit to and incorporated herein by reference from our report on Form 8-K, filed on May 21, 2001, File No. 000-22873 	
		
     †	Denotes compensation plan in which an executive officer or director participates. 	

                                                                     EXHIBIT 4.8

THIS PROMISSORY NOTE AND ANY COMMON STOCK ISSUABLE UPON REPAYMENT HEREOF HAVE
NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), AND MAY NOT BE SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE
OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.

                                   HYSEQ, INC.
                                 PROMISSORY NOTE

Note No.  1

$4,000,000                                                     November 13, 2001
                                                           Sunnyvale, California

        FOR VALUE RECEIVED, Hyseq, Inc., a Nevada corporation, promises to pay
to Affymetrix, Inc., a Delaware corporation ("Affymetrix"), or its permitted
assigns (each of Affymetrix and any such assign, a "Holder"), the principal sum
of $4,000,000, or such lesser amount as shall then equal the outstanding
principal amount hereof, together with interest from the date of this Promissory
Note on the unpaid principal balance at a rate equal to 7.50% per annum,
computed on the basis of the actual number of days elapsed and a year of 360
days consisting of twelve 30-day months. All unpaid principal, together with any
then unpaid and accrued interest, shall be due and payable on the earlier of (i)
November 13, 2006 (the "Maturity Date") or (ii) the acceleration of the maturity
thereof in accordance with Section 6 of this Promissory Note.

        The obligations of the Company represented by this Promissory Note are
secured by a security interest as set forth in the Pledge and Security
Agreement, dated November 13, 2001 (the "Security Agreement"), between the
Company and Affymetrix.

        The Company has entered into a Registration Rights Agreement, dated as
of November 13, 2001 (the "Registration Rights Agreement"), with the Holder
providing for resales of all Common Stock held by the Holder issuable pursuant
to this Promissory Note.

        The following is a statement of the rights of the Holder and the
conditions to which this Promissory Note is subject, and to which the Holder
hereof, by the acceptance of this Promissory Note, agrees:

        1.     Definitions. As used in this Promissory Note, the following terms
shall have the meanings set forth below:

               (a) "Affiliate" shall mean with respect to any Person (i) any
other Person that directly or indirectly through one or more intermediaries
controls or is controlled by or is under common control with such Person, (ii)
any other Person owning or controlling 25% or more of the outstanding voting
securities of or other ownership interest in such Person or (iii) any officer,
director, general partner, managing partner or member of such Person.

               (b) "Aggregate Amount Outstanding" shall mean an amount equal to
the sum of (i) the outstanding principal amount hereunder, together with any
unpaid and accrued interest thereon, and (ii) the Other Amounts Outstanding.

               (c) "Ancillary Agreements" shall have the meaning ascribed to
such term in the Stock Purchase Agreement.

               (d) "Beneficial Owner" (and, with correlative meanings,
"Beneficially Own" and "Beneficial Ownership") of any interest shall mean a
Person who, together with his or its Affiliates, is or may be deemed a
beneficial owner of such interest for purposes of Rule 13d-3 or 13d-5 under the
Securities Exchange Act of 1934.

               (e) "Capital Lease Obligations" shall mean, with respect to any
Person, the obligation of such Person to pay rent or other amounts under any
lease with respect to any property (whether real, personal or mixed) acquired or
leased by such Person that is required to be accounted for under GAAP as a
liability on a consolidated balance sheet of such Person.

               (f) "CGI" shall mean Callida Genomics, Inc., a Delaware
corporation.

               (g) "Change-in-Control" shall mean (i) (x) any consolidation or
merger of the Company with or into any other corporation or other entity or
Person, or any other corporate reorganization, in which the stockholders of the
Company immediately prior to such consolidation, merger or reorganization own
less than 50% of the Company's voting power or the voting power of the surviving
entity or the ultimate parent of the surviving entity immediately after such
consolidation, merger or reorganization, or (y) any transaction or series of
related transactions not included in clause (x) to which the Company is a party
in which in excess of 50% of the Company's voting power is transferred to
another corporation, Person, entity or group for purposes of Section 13(d) under
the Securities Exchange Act of 1934, as amended, or (ii) a sale, lease or other
disposition of all or substantially all of the assets of the Company to any
other corporation, entity or Person; provided, however, that the consummation by
the Company of (A) a consolidation, merger, reorganization or other transaction
in which in excess of 50% the voting power of the surviving entity or the
ultimate parent of the surviving entity is owned, directly or indirectly, by
George B. Rathmann, Ph.D. (or any trust of which he is a trustee) immediately
after such consolidation, merger, reorganization or other transaction or (B) the
sale, lease or other disposition of all or substantially all of the Company's
assets to an entity in which in excess of 50% the voting power of such entity or
the ultimate parent of such entity is owned, directly or indirectly, by George
B. Rathmann, Ph.D. (or any trust of which he is a trustee) immediately after
such sale, lease or other disposition shall not be deemed a Change of Control
even if such consolidation, merger, reorganization or other transaction or sale,
lease or other disposition of assets would otherwise be deemed a Change of
Control pursuant to clause (i) or (ii) of this definition.

                (h) "Closing Price Per Share" shall mean, with respect to the
Common Stock, for any day, (i) the last reported sale price regular way on the
Nasdaq National Market or (ii) if the Common Stock is not quoted on the Nasdaq
National Market, the last reported sale price regular way per share or, in case
no such reported sale takes place on such day, the average of

                                       2

the reported closing bid and asked prices regular way, in either case, on the
principal national securities exchange on which the Common Stock is listed or
admitted to trading.

                (i) "Collateral" shall have the meaning ascribed to such term in
the Security Agreement.

                (j) "Common Stock" shall mean the Common Stock, par value $0.001
per share, of the Company authorized at the date hereof.

                (k) "Company" includes the corporation initially executing this
Promissory Note and any Person that shall succeed to or assume the obligations
of the Company under this Promissory Note.

                (l) "Determination Date" shall mean each day commencing on the
eleventh Trading Day after the date hereof and ending on the Maturity Date,
other than a Saturday or Sunday on which commercial banks in New York, New York
are not required or permitted under applicable laws or regulations to close.

                (m) "ECM Amount Due" shall mean an amount equal to the product
of (i) the Aggregate Amount Outstanding on any Determination Date minus (ii) the
product of the Equity Market Capitalization on any Determination Date multiplied
by 10%.

                (n) "Equity Market Capitalization", as of any Determination
Date, shall mean the product of (i) the average of the Closing Prices Per Share
of the Common Stock for the twenty (20) consecutive Trading Days immediately
preceding but excluding such Determination Date, multiplied by (ii) the number
of shares of Common Stock issued and outstanding as of such Determination Date.

                (o) "GAAP" or "Generally Accepted Accounting Principles" shall
mean generally accepted accounting principles as in effect from time to time in
the United States.

                (p) "Governmental Body" shall mean any foreign or domestic
government; court; federal, state, county, municipal or other department,
commission, board, bureau, agency, administrator, public authority or
instrumentality; arbitrator; mediator; or other governmental regulator or
authority.

                (q) "Indebtedness" shall mean, with respect to any Person, (i)
all obligations of such Person for borrowed money or for the deferred purchase
price of property or services (including all obligations, contingent or
otherwise, of such Person in connection with letters of credit, bankers'
acceptances, Interest Rate Protection Agreement or other similar instruments,
including currency swaps) other than indebtedness to trade creditors and service
providers incurred in the ordinary course of business and payable on usual and
customary terms, (ii) all obligations of such Person evidenced by bonds, notes,
debentures or other similar instruments, (iii) all indebtedness created or
arising under any conditional sale or other title retention agreement with
respect to property acquired by such Person (even though the remedies available
to the seller or lender under such agreement are limited to repossession or sale
of such property), (iv) all Capital Lease Obligations of such Person, (v) all
obligations of the types described in clauses (i), (ii), (iii) or (iv) above
secured by (or for which the obligee has an existing right,

                                       3

contingent or otherwise, to be secured by) any Lien upon or in any property
(including accounts, contract rights and other intangibles) owned by such
Person, even though such Person has not assumed or become liable for the payment
of such Indebtedness, (vi) all preferred stock issued by such Person which is
redeemable, prior to full satisfaction of the Company's obligations under this
Promissory Note, other than at the option of such Person, (vii) all Indebtedness
of others subject to a Third Party Guaranty by such Person and (viii) all
Indebtedness of any partnership of which such Person is a general partner.

                (r) "Interest Rate Protection Agreement" shall mean any interest
rate swap agreement, interest rate cap agreement or similar hedging arrangement
used by a Person to fix or cap a floating rate of interest on Indebtedness to a
negotiated maximum rate or amount.

                (s) "Lien" or "Liens" shall mean, with respect to any Person,
any security interest, pledge, mortgage, charge, option, assignment,
hypothecation, encumbrance, attachment, garnishment, sequestration, forfeiture,
execution or other voluntary or involuntary lien upon or affecting the revenues
of such Person or any real or personal property in which such Person has or
hereafter acquires any interest.

                (t) "Material Adverse Effect" shall mean an adverse effect upon
the business, financial condition, results of operations or prospects of the
Company, or upon the ability of the Company to perform its obligations hereunder
or under the Security Agreement, which adverse effect would be viewed as
material by a reasonably prudent lender.

                (u) "national securities exchange" shall mean a national
securities exchange registered under Section 6 of the Securities Exchange Act of
1934, as amended.

                (v) "Note Percentage" shall mean the quotient obtained by
dividing (i) the outstanding principal amount hereunder, together with any
unpaid and accrued interest thereon, by (ii) the Aggregate Amount Outstanding.

                (w) "Option" shall have the meaning ascribed to such term in the
Option Agreement, dated as of October 24, 2001, among CGI, N-Mer, Inc. and
Affymetrix.

                (x) "Other Amounts Outstanding" shall mean the aggregate
principal amount outstanding under all promissory notes (other than this
Promissory Note) of the Company in favor of the Holder, together with any unpaid
and accrued interest thereon.

                (y) "Person" shall mean an individual, corporation (including
any non-profit corporation), association, general or limited partnership,
organization, business, firm, limited liability company, joint venture, trust,
estate, or other entity, association or organization, whether constituting a
separate legal entity or not.

                (z) "Product Solicitation Agreement" shall have the meaning
ascribed to such term in the Stock Purchase Agreement.

                (aa) "Related Person" shall mean any Person with whom the
Company or one of its Affiliates has a contractual, licensing, collaborative,
partnership, joint venture or other similar relationship and any of such
Person's Affiliates.

                                       4

                (bb) "Related Agreements" shall have the meaning ascribed to
such term in the Stock Purchase Agreement.

                (cc) "Stock Purchase Agreement" shall mean the Preferred Stock
Purchase Agreement, dated as of October 24, 2001, among CGI, Affymetrix and the
Company.

                (dd) "Supply Agreement" shall have the meaning ascribed to such
term in the Stock Purchase Agreement.

                (ee) "Third Party Guaranty" means, with respect to any Person,
any obligation, contingent or otherwise, of such Person guaranteeing or having
the economic effect of guaranteeing any Indebtedness of any other Person (the
"primary obligor") in any manner, whether directly or indirectly, and including
any obligation of such Person, (i) to purchase or pay (or advance or supply
funds for the purchase or payment of) such Indebtedness, (ii) to purchase
property, securities or services for the purpose of assuring the holder of such
Indebtedness of the payment of such Indebtedness of (iii) to maintain working
capital, equity capital or the financial condition or liquidity of the primary
obligor so as to enable the primary obligor to pay such Indebtedness.

                (ff) "Trading Day" means (i) if the Common Stock is quoted on
the Nasdaq National Market, days on which trades may be effected through such
system or (ii) if the Common Stock is listed or admitted for trading on any
national securities exchange, days on which such national securities exchange is
open for business.

        2.      INTEREST. Accrued interest on this Promissory Note shall be
payable at such time as the outstanding principal amount hereof shall be paid in
full; provided, however, that in the event the principal amount hereof is not
repaid in full on the Maturity Date, accrued but unpaid interest on this
Promissory Note shall thereafter be paid in cash on the Maturity Date, the last
business day of each calendar month thereafter and on such date as the
outstanding principal amount hereof shall be paid in full.

        3.      PREPAYMENT. This Promissory Note may be prepaid by the Company
at any time in whole or in part without prepayment fee, premium or penalty by
payment of the unpaid principal amount, or part thereof, together with accrued
but unpaid interest. Any such prepayment shall be applied first to interest and
then to principal, or in such other order as the Holder may, in its sole
discretion, determine.

        4.     REPRESENTATIONS AND WARRANTIES.  The Company represents and
warrants to the Holder, as of the date of making this Promissory Note, as
follows:

               (a) GOOD STANDING AND POWER. The Company and each of its
subsidiaries is a corporation, duly incorporated and validly existing in good
standing under the laws of the jurisdiction of its incorporation; each has the
corporate power to own its property and to carry on its business as now being
conducted; and each is duly qualified to do business and is in good standing in
each jurisdiction in which the character of the properties owned or leased by it
therein or in which the transaction of its business makes such qualification
necessary, except where the failure to be so qualified, or to be in good
standing, individually or in the aggregate, could not reasonably be expected to
have a Material Adverse Effect.

                                       5

               (b) CORPORATE AUTHORITY. The Company has full corporate power and
authority to execute and deliver, and to incur and perform its obligations
under, this Promissory Note and the Security Agreement, which have been duly
authorized by all proper and necessary corporate action. No consent or approval
of stockholders is required as a condition to the validity or performance of, or
the exercise by the Holder of any of its rights or remedies under, this
Promissory Note or the Security Agreement.

               (c) AUTHORIZATIONS. All authorizations, consents, approvals,
registrations, notices, filings, exemptions and licenses (collectively
"Authorizations") with or from any Governmental Body or other Person necessary
for the execution, delivery and performance by the Company of, and the
incurrence and performance of its obligations under, each of this Promissory
Note and the Security Agreement, and the exercise by the Holder of its remedies
under each of this Promissory Note and the Security Agreement have been effected
or obtained and are in full force and effect, other than (i) such Authorizations
as may be required under applicable federal or state securities laws, which
Authorizations shall be obtained prior to the time required under such
securities laws, and (ii) such Authorizations as shall be required for the
perfection of the security interests under the Security Agreement, which shall
be obtained in accordance with the terms of the Security Agreement.

               (d) BINDING OBLIGATION. This Promissory Note and the Security
Agreement constitute the valid and legally binding obligations of the Company
enforceable in accordance with their terms, subject as to enforcement to
bankruptcy, insolvency, reorganization, moratorium and similar laws of general
applicability relating to or affecting creditors' rights and to general equity
principles.

               (e) NO CONFLICTS. There is no statute, regulation, rule, order or
judgment, and no provision of any agreement or instrument binding upon the
Company or any of its subsidiaries, or affecting their properties, and no
provision of the certificate of incorporation or by-laws (or similar
constitutive instruments) of the Company or any of its subsidiaries, that would
prohibit, conflict with or in any way impair the execution or delivery of, or
the incurrence or performance of any obligations of the Company under, this
Promissory Note or the Security Agreement, or result in or require the creation
or imposition of any Lien on property of the Company or any of its subsidiaries
as a consequence of the execution, delivery and performance of this Promissory
Note or the Security Agreement, other than in respect of the Authorizations
referenced in Section 4(c) hereof.

               (f) USE OF PROCEEDS. The proceeds of this Promissory Note will be
used by the Company exclusively for the purchase of shares of Series A Preferred
Stock, par value $0.001 per share, of CGI pursuant to the Stock Purchase
Agreement. The Company hereby authorizes and instructs Affymetrix to remit the
proceeds of this Promissory Note to CGI or its designee on behalf of the
Company. The Company acknowledges and agrees that CGI has authorized and
instructed Affymetrix to remit the proceeds of this Promissory Note to N-Mer,
Inc. pursuant to the Stock Purchase Agreement.

               (g) MARGIN REGULATIONS. This Promissory Note and the use of the
proceeds hereof as contemplated herein will not violate or be inconsistent with
any of the provisions of Regulation U, T or X (or any successor regulations) of
the Federal Reserve Board.

                                       6

               (h)    COMPLIANCE WITH LAWS AND CHARTER DOCUMENTS.

                      (i)    Neither the Company nor any of its subsidiaries is,
or as a result of performing any of its obligations under this Promissory Note
or the Security Agreement will be, in violation of (a) any law, statute, rule,
regulation or order of any Governmental Body applicable to it or its properties
or assets or (b) its certificate of incorporation, by-laws or any similar
document.

                      (ii)   The Company and each of its subsidiaries each has
all authorizations, consents, approvals, registrations, franchises, licenses and
permits, with or from Governmental Bodies and other Persons as are necessary for
it to own its properties and conduct its business as now conducted and the
absence of which could reasonably be expected, individually or in the aggregate,
to have a Material Adverse Effect.

        All representations and warranties made by the Company in this
Promissory Note shall (i) be considered to have been relied upon by the Holder,
(ii) survive this Promissory Note regardless of any investigation made by, or on
behalf of, the Holder, and (iii) continue in full force and effect as long as
any amount payable under this Promissory Note remains unpaid.

        5.     EVENTS OF DEFAULT.  Each of the following constitutes an event of
default under this Promissory Note (an "Event of Default"):

               (a) The Company shall fail duly to pay any principal hereof when
due, whether at maturity, by notice of intention to prepay or otherwise; or

               (b) The Company shall fail duly to pay any interest, fee or any
other amount payable under this Promissory Note within two (2) days after the
same shall be due; or

               (c) The Company shall fail duly to observe or perform any term,
covenant or agreement contained in, and required to be observed or performed by
it under, this Promissory Note or the Security Agreement, and such failure shall
have continued unremedied for a period of thirty (30) days after written notice
thereof; or

               (d) Any representation or warranty made by the Company in this
Promissory Note or the Security Agreement shall prove to have been false or
misleading in any material respect when so made or deemed made; or

               (e) A default or defaults under any bond(s), debentures(s),
note(s) or other evidence(s) of Indebtedness by the Company or any subsidiary of
the Company or under any mortgage(s), indenture(s) or instrument(s) under which
there may be issued or by which there may be secured or evidenced any
Indebtedness of such type by the Company or any such subsidiary with a principal
amount then outstanding, individually or in the aggregate, in excess of
$1,000,000, whether such Indebtedness now exists or shall hereafter be created,
which default with the passing of time or the giving of notice, or both, shall
give the holders of such bond(s), debenture(s), note(s), or other evidence(s) or
such Indebtedness the right to declare such obligation due and payable prior to
the date on which it would otherwise have become due and payable; or

                                       7

               (f) There shall be an event of default, default or breach under
any other promissory note of the Company in favor of the Holder; or

               (g) An involuntary case or other proceeding shall be commenced
against the Company or any of its subsidiaries seeking liquidation,
reorganization or other relief with respect to it or its debts under any
applicable bankruptcy, insolvency, reorganization or similar law or seeking the
appointment of a custodian, receiver, liquidator, assignee, trustee,
sequestrator or similar official of it or any substantial part of its property,
and such involuntary case or other proceeding shall remain undismissed and
unstayed or unbonded for a period of more than sixty (60) days; or an order or
decree approving or ordering any of the foregoing shall be entered and continued
unstayed and in effect; or

               (h) The Company or any of its subsidiaries shall commence a
voluntary case or proceeding under any applicable bankruptcy, insolvency,
reorganization or similar law or any other case or proceeding to be adjudicated
a bankrupt or insolvent, or any of them shall consent to the entry of a decree
or order for relief in respect of the Company or any of its subsidiaries in an
involuntary case or proceeding under any applicable bankruptcy, insolvency,
reorganization or other similar law or to the commencement of any bankruptcy or
insolvency case or proceeding against any of them, or any of them shall file a
petition or answer or consent seeking reorganization or relief under any such
applicable law, or any of them shall consent to the filing of such petition or
to the appointment of or taking possession by a custodian, receiver, liquidator,
assignee, trustee, sequestrator or similar official of the Company or any of its
subsidiaries or any substantial part of their respective property, or any of
them shall make a general assignment for the benefit of creditors, or any of
them shall admit in writing its inability to pay its debts generally as they
become due, or the Company or any of its subsidiaries shall take corporate
action in furtherance of any such action; or

               (i) One or more judgments against the Company or any of its
subsidiaries or attachments against its property, which at any time exceed in
the aggregate $1,000,000, or the operation or result of which is reasonably
likely to interfere materially and adversely with the conduct of the business of
the Company or any of its subsidiaries, remain unpaid, unstayed on appeal,
undischarged, unbonded, or undismissed for a period of more than sixty (60)
days; or

               (j) Any court or governmental or regulatory authority shall have
enacted, issued, promulgated, enforced or entered any statute, rule, regulation,
judgment, decree, injunction or other order (whether temporary, preliminary or
permanent) which is in effect and which prohibits, enjoins or otherwise
restricts the Company or any of its subsidiaries, in a manner that, individually
or in the aggregate, could reasonably be expected to have (i) a Material Adverse
Effect or (ii) an adverse effect upon the validity or enforceability of this
Promissory Note or the Security Agreement or upon the rights of the Holder
hereunder or under the Security Agreement, which adverse effect would be viewed
as material by a reasonably prudent lender.

        With respect to any Event of Default, (i) in any such event described in
Section 5(g) or (h), the principal amount hereof, together with any then unpaid
and accrued interest thereon, shall automatically be due and payable without
notice or demand or any action whatsoever by the Holder; and (ii) in all other
Events of Default the Holder may, upon written notice to the Company, declare
the principal amount hereof, together with any then unpaid and accrued

                                       8

interest thereon (or any part thereof), to be forthwith due and payable without
presentment, demand, protest or further notice of any kind, all of which are
hereby expressly waived by the Company.

        In addition, upon any Event of Default, the Holder may without prior
notice or demand, exercise any and all rights available to it under this
Promissory Note or the Security Agreement in equity or by applicable law. No
action taken by the Holder shall be deemed to be an election of remedies by the
Holder, it being the intent of the parties that the Holder shall be entitled
repeatedly to exercise all remedies separately or concurrently and in any manner
allowed by law.

        6.     ACCELERATION OF MATURITY.

               (a) EXERCISE OF OPTION. Upon the exercise by Affymetrix of the
Option, the outstanding principal amount hereof, together with any then unpaid
and accrued interest thereon, shall automatically be due and payable without
notice or demand or any action whatsoever by the Holder.

               (b) CHANGE-IN-CONTROL. Upon a Change-in-Control, the outstanding
principal amount hereof, together with any then unpaid and accrued interest
thereon, shall automatically be due and payable without notice or demand or any
action whatsoever by the Holder.

               (c) DELISTING OF COMMON STOCK. If at any time the Common Stock is
not approved for quotation on the Nasdaq National Market or listed on a national
securities exchange, the outstanding principal amount hereof, together with any
then unpaid and accrued interest thereon, shall automatically be due and payable
without notice or demand or any action whatsoever by the Holder.

               (d) IMPAIRMENT. If the Equity Market Capitalization on any
Determination Date is less than $50 million and the loan evidenced hereby (after
considering the realizable value of the Collateral) is impaired such that
Affymetrix reasonably determines that carrying the outstanding principal amount
hereof, together with any then unpaid and accrued interest thereon, on
Affymetrix' balance sheet at a value equal to the aggregate amount of principal
and interest outstanding under this Promissory Note is not in conformity with
GAAP, the Holder may, upon written notice to the Company, declare the
outstanding principal amount hereof, together with any then unpaid and accrued
interest thereon, to be forthwith due and payable.

               (e) BANKRUPTCY OF CGI. The outstanding principal amount hereof,
together with any then unpaid and accrued interest thereon, shall automatically
be due and payable without notice or demand or any action whatsoever by the
Holder if: (i) an involuntary case or other proceeding shall be commenced
against CGI or any of its subsidiaries seeking liquidation, reorganization or
other relief with respect to it or its debts under any applicable bankruptcy,
insolvency, reorganization or similar law or seeking the appointment of a
custodian, receiver, liquidator, assignee, trustee, sequestrator or similar
official of it or any substantial part of its property, and such involuntary
case or other proceeding shall remain undismissed and unstayed or unbonded for a
period of more than sixty (60) days; or an order or decree approving or ordering
any of the foregoing shall be entered and continued unstayed and in effect; or
(ii) CGI

                                        9

or any of its subsidiaries shall commence a voluntary case or proceeding under
any applicable bankruptcy, insolvency, reorganization or similar law or any
other case or proceeding to be adjudicated a bankrupt or insolvent, or any of
them shall consent to the entry of a decree or order for relief in respect of
CGI or any of its subsidiaries in an involuntary case or proceeding under any
applicable bankruptcy, insolvency, reorganization or other similar law or to the
commencement of any bankruptcy or insolvency case or proceeding against any of
them, or any of them shall file a petition or answer or consent seeking
reorganization or relief under any such applicable law, or any of them shall
consent to the filing of such petition or to the appointment of or taking
possession by a custodian, receiver, liquidator, assignee, trustee, sequestrator
or similar official of CGI or any of its subsidiaries or any substantial part of
their respective property, or any of them shall make a general assignment for
the benefit of creditors, or any of them shall admit in writing its inability to
pay its debts generally as they become due, or CGI or any of its subsidiaries
shall take corporate action in furtherance of any such action; or (iii) CGI or
any of its subsidiaries shall be dissolved, liquidated or wound up or CGI or any
of its subsidiaries shall take corporate action in furtherance of any such
action.

               (f) LITIGATION AGAINST AFFYMETRIX. If the Company or any of its
Affiliates or any Related Person commences any suit, action, litigation or
administrative or judicial action or proceeding or arbitration proceeding (each
a "Proceeding") against Affymetrix or any of its Affiliates in connection with
Affymetrix' investment or proposed investment in, or relationship or licensing
arrangement with, the Company, CGI or N-Mer, Inc., excluding any Proceeding
arising solely out of any breach or alleged breach by Affymetrix under any of
the Related Agreements, the Ancillary Agreements or the Confidentiality
Agreement, dated August 22, 2001, between the Company and Affymetrix, the Holder
may, upon written notice to the Company, declare the outstanding principal
amount hereof, together with any then unpaid and accrued interest thereon, to be
forthwith due and payable.

               (g) SALE OF INTEREST IN CGI. Upon the sale, assignment, transfer
or other disposition by the Company of any securities of CGI held by the
Company, an amount of outstanding principal hereof, together with any then
unpaid and accrued interest thereon, equal to the product of (i) the Note
Percentage and (ii) the aggregate amount of gross proceeds (net of discounts,
commissions or fees paid to brokers by the Company) received by the Company upon
such sale, assignment, transfer or other disposition shall automatically be due
and payable without notice or demand or any action whatsoever by the Holder.

               (h) EQUITY MARKET CAPITALIZATION. If the Aggregate Amount
Outstanding on any Determination Date is more than 10% of the Equity Market
Capitalization on such Determination Date, an amount of outstanding principal
hereof, together with any then unpaid and accrued interest thereon, equal to the
product of (i) the Note Percentage and (ii) the ECM Amount Due shall
automatically be due and payable without notice or demand or any action
whatsoever by the Holder.

        7.     SUCCESSORS AND ASSIGNS. Subject to the restrictions on transfer
described in Section 9 below, the rights and obligations of the Company and the
Holder shall be binding upon and benefit the successors, assigns, heirs,
administrators and transferees of the parties.

                                       10

        8.     WAIVER AND AMENDMENT. Any provision of this Promissory Note may
be amended, waived or modified upon the written consent of the Company and
Affymetrix.

        9.     ASSIGNMENT. Neither this Promissory Note nor the Security
Agreement, and none of the rights, interests or obligations hereunder or
thereunder, may be assigned, by operation of law or otherwise, in whole or in
part, by the Company without the prior written consent of the Holder. This
Promissory Note and the Security Agreement, and all of the rights, interests or
obligations hereunder or thereunder, may be assigned, sold or transferred by
operation of law or otherwise, in whole or in part, by the Holder; provided that
prior thereto, if reasonably requested by the Company, the Holder shall furnish
the Company with an opinion of counsel or other information or documentation,
reasonably satisfactory to the Company, that such assignment, sale or transfer
will not require registration of this Promissory Note under the Securities Act.
It is agreed that the Company will not require opinions of counsel for
transactions made pursuant to Rule 144 except in unusual circumstances. Any
assignment contrary to the provisions of this Section 9 shall be null and void.

        10.    ADDRESSES FOR NOTICES, ETC. Any notices and other communications
required or permitted under this Agreement shall be effective if in writing and
delivered personally or sent by telecopier, Federal Express or registered or
certified mail, postage prepaid, addressed as follows:

If to the Holder, to:         Affymetrix, Inc.
                              3380 Central Expressway
                              Santa Clara, California  95051
                              Telephone:  (408) 731-5000
                              Telecopier:  (408) 731-5394
                              Attention:  General Counsel

with a copy to:               Sullivan & Cromwell
                              1870 Embarcadero Road
                              Palo Alto, California  94303
                              Telephone:  (650) 461-5600
                              Telecopier:  (650) 461-5700
                              Attention:  John L. Savva, Esq.

If to the Company, to:        Hyseq, Inc.
                              670 Almanor Avenue
                              Sunnyvale, California  94085
                              Telephone:  (408) 524-8100
                              Telecopier:  (408) 524-8141
                              Attention:  General Counsel

                                       11

with a copy to:               Latham & Watkins
                              135 Commonwealth Drive
                              Menlo Park, California 94025
                              Telephone:  (650) 328-4600
                              Telecopier:  (650) 463-1600
                              Attention:  Alan C. Mendelson, Esq.

        Unless otherwise specified herein, such notices or other communications
shall be deemed effective (a) on the date delivered, if delivered personally,
(b) two business days after being sent, if sent by Federal Express or other
commercial overnight delivery service, (c) one business day after being sent, if
sent by telecopier with confirmation of good transmission and receipt, and (d)
three business days after being sent, if sent by registered or certified mail.
Each of the parties hereto shall be entitled to specify another address by
giving notice as aforesaid to each of the other parties hereto.

        11.    PAYMENT. Payments of principal and interest pursuant to this
Promissory Note shall be made by the Company in lawful tender of the United
States in immediately available funds.

        12.    EXCHANGE.

               (a) RIGHT TO EXCHANGE. The Company shall have the right, at its
option, at any time prior to payment in full of the principal balance of, and
all interest accrued on, this Note, to exchange this Note, in accordance with
the provisions of this Section 12, in whole or in part, into fully paid and
nonassessable shares of Common Stock. The number of shares of Common Stock (the
"Exchange Shares") deliverable upon exchange of such amount of principal and
interest (the "Exchange Amount") shall be such number of shares as has a fair
market value as of the date of exchange (the "Exchange Date") equal to the
Exchange Amount. For purposes of this Section 12, the fair market value of
shares of Common Stock shall be deemed equal to 90% of the average of the
Closing Prices Per Share of the Common Stock for the ten (10) consecutive
Trading Days immediately preceding and including the second Trading Day prior to
the Exchange Date.

               (b) EXCHANGE CONDITIONS. The right of the Company to undertake an
exchange pursuant to this Section 12 shall be subject to satisfaction or waiver
by the Holder of the following conditions:

                   (i) Issuance of Exchange Shares to the Holder in the exchange
shall not cause the Holder to Beneficially Own a number of shares of Common
Stock that exceeds the product of (i) 19% multiplied by (ii) the number of
shares of Common Stock outstanding on the Exchange Date;

                   (ii) (A) The Company shall have filed a registration
statement pursuant to Rule 415 under the Securities Act (the "Shelf Registration
Statement") with the Securities and Exchange Commission (the "Commission"),
which Shelf Registration Statement provides for resales of all Registrable
Securities (as such term is defined in the Registration Rights Agreement) held
by the Holder issued or issuable pursuant to this Promissory Note,

                                       12

(B) such Shelf Registration Statement has been declared effective by the
Commission and is effective at the time of delivery of such Registrable
Securities pursuant to this Section 12, (C) such Shelf Registration Statement
and the related prospectus is usable for resales of Registrable Securities by
the Holder at the time of delivery of Registrable Securities pursuant to this
Section 12 (it being understood that a Shelf Registration Statement shall not be
deemed unusable because of the failure by the Holder to furnish information,
following a written request by the Company, required for inclusion therein) and
(D) such Shelf Registration Statement conforms with the requirements of the
Registration Rights Agreement and the Securities Act and the rules and
regulations of the Commission promulgated thereunder as announced from time to
time;

                   (iii) Any registration with or approval of any governmental
authority under any state law or any federal law required in connection with the
valid issuance and delivery of the Exchange Shares shall have been completed and
become effective;

                   (iv) (A) The Exchange Shares shall, subject to notice of
issuance, have been approved for quotation on the Nasdaq National Market or
listed on a national securities exchange and (B) any required approvals for
quotation of the Exchange Shares on the Nasdaq National Market (or, if the
Common Stock is then listed on a national securities exchange, any required
approvals for listing of the Exchange Shares on such exchange), shall have been
obtained;

                   (v) The Exchange Shares shall be issued out of the Company's
authorized but unissued Common Stock and shall, upon issue, be duly and validly
issued and fully paid and non-assessable and free of any preemptive or similar
rights; and

                   (vi) The Company and its Board of Directors shall have taken
all necessary action, if any, in order to render inapplicable any control share
acquisition, business combination, poison pill (including any distribution under
a rights agreement) or other similar anti-takeover provision under the Company's
Certificate of Incorporation (or similar charter documents) or the laws of its
state of incorporation or any other jurisdiction (collectively, "Anti-Takeover
Provisions") that is or could reasonably be expected to become applicable to the
Holder as a result of the Company and the Holder fulfilling their obligations or
exercising their rights under this Promissory Note and the Registration Rights
Agreement, including, without limitation, the Company's issuance of Exchange
Shares pursuant to this Section 12 and the Holders' ownership of such Exchange
Shares. The Company agrees that no claim shall be made or enforced by the
Company that the Holder is an "Acquiring Person" (or similar triggering person)
under any shareholders rights plan or other Anti-Takeover Provision in effect or
hereafter adopted by the Company, or that the Holder could be deemed to trigger
the provisions of any such plan or arrangement, by virtue of receiving Exchange
Shares pursuant to this Section 12.

               (c) EXCHANGE PROCEDURE. Written notice (an "Exchange Notice") of
the Company's election to exchange shall be delivered to the Holder pursuant to
Section 10 hereof notifying the Holder of the exchange, specifying the principal
amount of, and accrued interest on, the Note to be exchanged, the date on which
such exchange is expected to occur and calling upon the Holder to surrender to
the Company, in the manner and at the place designated, this

                                       13

Promissory Note. As soon as practicable following surrender by the Holder of
this Promissory Note, the Company shall issue and deliver to the Holder a
certificate or certificates for the number of Exchange Shares to which the
Holder shall be entitled upon such exchange (bearing such legends as are
required under applicable state and federal securities laws), together with a
new Promissory Note representing any amounts of principal and interest then
outstanding under this Promissory Note and not then exchanged and a check
payable to the Holder for any cash amounts payable as described in Section
12(d).

               (d) FRACTIONAL SHARES; EFFECT OF EXCHANGE. No fractional shares
shall be issued upon exchange of this Promissory Note. In lieu thereof, the
Company shall pay to the Holder an amount equal to the product obtained by
multiplying (i) the average of the Closing Prices Per Share of the Common Stock
for the ten (10) consecutive Trading Days immediately preceding and including
the second Trading Day prior to the Exchange Date by (ii) the fraction of a
share not issued pursuant to the previous sentence. Upon exchange of this
Promissory Note in full and the payment of the amounts specified in this Section
12(d), the Company shall be forever released from all its obligations and
liabilities under this Promissory Note (except for liabilities arising out of or
relating to the breach of any representation, warranty, covenant or agreement by
the Company contained in this Promissory Note).

               (e) SHELF REGISTRATION STATEMENT. Notwithstanding any provision
to the contrary contained in the Registration Rights Agreement, the Company
shall keep the Shelf Registration Statement continuously effective for a period
of sixty (60) days from the time of delivery of Registrable Securities pursuant
to this Section 12 and shall ensure that such Shelf Registration Statement and
the related prospectus are continuously usable during such period for resales by
the Holders of Registrable Securities.

        13.    MAXIMUM AMOUNT OF INTEREST. Notwithstanding any contrary
provision, the total liability of the Company for payment of interest hereunder
shall not exceed the maximum amount of interest permitted by law, and if any
payment made by the Company includes interest in excess of such a maximum
amount, the Holder shall at any time before or after default apply such excess
to the reduction of principal hereunder.

        14.    SET-OFF. The Company hereby authorizes the Holder upon the
occurrence of an Event of Default and at any time and from time to time during
the continuance thereof, to the fullest extent permitted by law, to set-off and
apply any and all Indebtedness at any time owing by such Holder to or for the
credit or the account of the Company against any of the obligations of the
Company, now or hereafter existing under this Promissory Note, irrespective of
whether the Holder shall have made any demand under this Promissory Note and
although such obligations may be unmatured. The rights of the Holder under this
Section 14 are in addition to other rights and remedies (including other rights
of set-off) which the Holder may have. The Holder shall give notice thereof to
the Company concurrently with or prior to the exercise of such rights; provided,
however, that failure to give such notice shall not affect the validity of such
exercise.

        15.    SEVERABILITY. The holding of any provision of this Promissory
Note to be invalid or unenforceable by a court of competent jurisdiction shall
not affect any other provisions and the other provisions of this Promissory Note
shall remain in full force and effect.

                                       14

        16. GOVERNING LAW; VENUE. This Promissory Note shall be governed by and
construed and enforced in accordance with the internal laws of the State of
California. This Promissory Note shall be deemed to have been made in California
and the validity of this Promissory Note, its construction, interpretation and
enforcement, shall be determined under, governed by and construed in accordance
with the laws of California. In any court proceeding, the Company agrees to
submit to the jurisdiction of the state or federal court selected by the Holder,
and venue of any action concerning this Promissory Note or the Security
Agreement shall be in the county of Santa Clara in the State of California. The
Company hereby irrevocably waives to the fullest extent permitted by law any
objection which it may now or hereafter have to the laying of such venue and any
claim that any such forum is an inconvenient forum. Nothing in this Section 16
shall impair the right of the Holder to bring any action or proceeding against
the Company or its property in the courts of any other county or jurisdiction.

        17. EXPENSES. The Company agrees to pay all out-of-pocket expenses of
the Holder (including the reasonable fees and expenses of Sullivan & Cromwell,
as counsel for Affymetrix) in connection with the enforcement of any provision
of this Promissory Note and the Security Agreement and any amendment or
supplement hereto or thereto and the collection of this Promissory Note.

                                       15

        IN WITNESS WHEREOF, the Company has caused this Promissory Note to be
issued as of the date first written above.

                                   HYSEQ, INC.,
                                   a Nevada corporation

                                   By:  /s/ GEORGE B. RATHMANN
                                      -----------------------------
                                      Name:  George B. Rathmann
                                      Title: Chairman of the Board
                                             of Directors

                                                                     EXHIBIT 4.9

                         REGISTRATION RIGHTS AGREEMENT

        This Registration Rights Agreement (this "Agreement") is made and
entered into as of November 13, 2001, among Hyseq, Inc., a Nevada corporation
(the "Company"), and Affymetrix, Inc. a Delaware corporation (the "Investor").

        WHEREAS, pursuant to the Preferred Stock Purchase Agreement, dated as of
the date hereof (the "Stock Purchase Agreement"), by and among Callida Genomics,
Inc., a Delaware corporation, the Investor and the Company, the Investor has
agreed to extend credit to the Company and to purchase one or more Promissory
Notes of the Company (collectively, the "Promissory Notes"); and

        WHEREAS, the extension of credit to the Company pursuant to the
Promissory Notes and the purchase of the Promissory Notes is conditioned upon
the execution and delivery by the Company of this Agreement.

        NOW THEREFORE, the Company and the Investor hereby agree as follows:

        1. DEFINITIONS.

        Terms used and not otherwise defined herein that are defined in the
Promissory Notes, shall have the meanings given such terms in the Promissory
Notes. As used in this Agreement, the following terms shall have the following
meanings:

        "Closing Date" shall have the meaning ascribed to such term in the Stock
Purchase Agreement.

        "Commission" means the United States Securities and Exchange Commission,
or any other federal agency at the time administering the Exchange Act or the
Securities Act, whichever is the relevant statute for the particular purpose.

        "Common Stock" means the Company's common stock, par value $0.001 per
share.

        "Effectiveness Date" means the 180th day following the Closing Date.

        "Effectiveness Period" shall have the meaning set forth in Section 2(a).

        "Event" shall have the meaning set forth in Section 2(b).

        "Event Date" shall have the meaning set forth in Section 2(b).

        "Event Notice Date" shall have the meaning set forth in Section 2(b).

        "Exchange Act" means the United States Securities Exchange Act of 1934,
as amended.

        "Exercise Notice" shall have the meaning set forth in Section 2(b).

        "Filing Date" means the 60th day following the Closing Date.

        "Holder" means the beneficial owner of Registrable Securities. For all
purposes of this Agreement, the Company shall be permitted to treat the record
owner of Registrable Securities as the beneficial owner thereof unless the
Company has been given written notice of the existence and identity of a
different beneficial owner.

        "Indemnified Party" shall have the meaning set forth in Section 5(c).

        "Indemnifying Party" shall have the meaning set forth in Section 5(c).

        "Losses" shall have the meaning set forth in Section 5(a).

        "Materially Detrimental" means, in the good faith judgment of the Board
of Directors of the Company as set forth in a certificate signed by the
President, Chief Financial Officer or General Counsel of the Company, the filing
in question would be materially detrimental to the Company by reason of (i) any
Proceeding before, or material event involving, the Food and Drug
Administration, or (ii) any proposal or plan of the Company or any of its
subsidiaries to engage in any sale, acquisition, merger, consolidation,
reorganization, tender offer or similar transaction.

        "Note Holder" means the beneficial owner of a Promissory Note. For all
purposes of this Agreement, the Company shall be permitted to treat the record
owner of Promissory Notes as the beneficial owner thereof unless the Company has
been given written notice of the existence and identity of a different
beneficial owner.

        "Option Price" as of a specified date means the quotient obtained by
dividing (i) the aggregate principal and interest under Promissory Notes that
has theretofore been exchanged for the Option Shares and (ii) the total number
of Option Shares (as adjusted for stock splits, stock dividends,
recapitalizations and the like) theretofore issued.

        "Option Shares" shall have the meaning set forth in Section 2(b).

        "Person" shall mean an individual, corporation (including any non-profit
corporation), association, general or limited partnership, organization,
business, firm, limited liability company, joint venture, trust, estate, or
other entity, association or organization, whether constituting a separate legal
entity or not.

        "Proceeding" means an action, claim, suit, investigation or proceeding
(including, without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

        "Promissory Notes" shall have the meaning set forth in the recitals
hereto.

                                       2

        "Prospectus" means the prospectus included in a Registration Statement
(including, without limitation, a prospectus that includes any information
previously omitted from a prospectus filed as part of an effective registration
statement in reliance upon Rule 430A promulgated under the Securities Act), as
amended or supplemented by any prospectus supplement, with respect to the terms
of the offering of any portion of the Registrable Securities covered by the
Registration Statement, and all other amendments and supplements to the
Prospectus, including post-effective amendments, and all material incorporated
by reference or deemed to be incorporated by reference in such Prospectus.

        "Put Period" means a period of sixty (60) days commencing at the time
each Registrable Security is delivered to a Holder pursuant to the Promissory
Notes.

        "Puttable Securities" shall have the meaning set forth in Section 2(b).

        "Registrable Securities" means any Security except any Security which
(i) has been effectively registered under the Securities Act and sold in a
manner contemplated by a Registration Statement or (ii) has been transferred in
compliance with Rule 144 or is transferable pursuant to paragraph (k) of Rule
144.

        "Registration Statement" means the registration statement required to be
filed hereunder including the Prospectus, amendments and supplements to such
registration statement or Prospectus, including pre- and post-effective
amendments, all exhibits thereto, and all material incorporated by reference or
deemed to be incorporated by reference in such registration statement.

        "Rule 144" means Rule 144 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same purpose and effect as such Rule.

        "Rule 415" means Rule 415 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same purpose and effect as such Rule.

        "Rule 424" means Rule 424 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same purpose and effect as such Rule.

        "Security" and "Securities" means all or any portion of the shares of
Common Stock issued or issuable from time to time in exchange for any amounts
due under the Promissory Notes; and any securities issued successively in
exchange for or in respect of any of the foregoing, whether pursuant to a merger
or consolidation, as a result of any successive stock split or reclassification
of, or stock dividend on, any of the foregoing or otherwise.

                                       3

        "Securities Act" means the United States Securities Act of 1933, as
amended.

        "Special Counsel" means Sullivan & Cromwell, special counsel to the
Investor, for so long as the Investor shall be a Holder or a Note Holder.

        "Stock Purchase Agreement" shall have the meaning set forth in the
recitals hereto.

        "Trading Market" means the Nasdaq National Market or any national
securities exchange, market or trading or quotation facility on which the Common
Stock is then listed or quoted.

        2.     REGISTRATION.

               (a) On or prior to the Filing Date, the Company shall prepare and
file with the Commission a Registration Statement covering the offer and sale of
all Registrable Securities for an offering to be made on a continuous or delayed
basis by the Holders pursuant to Rule 415 (if the Company files such
Registration Statement without affording the Holders the opportunity to review
and comment on the same as required by Section 3(a) hereof, the Company shall
not be deemed to have satisfied this requirement). The Registration Statement
shall be on Form S-3 (except if such form is not then available to the Company,
in which case such registration shall be on another appropriate form in
accordance herewith) and shall contain (except if otherwise directed by the
Holders) the "Plan Of Distribution" attached hereto as Annex A. The Company
shall use commercially reasonable efforts to cause the Registration Statement to
be declared effective under the Securities Act prior to the Effectiveness Date,
and shall use commercially reasonable efforts to keep the Registration Statement
continuously effective under the Securities Act for so long as there shall
remain outstanding any Registrable Securities or any principal or interest is
outstanding under the Promissory Notes (the "Effectiveness Period"); provided,
that the Company shall not be deemed to have used its commercially reasonable
efforts to keep the Registration Statement effective during the Effectiveness
Period if it voluntarily takes any action that would result in the Holders not
being able to sell the Registrable Securities covered by such Registration
Statement during the Effectiveness Period, unless such action is required under
applicable law or the Company has filed a post-effective amendment to the
Registration Statement and the Commission has not declared it effective.

               (b) If, at any time during a Put Period, (i) a Registration
Statement ceases to be effective as to all Registrable Securities to which it is
required to relate at any time prior to the expiration of the Effectiveness
Period without being succeeded within ten Trading Days, or if it would be
Materially Detrimental, twenty Trading Days, by an amendment to such
Registration Statement or by a subsequent Registration Statement filed with and
declared effective by the Commission, (ii) an amendment to a Registration
Statement is not filed by the Company with the Commission within ten Trading
Days or if it would be Materially Detrimental, twenty Trading Days, of the
Commission's notifying the Company that such amendment is required in order for
such

                                       4

Registration Statement to be declared effective, (iii) the Common Stock is not
listed or quoted, or is suspended from trading, on the Trading Market for a
period of three Trading Days in such Put Period (which need not be consecutive
Trading Days) or (iv) the Company at any time fails to comply with Section 3(l)
hereof (any such failure or breach being referred to as an "Event" and for
purposes of clauses (i) and (ii) the date on which the applicable Trading
Day-period is exceeded, or for purposes of clause (iii) the date on which such
three Trading Day period is exceeded, or for purposes of clause (iv) the date on
which the Company fails to comply with Section 3(l) hereof, being referred to as
an "Event Date"), then each Holder, in addition to such other remedies as may be
available at law, in equity or hereunder, shall have the right, at such Holder's
option, to sell to the Company all or a portion of the Registrable Securities
delivered to such Holder at the commencement of, or at any time during, the Put
Period (such Registrable Securities being referred to herein as the "Puttable
Securities") on the following terms and conditions:

               (A) The Company shall deliver each Holder written notice of each
Event within three (3) days of such Event (the date of delivery of such notice
is referred to herein as the "Event Notice Date").

               (B) Each Holder may exercise its option to sell Puttable
Securities to the Company under this Section 2(b) at any time during the period
commencing on the Event Date and ending on the date that is thirty (30) days
after the Event Notice Date, by providing written notice of such exercise to the
Company (the "Exercise Notice"), which notice shall include the number of
Puttable Securities such Holder elects to sell to the Company pursuant to this
Section 2(b) (the "Option Shares"). The delivery of an Exercise Notice by a
Holder shall constitute an irrevocable commitment by such Holder to sell, and a
binding obligation of the Company to purchase, such Holder's Option Shares on
the terms and subject to the conditions set forth in this Section 2(b).

               (C) The purchase price per Option Share to be sold to the Company
under this Section 2(b) shall be the Option Price as of the date of the Exercise
Notice.

               (D) The Company shall reimburse each Holder for any and all fees
and expenses, including reasonable legal fees and expenses, incurred pursuant to
the exercise or the attempted exercise of such Holder's rights under this
Section 2(b).

               (E) The Company shall, within three (3) days of receipt of an
Exercise Notice and receipt of the certificate or certificates for the Option
Shares to be sold by a Holder under this Section 2(b), pay to the Holder the
aggregate purchase price therefor and the amount of fees and expenses
reimbursable under this Agreement in lawful tender of the United States in
immediately available funds.

                                       5

        3.     REGISTRATION PROCEDURES.

        In connection with the Company's registration obligations hereunder, the
Company shall:

               (a) Not less than (i) five Trading Days prior to the filing of
the Registration Statement or any related Prospectus, (ii) three Trading Days
prior to the filing of any pre-effective or post effective amendment to the
Registration Statement or (iii) one Trading Day prior to the filing of any
supplement to the Registration Statement (other than a prospectus supplement the
principal purpose of which is to update the list of selling stock holders), the
Company shall, (A) furnish to the Holders (or, if there is no Holder, the Note
Holders) and the Special Counsel copies of all such documents proposed to be
filed (including documents incorporated by reference and not available on the
EDGAR system) which documents will be subject to the review of such Holders (or,
if there is no Holder, the Note Holders) and the Special Counsel, and (B) cause
its officers and directors, counsel and independent certified public accountants
to respond to such inquiries as shall be necessary to conduct a reasonable
investigation within the meaning of the Securities Act. The Company shall not
file the Registration Statement or any such Prospectus or any amendments or
supplements thereto to which the Holders of a majority of the Registrable
Securities (or, if there is no Holder, the Note Holders) and the Special Counsel
shall reasonably object in good faith.

               (b) (i) Prepare and file with the Commission such amendments,
including post-effective amendments, to the Registration Statement and the
Prospectus used in connection therewith as may be necessary to keep the
Registration Statement continuously effective as to the applicable Registrable
Securities for the Effectiveness Period and prepare and file with the Commission
such additional Registration Statements in order to register for resale under
the Securities Act all of the Registrable Securities; (ii) cause the related
Prospectus to be amended or supplemented by any required Prospectus supplement,
and as so supplemented or amended to be filed pursuant to Rule 424; (iii)
respond as promptly as reasonably possible, and in any event within ten Trading
Days, to any comments received from the Commission with respect to the
Registration Statement or any amendment thereto and, as promptly as reasonably
possible provide the Holders (or, if there is no Holder, the Note Holders) true
and complete copies of all correspondence from and to the Commission relating to
the Registration Statement; and (iv) promptly take such action as may be
necessary so that each of the Registration Statement and any amendment thereto
and the Prospectus and any amendment or supplement thereto comply in all
material respects with the provisions of the Securities Act and the Exchange Act
and the respective rules and regulations thereunder.

               (c) Notify the Holders of Registrable Securities to be sold (or,
if there is no Holder, the Note Holders) and the Special Counsel as promptly as
reasonably possible (and, in the case of a post-effective amendment provided for
in (i)(A) below, not less than three Trading Days prior to such filing) and (if
requested by any such Person) confirm such notice in writing no later than one
Trading Day following the day (i)(A)

                                       6

when a Prospectus or any Prospectus supplement (other than a prospectus
supplement the principal purpose of which is to update the list of selling stock
holders) or post-effective amendment to the Registration Statement is proposed
to be filed; (B) when the Commission notifies the Company whether there will be
a "review" of such Registration Statement and whenever the Commission comments
in writing on such Registration Statement (the Company shall provide true and
complete copies thereof and all written responses thereto to each of the
Holders); and (C) with respect to the Registration Statement or any
post-effective amendment, when the same has become effective; (ii) of any
request by the Commission or any other Federal or state governmental authority
for amendments or supplements to the Registration Statement or Prospectus or for
additional information; (iii) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement covering any or
all of the Registrable Securities or the initiation of any Proceedings for that
purpose; (iv) of the receipt by the Company of any notification with respect to
the suspension of the qualification or exemption from qualification of any of
the Registrable Securities for sale in any jurisdiction, or the initiation or
threatening of any Proceeding for such purpose; and (v) of the occurrence of any
event or passage of time that makes the financial statements included in the
Registration Statement ineligible for inclusion therein or any statement made in
the Registration Statement or Prospectus or any document incorporated or deemed
to be incorporated therein by reference and not superseded untrue in any
material respect or that requires any post-effective amendment to the
Registration Statement or Prospectus so that, in the case of the Registration
Statement or the Prospectus, as the case may be, it will not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading.

               (d) Use its commercially reasonable efforts to avoid the issuance
of, or, if issued, obtain the withdrawal of (i) any Commission order suspending
the effectiveness of the Registration Statement, or (ii) any suspension of the
qualification (or exemption from qualification) of any of the Registrable
Securities for sale in any jurisdiction, at the earliest practicable moment.

               (e) Furnish to each Note Holder and each Holder and the Special
Counsel, without charge (i) at least one conformed copy of each Registration
Statement and each amendment thereto, including financial statements and
schedules and (ii) all documents incorporated or deemed to be incorporated
therein by reference, and all exhibits to the extent requested by such Person
(including those previously furnished or incorporated by reference) promptly
after the filing of such documents with the Commission; provided, that the
Company shall have no obligation to provide any document that is available on
the EDGAR system.

               (f) Subject to the provisions of Sections 3(c) and 6(d), the
Company (i) shall promptly deliver to each Note Holder and each Holder and the
Special Counsel, without charge, as many copies of the Prospectus or
Prospectuses (including each form of prospectus) and each amendment or
supplement thereto as such Persons may reasonably

                                       7

request, and (ii) hereby consents to the use of such Prospectus and each
amendment or supplement thereto by each of the selling Holders in connection
with the offering and sale of the Registrable Securities covered by such
Prospectus and any amendment or supplement thereto.

               (g) Prior to any public offering of Registrable Securities, use
its commercially reasonable efforts to register or qualify or cooperate with the
selling Holders and the Special Counsel in connection with the registration or
qualification (or exemption from such registration or qualification) of such
Registrable Securities for offer and sale under the securities or Blue Sky laws
of such jurisdictions within the United States as any Holder reasonably requests
in writing, to keep each such registration or qualification (or exemption
therefrom) effective during the Effectiveness Period and to do any and all other
acts or things necessary or advisable to enable the disposition in such
jurisdictions of the Registrable Securities covered by a Registration Statement;
provided, that the Company shall not be required to qualify generally to do
business in any jurisdiction where it is not then so qualified or subject the
Company to any material tax in any such jurisdiction where it is not then so
subject.

               (h) Cooperate with the Holders to facilitate the timely
preparation and delivery of certificates representing Registrable Securities to
be delivered to a transferee pursuant to a Registration Statement, which
certificates shall be free of all restrictive legends, and to enable such
Registrable Securities to be in such denominations and registered in such names
as any such Holders may request.

               (i) Upon the occurrence of any event contemplated by Section
3(c)(v), as promptly as reasonably possible, prepare a supplement or amendment,
including a post-effective amendment, to the Registration Statement or a
supplement to the related Prospectus or any document incorporated or deemed to
be incorporated therein by reference, and file any other required document so
that, as thereafter delivered, neither the Registration Statement nor such
Prospectus will contain an untrue statement of a material fact or omit to state
a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading.

               (j) Comply with all applicable rules and regulations of the
Commission, and make generally available to its securityholders as soon as
practicable, but in any event not later than eighteen months after (i) the
effective date (as defined in Rule 158(c) under the Securities Act) of the
Registration Statement, (ii) the effective date of each post-effective amendment
to the Registration Statement, and (iii) the date of each filing by the Company
with the Commission of an Annual Report on Form 10-K that is incorporated by
reference in the Registration Statement, an earning statement of the Company and
its subsidiaries complying with Section 11(a) of the Securities Act and the
rules and regulations of the Commission thereunder (including, at the option of
the Company, Rule 158).

                                       8

               (k) The Company may require each selling Holder to furnish to the
Company a certified statement as to the number of shares of Common Stock
beneficially owned by such Holder and, if requested by the Commission, the
controlling person thereof.

               (l) Notwithstanding any provision to the contrary contained in
this Agreement, keep the Registration Statement continuously effective for a
period of not less than sixty (60) days from each time of delivery of
Registrable Securities pursuant to the Promissory Note and ensure that such
Registration Statement and the related Prospectus are continuously usable during
such period for resales by the Holders of Common Stock.

               (m) Use its commercially reasonable efforts to take all other
steps necessary to effect the registration and offering of the Registrable
Securities covered by the Registration Statement contemplated hereby.

        4.     REGISTRATION EXPENSES.

        All fees and expenses incident to the performance of or compliance with
this Agreement by the Company shall be borne by the Company whether or not any
Registrable Securities are sold pursuant to the Registration Statement. The fees
and expenses referred to in the foregoing sentence shall include, without
limitation, (i) all registration and filing fees (including, without limitation,
fees and expenses (A) with respect to filings required to be made with the
Trading Market on which the Common Stock is then listed for trading, and (B) in
compliance with applicable state securities or Blue Sky laws), (ii) printing
expenses (including, without limitation, expenses of printing certificates for
Registrable Securities and of printing prospectuses if the printing of
prospectuses is reasonably requested by the holders of a majority of the
Registrable Securities included in the Registration Statement), (iii) messenger,
telephone and delivery expenses, (iv) fees and disbursements of counsel for the
Company, (v) Securities Act liability insurance, if the Company so desires such
insurance, and (vi) fees and expenses of all other Persons retained by the
Company in connection with the consummation of the transactions contemplated by
this Agreement. In addition, the Company shall be responsible for all of its
internal expenses incurred in connection with the consummation of the
transactions contemplated by this Agreement (including, without limitation, all
salaries and expenses of its officers and employees performing legal or
accounting duties), the expense of any annual audit and the fees and expenses
incurred in connection with the listing of the Registrable Securities on any
securities exchange as required hereunder.

        5.     INDEMNIFICATION.

        (a) Indemnification by the Company. The Company shall, notwithstanding
any termination of this Agreement, indemnify and hold harmless each Holder, the
officers, directors, agents, brokers (including brokers who offer and sell
Registrable Securities as principal as a result of a pledge or any failure to
perform under a

                                       9

margin call of Common Stock), investment advisors and employees of each of them,
each Person who controls any such Holder (within the meaning of Section 15 of
the Securities Act or Section 20 of the Exchange Act) and the officers,
directors, agents and employees of each such controlling Person, to the fullest
extent permitted by applicable law, from and against any and all losses, claims,
damages, liabilities, costs (including, without limitation, reasonable costs of
preparation and reasonable attorneys' fees) and expenses (collectively,
"Losses"), as incurred, arising out of or relating to any untrue or alleged
untrue statement of a material fact contained in the Registration Statement, any
Prospectus or in any amendment or supplement thereto or arising out of or
relating to any omission or alleged omission of a material fact required to be
stated therein or necessary to make the statements therein (in the case of any
Prospectus or supplement thereto, in light of the circumstances under which they
were made) not misleading, except to the extent, but only to the extent, that
(i) such untrue statements or omissions are based solely upon information
regarding such Holder furnished in writing to the Company by such Holder
expressly for use therein, or to the extent that such information relates to
such Holder or such Holder's proposed method of distribution of Registrable
Securities and was reviewed and expressly approved in writing by such Holder
expressly for use in the Registration Statement, such Prospectus or in any
amendment or supplement thereto (it being understood that the Holder has
approved Annex A hereto for this purpose) or (ii) the use by such Holder of an
outdated or defective Prospectus after the Company has notified such Holder in
writing that the Prospectus is outdated or defective and prior to the receipt by
such Holder of the Advice contemplated in Section 6(d). The Company shall notify
the Holders promptly of the institution, threat or assertion of any Proceeding
of which the Company is aware in connection with the transactions contemplated
by this Agreement.

               (b) Indemnification by Holders. Each Holder shall, severally and
not jointly, indemnify and hold harmless the Company, its directors, officers,
agents and employees, each Person who controls the Company (within the meaning
of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the
directors, officers, agents or employees of such controlling Persons, to the
fullest extent permitted by applicable law, from and against all Losses, as
incurred, arising solely out of or based solely upon: (i) such Holder's failure
to comply with the prospectus delivery requirements of the Securities Act
(provided that the Company has delivered a Prospectus to such Holder or a
Prospectus is otherwise available via the EDGAR system) or (ii) any untrue
statement of a material fact contained in any Registration Statement, any
Prospectus, or in any amendment or supplement thereto, or arising solely out of
or based solely upon any omission of a material fact required to be stated
therein or necessary to make the statements therein not misleading to the
extent, but only to the extent, that such untrue statement or omission is
contained in any information so furnished in writing by such Holder to the
Company specifically for inclusion in such Registration Statement or such
Prospectus or to the extent that (A) such untrue statements or omissions are
based solely upon information regarding such Holder furnished in writing to the
Company by such Holder expressly for use therein, or to the extent that such
information relates to such Holder or such Holder's proposed method of
distribution of Registrable Securities and

                                       10

was reviewed and expressly approved in writing by such Holder expressly for use
in the Registration Statement (it being understood that the Holder has approved
Annex A hereto for this purpose), such Prospectus or in any amendment or
supplement thereto or (B) the use by such Holder of an outdated or defective
Prospectus after the Company has notified such Holder in writing that the
Prospectus is outdated or defective and prior to the receipt by such Holder of
the Advice contemplated in Section 6(d). In no event shall the liability of any
selling Holder hereunder be greater in amount than the dollar amount of the net
proceeds received by such Holder upon the sale of the Registrable Securities
giving rise to such indemnification obligation.

               (c) Conduct of Indemnification Proceedings. If any Proceeding
shall be brought or asserted against any Person entitled to indemnity hereunder
(an "Indemnified Party"), such Indemnified Party shall promptly notify the
Person from whom indemnity is sought (the "Indemnifying Party") in writing, and
the Indemnifying Party shall assume the defense thereof, including the
employment of counsel reasonably satisfactory to the Indemnified Party and the
payment of all fees and expenses incurred in connection with defense thereof;
provided, that the failure of any Indemnified Party to give such notice shall
not relieve the Indemnifying Party of its obligations or liabilities pursuant to
this Agreement, except (and only) to the extent that such failure shall have
proximately and materially adversely prejudiced the Indemnifying Party. An
Indemnified Party shall have the right to employ separate counsel in any such
Proceeding and to participate in the defense thereof, but the fees and expenses
of such counsel shall be at the expense of such Indemnified Party or Parties
unless: (i) the Indemnifying Party has agreed in writing to pay such fees and
expenses; (ii) the Indemnifying Party shall have failed promptly to assume the
defense of such Proceeding and to employ counsel reasonably satisfactory to such
Indemnified Party in any such Proceeding; or (iii) the named parties to any such
Proceeding (including any impleaded parties) include both such Indemnified Party
and the Indemnifying Party, and such Indemnified Party shall have been advised
in writing by counsel that a conflict of interest is likely to exist if the same
counsel were to represent such Indemnified Party and the Indemnifying Party (in
which case, if such Indemnified Party notifies the Indemnifying Party in writing
that it elects to employ separate counsel at the expense of the Indemnifying
Party, the Indemnifying Party shall not have the right to assume the defense
thereof and such counsel shall be at the expense of the Indemnifying Party);
provided, that the Indemnifying Party shall not be liable for the fees and
expenses of more than one separate firm of attorneys at any time for all
indemnified parties. The Indemnifying Party shall not be liable for any
settlement of any such Proceeding effected without its written consent, which
consent shall not be unreasonably withheld. No Indemnifying Party shall, without
the prior written consent of the Indemnified Party, effect any settlement of any
pending Proceeding in respect of which any Indemnified Party is a party, unless
such settlement includes an unconditional release of such Indemnified Party from
all liability on claims that are the subject matter of such Proceeding. All fees
and expenses of the Indemnified Party (including reasonable fees and expenses to
the extent incurred in connection with investigating or preparing to defend such
Proceeding in a manner not inconsistent with this Section) shall be paid to the
Indemnified Party, as incurred, within

                                       11

ten Trading Days of written notice and reasonable documentation thereof to the
Indemnifying Party (regardless of whether it is ultimately determined that an
Indemnified Party is not entitled to indemnification hereunder; provided, that
the Indemnified Party shall reimburse all such fees and expenses to the extent
it is finally judicially determined that such Indemnified Party is not entitled
to indemnification hereunder).

               (d) Contribution. If a claim for indemnification under Section
5(a) or 5(b) is unavailable to an Indemnified Party (by reason of public policy
or otherwise), then each Indemnifying Party, in lieu of indemnifying such
Indemnified Party, shall contribute to the amount paid or payable by such
Indemnified Party as a result of such Losses, in such proportion as is
appropriate to reflect the relative fault of the Indemnifying Party and
Indemnified Party in connection with the actions, statements or omissions that
resulted in such Losses as well as any other relevant equitable considerations.
The relative fault of such Indemnifying Party and Indemnified Party shall be
determined by reference to, among other things, whether any action in question,
including any untrue or alleged untrue statement of a material fact or omission
or alleged omission of a material fact, has been taken or made by, or relates to
information supplied by, such Indemnifying Party or Indemnified Party, and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such action, statement or omission. The amount paid or
payable by a party as a result of any Losses shall be deemed to include, subject
to the limitations set forth in Section 5(c), any reasonable attorneys' or other
reasonable fees or expenses incurred by such party in connection with any
Proceeding to the extent such party would have been indemnified for such fees or
expenses if the indemnification provided for in this Section was available to
such party in accordance with its terms. The parties hereto agree that it would
not be just and equitable if contribution pursuant to this Section 5(d) were
determined by pro rata allocation or by any other method of allocation that does
not take into account the equitable considerations referred to in this Section
5(d). No person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to contribution from any
person who was not guilty of such fraudulent misrepresentation. Notwithstanding
the provisions of this Section 5(d), no Holder shall be required to contribute,
in the aggregate, any amount in excess of the amount by which the proceeds
actually received by such Holder from the sale of the Registrable Securities
subject to the Proceeding exceeds the amount of any damages that such Holder has
otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission.

               (e) The indemnity and contribution agreements contained in this
Section 5 are in addition to any liability that the Indemnifying Parties may
have to the Indemnified Parties. The remedies provided in this Section 5 are not
exclusive and shall not limit any rights or remedies which may otherwise be
available to an indemnified party at law or in equity.

                                       12

        6.     MISCELLANEOUS.

               (a) Remedies. In the event of a breach by the Company or by the
Investor or by a Holder of any of their obligations under this Agreement, the
Investor, each Holder or the Company, as the case may be, in addition to being
entitled to exercise all rights granted by law and under this Agreement,
including recovery of damages, will be entitled to specific performance of its
rights under this Agreement. The Company, the Investor and each Holder agree
that monetary damages would not provide adequate compensation for any losses
incurred by reason of a breach by it of any of the provisions of this Agreement
and hereby further agrees that, in the event of any action for specific
performance in respect of such breach, it shall waive the defense that a remedy
at law would be adequate.

               (b) No Piggyback on Registrations. Neither the Company nor any of
its security holders (other than the Holders in such capacity pursuant hereto)
may include securities of the Company in the Registration Statement other than
the Registrable Securities, and the Company shall not after the date hereof
enter into any agreement providing any such right to any of its security
holders.

               (c) Compliance. Each Holder covenants and agrees that it will
comply with the prospectus delivery requirements of the Securities Act as
applicable to it in connection with sales of Registrable Securities pursuant to
the Registration Statement, provided that the Company has delivered a Prospectus
to such Holder or a Prospectus is otherwise available via the EDGAR system.

               (d) Discontinued Disposition. Each Holder agrees by its
acquisition of such Registrable Securities that, upon receipt of a notice from
the Company of the occurrence of any event of the kind described in Section 3(c)
but subject to Section 3(l), such Holder will forthwith discontinue disposition
of such Registrable Securities under the Registration Statement until such
Holder's receipt of the copies of the supplemented Prospectus and/or amended
Registration Statement or until it is advised in writing (the "Advice") by the
Company that the use of the applicable Prospectus may be resumed, and, in either
case, has received copies of any additional or supplemental filings that are
incorporated or deemed to be incorporated by reference in such Prospectus or
Registration Statement. The Company may provide appropriate stop orders to
enforce the provisions of this paragraph.

               (e) Piggy-Back Registrations. If at any time during the
Effectiveness Period there is not an effective Registration Statement covering
all of the Registrable Securities and the Company shall determine to prepare and
file with the Commission a registration statement relating to an offering for
its own account or the account of others under the Securities Act of any of its
equity securities, other than on Form S-4 or Form S-8 (each as promulgated under
the Securities Act) or their then equivalents relating to equity securities to
be issued solely in connection with any acquisition of any entity or business or
equity securities issuable in connection with stock option or other employee

                                       13

benefit plans, then the Company shall send to each Holder written notice of such
determination and, if within fifteen days after receipt of such notice, any such
Holder shall so request in writing, the Company shall include in such
registration statement all or any part of such Registrable Securities such
holder requests to be registered, subject to customary underwriter cutbacks
applicable to all holders of registration rights.

               (f) Amendments and Waivers. The provisions of this Agreement,
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the same shall be in writing and signed by the Company
and the Holders of the then outstanding Registrable Securities (or, if there is
no Holder, the Note Holders). Notwithstanding the foregoing, a waiver or consent
to depart from the provisions hereof with respect to a matter that relates
exclusively to the rights of certain Holders and that does not directly or
indirectly affect the rights of other Holders may be given by Holders of at
least a majority of the Registrable Securities to which such waiver or consent
relates; provided, however, that the provisions of this sentence may not be
amended, modified, or supplemented except in accordance with the provisions of
the immediately preceding sentence.

               (g) Notices. Any and all notices or other communications or
deliveries required or permitted to be provided hereunder shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Section prior to 6:30 p.m. (New
York City time) on a Trading Day, (ii) the Trading Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Agreement later than 6:30 p.m. (New
York City time) on any date and earlier than 11:59 p.m. (New York City time) on
such date, (iii) the Trading Day following the date of mailing, if sent by
nationally recognized overnight courier service, or (iv) upon actual receipt by
the party to whom such notice is required to be given. The address for such
notices and communications shall be as follows:

         If to the Company:     HYSEQ, Inc.
                                670 Almanor Avenue,
                                Sunnyvale, California 94085
                                Facsimile No.:  (408) 524-8141
                                Attn: General Counsel

         With a copy to:        Latham & Watkins
                                135 Commonwealth Drive
                                Menlo Park, California 94025
                                Attn: Alan C. Mendelson
                                Facsimile No.:  (650) 463-2600

                                       14

         If to the Investor:    Affymetrix, Inc.
                                3380 Central Expressway
                                Santa Clara, California 95051
                                Attn: General Counsel
                                Facsimile No.:

         With a copy to:        Sullivan & Cromwell
                                1870 Embarcadero Road
                                Palo Alto, California 94303
                                Attention:  John L. Savva, Esq.
                                Facsimile No.:  (650) 461-5700

        If to any other Person who is then a registered Holder:

        To the address of such Holder as it appears in the stock transfer books
of the Company or such other address as may be designated in writing hereafter,
in the same manner, by such Person.

               (h) Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors and permitted assigns of each of
the parties and shall inure to the benefit of each Holder. The Company may not
assign its rights or obligations hereunder without the prior written consent of
each Holder of the then outstanding Registrable Securities (or, if there is no
Holder, the Note Holders). Each Note Holder and each Holder may assign their
respective rights hereunder in the manner and to the Persons as permitted under
the Promissory Notes.

               (i) Execution and Counterparts. This Agreement may be executed in
any number of counterparts, each of which when so executed shall be deemed to be
an original and all of which taken together shall constitute one and the same
Agreement. In the event that any signature is delivered by facsimile
transmission, such signature shall create a valid binding obligation of the
party executing (or on whose behalf such signature is executed) the same with
the same force and effect as if such facsimile signature were the original
thereof.

               (j) Governing Law. All questions concerning the construction,
validity, enforcement and interpretation of this Agreement shall be governed by
and construed and enforced in accordance with the internal laws of the State of
New York, without regard to the principles of conflicts of law thereof. Each
party agrees that all legal proceedings concerning the interpretations,
enforcement and defense of the transactions contemplated by this Agreement
(whether brought against a party hereto or its respective affiliates, directors,
officers, shareholders, employees or agents) shall be commenced in the state and
federal courts sitting in the City of New York, Borough of Manhattan (the "New
York Courts"). Each party hereto hereby irrevocably submits to the exclusive
jurisdiction of the New York Courts for the adjudication of any dispute
hereunder or in connection herewith or with any transaction contemplated hereby
or discussed herein

                                       15

(including with respect to the enforcement of this Agreement), and hereby
irrevocably waives, and agrees not to assert in any suit, action or proceeding,
any claim that it is not personally subject to the jurisdiction of any such
court, or such New York Courts are an improper or inconvenient venue for such
proceeding. Each party hereby irrevocably waives personal service of process and
consents to process being served in any such suit, action or proceeding by
mailing a copy thereof via registered or certified mail or overnight delivery
(with evidence of delivery) to such party at the address in effect for notices
to it under this Agreement and agrees that such service shall constitute good
and sufficient service of process and notice thereof. Nothing contained herein
shall be deemed to limit in any way any right to serve process in any manner
permitted by law. Each party hereto (including its affiliates, agents, officers,
directors and employees) hereby irrevocably waives, to the fullest extent
permitted by applicable law, any and all right to trial by jury in any legal
proceeding arising out of or relating to this Agreement or the transactions
contemplated hereby. If either party shall commence an action or proceeding to
enforce any provisions of this Agreement, then the prevailing party in such
action or proceeding shall be reimbursed by the other party for its attorneys
fees and other costs and expenses incurred with the investigation, preparation
and prosecution of such action or proceeding.

               (k) Cumulative Remedies. The remedies provided herein are
cumulative and not exclusive of any remedies provided by law.

               (l) Severability. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their reasonable efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction. It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

               (m) Headings. The headings in this Agreement are for convenience
of reference only and shall not limit or otherwise affect the meaning hereof.

               (n) Survival. The respective indemnities, agreements,
representations, warranties and other provisions set forth in this Agreement or
made pursuant hereto shall remain in full force and effect, regardless of any
investigation (or any statement as to the results thereof) made by or on behalf
of any Holder, any director, officer or partner of such Holder, any agent or
underwriter, any director, officer or partner of such agent or underwriter, or
any controlling person of any of the foregoing, and shall survive the transfer
and registration of the Registrable Securities of such Holder.

                                       16

               (o) Independent Nature of Holders' Obligations and Rights. The
obligations of each Holder hereunder is several and not joint with the
obligations of any other Holder hereunder, and no Holder shall be responsible in
any way for the performance of the obligations of any other Holder hereunder.
Nothing contained herein or in any other agreement or document delivered at any
closing, and no action taken by any Holder pursuant hereto or thereto, shall be
deemed to constitute the Holders as a partnership, an association, a joint
venture or any other kind of entity, or create a presumption that the Holders
are in any way acting in concert with respect to such obligations or the
transactions contemplated by this Agreement. Each Holder shall be entitled to
protect and enforce its rights, including without limitation the rights arising
out of this Agreement, and it shall not be necessary for any other Holder to be
joined as an additional party in any proceeding for such purpose.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                           SIGNATURE PAGES TO FOLLOW]

                                       17

        IN WITNESS WHEREOF, the parties have executed this Registration Rights
Agreement as of the date first written above.

                                       HYSEQ, INC.

                                       By /s/ PETER S. GARCIA
                                          -------------------------------------
                                          Name:  Peter S. Garcia
                                          Title: Sr. VP & CFO

                                       AFFYMETRIX, INC.

                                       By: /s/ BARBARA A. CAULFIELD
                                           -------------------------------------
                                           Name:  Barbara A. Caulfield
                                           Title: Exec. V.P. and General Counsel

                                                                         Annex A

                              PLAN OF DISTRIBUTION

        The common stock is being registered to permit public secondary trading
of these securities by the holders thereof from time to time after the date of
this prospectus. The Company will not receive any of the proceeds from the
offering of the common stock by selling securityholders.

        The selling securityholders, including their pledgees or donees, may
sell the common stock directly to purchasers or through underwriters,
broker-dealers or agents. If the common stock is sold through underwriters or
broker-dealers, the selling securityholder will be responsible for underwriting
discounts or commissions or agent's commissions. These discounts, concessions or
commissions as to any particular underwriter, broker-dealer or agent may be in
excess of those customary in the types of transactions involved.

        The common stock may be sold in one or more transactions at fixed
prices, at prevailing market prices at the time of sale, at varying prices
determined at the time of sale, or at negotiated prices. Such sales may be
effected in transactions, which may involve block transactions:

        -      on any national securities exchange or quotation service on which
               the common stock may be listed or quoted at the time of sale;

        -      in the over-the-counter market;

        -      in transactions otherwise than on such exchanges or services or
               in the over-the-counter market; or

        -      through the writing of options.

        In connection with sales of the common stock or otherwise, the selling
securityholders may enter into hedging transactions with broker-dealers, which
may in turn engage in short sales of the common stock in the course of hedging
the positions they assume. The selling securityholders may also sell short the
common stock and deliver the common stock to close out short positions, or loan
or pledge the common stock to broker-dealers that in turn may sell such
securities.

        The aggregate proceeds to the selling securityholders from the sale of
the common stock offered by them hereby will be the purchase price of the common
stock less discounts and commissions, if any. Each of the selling
securityholders reserves the right to accept and, together with their agents
from time to time, to reject, in whole or in part, any proposed purchase of
common stock to be made directly or through agents. The Company will not receive
any of the proceeds from this offering.

                                      A-1

        In order to comply with the securities laws of some states, if
applicable, the common stock may be sold in these jurisdictions only through
registered or licensed brokers or dealers. In addition, in some states the
common stock may not be sold unless it has been registered or qualified for sale
or an exemption from registration or qualification requirements is available and
is complied with.

        The selling securityholders and any underwriters, broker-dealers or
agents that participate in the sale of the common stock may be "underwriters"
within the meaning of Section 2(11) of the Securities Act. Any discounts,
commissions, concessions or profit they earn on any resale of the shares may be
underwriting discounts and commissions under the Securities Act. Selling
securityholders who are "underwriters" within the meaning of Section 2(11) of
the Securities Act will be subject to the prospectus delivery requirements of
the Securities Act. The selling securityholders have acknowledged that they
understand their obligations to comply with the provisions of the Exchange Act
and the rules thereunder relating to stock manipulation, particularly Regulation
M.

        In addition, any securities covered by this prospectus that qualify for
sale pursuant to Rule 144 under the Securities Act may be sold under Rule 144
rather than pursuant to this prospectus. A selling securityholder may not sell
any common stock described in this prospectus and may not transfer, devise or
gift these securities by other means not described in this prospectus.

        To the extent required, the specific common stock to be sold, the names
of the selling securityholders, the respective purchase prices and public
offering prices, the names of any agent, dealer or underwriter and any
applicable commissions or discounts with respect to a particular offer will be
set forth in an accompanying prospectus supplement or, if appropriate, a
post-effective amendment to the registration statement of which this prospectus
is a part.

        The Company entered into a registration rights agreement for the benefit
of the selling securityholders to register their common stock under applicable
federal and state securities laws under specific circumstances and at specific
times. The registration rights agreement provides for cross-indemnification of
the selling securityholders and the Company and their and the Company's
respective directors, officers and controlling persons against specific
liabilities in connection with the offer and sale of the common stock, including
liabilities under the Securities Act. The Company has agreed, among other
things, to bear all expenses (other than underwriting discounts and selling
commissions) in connection with the registration and sale of the common stock
covered by this prospectus.

                                      A-2

                                                                    EXHIBIT 4.10

                         PLEDGE AND SECURITY AGREEMENT

        PLEDGE AND SECURITY AGREEMENT, dated as of November 13, 2001, between
HYSEQ, INC., a Nevada corporation ("Pledgor"), and AFFYMETRIX, INC., a Delaware
corporation ("Affymetrix").

                                   WITNESSETH:

        WHEREAS, pursuant to the Preferred Stock Purchase Agreement, dated as of
the date hereof (the "Stock Purchase Agreement"), by and among Callida Genomics,
Inc., a Delaware corporation, Affymetrix and Pledgor, Affymetrix has agreed to
extend credit to the Pledgor pursuant to one or more Promissory Notes of the
Pledgor (collectively, the "Promissory Notes"); and

        WHEREAS, the purchase of the Promissory Notes by Affymetrix is
conditioned upon the execution and delivery by Pledgor of this Pledge and
Security Agreement to secure the due and punctual payment of the obligations of
Pledgor to Affymetrix described below.

        NOW THEREFORE, the parties hereto agree as follows:

        1. Pledgor's Grant of Security Interest in Collateral. For value
received and to induce Affymetrix to extend credit to Pledgor pursuant to the
Promissory Notes, Pledgor hereby grants to Affymetrix, as security for all
obligations and liabilities of Pledgor on account of principal, interest and all
other obligations and liabilities pursuant to the Promissory Notes (the
"Obligations"), a security interest in Pledgor's right, title and interest in
the property described in Schedule A hereto (collectively referred to as the
"Collateral").

        2. Delivery of Collateral. Any Pledged Securities (as defined in
Schedule A hereto) shall be evidenced by certificates, all of which shall be
delivered to and held in the possession of Affymetrix or a third party acting on
its behalf pursuant hereto. Upon delivery to Affymetrix, any Pledged Securities
in certificated form shall be in suitable form for transfer by delivery or shall
be accompanied by duly executed instruments of transfer or assignment in blank,
all in form and substance reasonably satisfactory to Affymetrix.

        3. Warranties, Covenants and Agreements of Pledgor. Pledgor warrants,
covenants and agrees that:

               (a) Pledgor has full corporate power and authority to enter into
this Pledge and Security Agreement and to grant to Affymetrix a security
interest therein as herein provided, all of which have been duly authorized by
all necessary corporate action; the execution and delivery and the performance
hereof are not in contravention of any charter or by-law provision or of any
indenture, agreement or undertaking to which Pledgor is a party or by which
Pledgor or its property are bound; this Pledge and Security Agreement
constitutes the valid and legally binding obligation of Pledgor enforceable in
accordance with its terms, subject, to bankruptcy, insolvency, reorganization
and other laws of general applicability relating to or

affecting creditors' rights and, as to enforcement, to general equity
principles; and Pledgor owns the Collateral free and clear of any lien, claim or
encumbrance.

               (b) (i) As long as any amount remains unpaid on any of the
Obligations or any additional borrowings may be made by Pledgor under any
agreements entered into in connection with the Obligations, except as expressly
permitted by any such agreements, (a) Pledgor will not enter into or execute any
security agreement or any financing statement covering the Collateral, other
than those security agreements and financing statements in favor of Affymetrix
hereunder, and further (b) Pledgor shall not file in any public office any
financing statement or statements (or any documents or papers filed as such)
covering the Collateral, other than financing statements in favor of Affymetrix
hereunder, unless in any case the prior written consent of Affymetrix shall have
been obtained.

                   (ii) Pledgor authorizes Affymetrix to file, in its
discretion, in jurisdictions where this authorization will be given effect, a
financing statement signed only by Affymetrix covering the Collateral, and
hereby appoints Affymetrix as Pledgor's attorney-in-fact to sign and file any
such financing statements covering the Collateral. At the request of Affymetrix,
Pledgor will join Affymetrix in executing such documents as Affymetrix may
reasonably determine, from time to time to be necessary or desirable under
provisions of any applicable Uniform Commercial Code in effect where the
Collateral is located or where Pledgor conducts business; without limiting the
generality of the foregoing, Pledgor agrees to join Affymetrix, at Affymetrix'
request, in executing one or more financing statements in form reasonably
satisfactory to Affymetrix, and Pledgor will pay the costs of filing or
recording the same, or of filing or recording this Pledge and Security
Agreement, in all public offices at any time and from time to time, whenever
filing or recording of any such financing statement or of this Pledge and
Security Agreement is deemed by Affymetrix to be necessary or desirable. In
connection with the foregoing, it is agreed and understood between the parties
hereto (and Affymetrix is hereby authorized to carry out and implement this
agreement and understanding and Pledgor hereby agrees to pay the costs thereof)
that Affymetrix may, at any time or times, file as a financing statement any
counterpart, copy or reproduction of this Pledge and Security Agreement.

        4. Rights of Affymetrix and Pledgor Related to Collateral. Affymetrix
may from time to time:

               (a) At any time, with respect to Pledged Securities (upon
execution of the documentation requested by Pledgor in accordance with Section
4(d)(ii) hereof) and following the occurrence and during the continuance of an
Event of Default, in the case of all other Collateral, transfer any of the
Collateral into the name of Affymetrix or its nominee.

               (b) Following the occurrence of an Event of Default, notify
parties obligated on any of the Collateral to make payment to Affymetrix of any
amounts due or to become due thereunder.

               (c) Following the occurrence of an Event of Default, enforce
collection of any of the Collateral by suit or otherwise; surrender, release or
exchange all or any part thereof,

                                       2

or compromise or extend or renew for any period (whether or not longer than the
original period) any obligation of any nature of any party with respect thereto
in a commercially reasonable manner; and exercise all other rights of Pledgor in
any of the Collateral, except as hereinafter provided with respect to income
from or interest on the Collateral.

               (d) Following the occurrence and during the continuance of an
Event of Default, take possession or control of any proceeds of the Collateral.

               Until the occurrence of an Event of Default Pledgor shall have
the right to receive all income from or interest on the Collateral, and if
Affymetrix receives any such income or interest prior to the occurrence of an
Event of Default, Affymetrix shall pay the same promptly to Pledgor, except that
in the case of securities or other property distributed by way of a dividend or
otherwise with respect to the Collateral, such securities or other property
shall be promptly delivered to Affymetrix in the manner described in Section 2
hereof to be held as Pledged Securities or other Collateral hereunder. Upon the
occurrence and during the continuance of an Event of Default, if Pledgor
receives any income or interest on the Collateral, the same shall be held by
Pledgor in trust for Affymetrix in the same medium in which received, shall not
be commingled with any assets of Pledgor and shall be delivered to Affymetrix in
the form received, properly endorsed to permit collection, not later than the
next business day following the day of its receipt. Affymetrix shall apply the
net cash received from such income or interest to payment of any of the
Obligations, provided that Affymetrix shall account for and pay over to Pledgor
any such income or interest remaining after payment in full of the Obligations
then outstanding.

               So long as no Event of Default shall have occurred and be
continuing:

                  (i) The Pledgor shall be entitled to exercise any and all
voting and other consensual rights pertaining to the Collateral or any part
thereof for any purpose not inconsistent with the terms of this Pledge and
Security Agreement or the Promissory Notes; provided, however, that Pledgor
shall not take any action which materially and adversely affects the value of
the Collateral or Pledgor's ability to repay the Promissory Notes.

                  (ii) Affymetrix shall execute and deliver (or cause to be
executed and delivered) to Pledgor all such proxies and other instruments as
Pledgor may reasonably request for the purpose of enabling Pledgor to exercise
the voting and other rights which it is entitled to exercise pursuant to
paragraph (i).

               Affymetrix shall be under no obligation to collect, attempt to
collect, protect or enforce the Collateral or any security therefor, which
Pledgor agrees and undertakes to do at Pledgor's expense, but Affymetrix may do
so in its reasonable discretion at any time after the occurrence and during the
continuance of an Event of Default and at such time Affymetrix shall have the
right to take any steps not inconsistent with the provisions of the Uniform
Commercial Code and this Pledge and Security Agreement, by judicial process or
otherwise, it may deem proper to effect the collection of all or any portion of
the Collateral or to protect or to enforce the Collateral or any security
therefor. All reasonable expenses (including, without limitation, reasonable
attorneys' fees and expenses) incurred or paid by Affymetrix in connection

                                       3

with or incident to any such collection or such attempt to collect the
Collateral or such actions to protect or enforce the Collateral or any security
therefor shall be borne by Pledgor or reimbursed by Pledgor to Affymetrix upon
written request therefor. The proceeds received by Affymetrix as a result of any
such actions in collecting or enforcing or protecting the Collateral shall be
held by Affymetrix without liability for interest thereon and shall be applied
by Affymetrix as provided by Section 9.

               In the event Affymetrix shall reasonably pay any taxes,
assessments, interests, costs, penalties or expenses incident to or in
connection with the collection of the Collateral or protection or enforcement of
the Collateral, Pledgor, promptly following written request of Affymetrix, shall
pay to Affymetrix the full amount thereof and so long as Affymetrix shall be
entitled to any such payment, this Pledge and Security Agreement shall operate
as security therefor as fully and to the same extent as it operates as security
for payment of the other Obligations secured hereunder, and for the enforcement
of such repayment Affymetrix shall have every right and remedy provided for
enforcement of payment of the Obligations.

        5. Further Assurances; Affymetrix as Agent. Pledgor agrees to take such
actions and to execute such stock or bond powers and such other or different
writings as Affymetrix may reasonably request (and in the event it shall fail to
do so, or if there shall occurred and be continuing an Event of Default,
irrevocably authorizes Affymetrix to execute such writings as Pledgor's agent
and attorney-in-fact) further to perfect, confirm and assure Affymetrix's
security interest in the Collateral pursuant hereto and to assist Affymetrix'
realization thereon including, without limitation, the right to receive,
indorse, and collect all instruments made payable to Pledgor representing any
dividend, interest payment or other distribution in respect of the Collateral or
any part thereof to the extent provided herein.

        6. Events of Default. The occurrence of any "Event of Default" pursuant
to Section 5 of the Promissory Notes constitutes an event of default under this
Pledge and Security Agreement (an "Event of Default").

        7. Rights and Remedies of Affymetrix Upon Default. If an Event of
Default shall have occurred and be continuing:

               (a) Affymetrix shall have and may exercise with reference to the
Collateral and the Obligations any or all of the rights and remedies of a
secured party under the Uniform Commercial Code in effect in the State of
California, and as otherwise granted herein or under any other applicable law or
under any other agreement now or hereafter in effect executed by Pledgor in
favor of Affymetrix, including, without limitation, the right and power to sell,
at public or private sale or sales, or otherwise dispose of, or otherwise
utilize the Collateral and any part or parts thereof in any manner authorized or
permitted under said Uniform Commercial Code after default by a debtor, and to
apply the proceeds thereof toward payment of any reasonable costs and expenses
and reasonable attorneys' fees and expenses thereby incurred by Affymetrix and
toward payment of the Obligations as provided in Section 9. Specifically and
without limiting the foregoing, Affymetrix shall have the right to take
possession of all or any part of the Collateral, and for such purpose may enter
upon any premises upon which any of the Collateral or any security therefor are
situated and remove the same therefrom without any

                                       4

liability for trespass or damages thereby occasioned, if it proceeds without
breach of the peace. To the extent permitted by law, Pledgor expressly waives
any notice of sale or other disposition of the Collateral and all other rights
or remedies of Pledgor or formalities prescribed by law relative to sale or
disposition of the Collateral or exercise of any other right or remedy of
Affymetrix existing after default hereunder; and to the extent any such notice
is required and cannot be waived, Pledgor agrees that if such notice is given in
the manner provided in Section 13 hereof at least ten (10) calendar days before
the time of the sale or disposition, such notice shall be deemed reasonable and
shall fully satisfy any requirement for giving of said notice. Affymetrix shall
not be obligated to make any sale of Collateral regardless of notice of sale
having been given. Affymetrix may adjourn any public or private sale.

               (b) Upon notice by Affymetrix to Pledgor, Affymetrix or its
nominee or nominees shall have the sole and exclusive right to exercise all
voting and consensual powers pertaining to the Collateral or any part thereof
and may exercise such powers in such manner as Affymetrix may elect.

               (c) All dividends, payments of interest and other distributions
of every character made upon or in respect of the Collateral or any part thereof
shall be deemed to be Collateral and shall be paid directly to and shall be held
by Affymetrix as additional Collateral pledged under and subject to this Pledge
and Security Agreement.

               (d) All rights to marshalling of assets of Pledgor, including any
such right with respects to the Collateral, are hereby waived by Pledgor.

               (e) All recitals in any instrument of assignment or any other
instrument executed by Affymetrix incident to sale, lease, transfer, assignment
or other disposition, lease or utilization of the Collateral or any part thereof
hereunder shall be full proof of the matters stated therein and no other proof
shall be requisite to establish full legal propriety of the sale or other action
taken by Affymetrix or of any fact, condition or thing incident thereto and all
prerequisites of such sale or other action or of any fact, condition or thing
incident thereto shall be presumed conclusively to have been performed or to
have occurred.

        8. Special Provisions for Pledged Securities.

               (a) Pledgor hereby acknowledges that the sale by Affymetrix of
any Pledged Securities pursuant to the terms hereof in compliance with the
Securities Act of 1933 (as now in effect or as hereafter amended, or any similar
statute hereafter adopted with similar purpose or effect, the "Securities Act"),
as well as applicable Blue Sky or other state securities laws may require strict
limitations as to the manner in which Affymetrix or any subsequent transferee of
Pledged Securities may dispose of such securities. Pledgor understands that in
order to protect Affymetrix's interest it may be necessary to sell the Pledged
Securities at a price less than the maximum price attainable if a sale were
delayed or were made in another manner, such as a public offering requested
under the Securities Act. Pledgor has no objection to sale in such a manner and
agrees that Affymetrix shall have no obligation to obtain the maximum possible
price for the Pledged Securities.

               (b) Pledgor agrees that, upon the occurrence and during the
continuance of an Event of Default, if for any reason Affymetrix desires to sell
any Pledged Securities at a

                                       5

public or private sale and in connection with such sale, in the opinion of
outside counsel from a nationally recognized U.S. law firm, no exemption from
the registration provisions of the Securities Act is available, Pledgor will,
upon the written request of Affymetrix and receipt of a written copy of such
legal opinion, at Pledgor's own expense:

                  (i) use its best efforts to cause such Pledged Securities to
be registered under the provisions of the Securities Act, and to cause the
registration statement relating thereto to become effective and to remain
effective for such period as prospectuses are required by law to be furnished,
and to make all amendments and supplements thereto and to the related prospectus
which, in the opinion of Affymetrix, are necessary or advisable, all in
conformity with the requirements of the Securities Act and the rules and
regulations of the Securities and Exchange Commission applicable thereto;

                  (ii) indemnify, defend and hold harmless Affymetrix and any
underwriter from and against all losses, liability, reasonable expenses,
reasonable costs, reasonable fees and reasonable disbursements of counsel
(including, without limitation, a reasonable estimate of the cost to Affymetrix
of legal counsel), and claims (including the costs of investigation) which they
may incur insofar as such loss, liability, expense or claim arises out of or is
based upon any alleged untrue statement of a material fact contained in any
prospectus (or any amendment or supplement thereto) or in any notification or
offering circular, or arises out of or is based upon any alleged omission to
state a material fact required to be stated therein or necessary to make the
statements in any thereof not misleading, except insofar as the same may have
been caused by any untrue statement or omission based upon information furnished
in writing to the Pledgor or the issuer of such Pledged Securities by Affymetrix
expressly for use therein;

                  (iii) use its best efforts to qualify such Pledged Securities
under the state securities or "Blue Sky" laws and to obtain all necessary
governmental approvals for the sale of such Pledged Securities, as requested by
Affymetrix;

                  (iv) use its best efforts to cause each such issuer of such
Pledged Securities to make available to its security holders, as soon as
practicable, an earning statement which will satisfy the provisions of Section
11(a) of the Securities Act;

                  (v) bear all costs and expenses of carrying out its
obligations under this Section 8; and

                  (vi) use its best efforts to do or cause to be done all such
other acts and things as may be necessary to make such sale of Pledged
Securities or any part thereof valid and binding and in compliance with all
applicable law.

Nothing in this subsection (b) shall in any way alter the rights of Affymetrix
under subsection (a) above. Pledgor acknowledges that there is no adequate
remedy at law for failure by it to comply with the provisions of this Section
and that such failure would not be adequately compensable in damages, and
therefore agrees that its agreements contained in this Section 8 may be
specifically enforced.

                                       6

        9. Application of Proceeds by Affymetrix. In the event Affymetrix sells
or otherwise disposes of or realizes on the Collateral in the course of
exercising the remedies provided for herein, any amounts held, realized or
received by Affymetrix pursuant to the provisions hereof, including the proceeds
of the sale of any of the Collateral or any part thereof, shall be applied by
Affymetrix first toward the payment of any reasonable costs and expenses
incurred by Affymetrix in enforcing this Pledge and Security Agreement, in
realizing on or protecting any Collateral and in enforcing or collecting any
Obligations or any guaranty thereof, including, without limitation, the actual
reasonable attorney's fees and expenses incurred by Affymetrix (all of which
costs and expenses are secured by the Collateral), all of which costs and
expenses Pledgor agrees to pay, and then between interest and principal as
Affymetrix may elect. Any amounts and any Collateral remaining after such
application and after payment to Affymetrix of all of the Obligations in full
shall be paid or delivered to Pledgor, its successor or assigns, or as a court
of competent jurisdiction may direct.

        To the fullest extent permitted by applicable law, Affymetrix shall be
deemed to have exercised reasonable care in the custody and preservation of the
Collateral in its possession if the Collateral is accorded treatment
substantially equal to that which Affymetrix accords its own property, it being
understood that Affymetrix shall not have any responsibility for (i)
ascertaining or taking action with respect to calls, conversions, exchanges,
maturities, tenders or other matters relative to any Collateral, whether or not
Affymetrix has or is deemed to have knowledge of such matters, or (ii) taking
any necessary steps to preserve rights against any parties with respect to any
Collateral.

        10. Pledgor Fully Liable. This Pledge and Security Agreement shall not
be construed as relieving Pledgor from full liability on the Obligations and any
and all future and other indebtedness secured hereby and for any deficiency
thereon.

        11. Termination. This Pledge and Security Agreement and the security
interest created hereunder shall terminate when all the Obligations have been
indefeasibly paid in full and when Affymetrix has no further obligation to
extend credit under the Stock Purchase Agreement, the Promissory Notes or any
other written agreement relating to the Obligations, at which time Affymetrix
shall execute and deliver to Pledgor all documents which Pledgor shall
reasonably request to evidence termination of such security interest and shall
return physical possession of any Collateral then held by Affymetrix to Pledgor;
provided, however, that all indemnities of the Pledgor contained in this Pledge
and Security Agreement shall survive, and remain in full force and effect
regardless of the termination of the security interest or this Pledge and
Security Agreement.

        12. Additional Information. Pledgor agrees to furnish Affymetrix from
time to time with such additional information and copies of such documents
relating to this Pledge and Security Agreement, the Collateral and the
Obligations as Affymetrix may reasonably request.

        13. Notices. Any notices and other communications required or permitted
under this Pledge and Security Agreement shall be effective if in writing and
delivered personally or

                                       7

sent by telecopier, Federal Express or registered or certified mail, postage
prepaid, addressed as follows:

If to Affymetrix, to:         Affymetrix, Inc.
                              3380 Central Expressway
                              Santa Clara, California  95051
                              Telephone:  (408) 731-5000
                              Telecopier:  (408) 731-5394
                              Attention:  General Counsel

with a copy to(which shall    Sullivan & Cromwell
not constitute notice):       1870 Embarcadero Road
                              Palo Alto, California  94303
                              Telephone:  (650) 461-5600
                              Telecopier:  (650) 461-5700
                              Attention:  John L. Savva, Esq.

If to the Pledgor, to:        Hyseq, Inc.
                              670 Almanor Avenue
                              Sunnyvale, California  94085
                              Telephone:  (408) 524-8100
                              Telecopier:  (408) 524-8141
                              Attention:  General Counsel

with a copy to (which shall   Latham & Watkins
not constitute notice):       135 Commonwealth Drive
                              Menlo Park, California  94025
                              Telephone:    (650) 328-4600
                              Telecopier:   (650) 463-1600
                              Attention:  Alan C. Mendelson, Esq.

        Unless otherwise specified herein, such notices or other communications
shall be deemed effective (a) on the date delivered, if delivered personally,
(b) two business days after being sent, if sent by Federal Express or other
commercial overnight delivery service, (c) one business day after being sent, if
sent by telecopier with confirmation of good transmission and receipt, and (d)
three business days after being sent, if sent by registered or certified mail.
Each of the parties hereto shall be entitled to specify another address by
giving notice as aforesaid to each of the other parties hereto.

        14. Indemnity and Expenses. Pledgor agrees to indemnify Affymetrix from
and against any and all claims, losses and liabilities growing out of or
resulting from this Pledge and Security Agreement (including, without
limitation, enforcement of the Promissory Notes or this Pledge and Security
Agreement and all claims and demands of all persons at any time claiming the
Collateral or any interest therein), except claims, losses or liabilities
resulting from Affymetrix's gross negligence or willful misconduct. Pledgor
agrees to promptly pay upon written request all reasonable out-of-pocket
expenses (including the reasonable fees and

                                       8

expenses of Affymetrix's counsel, experts and agents) in any way relating to the
enforcement or protection of the rights of Affymetrix hereunder and further
agrees that the Collateral secures such payment.

        15. No Waiver; Cumulative Rights. No failure on the part of Affymetrix
to exercise, and no delay in exercising, any right, remedy or power hereunder
shall operate as a waiver thereof, nor shall any single or partial exercise by
Affymetrix of any right, remedy or power hereunder preclude any other or future
exercise of any other right, remedy or power. Each and every right, remedy and
power hereby granted to Affymetrix or allowed it by law or other agreement shall
be cumulative and not exclusive the one of any other, and may be exercised by
Affymetrix from time to time.

        16. Submission to Jurisdiction; Waiver of Jury Trial. (a) THIS PLEDGE
AND SECURITY AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER
SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE
STATE OF CALIFORNIA. TO INDUCE AFFYMETRIX TO ENTER INTO THIS PLEDGE AND SECURITY
AGREEMENT, PLEDGOR HEREBY IRREVOCABLY AGREES THAT, SUBJECT TO AFFYMETRIX' SOLE
AND ABSOLUTE ELECTION, ALL ACTIONS OR PROCEEDINGS WHICH IN ANY MANNER ARISE OUT
OF OR IN CONNECTION WITH OR ARE IN ANY WAY RELATED TO THIS PLEDGE AND SECURITY
AGREEMENT SHALL BE LITIGATED IN COURTS HAVING SITUS WITHIN THE COUNTY OF SANTA
CLARA, STATE OF CALIFORNIA. PLEDGOR HEREBY CONSENTS TO THE JURISDICTION OF ANY
STATE OR FEDERAL COURT LOCATED WITHIN THE COUNTY OF SANTA CLARA, STATE OF
CALIFORNIA. PLEDGOR HEREBY WAIVES ANY RIGHT IT MAY HAVE TO TRANSFER OR CHANGE
THE VENUE OF ANY LITIGATION BETWEEN PLEDGOR AND AFFYMETRIX IN ACCORDANCE WITH
THIS PARAGRAPH.

        (b) EACH OF PLEDGOR AND AFFYMETRIX HEREBY KNOWINGLY, VOLUNTARILY AND
INTENTIONALLY WAIVES ANY RIGHT TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING
WHICH IN ANY MANNER ARISES OUT OF OR IN CONNECTION WITH OR IS IN ANY WAY RELATED
TO THIS PLEDGE AND SECURITY AGREEMENT OR ANY OF THE TRANSACTIONS CONTEMPLATED
HEREIN.

        (c) THE PROVISIONS OF THIS SECTION 16 ARE A MATERIAL INDUCEMENT FOR
AFFYMETRIX ENTERING INTO THE PROMISSORY NOTES AND THE TRANSACTIONS CONTEMPLATED
HEREIN. PLEDGOR HEREBY ACKNOWLEDGES THAT IT HAS REVIEWED THE PROVISIONS OF THIS
SECTION 16 WITH ITS COUNSEL.

        17. Execution in Counterparts. This Pledge and Security Agreement may be
executed in any number of counterparts, each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

                                       9

               IN WITNESS WHEREOF, the parties have caused this Pledge and
Security Agreement to be duly executed as of the date first above written.

                                       HYSEQ, INC.

                                       By /s/ PETER S. GARCIA
                                          -------------------------------------
                                          Name:  Peter S. Garcia
                                          Title: Sr. VP & CFO

                                       AFFYMETRIX, INC.

                                       By: /s/ BARBARA A. CAULFIELD
                                           -------------------------------------
                                           Name:  Barbara A. Caulfield
                                           Title: Exec. V.P. and General Counsel

                                       10

                                      SCHEDULE A

                                      COLLATERAL

        Pledged Securities. All outstanding shares of capital stock (the
"Pledged Stock") of Callida Genomics, Inc., a Delaware corporation ("CGI"), held
by Pledgor or any affiliate or agent of Pledgor, including, without limitation,
3,600,000 shares of Series A Preferred Stock, par value $0.001 per share, of CGI
held by Pledgor on the date hereof and any shares of capital stock of CGI issued
to Pledgor or any affiliate or agent of Pledgor in the future pursuant to the
Stock Purchase Agreement or otherwise; and

        Any securities (together with the Pledged Stock, the "Pledged
Securities"), cash or property issued in exchange for the Pledged Securities in
a merger, consolidation, reorganization, recapitalization or otherwise, or as a
dividend or distribution on the Pledged Securities; and

        All additions to and all replacements of and substitutions for any
property described on this Schedule A; and

        All policies of insurance covering or relating in any manner to any of
the property described on this Schedule A, all of which policies are hereby
assigned to Affymetrix as security for the Obligations; and

        All proceeds (including insurance proceeds) from the sale, destruction,
loss, or other disposition of any nature of any of the above; and

        All products and produce of any of the above.

                                       11

                                                                   EXHIBIT 10.16

                      COLLABORATION AND LICENSE AGREEMENT

        THIS COLLABORATION AND LICENSE AGREEMENT (the "Agreement") is made as of
June 29, 2001 (the "Effective Date") by and between AURORA BIOSCIENCES
CORPORATION, a Delaware corporation ("Aurora"), and HYSEQ, INC., a Nevada
corporation ("Hyseq").

                                    RECITALS

        WHEREAS, Aurora and Hyseq wish to enter into a collaboration to (i)
screen proteins within Hyseq's [***] protein [***] collection using Aurora's
proprietary CellSensor(TM) panel (the "CellSensor Panel") to identify OSPs of
interest as potential therapeutics, (ii) generate information that enhances the
utility of Hyseq's cDNA collection and database, and (iii) develop assays for
and screen, potentially novel drug targets selected from Hyseq's cDNA collection
with small molecule compounds of interest; and

        WHEREAS, Aurora wishes to grant to Hyseq, and Hyseq wishes to obtain
from Aurora, a non-exclusive license under the Aurora Patents and Stanford
Patents (both defined below) on the terms and subject to the conditions set
forth herein.

        NOW, THEREFORE, in consideration of the foregoing recitals and the
mutual covenants and agreements contained herein, the parties hereby agree as
follows:

                                    AGREEMENT

                                    ARTICLE 1
                                   DEFINITIONS

        1.1 "ACTIVE CLONING POOL" means up to [***] cDNA sequences selected by
[***] from the Hyseq Gene Sequences which are being [***] at any given time
under the Target Program.

        1.2 "AFFILIATE" means an individual, trust, business trust, joint
venture, partnership, corporation, association or any other entity which owns,
is owned by or is under common ownership with, a party. For the purposes of this
definition only, the term "owns" (including, with correlative meanings, the
terms "owned by" and "under common ownership with") as used with respect to any
party, will mean the possession (directly or indirectly) of more than 50% of the
outstanding voting securities of a corporation or comparable equity interest in
any other type of entity.

        1.3 "AURORA ASSAY" means any assay that is developed and validated by
Aurora under the Collaboration and that incorporates [***] or more Hyseq
Targets.

        1.4 "AURORA COMPOUND LIBRARY" means the collection of compounds owned
by, or licensed to Aurora during the Term, and [***] thereof.

        1.5 "AURORA MUTANT GFP" means any mutant [***] fluorescent protein, or
any polynucleotide encoding any mutant [***] fluorescent protein, which is
covered by the Aurora

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

Patents or the Stanford Patents, and which is (i) supplied by Aurora, (ii)
supplied by a bona fide licensee of Aurora licensed under the Aurora Patents or
the Stanford Patents to sell Aurora Mutant GFP, or (iii) internally developed by
Hyseq.

        1.6 "AURORA PATENTS" means the patents and patent applications listed on
Exhibit A, which is attached hereto and incorporated herein by reference, and
any continuations, divisions, reissues, extensions or continuations-in-part with
respect thereto, and all United States patents issuing therefrom.

        1.7 "AURORA PRODUCT" means (i) any small molecule compound, or analog or
derivative thereof, which is identified, developed or discovered by Aurora as
active against a Hyseq Target using an Aurora Assay, and pursued and developed
for that Hyseq Target, or (ii) any small molecule compound, or analog or
derivative thereof, that is determined [***] under the Collaboration to affect
the activity of (1) an [***], or (2) an [***].

        1.8 "AURORA TECHNOLOGY" means any of the polynucleotides listed on
Exhibit C, which is attached hereto and incorporated herein by reference, and
Aurora's proprietary technical manual for use of the same.

        1.9 "BLA" means a Biologics License Application filed pursuant to the
requirements of the FDA, or the equivalent application in any other country or
jurisdiction.

        1.10 "COLLABORATION" means the activities of the parties carried out in
performance of, and the relationship between the parties established by, this
Agreement.

        1.11 "COLLABORATION PERIOD" means the period beginning on the Effective
Date and ending upon the later of: (i) two years thereafter, or (ii) [***]
following (1) receipt by Aurora of the final batch of OSPs for screening, (2)
Hyseq's selection of the final OSP for creation of a Data Package, or (3)
Aurora's receipt of the final Hyseq Target, or (iii) such other period
established by mutual written agreement of the parties.

        1.12 "COMMERCIALLY REASONABLE AND DILIGENT EFFORTS" means, unless the
parties agree otherwise in writing, [***].

        1.13 "CONFIDENTIAL INFORMATION" means any proprietary, confidential or
trade secret information of a party disclosed during the Term and identified as
Confidential, including, without limitation, the terms of this Agreement and
information relating to any use, process, method, compound, research project,
work in process, future development, scientific, engineering, manufacturing,
marketing, business plan, financial or personnel matter relating to the
disclosing party, its present or future products, sales, suppliers, customers,
employees, investors or business, whether in oral, written, graphic or
electronic form. The Hyseq Gene Sequences, the Hyseq Targets and Hyseq's
proprietary OSP collection will be considered Confidential Information of Hyseq
under this Agreement, regardless of whether identified as Confidential.
Notwithstanding the foregoing, Confidential Information will not include any
information which the receiving party can prove by contemporaneous evidence:

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

               (a) is now, or hereafter becomes, through no act or failure to
act on the part of the receiving party, generally known or available to Third
Parties;

               (b) is known by the receiving party at the time of receiving such
information, as evidenced by its records;

               (c) is hereafter furnished to the receiving party by a Third
Party, as a matter of right and without restriction on disclosure;

               (d) is independently developed by the receiving party, as
evidenced by its records, without knowledge of, and without the aid, application
or use of, the disclosing party's Confidential Information; or

               (e) is the subject of a written permission to disclose provided
by the disclosing party.

        1.14 "CONTROL" means possession of the ability of either party to grant
a license or sublicense to the other party as provided for herein without
violating the terms of any agreement or other arrangement with any Third Party.

        1.15 "DATA PACKAGE" means all data and results obtained by Aurora from
screening an OSP, including, without limitation, information described on
Exhibit D, which is attached hereto and incorporated herein by reference,
relating to [***].

        1.16 "EXCLUDED FIELD" means any activities outside the Field, including,
but not limited to: (i) providing services to Third Parties; (ii) the use of
[***]; (iii) transfer to a Third Party of any product, process, method,
composition of matter and/or biological material covered under the Aurora
Patents or the Stanford Patents or incorporating the Aurora Technology; (iv) any
non-pharmaceutical research; (v) [***] of chemicals (e.g. proteins or small
molecules); (vi) [***] of chemicals (e.g. proteins or small molecules); (vii)
diagnostics; (viii) use of [***]; (ix) use in or with [***] (including [***]
cells); or (x) detection of [***]. In addition, the Stanford Patents may not be
practiced in the field of [***].

        1.17 "EXCLUSIVITY PERIOD" means, for each Hyseq Target, the period
beginning on receipt by Aurora of such Hyseq Target, and ending [***]
thereafter, unless extended in accordance with Section 5.4 (a).

        1.18 "FDA" means the United States Food and Drug Administration.

        1.19 "FIELD" means internal use of Aurora Mutant GFP (i) to perform
[***], and (ii) to create [***] for basic research (e.g., [***]).

        1.20 "FIRST COMMERCIAL SALE" means the first sale for use or consumption
of a Product. Sale to a sublicensee will not constitute a First Commercial Sale
unless the sublicensee is the end user of such Product.

        1.21 "GFP MATERIALS" means Materials that contain Aurora Mutant GFP.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

        1.22 "HYSEQ GENE SEQUENCES" mean [***] gene sequences from Hyseq's cDNA
database, which are identified using criteria determined jointly by Aurora and
Hyseq scientists, and which are provided by Hyseq to Aurora under the
Collaboration. [***].

        1.23 "HYSEQ PATENTS" means all patents or patent applications, and any
continuations, continuations-in-part, divisions, reissues, substitutes, renewals
or extensions thereof, and all patents issuing therefrom, which claim any Hyseq
Targets, OSPs or OSP Receptors and which are under the Control of Hyseq during
the Term.

        1.24 "HYSEQ PRODUCT" means (i) any of the OSPs provided to Aurora by
Hyseq and screened under the Collaboration by Aurora and active in Aurora's
CellSensor Panel, as disclosed to Hyseq hereunder, or any mutation, fragment,
analog or derivative of such OSPs, (ii) any other product identified, discovered
or developed [***] under the OSP Program, such as [***], or (iii) any biological
product identified, discovered or developed [***] under the Target Program, such
as [***].

        1.25 "HYSEQ TARGET" means an [***] protein or cloned and sequence
verified full-length cDNA, which is selected by [***] from the Active Cloning
Pool and provided to Aurora by Hyseq.

        1.26 "IMPROVEMENTS" means [***].

        1.27 "JOINT INVENTIONS" has the meaning set forth in Article 7.

        1.28 "JOINT RESEARCH AND DEVELOPMENT COMMITTEE" or "JRDC" means the
committee established pursuant to Section 2.1.

        1.29 "LICENSE PERIOD" means the period beginning on the Effective Date
and ending [***] thereafter, unless extended by mutual written agreement.

        1.30 "MATERIALS" means any reagents, promoters, enhancers, vectors,
plasmids, genes, polynucleotides, cells, proteins and fragments thereof,
peptides, antigens, antibodies, antagonists, agonists, inhibitors and chemicals.

        1.31 "NDA" means a New Drug Application filed pursuant to the
requirements of the FDA, or the equivalent application in any other country or
jurisdiction.

        1.32 "NET SALES" means, with respect to any Product, the gross amount
invoiced by either party or any of its sublicensees on sales or other transfers
of such Product, less [***]. If either party distributes a Product to any of its
sublicensees for end use by such sublicensee, then such distribution will be
considered a sale at list price normally charged to an independent Third Party
and the other party will be entitled to collect a royalty on such sale in
accordance with Section 5.1(g) or Section 5.2(f), as applicable, so long as no
royalty is applied to future resales. Such amounts will be determined from the
books and records of the party distributing such Product and/or its
sublicensees, such books and records being maintained in accordance with GAAP.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

        1.33 "OSPS" means any gene sequence, including [***] to encode a protein
or peptide [***] to be expressed in either membrane-bound or secreted form that
is provided to Aurora by Hyseq for screening and evaluation under the
Collaboration.

        1.34 "OSP PROGRAM" has the meaning set forth in Section 3.2.

        1.35 "OSP RECEPTORS" mean a receptor of an OSP, identified under the
Collaboration.

        1.36 "PHASE I" means that portion of the clinical development program
which generally provides for the first introduction into humans of a Product
with the primary purpose of determining safety, metabolism, pharmacokinetic
properties and clinical pharmacology of the Product, as more specifically
defined by the rules and regulations of the FDA and corresponding rules and
regulations in other countries or jurisdictions.

        1.37 "PHASE III" means that portion of the clinical development program
which provides for the continued trials of a Product on sufficient numbers of
patients to establish the safety and efficacy of a Product for the desired
claims and indications, as more specifically defined by the rules and
regulations of the FDA and corresponding rules and regulations in other
countries or jurisdictions.

        1.38 "PRIMARY SCREENING" means use of an Aurora Assay to determine
potential therapeutic or pharmaceutical activity or efficacy of compounds in the
Aurora Compound Library.

        1.39 "PRODUCT" means an Aurora Product or a Hyseq Product, as
applicable.

        1.40 "RESEARCH PROGRAMS" means the OSP Program and the Target Program.

        1.41 "ROYALTY TERM" means, for the convenience of the parties, the
period of time commencing on the First Commercial Sale of a Product in any
country and ending upon the later of [***] the expiration of the last to expire
patent covering such Product in such country.

        1.42 "SECONDARY SCREENING" means the (i) [***] of compounds identified
as [***] in Primary Screening and/or (ii) the screening of compounds identified
as active in Primary Screening against a [***] Hyseq Target to determine [***].

        1.43 "STANFORD AGREEMENT" means that certain exclusive license agreement
between Aurora and The Board of Trustees of the Leland Stanford Junior
University ("Stanford") dated April 25, 1998.

        1.44 "STANFORD LICENSED PRODUCT" means any product or process, or part
thereof, in the Field, or whose manufacture, use or sale is covered by a valid
claim of an issued, unexpired Stanford Patent and will be presumed to be valid
unless and until it has been held to be invalid by a final judgment of a court
of competent jurisdiction from which no appeal can be or has been taken.

        1.45 "STANFORD PATENTS" means the U.S. patents and applications listed
on Exhibit B, attached hereto and incorporated herein by reference, and
continuations, divisions, reissues,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

extensions or continuations-in-part with respect thereto, and all United States
patents issuing therefrom.

        1.46 "TARGET PROGRAM" has the meaning set forth in Section 3.3.

        1.47 "TERRITORY" means [***].

        1.48 "TERM" has the meaning set forth in Section 10.1.

        1.49 "THIRD PARTY" means any entity other than Aurora or Hyseq.

                                    ARTICLE 2
                    JOINT RESEARCH AND DEVELOPMENT COMMITTEE

        2.1 FORMATION. Within 30 days after the Effective Date, the parties will
establish a joint research and development committee (the "JRDC"). The JRDC will
consist of two senior scientists and one business representative designated by
Aurora and two senior scientists and one business representative designated by
Hyseq. Either party may appoint substitute or replacement members of the JRDC to
serve as their representatives upon notice to the other party. The JRDC will
have the responsibility and authority to (a) manage the Research Programs, (b)
assign tasks and responsibilities under the Research Programs consistent with
the terms of this Agreement to Aurora and Hyseq, respectively, and (c) review
and modify the Research Programs, as it deems appropriate to achieve the
parties' objectives under this Agreement.

        2.2 MEETINGS. The JRDC will meet at least once per quarter at locations
and times to be determined by the JRDC, with the intent of meeting at
alternating locations in San Diego, California and Sunnyvale, California or by
tele- or video-conference. Each party will bear all travel and related costs for
its representatives. On an alternating basis, a party will promptly prepare and
deliver to the members of the JRDC minutes of such meetings for review and
approval of the parties.

        2.3 DECISION-MAKING PROCESS. Each party will have [***] on the JRDC, and
decisions by the JRDC will be made [***]. [***] disagreement [***] will be
resolved within the JRDC based on the efficient achievement of the objectives of
this Agreement. Any disagreement, which cannot be resolved by the JRDC, will be
referred to the appropriate chief executive officers of Aurora and Hyseq for
resolution. It is the intent of the parties to resolve issues through the JRDC
whenever possible and to refer issues to the officers of Aurora and Hyseq only
when resolution through the JRDC cannot be achieved, however, this shall not in
any event limit or waive any other rights or remedies otherwise available to the
parties.

                                    ARTICLE 3
           SCOPE OF COLLABORATION; ACTIVITIES UNDER THE COLLABORATION

        3.1 OBJECTIVES; LIMITATIONS. During the Collaboration Period, Aurora
will have [***] for the activities described in Sections 3.2(a) and 3.3(a), and
Hyseq will have [***] for the activities described in Section 3.2(b) and 3.3(b).
Except as specifically provided herein, all activities of the parties outside of
the Collaboration are outside of the scope of this Agreement,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

and nothing contained herein is intended to limit either party from using any
intellectual property Controlled by such party for other purposes.

        3.2 OSP PROGRAM. During the Collaboration Period, Aurora and Hyseq will
conduct research and development of Hyseq Products pursuant to a detailed
research and development program (the "OSP Program"), a copy of which is
attached hereto and incorporated herein by reference as Exhibit D. Any
inconsistency between the provisions in this Agreement and Exhibit D will be
resolved in favor of the main body of this Agreement.

               (a) AURORA CONTRIBUTIONS. Aurora will (i) use its CellSensor
Panel to screen a minimum of [***] OSPs during each year of the Collaboration
Period (but no more than a total of [***] OSPs during the Collaboration Period),
(ii) provide all such initial screening data to Hyseq within [***] after
delivery of such OSPs to Aurora, and (iii) provide to Hyseq a Data Package for
each OSP selected by Hyseq based on such initial screening data, within [***]
following receipt of written notice from Hyseq of its desire to receive a Data
Package for such OSP.

               (b) HYSEQ CONTRIBUTIONS. During the Collaboration Period, Hyseq
(i) will provide to Aurora between [***] and [***] full-length cDNAs from its
OSP collection of [***] gene sequences for screening using Aurora's CellSensor
Panel, delivered in an initial block of [***] OSPs and minimum blocks of [***]
OSPs thereafter, and (ii) upon review of the initial screening data, will select
a minimum of [***] OSPs during the Collaboration Period for which Hyseq desires
to receive Data Packages from Aurora and will provide Aurora written notice of
such selection. Hyseq will own the Data Packages and they will be Confidential
Information of Hyseq hereunder, regardless of whether they have been identified
as such.

        3.3 TARGET PROGRAM. During the Collaboration Period, Aurora and Hyseq
will conduct research and development of Aurora Products pursuant to a detailed
research and development program (the "Target Program"), a copy of which is
attached hereto and incorporated herein by reference as Exhibit E. Any
inconsistency between the provisions in this Agreement and Exhibit E will be
resolved in favor of the main body of this Agreement.

               (a) AURORA CONTRIBUTIONS. Aurora will (i) develop between [***]
and [***] Aurora Assays during each year of the Collaboration Period using up to
[***] Hyseq Targets chosen by Aurora, (ii) screen the Aurora Assays during the
Collaboration Period against [***] compounds from the Aurora Compound Library,
and (iii) provide to the JRDC, all data and results generated by Aurora during
the Collaboration Period (other than [***]) and, (iv) if reasonably requested by
Hyseq, the [***] of compounds identified by Aurora in Primary Screening and
confirmed in Secondary Screening [***], or as agreed to by the parties
hereunder. Aurora will provide to the JRDC any additional data or results which
identify or correct inaccuracies in or conflicts between previous data and
results provided by Aurora to the JRDC under this Section 3.3(a). Aurora will
own all data and results generated by Aurora under the Target Program and hereby
grants to Hyseq the non-exclusive, non-transferable right to use the same to
support the prosecution of patent applications on Hyseq Targets. Such data and
results will be considered Confidential Information of Aurora hereunder,
regardless of whether it has been identified as Confidential Information,
however Hyseq is entitled to use such Confidential Information in accordance
with the terms of this Agreement.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

 Aurora will notify Hyseq in writing [***] after which Hyseq will have the right
to use such information to support the prosecution of patent applications on
Hyseq Targets. Notwithstanding the foregoing, Aurora retains the right to file
patent applications covering the [***].

               (b) HYSEQ CONTRIBUTIONS. Hyseq (i) will provide Aurora access to
the Hyseq Gene Sequences from which Aurora, with Hyseq's support and assistance,
will during the Collaboration Period, select and prioritize members of the
Active Cloning Pool, from which Hyseq will clone Hyseq Targets for the Target
Program, (ii) will deliver to Aurora from the Active Cloning Pool full-length,
sequence-verified cDNAs for between [***] and [***] Hyseq Targets during each
year of the Collaboration Period, for a total of at least [***] and up to [***]
Hyseq Targets during the Collaboration Period; provided, however, that Hyseq
will be required to provide no more than [***] Hyseq Targets to Aurora in any
given month, and (iii) will regularly provide Aurora and the JRDC, access to
[***], as well as any other relevant and unrestricted biological data in Hyseq's
Control all of which is Confidential Information of Hyseq, regardless of whether
it is identified as such, during the Collaboration Period, unless otherwise
extended for up to two additional years pursuant to Section 5.4(b) for use in
Aurora's selection of Hyseq Targets and the development of Aurora Products. Any
Hyseq Target delivered to Aurora under Section 3.3(b)(ii) above will be removed
from the Active Cloning Pool and may be replaced at Aurora's election in the
Active Cloning Pool with another gene sequence from the Hyseq Gene Sequences
selected by Aurora.

        3.4 COMMERCIALLY REASONABLE AND DILIGENT EFFORTS. Each party will use
Commercially Reasonable and Diligent Efforts to perform its responsibilities
under the Research Programs.

        3.5 AVAILABILITY OF RESOURCES; COOPERATION. Each party will maintain
laboratories, offices and/or other facilities reasonably necessary to carry out
the activities to be performed by such party pursuant to the Research Programs.
Unless otherwise agreed to in writing by Hyseq, Aurora will perform all of its
obligations under the OSP Program and the Target Program at [***]. Upon
reasonable advance notice, each party agrees to make its employees, agents and
consultants reasonably available at their respective places of employment to
consult with the other party during the Collaboration Period on issues arising
during the Collaboration and in connection with any request from any regulatory
agency, including, without limitation, regulatory, scientific, technical and
clinical testing issues

        3.6 DISCLOSURE; REPORTS. During the Collaboration Period, each party
will share all research data and results with the other party relating to the
Research Programs promptly after such data and results become available. During
the Collaboration Period, the parties will exchange, at a minimum, [***] written
reports presenting a meaningful summary of the activities performed and the
results obtained by such party pursuant to the Research Programs. In addition,
on reasonable request by either party, the other party will [***] to inform such
party of the details of the work performed under this Agreement. Information
disclosed by either party to the other party pursuant hereto may include
Confidential Information of the disclosing party and, whether Confidential
Information or not, may be used only in accordance with the rights granted under
Article 4 and Article 5 of this Agreement.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    ARTICLE 4
                                GRANT OF LICENSES

        4.1 NON-EXCLUSIVE LICENSE UNDER THE AURORA PATENTS. Subject to the terms
and conditions of this Agreement, Aurora hereby grants to Hyseq a non-exclusive,
non-transferable license under the Aurora Patents to make, use and import Aurora
Mutant GFP and Improvements made by Aurora during the License Period in the
Territory for use in the Field during the License Period.

        4.2 NON-EXCLUSIVE LICENSE UNDER THE STANFORD PATENTS. Subject to the
terms and conditions of this Agreement, Aurora hereby grants to Hyseq a
non-exclusive, non-transferable license under the Stanford Patents to make, use
and import Aurora Mutant GFP and Improvements made by Aurora during the License
Period in the Territory for use in the Field during the License Period.

        4.3 NON-EXCLUSIVE LICENSE TO AURORA TECHNOLOGY. Subject to the terms and
conditions of this Agreement, Aurora hereby grants to Hyseq a non-exclusive,
non-transferable license to make, use and import the Aurora Technology and
Improvements made by Aurora during the License Period in the Territory for use
in the Field during the License Period.

        4.4 LIMITATIONS. Except as otherwise expressly provided in this
Agreement, nothing in this Agreement is intended to convey or transfer ownership
by either party to the other party of any rights, title or interest in any
Confidential Information, patent rights, copyrights, trade secrets or other
intellectual property rights owned or Controlled by such party. Except as
expressly provided for in this Agreement, nothing in this Agreement will be
construed as a license or sublicense by either party to the other party of any
patent rights, copyrights, trade secrets or other intellectual property rights
owned or Controlled by such party. Aurora retains all rights that are not
expressly licensed by Aurora to Hyseq hereunder, including without limitation,
right to any Improvements made by Aurora during the License Period. Hyseq
retains all rights that are not expressly licensed by Hyseq to Aurora hereunder,
including, without limitation, rights to any Improvement made by Hyseq during
the License Period, and any products resulting from Hyseq's activities with
Aurora Mutant GFP and Improvements. Notwithstanding anything contained herein to
the contrary, the license rights granted to Hyseq in Sections 4.1, 4.2 and 4.3
do not include (a) the right to grant sublicenses, (b) the right to conduct any
activities outside the Field or outside the Territory under the Aurora Patents
or the Stanford Patents or with the Aurora Technology, (c) the right to transfer
any Material containing Aurora Technology (or any portion thereof) to any Third
Party, other than to an Affiliate of Hyseq, or (d) the right to conduct
activities within the Excluded Fields under the Aurora Patents or the Stanford
Patents or with the Aurora Technology.

        4.5 IMPROVEMENTS. Hyseq hereby grants to Aurora a worldwide, fully paid,
perpetual, non-exclusive license, including the right to grant sublicenses, to
make, have made, use, offer for sale, sell and import any Improvements made by
Hyseq during the License Period. Each party will promptly notify the other party
of the reduction to practice of such Improvements. Each party, to the extent it
has Control, will provide to the other party any tangible Materials related to
Improvements made by such party during the License Period. For clarity, Aurora
is [***] Improvements to Hyseq that were [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

        4.6 SERVICE. Aurora will prepare, aliquot and deliver the Aurora
Technology to Hyseq within 30 days after the Effective Date in the quantities
described on Exhibit C, and will offer Hyseq technical support in the use of
Aurora Technology through its help line. In the event of [***].

        4.7 LICENSE FOR TARGETS. Hyseq owns the Hyseq Targets and subject to the
terms and conditions of this Agreement, Hyseq hereby grants to Aurora a
worldwide license, including the right to grant sublicenses as set forth below,
under the Hyseq Patents to use the Hyseq Targets to identify, discover, develop,
make, have made, use, offer for sale, sell and import Aurora Products. With
respect to each Hyseq Target, such license will be exclusive during the
Exclusivity Period and will become non-exclusive thereafter; provided, however,
unless extended pursuant to Section 5.4(a), if Aurora (a) fails to develop an
Aurora Assay within [***] after receipt of the cDNA for a Hyseq Target, the
exclusive license for such Hyseq Target will terminate, or (b) fails to complete
Primary Screening and Secondary Screening of a Hyseq Target within [***] after
receipt of the cDNA for such Hyseq Target, then the exclusive license for such
Hyseq Target becomes a non-exclusive license for the Term of this Agreement;
provided further that, Aurora will not have the right to grant sublicenses under
a non-exclusive license until [***]. In no event does Aurora have the right to
license the Hyseq Targets on a stand-alone basis, independently from Aurora
technology or an Aurora Product. Aurora [***], and will notify Hyseq of each
sublicensee granted a license within (30) days after execution of each
sublicense agreement hereunder.

        4.8 RIGHTS TO OSPS. Hyseq owns and will own all right, title and
interest in and to any and all OSPs, provided by Hyseq to Aurora under the OSP
Program, including all rights to any data generated by Aurora from screening
such OSPs under the OSP Program, including, without limitation, the Data
Packages.

        4.9 RIGHTS TO OSP RECEPTORS. Aurora will notify Hyseq in writing of its
desire to clone any OSP Receptor. Within [***] following receipt of such notice,
Hyseq will notify Aurora in writing of (i) the exercise of its option under
Section 5.3(c) to have Aurora clone such OSP Receptors, or (ii) that it is or
plans to clone such OSP Receptor on its own or with a Third Party. If Hyseq
provides written notice that it is exercising its option under Section 5.3(c)
within such [***] period, then Hyseq will own all right, title and interest in
and to any such OSP Receptor. If Hyseq notifies Aurora that it is or will clone
such OSP Receptor on its own, or with a Third Party, then Aurora will not
attempt to clone the OSP Receptor with an OSP provided by Hyseq. If Hyseq
notifies Aurora in writing that it does not wish to exercise its option or is
not or does not plan to clone such OSP Receptors and gives Aurora permission to
clone such OSP Receptor, or if Hyseq fails to notify Aurora in writing of the
exercise of the option or that it is or will clone such OSP Receptor within such
[***] period, then, Aurora will have the right to attempt to clone such OSP
Receptor and will own all right, title and interest in and to such OSP Receptors
cloned. Subject to the terms and conditions of this Agreement, Aurora hereby
grants to Hyseq a worldwide, non-exclusive, non-transferable license to use any
such cloned OSP Receptor to identify, discover, develop, and commercialize Hyseq
Products. Subject to the terms and conditions of this Agreement, Hyseq hereby
grants to Aurora a worldwide, non-exclusive, non-transferable license, during
the Term, under the Hyseq Patents to use the specific OSP

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

necessary to clone a corresponding OSP Receptor as indicated herein and to use
such OSP that forms the OSP/OSP Receptor pair with any cloned OSP Receptor owned
by Aurora hereunder pursuant to 4.9(b) to, during the Term, (i) develop such
cloned OSP Receptor into assays and (ii) screen such OSP Receptor to identify,
develop and commercialize Aurora Products.

                                    ARTICLE 5
                          PAYMENT OBLIGATIONS; OPTIONS

        5.1 PAYMENTS TO AURORA.

               (a) LICENSE FEE. In consideration for the licenses granted to
Hyseq under Section 4.1, 4.2 and 4.3, Hyseq will pay to Aurora a non-creditable,
non-refundable license fee of [***] payable as follows: [***] within 10 days
after the Effective Date and [***] upon [***] of the Effective Date.

               (b) TECHNOLOGY ACCESS FEE. In consideration for the service of
the preparation and delivery of the Aurora Technology to Hyseq under Section
4.6, Hyseq will pay to Aurora a non-creditable, non-refundable technology access
fee of [***] within [***] after delivery of the Aurora Technology to Hyseq.

               (c) SCREENING OF OSPS. In consideration for screening OSPs under
the Collaboration, Hyseq will pay to Aurora a non-creditable, non-refundable
payment of [***] for each OSP screened by Aurora under the Collaboration. Such
payments will be calculated and reported for each calendar quarter during the
Collaboration Period. All payments due under this Section 5.1(c) will be paid
within [***] after the end of each calendar quarter.

               (d) DATA PACKAGES. In consideration for providing Data Packages
to Hyseq under the Collaboration, Hyseq will pay to Aurora a non-creditable,
non-refundable payment of [***] within [***] after delivery of each Data Package
to Hyseq. Notwithstanding the foregoing, Hyseq will pay to Aurora a minimum of
[***] during the Collaboration Period under this Section 5.1(d).

               (e) PERFORMANCE MILESTONE. Hyseq will pay to Aurora (i) a
one-time, non-creditable, non-refundable milestone payment of [***] within [***]
after Aurora completes screening of the first [***] OSPs using [***] approaches
thus demonstrating the feasibility of such approach (ii) a one-time,
non-creditable, non-refundable milestone payment of [***] within [***] after
Aurora completes screening of [***] OSPs provided by Hyseq to Aurora under the
Collaboration.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

               (f) CLINICAL MILESTONES. Hyseq will pay to Aurora the following
non-creditable, non-refundable milestone payments for the first, and only the
first, Hyseq Product within [***] following achievement of each of the following
milestone events:

                 Milestone                                    Payment
                 ---------                                    -------
                                                           
                 [***]                                         [***]

               (g) ROYALTIES. Hyseq will pay to Aurora a royalty equal to [***]
of Net Sales of each Hyseq Product sold by Hyseq or its sublicensees. Royalties
for sales of a Hyseq Product in any given country will be paid for a period
equal to the Royalty Term for such Hyseq Product in such country.

        5.2 PAYMENTS TO HYSEQ.

               (a) DATABASE ACCESS FEE. In consideration for access to Hyseq's
cDNA database under Section 3.3(b), Aurora will pay to Hyseq a non-creditable,
non-refundable payment of [***] within [***] after the Effective Date.

               (b) LICENSE FEE. In consideration for the license granted to
Aurora under Section 4.7, Aurora will pay to Hyseq a non-creditable,
non-refundable license fee of [***] within [***] after the Effective Date.

               (c) HYSEQ TARGETS SELECTED FOR SCREENING. Aurora will pay to
Hyseq a non-creditable, non-refundable payment of [***] for each Hyseq Target
for which Aurora develops an Aurora Assay during the Collaboration Period. Such
payments will be calculated and reported for each calendar quarter during the
Collaboration Period. All payments due under this Section 5.2(c) will be paid
within [***] after the end of each calendar quarter. Notwithstanding the
foregoing, Aurora will pay to Hyseq a minimum of [***] during the Collaboration
Period under this Section 5.2(c).

               (d) PERFORMANCE MILESTONE. If, during the Collaboration Period,
Aurora identifies chemical entities for at least [***] of the Hyseq Targets
screened by Aurora under the Target Program which demonstrate at least a [***]
over related public domain targets (as defined in the Target Program), then
Aurora will pay to Hyseq a one-time, non-creditable, non-refundable milestone
payment of [***] within [***] after the final report for the Target Program has
been received by Hyseq from Aurora.

               (e) CLINICAL MILESTONES. For each Hyseq Target, Aurora will pay
to Hyseq the following non-creditable, non-refundable milestone payments for the
first, and only the first, Aurora Product to achieve such milestone. This
payment will be made within [***] following achievement of each of the following
milestone events:

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                Milestone                                     Payment
                ---------                                     -------
                                                           
                [***]                                          [***]

               (f) ROYALTIES. Aurora will pay to Hyseq a royalty equal to [***]
of Net Sales for each Aurora Product sold by Aurora or its sublicensees.
Royalties for sales of an Aurora Product in any given country will be paid for a
period equal to the Royalty Term for such Aurora Product in such country.

        5.3 GRANT OF OPTIONS TO HYSEQ. Aurora hereby grants to Hyseq
non-transferable options exercisable by Hyseq during the Collaboration Period,
or as extended in Section 5.3(c):

               (a) to receive a non-exclusive, non-transferable, worldwide
license to any cell-based assay used by Aurora in the performance of the
Collaboration for internal use by Hyseq to optimize, develop and commercialize
Hyseq Products for [***] per cell line;

               (b) to purchase from Aurora single mg quantities of up to [***]
of Hyseq's OSPs, synthesized by a third party, for internal use (non-GMP) to
optimize, develop and commercialize Hyseq Products at [***];

               (c) for a period of [***] following the Collaboration Period, to
have Aurora clone OSP Receptors [***] for Hyseq for [***] per OSP Receptor,
payable as follows: an upfront, non-refundable, non-creditable payment of [***],
and [***] upon delivery; and/or

               (d) to have Aurora use its CellSensor Panel to screen up to [***]
additional OSPs (over and above the [***] OSPs set forth in Section 3.2(a))
during the Collaboration Period for [***] per OSP.

        5.4 GRANT OF OPTIONS TO AURORA. Hyseq hereby grants to Aurora
non-transferable options exercisable by Aurora during the Collaboration Period,
except as set forth in Section 5.4(b):

               (a) to extend the Exclusivity Period, the time to complete assay
development under Section 4.7, and the time to complete Primary Screening and
Secondary Screening under Section 4.7 on a Hyseq Target-by-Hyseq Target basis by
[***] for [***] per Hyseq Target;

               (b) for a period of [***] following the Collaboration Period, to
have Hyseq perform bioinformatics efforts utilizing Hyseq informatics tools and
database to support the Target Program [***] on Aurora's behalf on a [***] basis
in an amount equal to [***] per FTE per year prorated on a per hour worked
basis; and/or

               (c) to obtain additional Hyseq Targets (over and above the [***]
Hyseq Targets set forth in Section 3.3(b)) for assay development and screening
under the same terms and conditions as set forth in this Agreement, for [***]
per Hyseq Target.

        5.5 RIGHT OF FIRST NEGOTIATION. During the Exclusivity Period for any
Hyseq Target, Hyseq will provide written notice to Aurora of its intention to
license such Hyseq Target for

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

[***] applications. During the [***] period following such written notice from
Hyseq, Aurora will have the first right to negotiate an exclusive license to
such Hyseq Target for [***] applications that are [***] used in clinical
applications of Aurora Products related to such Hyseq Target upon [***] terms
[***].

                                    ARTICLE 6
                            PAYMENTS; RECORDS; AUDITS

        6.1 PAYMENT; REPORTS. Royalty payments will be calculated and reported
for each calendar quarter. All royalty payments due under this Agreement will be
paid within [***] after the end of each calendar quarter, unless otherwise
specifically provided herein. Each payment of royalties will be accompanied by a
report in sufficient detail to permit confirmation of the accuracy of the
royalty payment made, including, without limitation, Net Sales, the royalties
payable in United States dollars, the method used to calculate the royalty and
the exchange rates used.

        6.2 EXCHANGE RATE; MANNER AND PLACE OF PAYMENT. All payments hereunder
will be payable in United States dollars. With respect to each quarter, for
countries other than the United States, whenever conversion of payments from any
foreign currency will be required, such conversion will be made at the rate of
exchange reported in The Wall Street Journal on the last business day of the
applicable reporting period. Any payment due under this Agreement will be made
by wire transfer to a bank account designated by the party receiving such
payment, unless otherwise specified in writing by such party.

        6.3 LATE PAYMENTS. In the event that any payment, including royalty
payments, due hereunder is not made when due, the payment will accrue interest
from that date due at the rate of [***] per month; provided however, that in no
event will such rate exceed the maximum legal annual interest rate for the state
in which the party is located. The payment of such interest will not limit the
party receiving such payment from exercising any other rights it may have as a
consequence of the lateness of any payment.

        6.4 RECORDS AND AUDITS. During the Royalty Term and for a period of
[***] thereafter, each party will keep complete and accurate records in
sufficient detail to permit the other party to confirm the accuracy of all
royalty payments due to the other party hereunder. A party due royalty payments
will have the right to cause an independent, certified public accountant
reasonably acceptable to the other party to audit such records to confirm
royalty payments due under this Agreement. Such audits may be exercised during
normal business hours no more than [***] in any 12-month period upon at least
[***] prior written notice to the other party. The party exercising such audit
right will bear the full cost of such audit, unless such audit discloses an
underpayment by more than [***] of the amount due under this Agreement. In such
case, the other party will bear the full cost of such audit. In all events, the
other party will pay any underpayment with interest in accordance with Section
6.3.

        6.5 TAXES. All taxes levied on account of the royalties and other
payments accruing to each party under this Agreement shall be paid by the party
receiving such royalty or other payment for its own account, including taxes
levied thereon as income to the receiving party. If provision is made in law or
regulation for withholding, such tax shall be deducted from the

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

royalty or other payment made by the party making such payment to the proper
taxing authority and a receipt of payment of the tax secured and promptly
delivered to the party entitled to the royalty. Each party agrees to assist the
other party in claiming exemption from such deductions or withholdings under any
double taxation or similar agreement or treaty from time to time in force.

        6.6 PROHIBITED PAYMENTS. Notwithstanding any other provision of this
Agreement, if either party is prevented from paying any royalty due hereunder by
virtue of the statutes, laws, codes or governmental regulations of the country
from which the payment is to be made, then such royalty may be paid by
depositing funds in the currency in which accrued to the other party's account
in a bank acceptable to the other party in the country whose currency is
involved.

                                    ARTICLE 7
                             OWNERSHIP OF INVENTIONS

        Ownership of patentable subject matter conceived of or reduced to
practice in performance of the Collaboration will be determined in accordance
with the rules of inventorship under United States patent laws. Subject to
Article 4, Aurora will own all inventions conceived and reduced to practice
during performance of the Collaboration solely by its employees and agents, and
all patent applications and patents claiming such inventions. Subject to Article
4, Hyseq will own all inventions conceived and reduced to practice during
performance of the Collaboration solely by its employees and agents, and all
patent applications and patents claiming such inventions. The parties agree to
promptly exert all reasonable efforts, including the execution and delivery of
any and all papers, instruments or affidavits necessary to effectuate the
ownership rights stated in Article 4. Subject to Article 4, all inventions
conceived and reduced to practice during performance of the Collaboration
jointly by employees or agents of Aurora and employees or agents of Hyseq, and
all patent applications and patents claiming such inventions, will be owned
jointly by Aurora and Hyseq ("Joint Inventions"). The parties will determine via
the JRDC which party will be responsible for the filing, prosecution and
maintenance of jointly owned patent applications and patents. Each party (a)
will [***] regarding the filing, prosecution and maintenance of patent
applications claiming Joint Inventions, and (b) will keep the other party
advised of the status of such filing, prosecution and maintenance. Each party
agrees to cooperate fully in the preparation, filing and prosecution of patent
applications claiming Joint Inventions, including, without limitation, (i)
executing all papers and instruments, or requiring its employees or agents, to
execute such papers and instruments, so as to enable the other party to apply
for and to prosecute patent applications claiming Joint Inventions in any
country, and (ii) promptly informing the other party of any matters coming to
such party's attention that may affect the preparation, filing or prosecution of
an such patent applications.

                                    ARTICLE 8
                          CONFIDENTIALITY; PUBLICATIONS

        8.1 NONDISCLOSURE. During the Term and for a period of [***] thereafter,
each party will maintain all Confidential Information of the other party as
confidential and will not disclose any such Confidential Information or any
summary or part thereof, to any Third Party or use, or enable any Third Party to
use, any such Confidential Information for any purpose, except (a) as

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

expressly authorized by this Agreement, or (b) to the extent such use or
disclosure is reasonably necessary in filing or prosecuting patent applications,
[***], complying with applicable law, governmental regulation or court order,
submitting information to tax or other governmental authorities, making a
permitted sublicense or otherwise exercising its rights hereunder; provided,
however, that if a party is required to make any such disclosure of the other
party's Confidential Information, other than pursuant to a confidentiality
agreement, it will give reasonable advance written notice to the other party of
such disclosure, and will use [***] efforts to secure confidential treatment of
such information prior to its disclosure (whether through protective orders or
otherwise). Each party may disclose Confidential Information of the other party
to its sublicensees, employees, agents, consultants and other representatives to
the extent required to accomplish the purposes of this Agreement, so long as
such persons are under an obligation of confidentiality no less stringent than
as set forth herein. Each party will use at least the same standard of care as
it uses to protect its own Confidential Information and will remain liable in
the event any sublicensees, employees, agents, consultants and other
representatives make any unauthorized use or disclosure of the other party's
Confidential Information. Each party will promptly notify the other party upon
discovery of any unauthorized use or disclosure of the other party's
Confidential Information.

        8.2 PUBLICATIONS. Each party recognizes that the publication of papers
regarding results of the research and development activities performed under the
Collaboration, including oral presentations and abstracts, may be beneficial to
both parties provided such publications are subject to reasonable controls to
protect Confidential Information. In particular, it is the intent of the parties
to maintain the confidentiality of any Confidential Information included in any
foreign patent application until such foreign patent application has been
published. Accordingly, each party will have the right to review and approve any
paper proposed for publication by the other party, including oral presentations
and abstracts, which utilizes data generated from the Collaboration and/or
includes Confidential Information of the other party. Before any such paper is
submitted for publication, the party proposing publication will deliver a
complete copy to the other party at least [***] prior to submitting the paper to
a publisher. The receiving party will review any such paper and give its
comments to the publishing party within [***] of the delivery of such paper to
the receiving party. With respect to oral presentation materials and abstracts,
the parties will make reasonable efforts to expedite review of such materials
and abstracts, and will return such items as soon as practicable to the
publishing party with appropriate comments, if any, but in no event later than
[***] from the date of delivery to the receiving party. The publishing party
will comply with the other party's request to delete references to such other
party's Confidential Information in any such paper and agrees to withhold
publication of such paper for an additional [***] to permit the parties to
obtain patent protection, if either party deem it necessary, in accordance with
the terms of this Agreement.

                                    ARTICLE 9
                    REPRESENTATIONS, WARRANTIES AND COVENANTS

        9.1 CORPORATE POWER. Each party hereby represents and warrants that such
party is duly organized and validly existing under the laws of the state of its
incorporation and has full corporate power and authority to enter into this
Agreement and to carry out the provisions hereof.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

        9.2 DUE AUTHORIZATION. Each party hereby represents and warrants that
such party is duly authorized to execute and deliver this Agreement and to
perform its obligations hereunder. Each party represents and warrants to the
other party that it has the necessary authority to grant the licenses to the
other party contained herein.

        9.3 BINDING OBLIGATION. Each party hereby represents and warrants that
this Agreement is a legal and valid obligation binding upon it and is
enforceable in accordance with its terms. The execution, delivery and
performance of this Agreement by such party does not conflict with any
agreement, instrument or understanding, oral or written, to which it is a party
or by which it may be bound, or, to its knowledge, violate any law or regulation
of any court, governmental body or administrative or other agency having
authority over it.

        9.4 COVENANT NOT TO [***]. Neither party will [***].

        9.5 AURORA TECHNOLOGY. Except as expressly licensed herein, [***].

        9.6 LIMITATION ON WARRANTIES. Except as expressly set forth in this
Agreement, nothing herein will be construed as a representation or warranty by
either party that use of any intellectual property transferred, licensed or
otherwise made available hereunder does not infringe any intellectual property
right of any Third Party. Neither party makes any warranties, express or
implied, concerning the success of the Research Programs or the commercial
utility of any Product. [***].

        9.7 DISCLAIMER OF WARRANTIES. EXCEPT AS EXPRESSLY SET FORTH IN THIS
AGREEMENT, NEITHER PARTY MAKES ANY REPRESENTATION OR WARRANTY TO THE OTHER PARTY
OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

        9.8 LIMITATION OF LIABILITY. NEITHER PARTY WILL BE ENTITLED TO RECOVER
FROM THE OTHER PARTY ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL OR PUNITIVE DAMAGES
IN CONNECTION WITH THIS AGREEMENT OR ANY LICENSE GRANTED HEREUNDER.

        9.9 MUTUAL INDEMNIFICATION. Each party hereby agrees to save, defend,
indemnify and hold harmless the other party and its officers, directors,
employees, consultants and agents from and against any and all losses, damages,
liabilities, expenses and costs, including reasonable legal expense and
attorneys' fees ("Losses"), to which the indemnified party may become subject as
a result of any claim, demand, action or other proceeding by any Third Party to
the extent such Losses arise directly or indirectly out of (a) [***] the
indemnifying party hereunder, or (b) [***] by such indemnified party or
sublicensees, except to the extent such Losses result from the gross negligence
or willful misconduct of the party claiming a right of indemnification under
this Section 9.9. In the event either party seeks indemnification under this
Section 9.9, it will inform the other party of a claim as soon as reasonably
practicable after it receives notice of the claim, will permit the other party
to assume direction and control of the defense of the claim (including the right
to settle the claim

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

solely for monetary consideration), and will cooperate as requested (at the
expense of the other party) in the defense of the claim.

                                   ARTICLE 10
                              TERM AND TERMINATION

        10.1 TERM. This Agreement will commence on the Effective Date and will
continue until (i) the expiration of the last to expire of the Aurora Patents,
the Stanford Patents or the Hyseq Patents, or (ii) the last royalty obligation
due hereunder is paid, whichever is later, unless terminated earlier as provided
herein (the "Term").

        10.2 TERMINATION FOR CAUSE. Either party may terminate this Agreement
prior to the expiration of the Term upon the occurrence of any of the following:

               (a) Upon or after the bankruptcy, insolvency, dissolution or
winding up of the other party (other than dissolution or winding up for the
purposes of reconstruction or amalgamation); or

               (b) Upon or after the breach of any material provision of this
Agreement by the other party if the breaching party has not cured such breach
within [***] after written notice thereof by the non-breaching party.

        10.3 TERMINATION OF OSP PROGRAM BY AURORA. If Aurora is unable to use
[***] approaches to screen OSPs under the OSP Program, then Aurora may terminate
the OSP Program upon: (i) providing a written summary to the JRDC by Aurora
which sets forth the efforts undertaken and all results obtained by Aurora in
attempting to develop and use the [***] approaches to screen OSPs, (ii)
providing [***] written notice to Hyseq, and (iii) paying to Hyseq [***]. Upon
payment of such amount to Hyseq, Aurora will have no further obligations to
Hyseq under Section 3.2(a) regarding the OSP Program, other than the obligations
of confidentiality set forth in this Agreement. All other rights and obligations
of the parties under this Agreement will survive the termination of the OSP
Program pursuant to this Section 10.3.

        10.4 EFFECT OF TERMINATION.

               (a) Upon termination of this Agreement by Aurora under Section
10.2, (i) the licenses granted by Aurora to Hyseq under Article 4 will
terminate, and (ii) the licenses granted by Hyseq to Aurora under Article 4 will
remain in full force and effect for so long as Aurora is not in breach of its
obligations to Hyseq under this Agreement. Upon termination of this Agreement by
Hyseq under Section 10.2, (i) the licenses granted by Hyseq to Aurora under
Article 4 will terminate, and (ii) the licenses granted by Aurora to Hyseq under
Article 4 will remain in full force and affect for so long as Hyseq is not in
breach of its obligations to Aurora under this Agreement.

               (b) Expiration or termination of this Agreement will not relieve
the parties of any obligation accruing prior to such expiration or termination.
Except as set forth below or elsewhere in this Agreement, the obligations and
rights of the parties under Sections 3.3(a) 4.4,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

4.8, 6.4, 9.7, 9.8, 9.9, 10.3 and 10.4 and Articles 1, 7, 8 and 11 will survive
the expiration or termination of this Agreement.

               (c) Within 30 days following the expiration or termination of
this Agreement (except to the extent either party retains a license as
contemplated by Section 10.2(a) or 10.2(b) above), each party will return to the
other party, or destroy, upon the written request of the other party, any and
all Confidential Information and Materials of the other party in its possession,
provided, however, that each party may keep one copy of such Confidential
Information for the sole purpose of complying with its obligations hereunder.

                                   ARTICLE 11
                                  MISCELLANEOUS

        11.1 ASSIGNMENT. Except as expressly provided hereunder, neither this
Agreement nor any rights or obligations hereunder may be assigned or otherwise
transferred by either party without the prior written consent of the other party
(which consent will not be unreasonably withheld); provided, however, that
during the Collaboration Period Aurora may assign this Agreement and the rights
and obligations hereunder to Vertex Pharmaceuticals Incorporated ("Vertex")
without Hyseq's consent in connection with the merger of Aurora with Vertex as
required by operational law, contract or otherwise; provided further, that
following the expiration of the Collaboration Period, either party may assign
this Agreement and its rights and obligations hereunder without the other
party's consent (a) in connection with the transfer or sale of all or
substantially all of the business of such party to which this Agreement relates
to a Third Party, whether by merger, sale of stock, sale of assets or otherwise,
or (b) to an Affiliate, provided that any such assignment to an Affiliate will
not relieve the assigning party of its responsibilities for performance of its
obligations under this Agreement. The rights and obligations of the parties
under this Agreement will be binding upon and inure to the benefit of the
successors and permitted assigns of the parties. Any assignment not in
accordance with this Agreement is null and void.

        11.2 FORCE MAJEURE. Neither party will be held liable or responsible to
the other party nor be deemed to have defaulted under or breached this Agreement
for failure or delay in fulfilling or performing any term of this Agreement
(other than non-payment) if (a) such failure or delay is caused by or results
from causes beyond the reasonable control of the affected party, including, but
not limited to, fire, floods, el nino, la nina, embargoes, war, acts of war
(whether war be declared or not), insurrections, riots, civil commotions,
strikes, lockouts or other labor disturbances, acts of God or acts, omissions or
delays in acting by any governmental authority or the other party, and (b) the
affected party has exerted all reasonable efforts to avoid or remedy such force
majeure event; provided, however, that in no event will either party be required
to settle any labor dispute or disturbance.

        11.3 GOVERNING LAW. This Agreement will be governed by, and construed
and enforced in accordance with, the laws of the State of California, as such
laws apply to agreements between California residents performed entirely within
the State of California, except that questions affecting the construction and
effect of any patent will be determined by the law of the country in which such
patent is issued.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

        11.4 NOTICES. All notices and other communications provided for
hereunder will be in writing and will be mailed by first-class, registered or
certified mail, postage paid, or delivered personally, by overnight delivery
service or by facsimile, computer mail or other electronic means, with
confirmation of receipt, addressed as follows:

        IF TO AURORA:              AURORA BIOSCIENCES CORPORATION
                                   11010 Torreyana Road
                                   San Diego, CA 92121
                                   Fax: (858) 404-6713
                                   Attn: President

        IF TO HYSEQ:               HYSEQ, INC.
                                   670 Almanor Ave.
                                   Sunnyvale, CA 94085
                                   Fax: (408) 524-8145
                                   Attn: Legal Department

        Either party may by like notice specify or change an address to which
notices and communications will thereafter be sent. Notices sent by facsimile,
computer mail or other electronic means will be effective upon confirmation of
receipt, notices sent by mail or overnight delivery service will be effective
upon receipt, and notices given personally will be effective when delivered.

        11.5 WAIVER. Except as specifically provided for herein, the waiver from
time to time by either party of any right or failure to exercise any remedy will
not operate or be construed as a continuing waiver of the same right or remedy
or of any other of such party's rights or remedies provided in this Agreement.

        11.6 SEVERABILITY. If any provision of this Agreement is or becomes
invalid, is ruled illegal by a court of competent jurisdiction or is deemed
unenforceable under the current applicable law from time to time in effect
during the Term, the remainder of this Agreement will not be affected or
impaired thereby and will continue to be construed to the maximum extent
permitted by law. In lieu of any provision which is invalid, illegal or
unenforceable, there will be substituted or added as part of this Agreement by
mutual written agreement of the parties or arbitration, a provision which is (a)
as similar as possible in economic and business objectives as intended by the
parties to such invalid, illegal or unenforceable provision, and (b) valid,
legal and enforceable.

        11.7 INDEPENDENT CONTRACTORS. It is expressly agreed that Aurora and
Hyseq will be independent contractors and that the relationship between the
parties will not constitute a partnership or agency of any kind. Neither Aurora
nor Hyseq will have the authority to make any statements, representations or
commitments of any kind, or to take any action, which will be binding on the
other party, without the prior written consent of the other party.

        11.8 ENTIRE AGREEMENT; AMENDMENT. This Agreement (including the exhibits
attached hereto) sets forth all of the agreements and understandings between the
parties with respect to the subject matter hereof and supersedes and terminates
all prior agreements and

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

understandings between the parties. There are no agreements or understandings,
either oral or written, between the parties other than as set forth herein.
Notwithstanding the foregoing, any disclosure made by either party pursuant to
the Mutual Non-Disclosure Agreement between the parties dated December 15, 2000
will continue to be governed by the terms and conditions of such agreement. No
subsequent modification, amendment, change or addition to this Agreement will be
binding upon the parties, unless reduced to writing and signed by the respective
authorized officers of the parties.

        11.9 HEADINGS AND PLURALITY. The captions and plurality of defined terms
contained in this Agreement are not substantively a part of this Agreement, but
are merely guides or labels to assist in locating and reading the several
articles hereof.

        11.10 USE OF TRADEMARKS. Neither party will use the names, trademarks,
or any adaptation thereof of the other in any advertising, promotional or sales
activities without the prior written consent obtained, except that the parties
may state that they are licensed under one or more of the patents and/or
applications granted hereunder.

        11.11 COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument. Counterparts may be signed
and delivered by facsimile, each of which will be binding when sent.

        IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed by their duly authorized officers as of the Effective Date.

AURORA BIOSCIENCES CORPORATION                    HYSEQ, INC.

By: /s/ Michael J. Dunn                           By: /s/ Ted W. Love
   ----------------------------------------          --------------------------

Name: Michael J. Dunn                             Name: Ted W. Love
     --------------------------------------            ------------------------

Title: Vice President, Business Development       Title: President and CEO
      -------------------------------------             -----------------------

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    EXHIBIT A

                                 AURORA PATENTS

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Title                         Patent Number      Serial Number   Filing Date
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- --------------------------------------------------------------------------------

Hyseq Indemnification for Products or Services Arising from License Granted
Herein. With respect to rights licensed to Aurora by the Howard Hughes Medical
Institute ("HHMI") or by The Regents of the University of California ("UC"),
Hyseq hereby agrees to indemnify, defend and hold harmless HHMI or UC, as
appropriate, and their respective officers, directors, employees, sponsors and
agents from and against all damages or other amounts payable to a Third Party
(including product liability) resulting or arising from Hyseq's use of the
rights granted herein to the extent that such indemnification by Hyseq is
required by HHMI or UC pursuant to agreements between HHMI and Aurora or between
UC and Aurora.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    EXHIBIT B

                                STANFORD PATENTS

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Title                            Patent Number   Serial Number     Filing Date
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[***]                            [***]           [***]             [***]
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Disclaimer of Warranties. EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT,
PURSUANT TO THE STANFORD AGREEMENT, STANFORD MAKES NO REPRESENTATIONS AND
EXTENDS NO WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED. THERE ARE NO
EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, OR THAT THE USE OF THE STANFORD LICENSED PRODUCTS OR SERVICES WILL NOT
INFRINGE ANY PATENT, COPYRIGHT, TRADEMARK\ OR OTHER RIGHTS OR ANY OTHER EXPRESS
OR IMPLIED WARRANTIES. Pursuant to the Stanford Agreement, nothing is this
Agreement is or will be construed as:

        (a) A warranty or representation by Stanford as to [***];

        (b) A warranty or representation that anything made, used, sold or
otherwise disposed of under any license granted in this Agreement [***];

        (c) An obligation to [***], except to the extent and in the
circumstances described in Article 11 of the Stanford Agreement;

        (d) Granting by implication, estoppel or otherwise any licenses or
rights under patents or other rights of Stanford or other persons other than the
Stanford Patents, regardless of whether such patents or other rights are [***]
to any of the Stanford Patents; or

        (e) An obligation to furnish any technology or technological information
other than the technology as set forth herein.

Stanford Names and Marks. Pursuant to the Stanford Agreement, Aurora and Hyseq
agree that Hyseq will not identify Stanford in any promotional advertising or
other promotional materials to be disseminated to the public or any portion
thereof or to use the name of any Stanford faculty member, employee or student
or any trademark, service mark, trade name or symbol of Stanford or the Stanford
University Hospital, or that is associated with either of them, without
Stanford's prior written consent. Stanford gives consent to Hyseq to identify
Herzenberg and Nolan as authors of their respective papers and to identify the
Stanford Patents.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

Indemnification. Pursuant to the Stanford Agreement, Hyseq will indemnify, hold
harmless and defend Stanford and Stanford University Hospital and their
respective trustees, officers, employees, students and agents ("Indemnitees")
against any and all claims for death, illness, personal injury, property damage
and improper business practice arising out of the manufacture, use, sale or
other disposition of the Stanford Patents or Stanford Licensed Product(s) by
Hyseq or its customers, except to the extent any such claims or losses are
caused by the intentional misconduct, gross negligence or breach of the
representations and warranties made under the Stanford Agreement by Indemnitee;
and provided further that in the event of any such claim, Indemnitee will give
prompt written notice to Hyseq and Hyseq will manage and control, at its sole
expense, the defense and settlement of such claim, provided, however, that Hyseq
will not settle any suit involving the rights of such Indemnitee without
obtaining its prior written consent, which consent will not be unreasonably
withheld, and provided further that such Indemnitee will fully cooperate with
Hyseq.

Limitation of Liability. Pursuant to the Stanford Agreement, Stanford will not
be liable for any indirect, special, consequential or other damages whatsoever,
whether grounded in tort (including negligence), strict liability, contract or
otherwise. Stanford will not have any responsibilities or liabilities whatsoever
with respect to Stanford Licensed Product(s).

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    EXHIBIT C

                                AURORA TECHNOLOGY

[***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    EXHIBIT D

                                   OSP PROGRAM

HYSEQ:

- -    [***].

AURORA:

- -    [***].

- -    [***].

APPENDIX I- CELLSENSOR ASSAYS RELEVANT FOR OSP SCREENING

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CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                             
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[***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    EXHIBIT E

                                 TARGET PROGRAM

HYSEQ:

- -    [***].

[***].

[***].

AURORA:

- -    [***].

APPENDIX II  -  ASSAY VALIDATION.

[***].

[***].

[***].

                             [***]
[***].

[***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                                                   EXHIBIT 10.17

                            COLLABORATION AGREEMENT

        THIS COLLABORATION AGREEMENT (this "AGREEMENT") is made effective as of
the 11th day of August 2001 (the "EFFECTIVE DATE") by and between Hyseq, Inc., a
corporation organized under the laws of Delaware, having offices at 670 Almanor
Avenue, Sunnyvale, California 94085 USA ("HYSEQ"), and Kirin Brewery Company,
Ltd., a corporation organized under the laws of Japan, having offices at 10-1,
Shinkawa 2-chome, Chuo-ku, Tokyo 104-8288, Japan, ("Kirin"). Hyseq and Kirin are
sometimes referred to herein individually as a "PARTY" and collectively as the
"PARTIES."

                                    RECITALS

        1. Hyseq owns or has rights under certain patents, patent applications,
technology, know-how and other intellectual property relating to gene and
protein discovery and expression, and may develop or acquire additional such
rights.

        2. Kirin owns or has rights under certain patents, patent applications,
technology, know-how and other intellectual property relating to gene and
protein discovery and expression, and may develop or acquire additional such
rights.

        3. The Parties wish to collaborate in the research and development of
new protein, antibody and macromolecular therapeutics directed to human
diseases, including, but not limited to, hematopoietic and inflammatory
diseases, in accordance with the terms and conditions set forth herein.

        4. The Parties may also collaborate in the marketing and sale of certain
products resulting from such research and development efforts in accordance with
the terms and conditions set forth herein.

        In consideration of the premises and of the mutual covenants and
obligations set forth herein, the Parties hereby agree as set out below.

                                    ARTICLE 1

                                   DEFINITIONS

        The following capitalized terms shall have the following meanings:

        1.1 "ADDITIONAL TECHNOLOGY" shall have the meaning set forth in Section
3.5.1.

        1.2 "AFFILIATE" means any individual, corporation, association or other
business entity which directly or indirectly controls, is controlled by or is
under common control with the Party in question. As used in this definition of
"Affiliate" only, the term "control" means the direct or indirect ownership of
more than fifty percent (50%) of the stock having the right to vote for
directors thereof or the ability to otherwise control the management of the
corporation or other business entity whether through the ownership of voting
securities, by contract, resolution, regulation or otherwise; provided that, if
local law requires a minimum percentage of local

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

ownership, control will be established by direct or indirect beneficial
ownership of one hundred percent (100%) of the maximum ownership percentage that
may, under such local law, be owned by foreign interests.

        1.3 "APPLICABLE LAWS" means all laws, statutes, ordinances, codes, rules
and regulations which have been enacted by a governmental authority and are in
force as of the Effective Date or come into force during the term of this
Agreement, in each case to the extent that the same are applicable to the
performance by the Parties of their respective obligations under this Agreement.

        1.4 "APPROVAL APPLICATION" means any application necessary or
appropriate to obtain a Regulatory Approval, together with all required
documents, data and information concerning the New Product which is the subject
of such application.

        1.5 "AUDITED PARTY" shall have the meaning set forth in Section 3.4.3.

        1.6 "AUDITING PARTY" shall have the meaning set forth in Section 3.4.3.

        1.7 "BANKRUPTCY CODE" shall have the meaning set forth in Section 11.10.

        1.8 "BENCH SCIENTIST" means, as to a Party, an employee of such Party
having both an advanced scientific degree and the qualifications, skill and
experience adequate for the tasks assigned to such employee by such Party in
performance of the R&D Plan.

        1.9 "CHANGE OF CONTROL," as to a Party, means a change in Control of
such Party by merger or reorganization, sale or other transfer of business and
assets, sale or other transfer of capital stock, or similar transaction, whether
in a single transaction or series of related transactions, as a result of which
any Person (or any group of related Persons) that did not directly or indirectly
Control such Party prior to the transaction (or series of transactions)
thereafter directly or indirectly Controls such Party.

        1.10 "CONTROL" (including "Controlled," "Controls" and other forms)
shall mean (except with respect to the definition of Affiliate), as to a Person:
(a) ownership or control, directly or indirectly, of more than fifty percent
(50%) of the voting securities of the Person or, in the case of a noncorporate
Person, equivalent interests or (b) the right or power to designate more than
fifty percent (50%) of the governing authority (e.g., board of directors) of the
Person (whether through management contract, voting rights agreement or similar
means).

        1.11 "DEVELOPMENT CANDIDATE" means a specific molecule, such as a
protein, antibody, or other macromolecule, selected and approved by the JRDC for
R&D Work under the R&D Plan in accordance with the terms and conditions of this
Agreement.

        1.12 "DEVELOPMENT FUNDING" shall have the meaning set forth in Section
3.2.

        1.13 "DEVELOPMENT WORK" shall have the meaning set forth in Section
2.1.1.

        1.14 "DISCLOSING PARTY" shall have the meaning set forth in Section 7.1.

        1.15 "DISPUTE" shall have the meaning set forth in Section 10.2.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       2

        1.16 "EFFECTIVE DATE" shall have the meaning set forth in the first
paragraph of this Agreement.

        1.17 "ENFORCING PARTY" shall have the meaning set forth in Section
5.5.4.

        1.18 "FIRST PARTY" shall have the meaning set forth in Section 5.1.6.

        1.19 "FTE" means the full time equivalent effort, for one calendar year,
of one individual participating directly and substantially in R&D Work on behalf
of a Party, or, in the case of less than a full-time dedicated scientific
person, a full-time, equivalent scientific person year, based upon a total of
fifty-two (52) weeks (i.e., two thousand eighty (2,080) hours) per year of such
R&D Work on behalf of a Party. The Parties shall agree upon standard cost
accounting procedures to determine FTE contributions properly allocable to the
R&D Work.

        1.20 "FTE RATE" means [***] per FTE, which rate shall apply to a Bench
Scientist and remain fixed and in effect for the duration of the term of this
Agreement, unless otherwise agreed upon by the Parties.

        1.21 "HYSEQ CLAIMS" shall have the meaning set forth in Section 9.2.

        1.22 "HYSEQ IMPROVEMENTS" means any improvements to or modifications of
the Hyseq Technology, excluding Joint Inventions, by any Party or its
Affiliates, either jointly or solely.

        1.23 "HYSEQ INDEMNIFIED PARTIES" shall have the meaning set forth in
Section 9.2.

        1.24 "HYSEQ TECHNOLOGY" means: all Patent Rights, all copyrights, trade
secrets and all other intellectual property rights and interests of every nature
(specifically including, but not limited to, unpatented inventions, ideas, data,
know-how, methods, processes, biological material, reagents, software and trade
secrets of any kind, and any other rights or interests in any Inventions) that
are: (i) owned by Hyseq or any its Affiliates (to the greatest extent that Hyseq
or its Affiliates has the right and authority to grant licenses as of the
Effective Date) or, if not so owned, as to which Hyseq or any of its Affiliates
otherwise has the right to grant licenses or sublicenses as of the Effective
Date (subject to any limitations imposed by a Third Party license); (ii) [***]
to perform the R&D Work or to make, have made, use, sell, offer for sale and/or
import Development Candidates or New Products; and (iii) as directed by the
JRDC.

        1.25 "HYSEQ TERRITORY" means the countries and multinational
jurisdictions listed in Exhibit A.

        1.26 "INDEMNIFIED PARTY" shall have the meaning set forth in Section
9.3.

        1.27 "INDEMNIFYING PARTY" shall have the meaning set forth in Section
9.3.

        1.28 "INFRINGEMENT" shall have the meaning set forth in Section 5.5.1.

        1.29 "INVENTIONS" means any and all creations, materials and
information, in any tangible or intangible form whatsoever and whether or not
patentable, relevant to or resulting from the research, discovery, development,
manufacture or commercialization of protein or antibody

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       3

therapeutics or diagnostics, including, without limitation, ideas, discoveries,
inventions, practices, methods, techniques, specifications, formulations,
formulas, knowledge, trade secrets, know-how, skill, experience, test data
(including pharmacological, biological, chemical, biochemical, toxicological and
clinical test data), analytical and quality control data, stability data,
results of studies, databases, technical drawings, software, works of authorship
and other related subject matter.

        1.30 "JOINT INVENTION" means any Invention (a) made in the course of
performance of the R&D Work or commercialization of a New Product, (b) by one or
more employees, agents or contractors of Hyseq or its Affiliates and/or Kirin or
its Affiliates, and (c) which comprises, or which is required to make, use,
sell, offer for sale or import, a Development Candidate or a New Product.

        1.31 "JOINT PATENTS" means, subject to Section 5.1.6, all Patent Rights
that claim, cover or are directed to Joint Inventions and Other Joint
Inventions.

        1.32 "JRDC" shall have the meaning set forth in Section 2.1.2.

        1.33 "KIRIN CLAIMS" shall have the meaning set forth in Section 9.1.

        1.34 "KIRIN IMPROVEMENTS" means any improvements to or modifications of
the Kirin Technology, excluding Joint Inventions, by any Party or its
Affiliates, either jointly or solely.

        1.35 "KIRIN INDEMNIFIED PARTIES" shall have the meaning set forth in
Section 9.1.

        1.36 "KIRIN TECHNOLOGY" means: all Patent Rights, copyrights, trade
secrets and all other intellectual property rights and interests of every nature
(specifically including, but not limited to, unpatented inventions, ideas, data,
know-how, methods, processes, biological material, reagents, software and trade
secrets of any kind, and any other rights or interests in any Inventions) that
are: (i) owned by Kirin or any its Affiliates (to the greatest extent that Kirin
or its Affiliates has the right and authority to grant licenses as of the
Effective Date) or, if not so owned, as to which Kirin or any of its Affiliates
otherwise has the right to grant licenses or sublicenses as of the Effective
Date (subject to any limitations imposed by a Third Party license); (ii) [***]
to perform the R&D Work or to make, have made, use, sell, offer for sale and/or
import New Products and (iii) as directed by the JRDC.

        1.37 "KIRIN TERRITORY" means the countries and multinational
jurisdictions listed in Exhibit B.

        1.38 "NET SALES" means the gross amount billed or invoiced by a Party or
its Affiliates or any of their Sublicensees for the sale or other disposition of
a New Product, less the following deductions: [***]. "Net Sales" does not
include amounts for any New Product furnished to a Third Party for which [***].
Furthermore, "Net Sales" excludes amounts from sales or other dispositions of
New Products between a Party and any of its Affiliates or between a Party (or
any of its Affiliates) and its Sublicensees, solely to the extent that such
entity purchasing the New Product resells such New Products to a Third Party.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       4

        1.39 "NEW PRODUCT" means any protein, antibody, or macromolecular
therapeutic or diagnostic product directly resulting from the Development Work
hereunder, including, without limitation, any Development Work performed with
respect to a Development Candidate.

        1.40 "OTHER JOINT INVENTION" means any Invention made in the course of
performance of the R&D Work or commercialization of New Products by the
employees, agents or contractors of Hyseq or its Affiliates and/or Kirin or its
Affiliates but excluding Joint Inventions, Hyseq Improvements, and Kirin
Improvements.

        1.41 "OTHER TERRITORY" means all countries of the world excluding those
countries in the Hyseq Territory or the Kirin Territory.

        1.42 "PATENT COSTS" means all preparation, filing, prosecution and
maintenance out-of-pocket fees and expenses (including attorneys' fees),
actually and reasonably incurred in connection with the establishment and
maintenance of Patent Rights.

        1.43 "PATENT RIGHTS" means (a) all issued patents and inventor's
certificates, and all patent applications throughout the world, including any
renewal, division, continuation, continued prosecution application or
continuation-in-part of any of such patents, certificates and applications, and
any and all patents issuing in respect thereof; (b) any and all reissues,
extensions, substitutions, confirmations, registrations, revalidations,
revisions, renewals, reexaminations, foreign counterparts of and additions to
any of the foregoing; and (c) all intellectual property rights and other
proprietary rights in, to and under the foregoing.

        1.44 "PERSON" means any individual or legal entity.

        1.45 "PRIOR ART INVENTION" shall have the meaning assigned to it in
Section 5.1.6.

        1.46 "PROJECT YEAR" means a twelve (12) month period in which one or
both Parties shall perform specific R&D Work approved by the JRDC under the R&D
Plan. Each Project Year shall commence as of its applicable Project Year
Commencement Date. For purposes of clarification, more than one Project Year may
be in progress at any time, and no two Project Years shall necessarily have the
same Project Year Commencement Date.

        1.47 "PROJECT YEAR COMMENCEMENT DATE," as to a Project Year, means the
date specified by the JRDC in the R&D Plan for such Project Year.

        1.48 "R&D PLAN" shall have the meaning set forth in Section 2.1.1.

        1.49 "R&D WORK" shall have the meaning set forth in Section 2.1.1.

        1.50 "RECEIVING PARTY" shall have the meaning set forth in Section 7.1.

        1.51 "REGULATORY APPROVAL" means, with respect to a nation or, where
applicable, a multinational jurisdiction, any approvals, licenses, registrations
or authorizations necessary for the manufacture, marketing and sale of a New
Product in such nation or jurisdiction.

        1.52 "RESEARCH FUNDING" shall have the meaning set forth in Section
3.1.1.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       5

        1.53 "RESEARCH WORK" shall have the meaning set forth in Section 2.1.1.

        1.54 "RESPONSIBLE EXECUTIVE" shall have the meaning set forth in Section
10.2.

        1.55 "RIGHT" shall have the meaning set forth in Section 11.7.

        1.56 "SECOND PARTY" shall have the meaning set forth in Section 5.1.6.

        1.57 "SUBLICENSEE" means an authorized or permitted licensee or
sublicensee of a Party or any of its Affiliates.

        1.58 "THIRD PARTY" means any Person other than Hyseq or Kirin or their
respective Affiliates.

                                    ARTICLE 2

                            RESEARCH AND DEVELOPMENT

        2.1 JOINT RESEARCH AND DEVELOPMENT COMMITTEE.

               2.1.1 In accordance with the terms and conditions set forth
below, the Parties shall conduct the research and development of Development
Candidates ("R&D WORK") pursuant to a mutually agreed plan approved (and as
amended from time to time) in accordance with this Article 2, including, at a
minimum and without limitation, the subject matter set forth in Exhibit C (the
"R&D PLAN"). The R&D Work shall consist of the two phases: (a) the discovery or
optimization of potential Development Candidates (the "RESEARCH WORK"), and (b)
the development of select Development Candidates into New Products (the
"DEVELOPMENT WORK").

               2.1.2 Within ten (10) days after the Effective Date, each Party
shall appoint three (3) individuals to serve as its representatives on a joint
research and development committee (the "JRDC"). The JRDC shall formulate and
approve the initial R&D Plan and, from time to time, any modifications or
amendments thereto. The initial R&D Plan shall include, at a minimum and without
limitation, the subject matter set forth in Exhibit C. The R&D Plan shall
specify the R&D Work to be performed by the Parties and the Project Year
Commencement Date therefor. Each Party shall have the right to change any or all
of its representatives on the JRDC upon written notice to the other Party,
provided that each Party shall appoint and maintain for the duration of the term
of this Agreement at least one senior management representative on the JRDC.

               2.1.3 The JRDC shall have authority over the design, management
and conduct of the R&D Work and, if applicable, the commercialization of New
Products. The JRDC may appoint individuals to serve as representatives on
subcommittees to assist the JRDC with respect to any particular subject matter
of the R&D Plan and, if applicable, the commercialization of New Products,
including, for example, product manufacturing, quality control and assurance,
preclinical studies design, implementation and evaluation, clinical protocols
design, implementation and evaluation, and regulatory affairs. Without limiting
the generality of the foregoing, the JRDC shall have the sole authority to:

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       6

               (a)    Develop and implement the R&D Plan, including, without
                      limitation, go/no-go criteria, timelines and
                      responsibilities with respect to the discovery,
                      optimization and development of Development Candidates,
                      which responsibilities may include [***];

               (b)    Develop and implement the budget for the Research Funding
                      and Development Funding;

               (c)    Monitor and make recommendations regarding compliance of
                      the Parties with the R&D Plan and the conduct of the R&D
                      Work;

               (d)    Develop and implement amendments and modifications to the
                      R&D Plan;

               (e)    Set priorities with respect to allocation of resources
                      under the R&D Plan;

               (f)    Review any and all proposed publications relating to the
                      R&D Plan or activities with respect to a Development
                      Candidate and the results therefrom, and any and all
                      proposed filings of patent applications in connection
                      therewith;

               (g)    List on Exhibit D all Patent Rights identified by each
                      Party that claim a Development Candidate or New Product,
                      provided that any and all Patent Rights that claim a Joint
                      Invention shall be deemed to be listed on Exhibit D;

               (h)    Direct prosecution of Joint Patents as provided in Section
                      5.4;

               (i)    Determine and direct the licensing and/or disposition of
                      any Joint Patents that claim Other Joint Inventions;

               (j)    Select Development Candidates for Development Work and
                      determine how such Development Work should occur;

               (k)    Monitor and review pre-clinical and clinical trials of
                      Development Candidates and Approval Applications for New
                      Products;

               (l)    Determine on an annual basis whether to continue or
                      discontinue performance of the R&D Plan or any R&D Work
                      thereunder;

               (l)    Coordinate each Party's activities with respect to the
                      commercialization of New Products, if applicable, and
                      establish each Party's rights and obligations with respect
                      to the launch, promotion, marketing and sale of New
                      Products in the Other Territory; and

               (m)    Decide which Party or Parties shall manufacture each New
                      Product, subject to a separate manufacturing agreement to
                      be negotiated in good faith by each Party.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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               2.1.4 During the term of this Agreement, and thereafter as set
forth in Section 8.4.2, if applicable, the JRDC shall meet, in person or by
telephone conference call, on an "as needed" basis (as determined by the JRDC)
to review progress of the R&D Plan. The JRDC shall hold regular meetings, in
person or by telephone conference call, as necessary, to discuss the progress of
the R&D Work and any all Inventions resulting therefrom; provided that the JRDC
shall meet at least one (1) time each quarter and shall hold at least two (2)
in-person meetings per year, with at least one (1) in-person meeting being held
at the offices of each Party each year. All decisions made or actions taken by
the JRDC shall be made in writing, signed by a JRDC representative of each
Party, and require the [***] of the Parties, with each Party entitled to [***]
vote. Any decision of or action by the JRDC without the [***] of the Parties
shall be null and void. A quorum of the JRDC shall consist of two members,
provided that at least one member appointed by each Party is present. The JRDC
shall keep meeting minutes and prepare a quarterly report for internal senior
management review by the Parties. The host Party at each in-person meeting shall
prepare the minutes for that meeting and the Parties will alternate preparing
minutes for each meeting held via telephone or video conference. All
disagreements arising out of the R&D Plan, R&D Work or prosecution of Patent
Rights during the term of this Agreement shall be referred to the JRDC. If the
JRDC is unable to resolve such disagreement within thirty (30) days, the matter
shall be resolved in accordance with the procedures set forth in Article 10.

        2.2 RESPONSIBILITIES OF THE PARTIES.

               2.2.1 Each Party shall be solely responsible for all R&D Work
assigned to such Party under the R&D Plan. If the R&D Plan fails to allocate
responsibility for any R&D Work to a particular party, the JRDC shall promptly
designate the responsible Party for such R&D Work. Each Party shall use [***]
efforts to perform the R&D Work for which it is responsible. Without limiting
the generality of the foregoing, each Party shall use [***] efforts to: (a)
commit sufficient internal resources to perform the R&D Work, (b) make available
to the other Party sufficient quantities of materials, as required under the R&D
Plan, for such Party to perform the R&D Work, (c) commit sufficient resources to
deliver and disclose technology (including trade secrets and know-how) required
to be so delivered and disclosed to the other Party in accordance with the R&D
Plan, (d) report all Inventions to the JRDC pursuant to Section 2.2.3, (e) carry
out its responsibilities with respect to prosecution of Joint Patents as
directed by the JRDC, and (f) cooperate, consult and share information with
respect to the establishment and progress of pre-clinical and clinical trials
and filings for Regulatory Approval.

               2.2.2 Each Party shall be solely responsible for the promotion,
marketing and sales of New Products (including all Regulatory Approval relating
thereto), and all costs associated with the foregoing, in the Hyseq Territory or
Kirin Territory, as applicable, and, as directed by the JRDC, the Other
Territory. Each Party shall use [***] efforts to promote, market and sell New
Products in the Hyseq Territory and Kirin Territory, as applicable, and, as
directed by the JRDC, the Other Territory.

               2.2.3 Each Party shall prepare and maintain detailed records of,
and regularly disclose to the JRDC and the other Party, any and all Inventions
and other related information created by or for such Party in connection with
the R&D Work. Such disclosure shall be made as provided for in the R&D Plan, but
in no event less than once per calendar quarter. Without limiting the generality
of the foregoing, each Party shall regularly provide the JRDC with information

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       8

sufficient to enable the JRDC to perform its obligations pursuant to Section
2.1, including, without limitation, reasonably detailed descriptions of the R&D
Work performed, the scheduling of ongoing or future R&D Work, resources
anticipated to accomplish the R&D Work, and any additional reasonable reporting
information required by the JRDC.

        2.3 RIGHT TO NEGOTIATE NEW AGREEMENT. At any time after any Development
Candidate approved by the JRDC for Development Work hereunder [***], either
Party may request the other Party to discuss alternative approaches and
contractual arrangements, to be memorialized in a separate agreement with
respect to the development, manufacturing and commercialization of New Products.
The other Party shall make appropriate representatives reasonably available to
confer with such Party regarding the terms and conditions of such separate
agreement for a period of [***], provided that nothing in this Agreement shall
be construed to require or obligate such other Party to enter into any such
separate agreement.

                                    ARTICLE 3

                               FUNDING; ROYALTIES

        3.1 RESEARCH FUNDING.

               3.1.1 The JRDC shall formulate and approve a budget to cover the
FTE contributions of Hyseq, and [***] costs and expenses actually incurred by
Hyseq, subject to [***], that are [***], in performance of the Research Work
during each Project Year (such approved budget referred to herein as the
"RESEARCH FUNDING"). Such [***] costs and expenses include, for example and
without limitation, approved outside services, contract manufacturing, contract
studies or consulting services, but exclude [***] costs and expenses incurred in
performance of the Research Work. Kirin shall be solely responsible for payment
of the Research Funding in accordance with Section 3.1.2. Within [***] after the
close of each quarter of any Project Year, Hyseq shall submit to Kirin a
detailed and accurate invoice, based on Hyseq's actual FTE contributions and the
FTE Rate, and any approved [***] expenses incurred, for Research Work conducted
by Hyseq during such quarter. Each such invoice shall identify each individual
performing Research Work by or on behalf of Hyseq together with a reasonably
detailed description of the Research Work performed by such individual, and the
time spent (on a monthly basis) by such individual performing such Research
Work. Kirin shall not be responsible for expenses incurred in any Project Year
by Hyseq with respect to Research Work that was not approved by the JRDC or to
the extent that such expenses exceed the budgeted amounts therefor.

               3.1.2 For each Project Year, Kirin shall pay the budgeted
Research Funding payments for Research Work conducted by Hyseq during each
quarter of the Project Year (based upon budgeted Research Funding for such
quarter of the Project Year as approved by the JRDC) within [***] after receipt
of Hyseq's invoice therefor, as submitted pursuant to Section 3.1.1; provided,
however, that, upon receipt of such invoice by Kirin, the Parties shall review
the amount of expenses submitted by Hyseq in such quarter and, in the event that
Hyseq's actual expenses are less than the budgeted Research Funding payment for
such quarter, Kirin shall only be required to pay the amount of actual expenses
incurred by Hyseq. Kirin shall not be obligated to make any payment to Hyseq
hereunder before the initial Project Year Commencement Date.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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               3.1.3 As provided under Sections 3.1.1 and 3.1.2, the Research
Work for which Kirin shall pay, and the associated Research Funding therefor,
for each Project Year shall be approved by the JRDC not later than ninety (90)
days prior to the start of each such Project Year. In the event that the
Research Funding for any Project Year has not been agreed upon in advance of the
start of such Project Year, the Responsible Executives of the Parties shall
meet, in person or by conference telephone call, to resolve the matter. Pending
such resolution, however, Kirin, at its sole discretion, may elect to fund the
FTE contributions of Hyseq for any upcoming Project Year, on a quarterly basis,
in amounts sufficient to continue any Research Work (or portions thereof) from
the corresponding just-ended Project Year, and Hyseq shall continue to perform
such ongoing Research Work (or portions thereof).

               3.1.4 Except as expressly provided in this Section 3.1, Hyseq
shall bear all costs and expenses incurred by Hyseq in performance of Research
Work under the R&D Plan.

               3.1.5 Upon Kirin's request, the JRDC shall provide to Kirin, on
or before October 1 of any calendar year, an estimated budget for all Research
Work to be performed by Hyseq during the subsequent calendar year.

        3.2 DEVELOPMENT FUNDING. The JRDC shall agree upon a budget to cover
both Parties' FTE contributions in performance of the Development Work during
each Project Year (such approved budget referred to herein as the "DEVELOPMENT
FUNDING"). The Parties shall share responsibility equally (i.e., on a 50/50
basis) for payment of the Development Funding, based on each Party's actual FTE
contributions to the Development Work and the FTE Rate. Within [***] after the
close of each quarter of a Project Year, each Party shall submit detailed and
accurate reports of its actual FTE contributions at the FTE Rate to the other
Party, and the Party reporting lower costs for such quarter shall reimburse the
other Party for one-half the difference between each Party's individual costs
within [***] after both parties submit their reports, provided that neither
Party shall be responsible for expenses incurred in a Project Year by the other
Party with respect to Development Work that was not approved by the JRDC or to
the extent that such expenses exceed such Party's allocated portion of the
budgeted amounts therefor. Unless otherwise provided by the JRDC in writing, any
other costs for the R&D Plan (e.g., third-party licenses and costs relating to
third-party contractors) shall be borne solely by the Party which incurred such
costs.

        3.3 NET SALES ROYALTY.

               3.3.1 Hyseq shall pay Kirin a royalty equal to [***] of Net Sales
billed or invoiced by Hyseq or its Affiliates or Sublicensees in the Hyseq
Territory.

               3.3.2 Kirin shall pay Hyseq a royalty equal to [***] of Net Sales
billed or invoiced by Kirin or its Affiliates or Sublicensees in the Kirin
Territory.

        3.4 ROYALTY PAYMENT TERMS.

               3.4.1 All royalty payments due and payable pursuant to Section
3.3 shall be made within [***] after the close of the calendar quarter in which
the applicable Net Sales were billed or invoiced. Each payment shall be
accompanied by a written statement setting forth in reasonable detail the Net
Sales in each country for each New Product, the rates of exchange (if
applicable), and the royalty calculation.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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               3.4.2 All royalty payments due and payable pursuant to Section
3.3 shall be made in United States Dollars. Each payment shall be made by wire
transfer to such financial institutions and account numbers as the other Party
may designate in writing. In the event that a Party (or its Affiliates or
Sublicensees) sells New Products in foreign currencies other than United States
Dollars, the royalties owed shall be calculated by such Party (or its Affiliates
or Sublicensees) in the foreign currency (and otherwise in accordance with such
Party's or its Affiliates' or Sublicensees' standard accounting procedures) by
converting the total amount of each foreign-currency royalty owed for the
applicable reporting period to United States Dollars at the exchange rate in the
United States (calculated by reference to the "United States Dollar noon buying
rates," or its equivalent, as published in the Wall Street Journal) in effect on
the last business day of the applicable reporting period.

               3.4.3 Each Party shall keep and maintain accurate books and
records to verify the number of units of New Products sold or otherwise disposed
of during a reporting period by such Party, its Affiliates and its Sublicensees,
and such other information as may be reasonably required to confirm the amounts
payable hereunder with respect to such reporting period. Each Party shall
preserve such books and records for a period of [***] after the end of the
period covered by such books and records, which obligation shall survive for
[***] after expiration or termination of this Agreement. Each Party (the
"AUDITING PARTY") shall have the right, on [***] advance written notice and not
more than [***] in any twelve (12) month period, to have an independent
accounting firm reasonably acceptable to the other Party (the "AUDITED PARTY")
examine such books, records and accounts of the Audited Party during the Audited
Party's normal business hours solely to verify the accuracy of the royalty
reports and the amount of payments made by the Audited Party hereunder during
the preceding [***] quarterly reporting periods. The accounting firm shall not
be paid on a contingency or other basis related to the outcome of the audit, and
shall execute a confidentiality agreement with the Audited Party in a form
mutually acceptable to the Parties that prohibits the accounting firm from
disclosing or using information obtained in connection with the audit other than
the disclosure to the Auditing Party of the amount of any underpayment or
overpayment. Any such audit shall be conducted during the Audited Party's
regular business hours, in such a manner so as not to interfere with the Audited
Party's normal business activities, and shall be at the Auditing Party's
expense, provided that if such audit reveals an underpayment of more than [***]
during any reporting period, the Audited Party shall pay the costs of the audit.

               3.4.4 Any deduction, withholding or similar taxes that a Party is
required by statute to withhold with respect to any royalty payment payable
hereunder shall be deducted from such payment; provided that the deducting Party
shall provide the other Party with a copy of the certificate or other
documentation demonstrating the payment to applicable tax authorities of the
deducted, withheld or taxed amount. Late payments shall be subject to interest
at a rate equal to [***] per annum or the maximum rate allowed by law, whichever
is less.

        3.5 ADDITIONAL TECHNOLOGY.

               3.5.1 During the term of this Agreement, if either Party becomes
aware of technology or related intellectual property rights relating to a New
Product that is held or otherwise controlled by a Third Party, and such Party
believes such technology and/or intellectual property rights are required to
make, use, sell, offer for sale or import such New Product ("ADDITIONAL
TECHNOLOGY") in any country within the Hyseq Territory, Kirin Territory or Other
Territory, as

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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applicable, such Party may present a description of such technology, along with
an analysis of the purported need for such technology, to the JRDC. Such Party
shall [***]. Upon the written approval of the JRDC, which approval shall not be
unreasonably withheld, such Party shall have the right to [***], provided that
in no event will [***].

               3.5.2 Notwithstanding anything to the contrary in this Section
3.5, this section shall not limit or otherwise restrict either Party in
procuring technology or intellectual property rights.

                                    ARTICLE 4

                               GRANTS OF LICENSES

        4.1 GRANT OF LICENSES BY HYSEQ TO KIRIN.

               4.1.1 Subject to the terms and conditions of this Agreement,
Hyseq hereby grants to Kirin and its Affiliates a non-exclusive right and
license, without a right to grant sublicenses, under the Hyseq Technology and
Hyseq Improvements, as follows: (a) worldwide, solely to conduct Kirin's
obligations to perform the R&D Work in accordance with the R&D Plan; (b) in the
Kirin Territory to make, use, sell, offer for sale and import New Products in
the Kirin Territory; and (c) in the Other Territory to make, use, sell, offer
for sale and import New Products in the Other Territory solely as directed by
the JRDC pursuant to Article 2.

               4.1.2 Subject to the terms and conditions of this Agreement and
upon designation of a Development Candidate by the JRDC, Hyseq grants to Kirin
and its Affiliates, on a Development Candidate-by-Development Candidate basis, a
worldwide co-exclusive right and license (i.e., exclusive except for Hyseq's
retention of all such rights for itself and its Affiliates and its
Sublicensees), under all Patent Rights of Hyseq that claim each Development
Candidate and are listed on Exhibit D, including without limitation, the Prior
Art Inventions, to make, use and import (and to have such rights exercised on
its or their behalf) Development Candidates for the limited purpose of
conducting the R&D Work in accordance with the R&D Plan, as directed by the JRDC
pursuant to Article 2. Kirin and its Affiliates shall have the right to grant
sublicenses under the foregoing license only upon the prior written consent of
Hyseq, which shall not be unreasonably withheld or delayed.

               4.1.3 Subject to the terms and conditions of this Agreement ,
Hyseq grants to Kirin and its Affiliates, on a New Product-by-New Product basis,
an exclusive right and license, under all Patent Rights of Hyseq that claim each
New Product and are listed on Exhibit D, to make, use, sell, offer for sale and
import New Products in the Kirin Territory and, solely as directed by the JRDC
pursuant to Article 2, in the Other Territory. Kirin and its Affiliates shall
have the right to grant sublicenses under the foregoing license only upon the
prior written consent of Hyseq, which shall not be unreasonably withheld or
delayed.

        4.2 GRANT OF LICENSES BY KIRIN TO HYSEQ.

               4.2.1 Subject to the terms and conditions of this Agreement,
Kirin hereby grants to Hyseq and its Affiliates a non-exclusive right and
license, without a right to grant sublicenses, under the Kirin Technology and
Kirin Improvements, as follows: (a) worldwide, solely to conduct

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       12

Hyseq's obligations to perform the R&D Work in accordance with the R&D Plan; (b)
in the Hyseq Territory to make, use, sell, offer for sale and import New
Products in the Hyseq Territory; and (c) in the Other Territory to make, use,
sell, offer for sale and import New Products in the Other Territory solely as
directed by the JRDC pursuant to Article 2.

               4.2.2 Subject to the terms and conditions of this Agreement and
upon designation of a Development Candidate by the JRDC, Kirin grants to Hyseq
and its Affiliates, on a Development Candidate-by-Development Candidate basis, a
worldwide co-exclusive right and license (i.e., exclusive except for Kirin's
retention of all such rights for itself and its Affiliates and its
Sublicensees), under all Patent Rights of Kirin that claim each Development
Candidate and are listed on Exhibit D, including without limitation, the Prior
Art Inventions, to make, use and import (and to have such rights exercised on
its or their behalf) Development Candidates for the limited purpose of
conducting the R&D Work in accordance with the R&D Plan, as directed by the JRDC
pursuant to Article 2. Hyseq and its Affiliates shall have the right to grant
sublicenses under the foregoing license only upon the prior written consent of
Kirin, which shall not be unreasonably withheld or delayed.

               4.2.3 Subject to the terms and conditions of this Agreement Kirin
grants to Hyseq and its Affiliates, on a New Product-by-New Product basis, an
exclusive right and license, under all Patent Rights of Kirin that claim each
New Product and are listed on Exhibit D, to make, use, sell, offer for sale and
import New Products in the Hyseq Territory and, solely as directed by the JRDC
pursuant to Article 2, in the Other Territory. Hyseq and its Affiliates shall
have the right to grant sublicenses under the foregoing license only upon the
prior written consent of Kirin, which shall not be unreasonably withheld or
delayed.

        4.3 NO OTHER RIGHTS. This Agreement confers no right, license or
interest by implication, estoppel or otherwise under any patents, patent
applications, know-how or other intellectual property rights of either Party
except as expressly set forth in this Article 4 and in Articles 5 and 8. Each
Party hereby expressly reserves all rights and interests with respect to
patents, patent applications, know-how or other intellectual property rights not
expressly granted to the other Party hereunder.

                                    ARTICLE 5

                          INTELLECTUAL PROPERTY MATTERS

        5.1 OWNERSHIP OF INTELLECTUAL PROPERTY.

               5.1.1 JOINT INVENTIONS; JOINT PATENTS; OTHER JOINT INVENTIONS.
Subject to the provisions of Section 5.1.6, the Parties shall jointly own all
Joint Inventions, Joint Patents and Other Joint Inventions. Unless otherwise
explicitly provided herein, neither Party shall have any right or obligation of
consent, accounting or payment of royalties or other consideration with respect
to such Party's commercialization or exploitation of any Joint Invention, Joint
Patent or Other Joint Inventions.

               5.1.2 ASSIGNMENT BY HYSEQ. In order to effect the joint ownership
provisions of Section 5.1.1, and subject to Section 5.1.6, Hyseq hereby assigns
and agrees to assign to Kirin a

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one-half undivided interest (and thereby retains an equal one-half undivided
interest) in, to and under: (a) any Joint Invention or Other Joint Invention
made solely by the employees, agents or contractors of Hyseq and its Affiliates;
and (b) all Patent Rights claiming such Joint Invention or Other Joint
Inventions.

               5.1.3 ASSIGNMENT BY KIRIN. In order to effect the joint ownership
provisions of Section 5.1.1, and subject to Section 5.1.6, Kirin hereby assigns
and agrees to assign to Hyseq a one-half undivided interest (and thereby retains
an equal one-half undivided interest) in, to and under: (a) any Joint Invention
or Other Joint Invention made solely by the employees, agents or contractors of
Kirin and its Affiliates; and (b) all Patent Rights claiming such Joint
Invention or Other Joint Invention.

               5.1.4 HYSEQ TECHNOLOGY; HYSEQ IMPROVEMENT. As between the
Parties, subject only to the licenses set forth in Article 4 and Article 8, and
the provisions of Section 5.1.6, Hyseq shall (a) retain all right, title and
interest in and to the Hyseq Technology, and (b) solely own (i) any Hyseq
Improvements (whether or not such Hyseq Improvements are invented, developed or
made solely by or with the contribution of the employees, agents or contractors
of Kirin) and (ii) all Patent Rights claiming, covering or directed to any such
Hyseq Improvements. To the extent necessary to implement the foregoing, Kirin
hereby assigns and agrees to assign to Hyseq all of Kirin's right, title and
interest in, to and under the Hyseq Improvements.

               5.1.5 KIRIN TECHNOLOGY; KIRIN IMPROVEMENT. As between the
Parties, subject only to the licenses set forth in Article 4 and Article 8, and
the provisions of Section 5.1.6, Kirin shall (a) retain all right, title and
interest in and to the Kirin Technology, and (b) solely own (i) any Kirin
Improvements (whether or not such Kirin Improvements are invented, developed or
made solely by or with the contribution of the employees, agents or contractors
of Hyseq) and (ii) all Patent Rights claiming, covering or directed to any such
Kirin Improvements. To the extent necessary to implement the foregoing, Hyseq
hereby assigns and agrees to assign to Kirin all of Hyseq's right, title and
interest in, to and under the Kirin Improvements.

               5.1.6 PRIOR ART INVENTIONS. Notwithstanding anything in this
Section 5.1 to the contrary, if only one Party or its Affiliates (the "FIRST
PARTY") owns subject matter that qualifies as prior art (as specifically
identified in 35 U.S.C. Section 102(e), (f) or (g)) with respect to any
Invention conceived, developed or reduced to practice by the employees, agents
or contractors of the other Party or its Affiliates (the "SECOND PARTY") or by
the Second Party and First Party in the course of performance of the R&D Work or
commercialization of a New Product, then the First Party shall own all right,
title and interest in, to and under such Invention, and all Patent Rights and
other intellectual property rights therein and thereunder, solely in the United
States (thereafter, a "PRIOR ART INVENTION"); provided, however, that the rights
to such Invention outside of the United States shall be as otherwise set forth
in this Agreement and shall be unaffected by this Section 5.1.6, provided
further that the Prior Art Invention shall not include Kirin Improvements and
Hyseq Improvements. In accordance with the foregoing, if, in the course of
making required disclosures of any Invention pursuant to this Agreement, or
preparing a United States patent application claiming, covering or directed to
any Invention, one Party becomes aware of any subject matter owned by either of
the Parties that qualifies as prior art (pursuant to 35 U.S.C. Section 102(e),
(f) or (g)) with respect to such Invention, such Party shall provide a detailed
written notice thereof to the other Party, and, following the other Party's
receipt of such notice, the Parties shall cooperate to execute all

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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instruments required to document the assignment of the Prior Art Invention
required by this Section 5.1.6. The Second Party hereby agrees to transfer and
assign to the First Party all of its right, title and interest in, to and under
any such Prior Art Invention, and all Patent Rights therein, thereto, and
thereunder, solely in the United States, provided, however that such Prior Art
Invention, and all Patent Rights therein, thereto, and thereunder, outside the
United States shall be jointly owned as otherwise set forth in this Agreement
and shall be unaffected by this Section 5.1.6. The prosecution and maintenance
of any Patent Rights in, to and under any Prior Art Inventions owned by the
First Party pursuant to this Section 5.1.6 shall be governed in accordance with
the provisions of Section 5.3.

               5.1.7 Each Party shall execute or cause to be executed any
assignments or other instruments and documents and provide such other reasonable
assistance and cooperation as may be reasonably necessary or appropriate to
implement the provisions of this Section 5.1 and the assignments hereunder,
including, without limitation, by executing agreements with each Party's
employees, agents and contractors sufficient to convey to such Party the rights
transferred in this Section 5.1.

        5.2 OWNERSHIP OF APPROVAL APPLICATIONS AND REGULATORY APPROVALS.

               5.2.1 Subject to the rights granted to or owned by Kirin
hereunder, including without limitation, the rights owned by Kirin set forth in
Section 5.2.3, Hyseq shall own all right, title and interest in all Approval
Applications necessary to obtain Regulatory Approvals for New Products, together
with any Regulatory Approvals obtained in connection therewith, filed with or
issued by a governmental authority for a country or territory within the Hyseq
Territory and, as directed by the JRDC pursuant to Section 2.1.3, the Other
Territory. Such Approval Applications, together with any Regulatory Approvals
obtained in connection therewith, shall be filed in Hyseq's name and owned by
Hyseq.

               5.2.2 Subject to the rights granted to or owned by Hyseq
hereunder, including without limitation, the rights owned by Hyseq set forth in
Section 5.2.3, Kirin shall own all right, title and interest in all Approval
Applications necessary to obtain Regulatory Approvals required for manufacture,
marketing and sale of New Products, together with any Regulatory Approval
obtained in connection therewith, filed with or issued by a governmental
authority for a country or territory within the Kirin Territory and, as directed
by the JRDC pursuant to Section 2.1.3, the Other Territory. Such Approval
Applications, together with any Regulatory Approvals obtained in connection
therewith, shall be filed in Kirin's name and owned by Kirin.

               5.2.3 Each Party shall provide to the other Party [***] any new
or pending Approval Application. Each Party shall [***], and shall [***]
regarding Approval Application strategy. Each Party shall keep the other Party
informed of the status of an Approval Application to the extent known by each
Party.

        5.3 PROSECUTION AND MAINTENANCE OF SOLELY OWNED PATENTS; ABANDONMENT.

               5.3.1 Each Party shall have the sole right to file, prosecute and
maintain such Party's solely owned Patent Rights claiming, covering or directed
to a Development Candidate or New Product and shall bear all Patent Costs
associated therewith. Such Party (the "PROSECUTING

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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PARTY") shall provide to the other Party [***]. The Prosecuting Party shall
[***] with respect to any patent within such Patent Rights, and shall [***]
regarding the patent prosecution strategy for such Patent Rights. The
Prosecuting Party agrees to keep the other Party informed of the course of
patent prosecution or other proceedings relating to such Patent Rights to the
extent known by Prosecuting Party.

               5.3.2 Notwithstanding Section 5.3.1, in the event a Prosecuting
Party (as defined in Section 5.3.1) elects, on a country-by-country basis, not
to file or not to continue to prosecute and thereby abandon an application for a
patent, or not to maintain and thereby abandon a patent that it has the first
right to file, prosecute or maintain under Section 5.3.1 and that claims, or
which is required to make, use, sell, offer for sale or import, a Development
Candidate or New Product in such country or jurisdiction, such Party shall
notify the other Party not less than [***] before any relevant deadline, and
thereafter such other Party shall have the right to pursue, in such country or
jurisdiction, at such other Party's expense and in such other Party's sole
discretion, prosecution of such patent application or maintenance of such issued
patent, provided that with respect to any patent application or patent licensed
to a Party by a Third Party, the other Party shall only have a right to pursue
prosecution or maintenance to the extent permitted in the applicable agreement
with such Third Party. The other Party shall [***] any Patent Costs associated
with the prosecution or maintenance of such patent application or patent [***].

        5.4 PROSECUTION AND MAINTENANCE OF JOINT PATENTS; ABANDONMENT. The JRDC
shall determine and implement a patent strategy with respect to all Joint
Inventions and Other Joint Inventions that may be patentable. With respect to
all Joint Inventions and Other Joint Inventions for which the JRDC determines
patent protection should be sought, the JRDC shall direct, and the Parties shall
cooperate in, the preparation, filing and prosecution of Joint Patents, and the
Parties shall discuss and agree on the content and form of relevant patent
applications and any other relevant matters before such applications are made.
Each Party shall consider in good faith any comments from the other regarding
steps to strengthen such Joint Patents.

               5.4.1 Unless otherwise directed by the JRDC, Hyseq shall be
considered the Lead Party (as further described in Section 5.4.4) for Joint
Patents within the Hyseq Territory.

               5.4.2 Unless otherwise directed by the JRDC, Kirin shall be
considered the Lead Party (as further described in Section 5.4.4) for Joint
Patents within the Kirin Territory.

               5.4.3 The JRDC shall assign either Hyseq or Kirin as the Lead
Party (as further described in Section 5.4.4) for Joint Patents within the Other
Territory (or any jurisdiction therein).

               5.4.4 Unless otherwise directed by the JRDC, the Lead Party shall
have the right to file, prosecute and maintain Joint Patents within the Hyseq
Territory, Kirin Territory and/or Other Territory, as applicable, and shall bear
all Patent Costs associated therewith. In the event that the Lead Party elects
not to prosecute or maintain a patent application or patent with respect to a
particular Joint Invention or particular country or jurisdiction, the Lead Party
shall provide [***] notice thereof and the other Party may elect to prosecute
and maintain such patent application or patent at its sole discretion and
expense, and all rights in such patent application or patent shall be assigned
to such other Party. Either Party may choose at any time not to continue to pay
any such Patent Costs with respect to a particular Joint Patent, and shall
thereafter [***] if the other Party

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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pays all such Patent Costs. Such [***] shall take place in a timely manner to
enable the [***] Party to meet any external requirement concerning prosecution
matters and paying Patent Costs. In the event that a Party elects, at any time,
not to participate in the preparation, filing and prosecution of any patent
application covering a Joint Invention, such Party shall provide reasonable
assistance to the other Party, at the sole expense of such other Party, with
respect to any activities reasonably determined by such other Party as necessary
to obtain patent protection for such Joint Invention.

        5.5 ENFORCEMENT OF PATENT RIGHTS.

               5.5.1 If any Patent Right within the Joint Patents, or any Patent
Right within either Party's solely owned Patent Rights claiming, covering or
directed to a Development Candidate or New Product that is subject to Section
5.3, is [***] infringed by a Third Party through the manufacture, use, sale,
offer for sale or importation of any product (an "INFRINGEMENT"), the Party
first having knowledge of such infringement shall promptly notify the other
Party in writing. Such notice shall set forth the facts of the Infringement in
reasonable detail.

               5.5.2 Hyseq shall have the first right, but not an obligation, to
institute, prosecute and control, using counsel of Hyseq's choice, any action or
proceeding with respect to an Infringement of a patent within the Joint Patents,
or its solely owned Patent Rights claiming, covering or directed to a
Development Candidate or New Product, in the Hyseq Territory and such Other
Territory as directed by the JRDC. If Hyseq initiates any such action or
proceeding, Kirin agrees [***]. In the event that Hyseq fails to institute an
action or proceeding with respect to such Infringement within a period of [***]
after notice of such Infringement, and fails thereafter to prosecute such action
or proceeding, Kirin shall have the right, but not the obligation, to institute
and/or prosecute and control an action or proceeding in its name with respect to
such an Infringement by counsel of Kirin's choice. In the event that Kirin
institutes any such action or proceeding, Hyseq agrees [***].

               5.5.3 Kirin shall have the first right, but not an obligation, to
institute, prosecute and control, using counsel of Kirin's choice, any action or
proceeding with respect to an Infringement, of a patent within the Joint
Patents, or its solely owned Patent Rights claiming, covering or directed to a
Development Candidate or New Product, in the Kirin Territory and such Other
Territory as directed by the JRDC. If Kirin initiates any such action or
proceeding, Hyseq agrees [***]. In the event that Kirin fails to institute and
an action or proceeding with respect to such Infringement within a period of
[***] after notice of such Infringement, and fails thereafter to prosecute such
action or proceeding, Hyseq shall have the right, but not the obligation, to
institute and/or prosecute and control an action or proceeding in its name with
respect to such an Infringement by counsel of Hyseq's choice. In the event that
Hyseq institutes any such action or proceeding, Kirin agrees [***].

               5.5.4 Any recovery obtained by a Party enforcing one or more
patents, in accordance with this Section 5.5 (the "ENFORCING PARTY"), whether by
judgment, award, decree or settlement, shall be [***]. Any remainder of the
recovery shall be [***].

        5.6 INFRINGEMENT OF THIRD PARTY RIGHTS.

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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               5.6.1 In the event that a Third Party alleges that intellectual
property rights owned, held or otherwise controlled by such Third Party are
being infringed or have been infringed by one or both Parties in connection with
the manufacture, use, sale, offer for sale or importation of a Development
Candidate or New Product in the Hyseq Territory, [***], any claim in any legal
action or proceeding arising from such allegation. The Parties shall consult
with each other concerning strategy, approaches and the consequences of
approaches that may be taken under this Section 5.6.1. Kirin shall [***].

               5.6.2 In the event that a Third Party alleges that intellectual
property rights owned, held or otherwise controlled by such Third Party are
being infringed or have been infringed by one or both Parties in connection with
the manufacture, use, sale, offer for sale or importation of a Development
Candidate or New Product in the Kirin Territory, [***]. The Parties shall
consult with each other concerning strategy, approaches and the consequences of
approaches that may be taken under this Section 5.6.2. Hyseq shall [***].

               5.6.3 In the event that a Third Party alleges that intellectual
property rights owned, held or otherwise controlled by such Third Party are
being infringed or have been infringed by one or both Parties in connection with
the manufacture, use, sale, offer for sale or importation of a Development
Candidate or New Product in the Other Territory, [***]. The Parties shall
consult with each other concerning strategy, approaches and the consequences of
approaches that may be taken under this Section 5.6.3. Unless otherwise agreed
upon by the Parties, the Parties shall [***] in connection with any such action
or proceeding. The Parties shall [***].

        5.7 SETTLEMENT WITH A THIRD PARTY. Except as expressly provided herein,
[***].

                                    ARTICLE 6

                         REPRESENTATIONS AND WARRANTIES

        6.1 REPRESENTATIONS AND WARRANTIES OF THE PARTIES CONCERNING CORPORATE
AUTHORIZATIONS. Each Party represents and warrants to the other Party that:

               (a)    Such Party is duly organized and validly existing and in
                      good standing under the laws of the jurisdiction of its
                      organization.

               (b)    Such Party has the full corporate power and is duly
                      authorized to enter into, execute and deliver this
                      Agreement, and to carry out and otherwise perform its
                      obligations hereunder.

               (c)    This Agreement has been duly authorized, executed and
                      delivered by such Party and constitutes a legal, valid and
                      binding obligation enforceable against it in accordance
                      with its terms subject, as to enforcement, to bankruptcy,
                      insolvency, reorganization and other laws of general
                      applicability relating to or affecting creditors' rights
                      and to the availability of particular remedies under
                      general equity principles.

               (d)    Such Party's execution, delivery and performance of this
                      Agreement and its compliance with the terms and conditions
                      hereof do not, and will not during

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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                      the term of this Agreement or any of its surviving
                      provisions conflict, with or result in a breach of any of
                      the terms and conditions of or constitute a default under
                      (i) any agreement where such conflict, breach or default
                      would impair in any material respect the ability of it to
                      perform its obligations or grant rights hereunder, (ii)
                      the provisions of its charter document or bylaws, or (iii)
                      any material law, rule, regulation or any order, writ,
                      injunction or decree of any court or governmental
                      authority entered against it or by which any of its
                      property is bound.

               (e)    As of the Effective Data, except for those actions, suits
                      and proceedings identified in each Party's publicly
                      available disclosures, including without limitation
                      disclosures required by the securities regulations
                      applicable to each Party, there are no actions, suits or
                      proceedings pending or threatened against it or its
                      Affiliates that may affect its ability to carry out its
                      obligations under this Agreement.

        6.2 RIGHT AND AUTHORITY TO GRANT LICENSES.

               6.2.1 As of the Effective Date, Hyseq represents and warrants to
Kirin that it has the right and authority to grant the rights and licenses
granted to Kirin and its Affiliates hereunder and is the sole and exclusive
owner of, or otherwise has the right to license, all intellectual property and
rights therein and thereto licensed to Kirin and its Affiliates hereunder.

               6.2.2 As of the Effective Date, Kirin represents and warrants to
Hyseq that it has the right and authority to grant the rights and licenses
granted to Hyseq and its Affiliates hereunder and is the sole and exclusive
owner of, or otherwise has the right to license, all intellectual property and
rights therein and thereto licensed to Hyseq and its Affiliates hereunder.

        6.3 [***] RESEARCH WORK. Unless otherwise agreed upon by the Parties in
writing, each Party hereby agrees that it shall not (and shall not permit any of
its Affiliates to), directly or indirectly, [***].

        6.4 NO [***] WARRANTY. Notwithstanding anything to the contrary herein,
nothing in this Agreement shall be deemed or construed as a representation or
warranty by either Party that any [***] of such Party is [***].

        6.5 DISCLAIMER. EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE
PARTIES MAKE NO, AND EXPRESSLY DISCLAIM ALL, REPRESENTATIONS OR WARRANTIES OF
ANY KIND WHATSOEVER, EITHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, INCLUDING,
WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE OR NON-INFRINGEMENT.

        6.6 LIMITATION OF LIABILITY. EXCEPT WITH RESPECT TO A BREACH OF EACH
PARTY'S OBLIGATIONS PURSUANT TO ARTICLE 7 AND WITH RESPECT TO LIABILITY ARISING
UNDER ARTICLE 9, NEITHER PARTY SHALL BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
CONSEQUENTIAL, PUNITIVE OR INDIRECT DAMAGES AS A RESULT OF ITS BREACH OF THIS
AGREEMENT, NO MATTER THE CAUSE OR THEORY

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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OF LIABILITY. THE FOREGOING LIMITATION SHALL APPLY EVEN IF THE OTHER PARTY HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE AND NOTWITHSTANDING ANY FAILURE
OF ESSENTIAL PURPOSE OF ANY LIMITED WARRANTY PROVIDED HEREIN.

                                    ARTICLE 7

                                 CONFIDENTIALITY

        7.1 CONFIDENTIALITY; EXCEPTIONS. Except as otherwise provided in this
Agreement, the Parties agree that, for the term of this Agreement and [***]
thereafter, all non-public, proprietary, or "confidential"-marked invention
disclosures, Inventions, know-how, data, and technical, financial and other
information of any nature whatsoever, including, without limitation, all
discussions and information exchanged or disclosed, in writing or through
observation, by one Party (the "DISCLOSING PARTY") to the other Party (the
"RECEIVING PARTY") hereunder (collectively, "CONFIDENTIAL INFORMATION") shall be
received and maintained by the Receiving Party in strict confidence, shall not
be used by the Receiving Party for any purpose other than the purposes expressly
permitted by this Agreement or for the purpose of exercising the Receiving
Party's rights and obligations under this Agreement, and shall not be disclosed
to any Third Party (including, without limitation, in connection with any
publications, presentations or other disclosures). Notwithstanding the
foregoing, the Receiving Party may, subject to the provisions of this Agreement,
disclose the Disclosing Party's Confidential Information to those of its and its
Affiliates' or Sublicensees' directors, officers, employees, agents, consultants
and clinical investigators that have a need to know such Confidential
Information to achieve the purposes of this Agreement, provided that such
Receiving Party shall ensure that its and its Affiliates' or Sublicensees'
directors, officers, employees, agents, consultants or clinical investigators to
whom disclosure is to be made are bound by the obligations of confidentiality
and non-disclosure and non-use no less stringent than those set forth herein.
Each Party shall promptly notify the other Party in writing upon discovery of
any unauthorized use or disclosure of the Confidential Information, and shall
describe the facts and circumstances of such use or disclosure. Except to the
extent expressly provided for in this Agreement, Confidential Information
belongs to and shall remain the property of the Disclosing Party. The provisions
of this Article 7 shall not apply to any information which can be shown by
contemporaneous written documentation by the Receiving Party:

               7.1.1 To have been known to or in the possession of the Receiving
Party prior to the date of its actual receipt from the Disclosing Party;

               7.1.2 To be or to have become readily available to the public
other than through any act or omission of the Receiving Party in breach of this
Agreement or any other agreement between the Parties;

               7.1.3 To have been disclosed to the Receiving Party, other than
under an obligation of confidentiality, by a Third Party which had no obligation
not to disclose such information to others; or

               7.1.4 To have been subsequently independently developed by the
Receiving Party without use of the Confidential Information as demonstrated by
competent written records.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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        7.2 AUTHORIZED DISCLOSURE. Notwithstanding anything to the contrary in
Section 7.1 of this Agreement, each Party shall have the right to disclose
Confidential Information hereunder solely to the extent such disclosure is
reasonably necessary in connection with submissions to any governmental
authority for the purposes of this Agreement or in filing or prosecuting patent
applications contemplated under this Agreement, [***] solely to the extent
required by law, complying with Applicable Laws, conducting R&D Work for the
purposes expressly permitted by this Agreement, or complying with applicable
securities laws and regulations; provided, however, that in the event of any
such anticipated disclosure of the Disclosing Party's Confidential Information
by the Receiving Party, the Receiving Party shall, except where impracticable,
give reasonable advance notice to the Disclosing Party of such disclosure
requirement (so that the Disclosing Party may seek a protective order and/or
other appropriate remedy or waive compliance with the confidentiality provisions
of this Article 7) and shall use its [***] efforts to secure confidential
treatment of such Confidential Information required to be disclosed.

        7.3 RETURN OF CONFIDENTIAL INFORMATION. The Receiving Party shall keep
Confidential Information belonging to the Disclosing Party in appropriately
secure locations. Upon the termination of this Agreement, any and all
Confidential Information possessed in tangible form by a Receiving Party, its
Affiliates or Sublicensees or its or any of their officers, directors,
employees, agents, consultants or clinical investigators and belonging to the
Disclosing Party, shall, upon written request, be immediately returned to the
Disclosing Party (or destroyed if so requested) and not retained by the
Receiving Party, its Affiliates or Sublicensees or any of their officers,
directors, employees, agents, consultants or clinical investigators, provided
that, in the event any rights or licenses survive the termination of this
Agreement pursuant to Article 8, each Party shall be entitled to retain any
Confidential Information of the other Party that is reasonably required to
exercise such rights and licenses for so long as such rights and licenses
survive. Notwithstanding the foregoing, each Party may retain one (1) copy of
any Confidential Information in an appropriately secure location for
record-keeping purposes.

                                    ARTICLE 8

                        TERM, TERMINATION AND ABANDONMENT

        8.1 TERM OF AGREEMENT. The term of this Agreement shall commence on the
Effective Date and continue for three (3) years after the Effective Date (the
"Term"), unless sooner terminated in accordance with this Article 8.
Notwithstanding the foregoing, if the JRDC fails to approve the initial R&D Plan
within one hundred eighty (180) days after the Effective Date, either Party may
terminate this Agreement at any time, effective upon delivery of notice thereof.

        8.2 TERMINATION FOR CAUSE.

               8.2.1 If either Party commits a material breach of this Agreement
at any time, which breach is not cured within [***] after written notice from
the non-breaching Party specifying the breach, the non-breaching Party shall
have the right to terminate this Agreement by written notice. The Parties
acknowledge and agree that failure to exercise any right or option, or to take
any action expressly within the discretion of a Party, shall not be deemed to be
a material breach by the Party with such right, option or discretion.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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               8.2.2 Each Party shall have the right to terminate this Agreement
if there is a Change of Control of the other Party.

        8.3 TERMINATION FOR INSOLVENCY. Either Party may terminate this
Agreement upon written notice to the other Party on or after the occurrence of
any of the following events: (a) the appointment of a trustee, receiver or
custodian for all or substantially all of the property of the other Party, or
for any lesser portion of such property, if the result materially and adversely
affects the ability of the other Party to fulfill its obligations hereunder,
which appointment is not dismissed within sixty (60) days, (b) the determination
by a court or tribunal of competent jurisdiction that the other Party is
insolvent such that such other Party's liabilities exceed the fair market value
of its assets, (c) the filing of a petition for relief in bankruptcy by the
other Party on its own behalf, or the filing of any such petition against the
other Party if the proceeding is not dismissed or withdrawn within sixty (60)
days thereafter, (d) an assignment by the other Party for the benefit of
creditors, or (e) the dissolution or liquidation of, or cessation of business in
the ordinary course by, the other Party.

        8.4 EFFECT OF TERMINATION; SURVIVAL.

               8.4.1 Upon termination or expiration of this Agreement, all of
the Parties' rights and obligations hereunder shall terminate, except as
provided in this Article 8.

               8.4.2 Except as provided in Section 8.4.3, upon termination or
expiration of this Agreement, if one or more New Products exists, then, for so
long as such one or both Parties or its Affiliates (or their Sublicensees)
continues to market and sell such New Products the following Sections shall
survive in addition to those set forth in Section 8.5: (a) Sections 2.2.2, 3.3,
3.4, 3.5, 4.1.1(b), 4.2.1(b), 4.1.3, 4.2.3, 6.1 and 6.2 shall remain in effect
until the earlier of (i) the last to expire of the Patent Rights claiming,
covering or directed to such New Products or (ii) the termination for cause,
pursuant to Section 8.2, of such surviving rights and obligations by either
Party; and (b) Sections 2.1.2, 2.1.3 and 2.1.4 shall survive solely to the
extent and for so long as necessary for the JRDC (or any approved subcommittee
thereof) to oversee the Parties' development and commercialization activities
with respect to one or more New Products.

               8.4.3 In the event a Party terminates this Agreement pursuant to
Section 8.2 or Section 8.3, (a) all licenses and rights granted to the other
Party pursuant to Article 4 shall terminate, and (b) the terminating Party shall
have an exclusive option to acquire (i) a worldwide, non-exclusive right and
license, without a right to grant sublicenses, under Hyseq Technology and Hyseq
Improvements or Kirin Technology and Kirin Improvements, as applicable, to
conduct research and development of Development Candidates and to make, have
made, use, sell, offer for sale and import any products resulting therefrom, and
(ii) a worldwide, royalty-bearing, exclusive right and license under all Patent
Rights of the other Party claiming, covering or directed to Development
Candidates, with a right to grant sublicenses, to make, use and evaluate such
Development Candidates and to make, have made, use, sell, offer for sale and
import any products resulting from such Development Candidates. The Party
entitled to exercise the foregoing option may do so only by providing written
notification thereof to the other Party at any time within a [***] period
commencing on the date of the other Party's written notice of termination of
this Agreement. Upon the exercise of the foregoing option, the Parties shall
negotiate [***] to establish

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       22

promptly a separate agreement formalizing the specific terms and conditions of
the foregoing license on [***] terms.

        8.5 SURVIVAL. Articles 1, 5, 7 (to the extent provided therein), 9, 10
and 11 and Sections 4.1.1(c) (to the extent limited by, if at all, Sections
8.4.3, 8.7.1, 8.7.2 and 8.7.3), 4.2.1(c) (to extent limited by, if at all,
Sections 8.4.3, 8.7.1, 8.7.2 and 8.7.3), 4.3, 5.1.6, 6.4, 6.5, 6.6, 8.4, 8.5 and
8.6 shall survive any termination or expiration of this Agreement.

        8.6 ACCRUED RIGHTS. Termination or expiration of this Agreement for any
reason shall be without prejudice to any rights which shall have accrued to the
benefit of either Party prior to such termination or expiration, including
damages arising from any breach under this Agreement. Such termination or
expiration shall not relieve either Party from obligations which are expressly
indicated to survive termination or expiration of this Agreement.

        8.7 ABANDONMENT OF R&D WORK OR NEW PRODUCTS.

               8.7.1 Either Party shall have the right, upon not less than [***]
prior written notice to the other Party, to elect to abandon all of the R&D Work
with respect to one or more Development Candidates. In the event a Party so
elects to abandon its obligations with respect to any Development Candidate, or
if a Party fails to perform its obligations under Sections 2.2.1 or 2.2.2 for a
period of [***], then (a) all licenses and rights granted to the abandoning
Party pursuant to Sections 4.1.1, 4.1.2 and 4.1.3 or Sections 4.2.1, 4.2.2 and
4.2.3, as applicable, with respect to such Development Candidate shall
terminate, and (b) the other Party shall have an exclusive option to acquire (i)
a worldwide, non-exclusive right and license, without a right to grant
sublicenses, under Hyseq Technology and Hyseq Improvements or Kirin Technology
and Kirin Improvements, as applicable, to conduct research and development of
such Development Candidate and to make, have made, use, sell, offer for sale and
import any products resulting therefrom, and (ii) a worldwide, royalty-bearing,
exclusive right and license under all Patent Rights of the abandoning Party
claiming, covering or directed to such Development Candidate, with a right to
grant sublicenses, to make, use and evaluate such Development Candidate and to
make, have made, use, sell, offer for sale and import any products resulting
from such Development Candidate. The Party entitled to exercise the foregoing
option may do so only by providing written notification thereof to the other
Party at any time within a [***] period commencing on the date of the other
Party's written notice of abandonment of such Development Candidate, after which
such option shall expire. Upon the exercise of the foregoing option, the Parties
shall negotiate [***] to establish promptly a separate agreement formalizing the
specific terms and conditions of the foregoing license on [***] terms.

               8.7.2 Either Party shall have the right, upon not less than [***]
prior written notice to the other Party, to elect to abandon substantially all
efforts to promote, market and sell one or more New Products in the Hyseq
Territory, Kirin Territory or Other Territory, as applicable (or within any
jurisdiction therein). In the event a Party so elects to abandon its obligations
with respect to any New Product, or if a Party fails to perform its obligations
under Section 2.2.2 for a period of [***], (a) all licenses and rights granted
to the abandoning Party pursuant to Sections 4.1.1, 4.1.2 and 4.1.3 or Section
4.2.1, 4.2.2 and 4.2.3, as applicable, with respect to such New Product shall
terminate, and (b) the other Party shall have an exclusive option to acquire (i)
a worldwide, non-exclusive right and license, without a right to grant
sublicenses, under Hyseq Technology and

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       23

Hyseq Improvements or Kirin Technology and Kirin Improvements, as applicable, to
make, have made, use, sell, offer for sale and import such New Product and (ii)
a worldwide, royalty-bearing, exclusive right and license under all Patent
Rights of the abandoning Party claiming, covering or directed to such New
Product, with a right to grant sublicenses, to make, have made, use, sell, offer
for sale and import such New Product. The Party entitled to exercise the
foregoing option may do so only by providing written notification thereof to the
other Party at any time within a [***] period commencing on the date of the
other Party's written notice of abandonment of such New Product, after which
such option shall expire. Upon the exercise of the foregoing option, the Parties
shall negotiate [***] to establish promptly a separate agreement formalizing the
specific terms and conditions of the foregoing license on [***] terms.

               8.7.3 In the event that the JRDC fails to approve all Development
Work with respect to a Development Candidate (which had previously been the
subject of Research Work, and became a Development Candidate pursuant to Section
2.1.3(j) and for which Development Work has not been conducted), and such
failure is the consequence of one (1) Party's failure to vote in favor of such
Development Work, then: (a) all licenses and rights granted to each Party
pursuant to Section 4.1, 4.2 or 4.3, as applicable, with respect to such
Development Candidate shall terminate, and (b) the other Party shall have an
exclusive option to acquire (i) a worldwide, non-exclusive right and license,
without a right to grant sublicenses, under Hyseq Technology, or Hyseq's
interests in Patent Rights and other intellectual property rights covering Hyseq
Improvements and/or Prior Art Inventions, or Kirin Technology, or Kirin's
interests in Patent Rights and other intellectual property covering Kirin
Improvements or Prior Art Inventions, to conduct research and development of
such Development Candidate and to make, have made, use, sell, offer for sale and
import any products resulting therefrom, and (ii) a worldwide, royalty-bearing,
exclusive right and license under all Patent Rights or other intellectual
property rights of Hyseq or Kirin, as applicable, covering Joint Inventions,
with a right to grant sublicenses, to make, use and evaluate such Development
Candidate and to make, have made, use, sell, offer for sale and import any
products resulting from such Development Candidate. To exercise the foregoing
option, the Party with such option shall provide written notification thereof to
the other Party at any time within a [***] period commencing on the date of the
other Party's most recent failure to approve such Development Candidate for
Development Work, after which time period such option shall expire. Upon the
exercise of the foregoing option, the Parties shall negotiate [***] to establish
promptly a separate agreement formalizing the specific terms and conditions of
the foregoing license on [***] terms.

                                    ARTICLE 9

                                 INDEMNIFICATION

        9.1 INDEMNIFICATION BY HYSEQ. Hyseq shall defend and indemnify Kirin and
its Affiliates, and its and their respective directors, officers, employees and
agents (collectively, the "KIRIN INDEMNIFIED PARTIES"), against all claims,
damages, liabilities, losses, costs and expenses arising out of any suit, action
or proceeding brought against any Kirin Indemnified Party by a Third Party
(collectively, "KIRIN CLAIMS") if and to the extent arising from (a) a breach by
Hyseq of any of its representations and warranties set forth in Sections 6.1 or
6.2, or (b) any gross negligence or willful acts or omissions of Hyseq or any of
its employees or agents in connection with the performance of any
responsibilities to be performed by Hyseq under this Agreement, including
without limitation the R&D Work, or (c) the manufacture, use or sale of a
Development Candidate or New Product by

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       24

Hyseq or its Affiliates or Sublicensees, or (d) any tax, interest, penalty or
associated expense owed by Hyseq or its Affiliates or imposed on or related to
any amounts received by Hyseq or its Affiliates, except in each case to the
extent any such Kirin Claim is subject to indemnification by Kirin pursuant to
Section 9.2.

        9.2 INDEMNIFICATION BY KIRIN. Kirin shall defend and indemnify Hyseq and
its Affiliates, and its and their respective directors, officers, employees and
agents (collectively, the "HYSEQ INDEMNIFIED PARTIES"), against all claims,
damages, liabilities, losses, costs and expenses arising out of any suit, action
or proceeding brought against any Hyseq Indemnified Party by a Third Party
(collectively, "HYSEQ CLAIMS") if and to the extent arising from (a) a breach by
Kirin of any of its representations and warranties set forth in Sections 6.1 or
6.2, or (b) any gross negligence or willful acts or omissions of Kirin or its
employees or agents in connection with the performance of any responsibilities
to be performed by Kirin under this Agreement, including without limitation the
R&D Work, or (c) the manufacture, use or sale of a Development Candidate or New
Product by Kirin or its Affiliates or Sublicensees, or (d) any tax, interest,
penalty or associated expense owed by Kirin or its Affiliates or imposed on or
related to any amounts received by Kirin or its Affiliates, except in each case
to the extent any such Hyseq Claim is subject to indemnification by Hyseq
pursuant to Section 9.1.

        9.3 PROCEDURE. Any Kirin Indemnified Party or Hyseq Indemnified Party
(each, an "INDEMNIFIED PARTY") shall give prompt written notice to the other
Party (the "INDEMNIFYING PARTY") of any Kirin Claim or Hyseq Claim, as
applicable, with respect to which indemnification may be required under this
Article 9, provided that failure to give such notice shall not impair the
obligation of the Indemnifying Party to provide indemnification hereunder except
if and to the extent that failure materially impairs the ability of the
Indemnifying Party successfully to defend such claim. The Indemnifying Party
shall be entitled to assume the defense and control of any Kirin Claim or Hyseq
Claim, as applicable, at its own cost and expense, provided that the Indemnified
Party shall have the right to be represented by its own counsel at its own cost
in such matters. The Indemnified Party shall provide all reasonable assistance
to the Indemnifying Party, at the Indemnifying Party's expense, in connection
with the defense of any claim hereunder. In the event the Indemnifying Party
declines to assume control of any Kirin Claim or Hyseq Claim, as applicable, the
Indemnified Party may assume such control the defense and settlement of such
claim at the sole cost and expense of the Indemnifying Party. The Indemnifying
Party shall not settle or dispose of any Kirin Claim or Hyseq Claim, as
applicable, [***] the Indemnified Party without [***].

                                   ARTICLE 10

                        GOVERNING LAW; DISPUTE RESOLUTION

        10.1 GOVERNING LAW. This Agreement shall be governed by and construed
under the laws of the State of California, without reference to or application
of its conflicts of laws rules or principles.

        10.2 DISPUTE RESOLUTION. The Parties are unable to resolve informally
any dispute arising out of or relating to this Agreement ("Dispute"), either
Hyseq or Kirin, by written notice to

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       25

the other, may have such Dispute referred to their respective executive officers
designated for attempted resolution by good faith negotiations (each, a
"Responsible Executive").

               FOR KIRIN:          President of Pharmaceutical Division

               FOR HYSEQ:          Chairman

        Any such Dispute shall be submitted to the Responsible Executives no
later than thirty (30) days following such request by either Hyseq or Kirin. All
negotiations pursuant to this Section 10.2 shall be treated as confidential
compromise and settlement negotiations. Nothing said or disclosed, nor any
document produced, in the course of such negotiations which is not otherwise
independently discoverable shall be disclosed to any Third Party nor offered or
received as evidence or used for impeachment or for any other purpose in any
current or future arbitration or litigation.

        10.3 ARBITRATION. In the event the Parties are not able to resolve a
Dispute within sixty (60) days after submission of the dispute to the
Responsible Executives pursuant to Section 10.2, such Dispute shall be settled
by arbitration; provided, however, that claims for injunctions and other
equitable relief shall be submitted to a court of competent jurisdiction; and
provided further that actions relating to the infringement, validity or
enforceability of any intellectual property right, including without limitation
a Patent Right, of either Party shall be submitted to a court of competent
jurisdiction in the country or territory in which such intellectual property
right exists or issued. In the case of Hyseq as the claimant in such
arbitration, such arbitration shall be held in Tokyo, Japan in accordance with
the Commercial Arbitration Rules of the Japan Commercial Arbitration
Association. In the case of Kirin as the claimant in such arbitration, such
arbitration shall be held in San Francisco, U.S.A., in accordance with the
Commercial Arbitration Rules of the American Arbitration Association. Judgment
upon the award rendered by such arbitration may be entered in any court having
jurisdiction over the party against which such award was rendered. Such
arbitration shall be conducted in the English language. The arbitrators shall
include one nominee of Hyseq and one nominee of Kirin and a third person
selected by said nominees. The Parties agree that any arbitration panel shall
include members knowledgeable as to evaluation of biopharmaceutical technology.
The prevailing Party shall be entitled to reasonable attorneys' fees and costs
to be fixed by the arbitrators.

        10.4 EXCLUSIVE DISPUTE RESOLUTION PROCEDURES. The Parties agree that the
procedures set forth in this Article 10 shall be the exclusive means of
resolving any and all Disputes between the Parties.

                                   ARTICLE 11

                                  MISCELLANEOUS

        11.1 ASSIGNMENT.

               11.1.1 Neither Party may assign or otherwise transfer its rights
or obligations under this Agreement without the prior written consent of the
other Party, such consent not to be unreasonably withheld, except that a Party
may assign or otherwise transfer its rights or obligations in whole or in part
without such consent, upon thirty (30) days prior written notice to the other
Party, (a) to an Affiliate of such Party, provided that no such assignment shall
relieve any Party as

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       26

the primary obligor hereunder, or (b) to a Third Party in connection with the
merger, consolidation, or sale of substantially all of the assets of the
assigning Party, or reorganization affecting substantially all of the assets or
voting control of the assigning Party, with respect to the subject matter of
this Agreement.

               11.1.2 This Agreement shall be binding upon and inure to the
benefit of the successors and permitted assigns of the Parties. Any assignment
not in accordance with this Agreement shall be void.

        11.2 FORCE MAJEURE. Neither Party shall lose any rights hereunder or be
liable to the other Party for damages or losses on account of failure of
performance by the defaulting Party to the extent the failure is occasioned by
government action, war, fire, explosion, flood, strike, lockout, embargo, act of
God, or any other similar cause beyond the control of the defaulting Party,
provided that the Party claiming force majeure shall promptly notify the other
Party in writing setting forth the nature of such force majeure, shall use its
best efforts to eliminate, remedy or overcome such force majeure and shall
resume performance of its obligations hereunder as soon as reasonably
practicable after such force majeure ceases. Except as provided in the previous
sentence, if any force majeure continues for more than one hundred eighty (180)
days, the other Party may terminate this Agreement in part, on a
country-by-country basis, or in whole, if all countries are affected, upon
written notice to the affected Party.

        11.3 FURTHER ACTIONS. Each Party agrees to execute, acknowledge and
deliver such further instruments, and to do all such other acts, as may be
necessary in order to carry out the express provisions of this Agreement.

        11.4 GOVERNMENTAL APPROVALS; COMPLIANCE WITH LAW. Parties shall make all
filings with governmental authorities as shall be required by Applicable Laws in
connection with this Agreement and the activities contemplated hereunder or
thereunder. In fulfilling its obligations under this Agreement each Party agrees
to comply in all material respects with all Applicable Laws.

        11.5 PUBLIC ANNOUNCEMENT. No announcement, news release, public
statement, publication or presentation relating to the existence of this
Agreement, or the terms hereof, shall be made without the other Party's prior
written approval; provided, however, that, subject to the provisions of Section
7.2, each Party shall have the right to make such disclosures as are required by
applicable law, including without limitation the securities regulations
applicable to each Party. Each Party agrees that it shall not publish or present
the results of the R&D Work (including any and all Inventions resulting
therefrom) carried out pursuant to this Agreement without the opportunity for
prior review by the other Party. Each Party shall provide the other Party an
opportunity to review any proposed abstract, manuscript or presentation
(including information to be presented orally) at least [***] prior to its
intended submission for publication, and each Party agrees, upon written request
from the other Party, not to submit such abstract or manuscript to any
publication, or to deliver such presentation, until the other Party has had a
reasonable opportunity and amount of time to review such publication or
presentation for its Confidential Information and to either: (i) secure patent
protection for any material in such publication or presentation that it believes
is patentable; or (ii) redact from the proposed abstract or manuscript the
Confidential Information of such reviewing Party, which redacted material shall
not be disclosed to any Third Party.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       27

        11.6 NOTICES. All notices required or permitted to be given under this
Agreement shall be deemed given if delivered personally or by facsimile
transmission receipt verified, mailed by registered or certified mail return
receipt requested, postage prepaid, or sent by express courier service, to the
Parties at the following addresses, or at such other address for a Party as
shall be specified by like notice, provided that notices of a change of address
shall be effective only upon receipt thereof.

               IF TO HYSEQ:           HYSEQ, INC.
                                      670 Almanor Avenue
                                      Sunnyvale, California  94085
                                      Attention: Legal Department
                                      Telephone: 408-524-8100
                                      Facsimile: 408-524-8145

               IF TO KIRIN:           KIRIN BREWERY COMPANY, LTD.
                                      26-1, Jingumae 6-chome
                                      Shibuya-ku
                                      Tokyo 150-8011, Japan
                                      Attention: Licensing Department
                                      Telephone: 81-3-5485-6206
                                      Facsimile: 81-3-5485-6765

        The date of receipt of any notice given under this Agreement shall be
deemed to be the date given if delivered personally or by facsimile transmission
receipt verified, seven (7) days after the date mailed if mailed by registered
or certified mail return receipt requested, postage prepaid, and two (2) days
after the date sent if sent by express courier service.

        11.7 WAIVER. No failure of either Party to exercise and no delay in
exercising any right, power or remedy in connection with this Agreement (each, a
"RIGHT") shall operate as a waiver thereof, nor shall any single or partial
exercise of any Right preclude any other or further exercise of such Right or
the exercise of any other Right. To be effective, the waiver of any Right must
be set forth in a writing signed by both Parties.

        11.8 DISCLAIMER OF AGENCY. The relationship between the Parties
established by this Agreement is that of independent contractors, and nothing
contained herein shall be construed to (a) give either Party the power to direct
or control the day-to-day activities of the other, (b) constitute the Parties as
the legal representative or agent of the other Party or as partners, joint
venturers, co-owners or otherwise as participants in a joint or common
undertaking, or (c) allow either Party to bind the other Party or to create or
assume any liability or obligation of any kind, express or implied, against or
in the name of or on behalf of the other Party for any purpose whatsoever,
except as expressly set forth in this Agreement.

        11.9 SEVERABILITY. If any term, covenant or condition of this Agreement
or the application thereof to any Party or circumstance shall, to any extent, be
held to be invalid or unenforceable by a court or administrative agency of
competent jurisdiction, then (a) the remainder of this Agreement, or the
application of such term, covenant or condition to any Party or circumstance
other than those as to which it is held invalid or unenforceable, shall not be
affected

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       28

thereby and each term, covenant or condition of such documents shall be valid
and be enforced to the fullest extent permitted by law, and (b) the Parties
hereto covenant and agree to renegotiate any such term, covenant or application
thereof in good faith in order to provide a reasonably acceptable alternative to
the term, covenant or condition of such documents or the application thereof
that is invalid or unenforceable, it being the intent of the Parties that the
basic purposes of this Agreement are to be effectuated.

        11.10 NATURE OF AGREEMENT. The rights and licenses granted under this
Agreement are, for purposes of Section 365(n) of the U.S. Bankruptcy Code (the
"BANKRUPTCY CODE"), licenses of "intellectual property" within the scope of
Section 101 of the Bankruptcy Code. The Parties agree that each Party, as a
licensee of such rights and licenses, shall retain and may fully exercise all of
its rights and elections under the Bankruptcy Code. The Parties further agree
that, in the event of the commencement of a bankruptcy or insolvency proceeding
by or against a Party, the other Party shall be entitled to a complete duplicate
of (and complete access to) any such intellectual property and embodiments
thereof. If not already in the other Party's possession, such other Party shall
have the right to immediate delivery of such intellectual property and
embodiments upon written request.

        11.11 ENTIRE AGREEMENT. Except for the rights and obligations that
survive the expiration of the certain Collaboration and License Agreement, dated
as of November 10, 1998, between the Parties, this Agreement and Exhibits hereto
set forth all covenants, promises, agreements, warranties, representations,
conditions and understandings between the Parties hereto and supersedes and
terminates all prior and contemporaneous agreements and understandings between
the Parties. There are no covenants, promises, agreements, warranties,
representations, conditions or understandings, either oral or written, between
the Parties other than as set forth herein or therein. No subsequent alteration,
amendment, change or addition to this Agreement and Exhibits hereto shall be
binding upon the Parties hereto unless reduced to writing and signed by the
respective authorized officers of the Parties.

        11.12 COUNTERPARTS. This Agreement may be executed in counterparts, each
of which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

        IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
duly executed on the date below written.

   HYSEQ, INC.                              KIRIN BREWERY COMPANY, LTD.

   By /s/ Ted Love                          By /s/ Katsuhiko Asano
     --------------------------------         ------------------------------

   Typed Name         Ted Love              Typed Name  Katsuhiko Asano
              -----------------------                 ----------------------

   Title  Chief Executive Officer           Title President, Pharmaceuticals
        -----------------------------             Division
                                                 ---------------------------

        Date     8/14/01                         Date    8/28/02
            ------------------------------           ---------------------------

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       29

                                    EXHIBIT A

                                 HYSEQ TERRITORY

    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    United States

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       30

                                    EXHIBIT B

                                 KIRIN TERRITORY

    [***]
    Australia
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    Japan
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    New Zealand
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]
    [***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       31

                                    EXHIBIT C

                       SUBJECT MATTER FOR INITIAL R&D PLAN

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       32

Kirin/Hyseq

Workplan/Timeline/Budget

[***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       33

                                    EXHIBIT D

                                  PATENT RIGHTS

                THAT CLAIM A DEVELOPMENT CANDIDATE OR NEW PRODUCT

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       34

                                                                   EXHIBIT 10.18

                                SECRETED PROTEIN
                    DEVELOPMENT AND COLLABORATION AGREEMENT

        THIS SECRETED PROTEIN DEVELOPMENT AND COLLABORATION AGREEMENT (this
"Agreement") is entered into and made on October 9, 2001 (the "Effective Date")
by and between DELTAGEN, INC. ("DELTAGEN"), a corporation organized and existing
under the laws of the state of Delaware and having a principal place of business
at 1003 Hamilton Avenue, Menlo Park, California 94025 and HYSEQ, INC. ("HYSEQ")
a corporation incorporated and existing under the laws of the state of Nevada
having a principal place of business at 670 Almanor Avenue, Sunnyvale,
California 94085-3513. DELTAGEN and HYSEQ are both referred to herein as
"Parties" or each individually, as a "Party."

                                    RECITALS

        WHEREAS, HYSEQ is in the business of applying its proprietary genomics
platform and utilizing its proprietary sequencing-by-hybridization technology to
find and develop biopharmaceuticals products and has discovered and identified
genes encoding for secreted proteins that may have potential as therapeutic
proteins; and

        WHEREAS, DELTAGEN possesses certain knowledge and experience in the
design, generation, and phenotypic analysis of transgenic animals, including
knock-out mice and has technologies useful in determining the in vivo function
of mammalian genes; and

        WHEREAS, HYSEQ and DELTAGEN each desire, on the terms and conditions
contained herein, to collaborate on the discovery, research, development and
commercialization of biopharmaceutical products through the analysis and study
of human gene sequences provided by HYSEQ; and

        WHEREAS, in connection with this collaboration, HYSEQ will contribute,
in accordance with the terms and conditions of this Agreement, human gene
sequences and a corresponding murine ortholog sequence sufficient for the
Steering Committee to designate [***] Project Genes to the collaboration and
will grant licenses covering such genes and related technology and derivatives
thereof; and

        WHEREAS, DELTAGEN will, in accordance with the terms and conditions of
this Agreement, create ES cell lines and generate knock-out mice based on [***]
Project Genes and

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
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AMENDED.

their orthologous murine gene sequences, as identified by HYSEQ, and DELTAGEN
will study and analyze such knock-out mice to identify secreted proteins for
further development and commercialization by the Parties; and

        WHEREAS, the Parties shall undertake research and development programs
as determined by the Parties on the terms and conditions set forth in this
Agreement.

        NOW, THEREFORE, in consideration of the mutual covenants contained
herein, and for other good and valuable consideration, the amount and
sufficiency of which are hereby acknowledged, the Parties hereby agree as
follows:

                                    ARTICLE 1
                                   DEFINITIONS

        1.1 "ADDITIONAL TESTS" shall have the meaning set forth in Section
5.4.1.

        1.2 "AFFILIATE" means at the time of determination any Person which
directly or indirectly is controlled by, controls or is under common control
with any Party hereto. "Control" shall in this context mean ownership of greater
than [***] of the voting stock or other interests in the Person in question. In
any country of the Territory in which local law prohibits the ownership by
DELTAGEN or HYSEQ of greater than [***] of the voting stock or other interests
of an entity, the entity shall be deemed an Affiliate of DELTAGEN or HYSEQ, as
applicable, if DELTAGEN or HYSEQ owns the maximum percentage permitted by law,
[***].

        1.3 "AGENCY" means any governmental regulatory authority responsible for
granting approvals for the sale of a product.

        1.4 "DELTABASE" means DELTAGEN's functional genomics database and
software.

        1.5 "DELTAGEN KNOCK-OUT TECHNOLOGY" means all Technical Information that
is owned or controlled by DELTAGEN as of the Effective Date or developed solely
by DELTAGEN during the Term of this Agreement relating to any methods of making,
generating, producing, creating, breeding and/or analyzing transgenic animals,
including Knockout Mice, or libraries, clones, plasmids, constructs and vectors
used in such methods (including [***]).

        1.6 "DERIVATIVE PROTEIN" means (i) any fragment of a [***], or (ii) any
altered form of a [***] or a fragment thereof, including [***]

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       2

        1.7 "DERIVED" OR "DERIVED" means obtained, developed, created, tested,
identified, discovered, synthesized, designed, derived or resulting from, based
upon or otherwise generated (whether directly or indirectly, or in whole or in
part), and anything so derived shall be referred to herein as "derivatives."

        1.8 "DEVELOPMENT PROGRAM" shall have the meaning set forth in Section
3.1.

        1.9 "FIRST PASS PHENOTYPIC ANALYSIS" means the tests, observations, and
analyses listed on Exhibit A.

        1.10 "FTE" means the equivalent of one person with at least a bachelor's
degree providing scientific, pre-clinical, clinical trial, or regulatory work on
a full-time basis (i.e., no less than a total of [***] hours per calendar year,
prorated in the case of a partial calendar year). Any FTE charge for the FTEs
dedicated to the applicable matter shall be the number of hours each FTE of a
Party directly spent on the applicable matter billed at a rate equal to [***]
for such FTE, but not exceeding [***] per calendar year, which rate includes
[***].

        1.11 "HYSEQ KNOW-HOW" means any and all Technical Information that is
solely owned or controlled by HYSEQ as of the Effective Date or developed solely
by HYSEQ during the Term of this Agreement that relates to any Proposed Gene or
any Project Gene, as applicable, or any mutation, fragment, allelic variant,
analog, homolog or ortholog of any Proposed Gene or Project Gene, as applicable,
and/or any expression products and/or derivatives thereof.

        1.12 "HYSEQ PATENTS" means all Patents in any country in the Territory
that are solely owned or controlled by HYSEQ as of the Effective Date or
developed solely by HYSEQ during the Term that relate to any Proposed Gene or
any Project Gene, as applicable, or any mutation, fragment, allelic variant,
analog, homolog or ortholog of any Proposed Gene or any Project Gene, as
applicable, and/or any expression products and/or derivatives thereof,

        1.13 "INITIAL MURINE GENE ANALYSIS" means the conduct of studies and
analysis to identify a murine gene sequence orthologous to a Submitted Gene
through HYSEQ'S standard resources.

        1.14 "JOINT PROJECT INTELLECTUAL PROPERTY, DELTAGEN PROJECT INTELLECTUAL
PROPERTY AND HYSEQ PROJECT INTELLECTUAL PROPERTY" (collectively, "Project
Intellectual

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       3

Property") shall have the meanings set forth in Section 10.1.1.

        1.15 "JOINT PROJECT PATENTS, DELTAGEN PROJECT PATENTS AND HYSEQ PROJECT
PATENTS" (collectively, "Project Patents") shall have the meanings set forth in
Section 10.1.1.

        1.16 "LOSS" has the meaning set forth in Section 8.1.

        1.17 "PATENT(s)" means any patent, provisional or patent application,
and all additions, divisions, continuations, continuations-in-part,
substitutions, reissues, extensions, registrations, supplementary protection
certificates and renewals of any of the foregoing.

        1.18 "PAYMENT ONE," "PAYMENT TWO," PAYMENT THREE" AND "TOTAL PAYMENT"
shall have the meanings set forth in Section 5.1.

        1.19 "PERSON" means a person, corporation, partnership, limited
liability company or any other entity.

        1.20 "CONFLICTING PIPELINE" means a gene or gene sequence that, as of
the date submitted by HYSEQ to DELTAGEN Section 4.1.1 of this Agreement, has
been designated for research and development by DELTAGEN [***].

        1.21 "PROJECT" means the activities of the Parties under the Development
Program with respect to a single Project Gene and/or its orthologous Project
Murine Gene (and with respect to any Project Knock-Out Mice, Secreted Proteins,
Derivative Proteins, Secreted Protein Candidates and Products derived
therefrom), as set forth in the Work Plan in accordance with this Agreement, or
as directed by the Steering Committee.

        1.22 "PROJECT KNOCK-OUT MOUSE" OR "PROJECT KNOCK-OUT MICE" means any
mouse or mice in which DELTAGEN has, pursuant to this Agreement, interrupted,
disrupted, or deleted a specific gene or portion thereof, orthologous to a
Project Gene, to inactivate the function of such gene in such mouse or mice.

        1.23 "PRODUCT" means any product that contains as an active ingredient
(i) a [***] (or portion thereof), or (ii) an agonist or antagonist (including,
without limitation, anti-sense, antibodies and small molecules) of a [***].

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       4

        1.24 "PROJECT GENE" means a Proposed Gene that has been designated by
the Steering Committee as a "project gene" pursuant to Section 4.2.

        1.25 "PROJECT MURINE GENE" means a murine gene sequence that the
Steering Committee has designated as the orthologous murine gene for the human
gene sequence of a Project Gene.

        1.26 "PROPOSED GENE" means a gene sequence (i) submitted to the Steering
Committee for consideration for inclusion under the Development Program as a
"project gene" as set forth in Section 4.1; (ii) which is believed to encode a
[***]; (iii) for which a [***] and the [***] believed to be produced by such
[***]; and (iv) its corresponding [***].

        1.27 "PROTEIN" means a [***], polymer compound composed of a variety of
amino acids joined by peptide linkages, including allelic variants thereof and
post-translationally modified variants thereof (i.e., glycosylated proteins).

        1.28 "REJECTED PROPOSED GENE" has the meaning set forth in Section 4.3.

        1.29 "REJECTED PROJECT GENE" has the meaning set forth in Section 5.5.3.

        1.30 "REJECTED SUBMITTED GENE" has the meaning set forth in Section
4.1.2(b).

        1.31 "RESTRICTION TERM" means the period of time a Rejected Project Gene
is subject to the restrictions set forth in Section 5.5.3. Unless a different
time period is voted on and approved by a majority of the Steering Committee for
a particular Rejected Project Gene, the Restriction Term for such Rejected
Project Gene shall be [***] from the date it becomes a Rejected Project Gene
under this Agreement.

        1.32 "SECRETED PROTEIN" means a [***] released from a cell.

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       5

        1.33 "SECRETED PROTEIN CANDIDATE" means a Secreted Protein which the
Parties through the Steering Committee have designated as a "secreted protein
candidate" pursuant to Section 5.5.1 and any and all Derivative Proteins
thereof.

        1.34 "SUBMITTED GENE" means a human gene coding sequence (i) submitted
to DELTAGEN by HYSEQ for consideration for inclusion as a "proposed gene" as set
forth in Section 4.1.1; (ii) which is believed to [***]; and (iii) for which a
[***] and the [***] believed to be produced by such [***].

        1.35 "TECHNICAL INFORMATION" means all technology, know-how, copyrights,
trade secrets, software, techniques, data, technical information and all other
intellectual property and other proprietary information, including all
inventions (whether or not patentable), improvements and developments,
practices, applications, protocols, concepts, biological materials (including
nucleic acid sequences, RNA, DNA, organisms, proteins, polypeptides, plasmids
and vectors), processes, methods (including methods of use or treatment for
human or murine secreted proteins), pre-clinical, clinical and regulatory data
and information, clinical and regulatory strategies, test data, analytical and
quality control data, reports, manufacturing information, patent data or
descriptions, development information, drawings, specifications, designs
(whether or not registerable), plans, proposals and technical data and manuals,
documents, rights in databases, computer data and source code.

        1.36 "TERM" has the meaning set forth in Section 11.1.

        1.37 "TERRITORY" means the entire world.

        1.38 "THIRD PARTY" means any Person other than a Party to this Agreement
or an Affiliate of either Party.

        1.39 "VALID CLAIM" means any claim within [***] which (i) has not been
[***] and (ii) has not been [***].

        1.40 "WORK PLAN" means the work plan developed by the Steering
Committee, as may be modified from time to time by the Steering Committee
(initially Exhibit C), that sets forth the responsibilities of the Parties under
the Development Program, including in connection with the selection of the
Project Genes from Proposed Genes and with respect to the generation and

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       6

analysis of the Project Knock-Out Mice. The First Pass Phenotypic Analysis and
Exhibit A shall be part of the Work Plan and therefore references to the Work
Plan shall include the First Pass Phenotypic Analysis and Exhibit A.

                                    ARTICLE 2
                                  LICENSE GRANT

        2.1 HYSEQ LICENSE. During the Term of this Agreement and subject to the
terms and conditions hereof, HYSEQ hereby grants to DELTAGEN the following
licenses:

               2.1.1 SUBMITTED GENES. On a Submitted Gene-by-Submitted Gene
basis, a non-exclusive right and license, until the earlier of (a) the date upon
which a Submitted Gene becomes a Rejected Submitted Gene under this Agreement or
(b) the date upon which a Submitted Gene becomes a Proposed Gene under this
Agreement (at which time the license under Section 2.1.2 shall become
effective), under the HYSEQ Patents and HYSEQ Know-How solely for the purpose of
conducting review and analysis activities with respect to such Submitted Gene in
accordance with the terms and conditions of this Agreement including determining
whether such Submitted Gene is in Deltagen's Conflicting Pipeline, and
performing an intellectual property analysis with respect to DELTAGEN's use of
such Submitted Genes.

               2.1.2 PROPOSED GENES. On a Proposed Gene-by-Proposed Gene basis,
and upon submission by HYSEQ of the information related to such Proposed Genes
under Section 4.1.3, a non-exclusive right and license, until the earlier of (a)
the date upon which a Proposed Gene becomes a Rejected Proposed Gene under this
Agreement or (b) the date upon which a Proposed Gene becomes a Project Gene
under this Agreement [***], under the HYSEQ Patents and HYSEQ Know-How solely
for the purpose of conducting review and analysis activities with respect to
such Proposed Gene in accordance with the terms and conditions of this
Agreement, including the Work Plan, including to identify murine gene sequences
orthologous to the Proposed Gene if such activities are not already performed by
HYSEQ or if instructed by the Steering Committee.

               2.1.3 PROJECT GENES. On a Project Gene-by-Project Gene basis, and
upon designation of a Proposed Gene as a Project Gene under this Agreement, a
co-exclusive right and license until the earlier of (a) the date upon which such
Project Gene becomes a Rejected Project

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       7

Gene [***], or (b) termination of the collaboration in accordance with the
provisions of Section 11.2.2 of this Agreement; including the right to grant
sublicenses to Affiliates and Third Party contractors as set forth in Section
2.4, under the HYSEQ Patents and HYSEQ Know-How to perform the following
activities: (i) to analyze and use such Project Gene and any derivatives thereof
in accordance with the terms and conditions of this Agreement, including the
Work Plan, (ii) to use, make, create, generate, produce, breed, test and conduct
research and development activities in connection with Project Knock-Out Mice
and progeny and other derivatives thereof in accordance with the terms and
conditions of this Agreement, including the Work Plan, (iii) to use, make,
generate, produce, create, isolate, purify, identify and conduct research and
development activities in connection with such Project Gene (and/or any
mutation, fragment, allelic variant, analog, homolog or ortholog of such Project
Gene and/or any expression products (including any Secreted Proteins, Derivative
Proteins and/or Products) and/or derivatives thereof in accordance with the
terms and conditions of this Agreement, including the Work Plan, and (iv)
subject to a separate agreement entered into in accordance with Article 6, to
develop, make, have made, use, distribute, offer for sale, import, export and
sell Products. If the license under this Section 2.1.3 has terminated in
accordance with (a) or (b) above, such license shall again become effective
until termination in accordance with (a) or (b) if, in accordance with either
Section 5.5.3.1 or Section 5.5.3.2 of this Agreement, the Steering Committee
votes to designate a particular Rejected Project Gene a Project Gene again under
this Agreement.

               2.1.4 REJECTED PROJECT GENES.

                      (a) On a Rejected Project Gene-by-Rejected Project Gene
basis, and upon designation of a Project Gene as a Rejected Project Gene under
this Agreement, a co-exclusive internal use license until [***] for research
purposes only to the Rejected Project Gene and its related Project Murine Gene
under the HYSEQ Patents and HYSEQ Know-How to allow DELTAGEN to conduct similar
research activities for itself during the Restriction Term as contemplated for
Project Knock-Out Mice and Project Genes under this Agreement.

                      (b) On a Rejected Project Gene-by-Rejected Project Gene
basis pursuant to the procedure set forth in Section 5.5.3, and upon [***] to
perform the following activities: (i) to [***] such Rejected Project Gene and
any derivatives, (ii) to [***], (iii) to [***], and (iv) to

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       8

[***] such Rejected Project Gene (or portion thereof), or an agonist or
antagonist (including, without limitation, anti-sense, antibodies and small
molecules) of a protein encoded by such Rejected Project Gene. Upon and after
[***] to a Rejected Project Gene under this Section 2.14(b) for which HYSEQ has
[***], DELTAGEN will (i) notify HYSEQ when [***], (ii) notify HYSEQ upon [***],
(iii) [***], and (iv) keep complete and accurate [***] and allow a [***] audit
by a third party independent auditor of such records, [***], in order to [***].
In addition to any other remedies available to HYSEQ under this Agreement, HYSEQ
shall have the right to [***] under this paragraph upon written notice to
DELTAGEN if DELTAGEN [***] under this Section 2.1.4(b).

        2.2 CO-EXCLUSIVE LICENSE. The term "co-exclusive" as used herein shall
operate to exclude all other Persons, except for HYSEQ or DELTAGEN, as
applicable.

        2.3 DELTAGEN LICENSE. Subject to the terms and conditions of this
Agreement, DELTAGEN hereby grants to HYSEQ the following licenses:

               2.3.1 PROJECT GENES. On a Project Gene-by-Project Gene basis, and
upon designation of a Proposed Gene as a Project Gene under this Agreement, a
co-exclusive right and license until the earlier of (a) the date upon which such
Project Gene becomes a Rejected Project Gene, or (b) termination of the
collaboration in accordance with the provisions of Section 11.2.2 of this
Agreement; including the right to grant sublicenses to Affiliates and Third
Party contractors as set forth in Section 2.4, under the DELTAGEN Knock-Out
Technology and DELTAGEN Project Intellectual Property, and subject to a separate
agreement entered into in accordance with Article 6, to develop, make, have
made, use, distribute, offer for sale, import, export and sell Products.

               2.3.2  REJECTED PROJECT GENES.

                      (a) On a Rejected Project Gene-by-Rejected Project Gene
basis, and upon designation of a Project Gene as a Rejected Project Gene under
this Agreement, a co-exclusive internal use license until [***] for research
purposes only to the Rejected Project Gene and its related Project Murine Gene
under the DELTAGEN Knock-Out Technology and DELTAGEN Project Intellectual
Property to allow HYSEQ to conduct similar research activities for itself

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       9

during the Restriction Term as contemplated for Project Knock-Out Mice and
Project Genes under this Agreement.

                      (b) On a Rejected Project Gene-by-Rejected Project Gene
basis pursuant to the procedure set forth in Section 5.5.3, and [***] to perform
the following activities: (i) to [***], (ii) to [***], (iii) to [***], and (iv)
to [***] by such Rejected Project Gene.

        2.4 SUBLICENSES. The licenses granted to each Party pursuant to Sections
2.1.3, 2.1.4(b), 2.3.1 and 2.3.2(b) include the right to sublicense all or part
of such rights to such Party's Affiliates and/or to Third Party contractors to
perform any obligations of such Party under the Development Program (with
respect to Sections 2.1.3 and 2.3.1), provided that such Party provides written
notice to the other Party of any such sublicense and the terms and conditions of
such grant of sublicense (i) are consistent with and do not violate the terms
and conditions of this Agreement, and (ii) ensure that such Persons are
obligated in writing to comply with the terms and conditions of this Agreement,
including being bound by obligations of confidentiality which are comparable to,
or more stringent than, the provisions of Article 9. Notwithstanding anything to
the contrary in this Agreement, if the Steering Committee designates a Proposed
Gene as a Project Gene for work by DELTAGEN after being informed pursuant to
Section 4.1.3 that HYSEQ has already submitted the corresponding Proposed Gene
to a Third Party contractor for analysis under a legally binding contract for
such Proposed Gene, then HYSEQ shall be authorized under this paragraph to
license or sublicense to the Third Party contractor for the purposes of
conducting such analysis. The results of such analysis shall be reported to the
Steering Committee.

        2.5 NO IMPLIED RIGHTS OR LICENSES. No right or license is granted under
this Agreement by either Party to the other Party, either expressly or by
implication, except as expressly set forth herein.

        2.6 OTHER ACTIVITIES OF THE PARTIES. During the Term, neither Party
shall, either itself or through or with any Affiliate or Third Party, (a) use or
conduct any [***] with respect to any Proposed Genes (unless and until such
Proposed Genes are Rejected Project Genes), Project Genes, Project Knock-Out
Mice, Project Murine Genes, Secreted Proteins, Derivative Proteins, Secreted
Protein Candidates or Products, except if and to the extent expressly permitted
under

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       10

this Agreement or as otherwise mutually agreed by the Parties in writing,
whether pursuant to Article 6 or otherwise; or (b) [***] any Proposed Genes
(unless and until such Proposed Genes are Rejected Project), Project Genes,
Project Knock-Out Mice, Project Murine Genes, Secreted Proteins, Derivative
Proteins, Secreted Protein Candidates or Products that are subject to this
Agreement, including with respect to any progeny, mutations, fragments, allelic
variants, analogs, homologs or orthologs, and/or any expression products
(including any such Secreted Proteins, Derivative Proteins and/or Products) or
derivatives of any of the foregoing.

                                    ARTICLE 3
                   DEVELOPMENT PROGRAM AND STEERING COMMITTEE

        3.1 DEVELOPMENT PROGRAM.

               3.1.1 OVERVIEW OF DEVELOPMENT PROGRAM. HYSEQ and DELTAGEN shall
engage in a development program for the identification, research and development
of Secreted Protein Candidates and Product(s) through the analysis and study of
Project Genes provided by HYSEQ, and to generate, study and analyze Project
Knock-Out Mice from murine genes orthologous to the Project Genes (the
"Development Program"). Deltagen shall use commercially reasonable efforts to
generate ES cells for each of the [***] Project Genes selected pursuant to
Section 4.1.1, with the goal of generating [***] ES cell lines, [***]. After
identification of Secreted Protein Candidates, the Steering Committee shall
decide whether to conduct further research and development activities under the
Development Program with respect to such Secreted Protein Candidates (and/or any
Products which incorporate such Secreted Protein Candidates), or to develop and
commercialize such Secreted Protein Candidates (and/or any Products which
incorporate such Secreted Protein Candidates), pursuant to the terms and
conditions of a separate agreement, whether in a collaboration between the
Parties, or with Third Party partners or licensees or as otherwise determined by
the Steering Committee pursuant to Section 6.2.

               3.1.2 DEVELOPMENT PROGRAM COSTS AND EXPENSES. The Parties shall
share [***] all costs and out-of-pocket expenses arising out of the Development
Program other than the activities under Sections 4.1.3 and 5.3, and as otherwise
may be agreed to by the Parties in a

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
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                                       11

separate agreement for the development of a Secreted Protein Candidate or
Product. The costs and expenses of activities pursuant to Sections 4.1.3 and 5.3
shall be paid for solely by [***].

        3.2 COOPERATION AND SHARING OF INFORMATION. The Parties shall cooperate,
coordinate and consult with each other in connection with performing their
activities under the Development Program, including under the Work Plan. Each
Party shall also share with the other Party, as determined by the Steering
Committee, or as reasonably requested by the other Party, data and information
and other Technical Information, derived from their activities under the
Development Program, including with respect to DELTAGEN related data and
information arising in connection with DELTAGEN's analysis and study of the
Project Knock-Out Mice under the Work Plan.

               3.2.1 ACCESS TO FACILITIES. Representatives of each Party,
including members of the Steering Committee, may, upon reasonable notice during
normal business hours, (a) visit any facilities where Development Program
activities are being conducted, and (b) consult informally, during such visits
and by telephone, concerning the Development Program. The visiting Party's
representatives shall be advised of, and bound by, the confidentiality
obligations set forth in Article 9 (or confidentiality obligations that are at
least comparable or more stringent than those set forth in Article 9), and shall
follow such security and facility access procedures as directed, and designated
by the Party who's facilities are being visited. The Party whose facilities are
being visited may require that the representatives of the visiting Party be
accompanied by its representatives, at all times while the visiting Party is at
its facilities.

               3.2.2 RECORD KEEPING. Each Party shall maintain complete and
accurate records in accordance with its internal practices for keeping such
records, in good scientific manner and in appropriate detail for patent and
regulatory purposes, of its activities conducted under the Development Program
and including such data and materials as are required to be maintained pursuant
to applicable laws and regulations. To the extent practical, such written
records shall be kept separately from written records documenting other
activities of each Party and shall be maintained on a Project-by-Project basis.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       12

               3.2.3 COMPLIANCE. Each Party shall, and shall ensure that its
employees, consultants, contractors and agents, perform their respective
activities under the Development Program in accordance with all applicable laws,
rules and regulations in the Territory.

               3.2.4 UPDATES AND QUARTERLY AND FINAL REPORTS. Each Party shall
provide updates to the Steering Committee, on at least a monthly basis, and
written reports by the end of each calendar quarter, detailing the then current
status and results of the activities of the Parties under the Development
Program, including with respect to DELTAGEN, the then current status and results
of the First Pass Phenotypic Analysis for each Project, as set forth in Section
5.3.

        3.3 STEERING COMMITTEE RESPONSIBILITIES, COMPOSITION AND PROCEDURES.

               3.3.1 ORGANIZATION AND ROLE. DELTAGEN and HYSEQ shall promptly
after the Effective Date organize a steering committee (the "Steering
Committee") to plan, manage and oversee the Development Program. Without
limiting the foregoing, the Steering Committee's responsibilities shall include
the following:

                      (a) developing, reviewing, updating and modifying in
writing the Work Plan set forth in Exhibit A and developing the mediation
procedure to be set forth in Exhibit B; provided, however, that if the Parties
cannot agree, after good faith efforts, to a time frame for generation of the ES
lines to be generated from the [***] Project Genes under this Agreement, then
the Work Plan shall be deemed to provide that, within [***] from the date
DELTAGEN commences work on such Project Genes, DELTAGEN shall use [***] efforts
to generate ES cells for the first [***] Project Genes (provided all [***]
Project Genes have been designated as such upon the beginning of such [***]
period) and, within an additional [***], DELTAGEN shall use [***] efforts to
generate ES cells for the remaining [***] Project Genes (provided all [***]
remaining Project Genes have been designated as such upon beginning of such
[***] period).

                      (b) designating genes as Project Genes from the Proposed
Genes submitted by HYSEQ to the Steering Committee pursuant to Section 4.1;

                      (c) performing due diligence on each Proposed Gene and
reviewing and determining, based on such due diligence, the relative strength of
any IP positions around

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any Project Genes under consideration, and including such determination in the
decision whether to designate a Project Gene as a Secreted Protein Candidate.

                      (d) determining which Project Genes to submit to DELTAGEN
for further analysis and study under the Development Program pursuant to Section
5.2;

                      (e) reviewing the First Pass Phenotypic Analysis of each
of the Project Genes submitted to DELTAGEN and determining the necessity of
conducting phenotypic testing, observation, or analysis not included in the
First Pass Phenotypic Analysis (including any further research and development
activities to be conducted by any Third Parties) and which, if any, of such
additional phenotypic tests, observations, or analyses are appropriate, as set
forth in Article 5;

                      (f) determining the necessity of conducting further
research and development on each of the Project Genes (including any further
research and development activities to be conducted by any Third Parties);
provided, however, that the foregoing shall in no ay limit HYSEQ's right to
independently conduct such further research and development in accordance with
the terms and conditions of this Agreement, such information to be provided to
the Steering Committee for such Project Gene in accordance with the terms and
conditions of this Agreement;

                      (g) determining, under Section 5.5.1, which, if any, of
the Secreted Proteins together with the Derivative Proteins, will be designated
as "secreted protein candidates";

                      (h) reviewing the Parties' reports and updates in
connection with their respective activities under the Development Program,
including the reports submitted by DELTAGEN pursuant to Section 5.3; and

                      (i) deciding whether and how to develop any Secreted
Protein Candidates and Products (e.g., whether under a collaboration between the
Parties or with Third Party partners or licensees or otherwise), as set forth in
Article 6.

               3.3.2 COMPOSITION. The Steering Committee shall consist of three
(3) members from DELTAGEN and three (3) members from HYSEQ. Each Party shall
have the right to

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appoint one (1) of its three (3) members to be a co-chairperson of the Steering
Committee. The Parties shall each have the right, upon notifying the other, to
change its members of the Steering Committee at any time during the Term.

               3.3.3 MEETINGS; AND MINUTES. The Parties shall hold meetings of
the Steering Committee as mutually agreed by the Parties (but in no event less
than once each calendar quarter) to review the Development Program and to
discuss future activities under this Agreement. The first meeting of the
Steering Committee shall be held within thirty (30) days of the Effective Date.
Minutes of all meetings setting forth decisions of the Steering Committee,
including with respect to the Development Program, shall be prepared by one of
the Parties, each Party alternating assuming this responsibility at each
meeting, and circulated to both Parties within fifteen (15) days after each
meeting, but minutes shall not become official until approved by both Parties
(which approval the Parties shall use reasonable efforts to give within fifteen
(15) days of receipt of such minutes).

               3.3.4 STEERING COMMITTEE DECISIONS. Each vote of the Steering
Committee shall include all current members of the Steering Committee . Except
as otherwise expressly provided for in this Agreement, all decisions of the
Steering Committee shall be by [***] members of the Steering Committee after
good faith discussions. [***] Should, however, the Parties not be able to reach
such [***] despite such good faith efforts, and should a [***] of the Steering
Committee exist thirty (30) days after the date on which a disagreement arose,
then, if the subject matter of the decision is [***] under this Agreement,
including but not limited to decisions as to whether to [***], such disagreement
shall be elevated to the senior executives of the Parties for good faith
discussion to try and reach consensus between the Parties. In the event that the
senior executives have not reached agreement (despite such good faith
discussions) within sixty (60) days after the date on which the disagreement
arose, then (i) if the subject of such disagreement is whether or not [***],
then such [***] under this Agreement, and (ii) except as set forth in the
preceding subsection (i), unless otherwise mutually agreed by the Parties, all
other disagreements of a material nature shall be submitted for resolution to
the dispute resolution process pursuant to Section 13.5.

                                    ARTICLE 4

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                           SELECTION OF PROJECT GENES

        4.1 STEERING COMMITTEE REVIEW AND SELECTION OF PROPOSED GENES

               4.1.1 SUBMITTED GENES. Within [***] after the first Steering
Committee meeting, HYSEQ shall submit in writing to DELTAGEN for its review and
consideration an initial written list(s) of [***] Submitted Genes and, within
[***] after the Effective Date, shall submit in writing to DELTAGEN for its
review and consideration a written list(s) of an additional [***] Submitted
Genes for DELTAGEN to review under this Section 4.1.1. HYSEQ shall use [***]
efforts to submit additional Submitted Genes under this Agreement during such
[***] period to replace Rejected Submitted Genes that DELTAGEN has rejected
under this Section 4.1.1 until [***] Project Genes have been selected. HYSEQ
agrees to [***] when deciding which human gene sequences to include in the list
of Submitted Genes to be submitted to DELTAGEN. Any submission of Submitted
Genes subsequent to such [***] period shall be subject to the approval of the
Steering Committee. All Submitted Genes submitted by HYSEQ to the Steering
Committee under this Section 4.1 shall be accompanied by at least a partial
murine ortholog gene sequence believed by HYSEQ to correspond to the gene
sequence of such Submitted Gene (unless HYSEQ is unable to identify such an
orthologous partial murine gene sequence for a Submitted Gene, in which case
HYSEQ shall report such results to the Steering Committee) and DELTAGEN shall
notify HYSEQ as to whether or not, [***] as of the date of its submission by
HYSEQ. If any of the Submitted Genes have [***], HYSEQ shall provide this
information promptly to the Steering Committee with its information under
Section 4.1.3 and HYSEQ hereby expressly acknowledges and agrees that if the
Steering Committee designates such a Submitted Gene as a Proposed Gene or a
Project Gene, as between DELTAGEN and HYSEQ that HYSEQ is [***], while such
Proposed Gene or Project Gene, as applicable, remains under this Agreement, and
HYSEQ shall not [***] except as provided in Section 2.1.4(b) for a Rejected
Project Gene.

               4.1.2 PROPOSED GENES. DELTAGEN shall notify HYSEQ within thirty
(30) days after its receipt of the Submitted Gene and, if applicable, its
accompanying murine ortholog sequence, whether DELTAGEN accepts or rejects such
Submitted Gene, such acceptance or rejection being within DELTAGEN's sole
discretion.

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                      (a) Any such accepted Submitted Gene for which
notification has been provided shall be deemed a Proposed Gene. Within [***]
after such written notification, HYSEQ will provide to DELTAGEN the supporting
information for such Proposed Gene in accordance with Section 4.1.3.

                      (b) If DELTAGEN rejects a Submitted Gene such Submitted
Gene shall be deemed a Rejected Submitted Gene. With respect to any such
Rejected Submitted Gene, any of HYSEQ's rights under HYSEQ's Patents or HYSEQ
Know-How related solely to such Submitted Gene shall return to HYSEQ under this
Agreement and shall not be subject to further restriction under this Agreement
other than DELTAGEN's obligations of confidentiality under Article 9 of this
Agreement. Each of the Parties shall perform no additional services under this
Agreement with regard to such Rejected Submitted Gene. Each of the Party's
right, title and interest in and to such Rejected Submitted Gene shall remain
with and vest fully in that Party, and the other Party shall have no right,
title, or interest therein or thereto.

               4.1.3 SUPPORTING INFORMATION AND DISCLOSURES. Together with each
written list of Submitted Genes, HYSEQ shall fully disclose to the Steering
Committee in writing or electronic form, with respect to each such Submitted
Gene, the information actually known to HYSEQ regarding such Submitted Gene's
murine ortholog sequence and the results of HYSEQ's Initial Murine Gene
Analysis. With respect to each Proposed Gene, HYSEQ shall disclose to the
Steering Committee in writing or in electronic form the following information
actually known to HYSEQ: (i) any and all Technical Information and Patents
(including but not limited to HYSEQ Patents and HYSEQ Know-How) covering such
Proposed Gene that are owned or controlled by HYSEQ, (ii) any restrictions on
the use of such Proposed Gene, (iii) [***], (iv) any and all facts and
information which are limiting or preventing, or that could or would limit or
prevent, HYSEQ's right or ability to grant the license to DELTAGEN pursuant to
Section 2.1, or are causing, [***], and (iv) [***] under this Agreement,
including the following:

                      (a) any pre-existing or other rights, interests and/or
options in or to, or any other encumbrances (including any liens) on, such
Proposed Gene and/or any HYSEQ Patents or HYSEQ Know-How covering or relating to
such Proposed Gene;

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
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                                       17

                      (b) any licenses or other agreements with any Person
relating to such Proposed Gene (including any in-licensed technology relating to
such Proposed Gene), or relating to the HYSEQ Patents or HYSEQ Know-How covering
or relating to such Proposed Gene; and

                      (c) any [***] of such Proposed Gene and/or any HYSEQ
Patents or HYSEQ Know-How covering or relating to such Proposed Gene.

HYSEQ shall also provide further information, as may reasonably be requested by
the Steering Committee, and if requested, shall make available to the Steering
Committee the appropriate technical and other HYSEQ employees to answer
questions posed by the Steering Committee with respect to the Proposed Genes and
the information and disclosures submitted under this Section 4.1.3. With respect
to a Proposed Gene, if HYSEQ makes a [***] in writing pursuant to this Section
4.1.3 of [***], prior to or concurrently with its submission to the Steering
Committee of such Proposed Gene, HYSEQ [***]; provided that DELTAGEN shall have
the right to refuse to conduct any activities with respect to such Proposed
Gene, if DELTAGEN, in its sole discretion, so chooses, under this Section 4.1.3
or Section 4.1.1 above, either due to HYSEQ's inability to provide information,
or as a result of the information provided by HYSEQ or information DELTAGEN
acquires independently of HYSEQ. If DELTAGEN chooses to not conduct any
activities with respect to such Proposed Gene under this Section 4.1.3, such
Proposed Gene shall become a Rejected Proposed Gene in accordance with the terms
and conditions of Section 4.3 of this Agreement. DELTAGEN may also choose not to
continue with a Proposed Gene under this Agreement if technical obstacles make
it commercially reasonable not to proceed. In such event, DELTAGEN shall notify
the Steering Committee, and the Steering Committee may vote affirmatively to
continue with such Proposed Gene as a Project Gene with a [***] sharing between
the Parties of all costs arising from such technical obstacles.

        4.2 SELECTION OF PROJECT GENES. After reviewing a Proposed Gene and the
information and disclosures received from HYSEQ pursuant to Sections 4.1.1 and
4.1.3, and the information and reports received from DELTAGEN, and if
applicable, HYSEQ, pursuant to Sections 4.1.3 with respect to such Proposed
Gene, the Steering Committee members shall vote on whether to include such
Proposed Gene as a "project gene" hereunder. If the Steering Committee members

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vote affirmatively to include a Proposed Gene as a "project gene" under this
Agreement, then upon such vote, such Proposed Gene shall become a Project Gene.

        4.3 REJECTED PROPOSED GENES. Unless otherwise decided by the Parties or
the Steering Committee, any Proposed Gene which (i) DELTAGEN has notified HYSEQ
it shall not work on under this Agreement (ii) the Steering Committee members
have voted to reject as a "project gene," and/or (iii) the Steering Committee
members have not voted affirmatively to include as a "project gene" under this
Agreement within ninety (90) days after submission of information regarding the
Proposed Gene to the Steering Committee pursuant to Section 4.1.3, shall be a
"Rejected Proposed Gene." Each of the Parties shall perform no additional
services under this Agreement with regard to such Rejected Proposed Gene. Each
of the Party's right, title and interest in and to such Rejected Proposed Gene
(if any) shall remain with and vest fully in that Party, and the other Party
shall have no right, title, or interest therein or thereto.

                                    ARTICLE 5
                HYSEQ FUNDING AND DEVELOPMENT PROGRAM ACTIVITIES

        5.1 HYSEQ DEVELOPMENT FUNDING. As partial consideration for the research
and development activities to be conducted by DELTAGEN under this Agreement,
HYSEQ shall pay DELTAGEN as follows:

                      (a) within [***] after the Effective Date, HYSEQ shall pay
to DELTAGEN [***] U.S. Dollars (U.S.$[***]) ("Payment One");

                      (b) within [***] of the Effective Date, HYSEQ shall pay to
DELTAGEN [***] U.S. Dollars (U.S.$[***]) ("Payment Two") if the Steering
Committee has designated [***] two hundred (200) Project Genes within [***]
after the Effective Date; [***];

                      (c) within [***] of the Effective Date, HYSEQ shall pay to
DELTAGEN [***] U.S. Dollars (U.S.$[***]) ("Payment Three") if DELTAGEN has
created two hundred (200) ES cell lines for Project Genes; [***]; and

                      (d) within twenty-four (24) months after the Effective
Date, HYSEQ shall pay to DELTAGEN the remaining amount of a pro-rated Ten
Million U.S. Dollars (U.S.$10,000,000) ("Total Payment") [***].

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HYSEQ acknowledges and agrees that the payments payable to DELTAGEN pursuant to
this Section are non-refundable, and may be used and disposed of as DELTAGEN, in
its reasonable business judgment, determines is appropriate in accordance with
the terms and conditions of this Agreement.

        5.2 INITIATION OF PROJECTS; AND PERFORMANCE AND DELAYS. The Steering
Committee shall determine which Projects to submit to DELTAGEN to initiate work
on such Projects under the Development Program. Each Party shall use reasonable
commercial efforts to fulfill their obligations with respect to each Project as
set forth herein (including the Work Plan), and to perform its other obligations
under this Agreement; provided that, with respect to DELTAGEN's activities under
the Development Program, HYSEQ acknowledges and agrees that the performance of
such activities may involve a number of technologically complex steps and that
any time periods for performance, whether set out in the Work Plan or elsewhere
in this Agreement, may be subject to change due to potential technological
difficulties encountered, and any such delays or technical issues shall not be
considered a breach by DELTAGEN under this Agreement. If a Project is delayed
because either Party determines that there are any technical issues with respect
to a Project of a material nature, it shall notify the Steering Committee in
writing describing the delayed task and the reasons for such delay. After
receiving such notice, if necessary, the Steering Committee shall meet to review
the reason for such delays and any technical issues raised by the notifying
Party, to consider how best to proceed and whether to modify the Work Plan
(including to adjust any timelines contained therein), if and to the extent
necessary. If requested by the Steering Committee, the Parties shall provide
information to the Steering Committee to assist it in its review of the Project.
The Steering Committee may vote at any time to discontinue or suspend a Project
if the Steering Committee determines that it is commercially reasonable or
necessary to do so. DELTAGEN may determine, in its reasonable business judgment,
to [***]; provided, however, that DELTAGEN shall notify HYSEQ in writing within
three (3) business days of such determination and shall [***]. Upon such
decision by the Steering Committee or DELTAGEN, as applicable, to [***], the
applicable Project Gene shall immediately become a Rejected Project Gene.

        5.3 GENERATION AND TESTING OF PROJECT KNOCK-OUT MICE; AND FIRST PASS
PHENOTYPIC

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ANALYSIS; AND UPDATES AND REPORTS.

               5.3.1 CERTAIN DELTAGEN ACTIVITIES. For each Project initiated by
the Steering Committee pursuant to Section 5.2, DELTAGEN shall, as set out in
the Work Plan, use [***] efforts to: (i) [***] to create and generate a
corresponding Project Knock-Out Mouse, (ii) generate Project Knock-Out Mice
[***] using the Project Murine Gene that is orthologous to the Project Gene
which is the subject of the Project; and (iii) conduct a First Pass Phenotypic
Analysis of such Project Knock-Out Mice. Exhibit A may be reasonably modified in
writing from time to time [***] to add tests, observations and/or analyses to be
performed by DELTAGEN at any time under this Agreement and DELTAGEN shall notify
HYSEQ of such changes as part of its report regarding First Pass Phenotypic
Analysis.

               5.3.2 UPDATES. Within ten (10) days after the end of each
calendar quarter, DELTAGEN shall provide all Steering Committee members with a
written report describing the status, and expected completion date, of its work
on each Project under the Work Plan and with data from any portion(s) of the
First Pass Phenotypic Analysis completed on a Project during the just-ended
Calendar Quarter, if any, and if it has not already provided such information to
the Steering Committee. If and as reasonably requested by the Steering
Committee, DELTAGEN shall make persons working on its behalf on a Project
available during normal business hours for a reasonable number of consultations
with the Steering Committee regarding such Project. Such consultations will
either be in-person at such person's place of employment or via videoconference
or teleconference.

               5.3.3 FIRST PASS PHENOTYPIC ANALYSIS REPORT. Once DELTAGEN
completes the First Pass Phenotypic Analysis on a Project under the Work Plan,
it shall (to the extent not already provided pursuant to Section 5.3.2) submit
to the Steering Committee for the Steering Committee's review a final report of
the results of such Project.

        5.4 ADDITIONAL TESTING; COSTS.

               5.4.1 ADDITIONAL TESTING. If, at any time during this Agreement,
HYSEQ or DELTAGEN believes an additional test, observation, or analysis not
included in the First Pass Phenotypic Analysis, or covered by the Work Plan
would be useful to a Project, the Party may submit its proposal to the Steering
Committee for the Steering Committee's approval. If the

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Steering Committee approves any such additional tests, observations, or analysis
requested by either Party, or if the Steering Committee determines that it is
necessary to assist it with determining whether to designate as a "secreted
protein candidate," a Secreted Protein produced by the Project Gene that is the
subject of such Project, the Steering Committee may request that DELTAGEN or
HYSEQ perform additional assays, including phenotypic tests, observations, or
analyses not included in the First Pass Phenotypic Analysis on such Project
(collectively, "Additional Tests"). DELTAGEN or HYSEQ, as applicable, shall
perform the Additional Tests, as requested by the Steering Committee pursuant to
this Section; provided that the Parties shall share the costs as set forth in
Section 5.4.2. Once DELTAGEN or HYSEQ, as applicable, has completed such
Additional Tests on a Project, DELTAGEN or HYSEQ, as applicable, shall submit to
the Steering Committee for the Steering Committee's review of the Project under
Section 5.5 a report of the results of such additional services.

               5.4.2 SHARING OF COSTS. HYSEQ or DELTAGEN, as applicable, shall
reimburse the Party performing the Additional Tests for [***] of the reasonable
costs (including FTEs) and reasonable out-of-pocket expenses incurred in
performing the Additional Tests, within thirty (30) days of HYSEQ's or
DELTAGEN's, as applicable, receipt of an invoice from the Party performing the
Additional Tests, including reasonable supporting documentation, covering such
costs and out-of-pocket expenses incurred in connection with conducting such
activities under this Agreement. In the event there is a good faith dispute over
an amount owed by a Party under this Section 5.4.2, the disputed portion of the
payment may be delayed, and such payment shall not be considered delinquent
pending a resolution of the Parties' dispute.

        5.5 DESIGNATION OF SECRETED PROTEIN CANDIDATES; DESIGNATION GUIDELINES.

               5.5.1 DESIGNATION OF SECRETED PROTEIN CANDIDATES. After reviewing
the information provided to it pursuant to Sections 3.2.4, 5.3 and 5.4, with
respect to a Project, the Steering Committee members shall vote whether to
designate the Secreted Protein produced by the Project Gene which is the subject
of such Project, together with its Derivative Proteins, as a "secreted protein
candidate." If the Steering Committee members vote affirmatively, within [***]
after receiving such information provided to it regarding a Secreted Protein, a
Secreted Protein shall be a Secreted Protein Candidate hereunder. If less than
[***] of the Steering

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Committee members vote affirmatively to designate a Secreted Protein as a
Secreted Protein Candidate or if the Steering Committee fails to vote
affirmatively within such [***] period to designate a Secreted Protein as a
Secreted Protein Candidate, then the Project Gene that produced such Secreted
Protein shall immediately become a Rejected Project Gene.

               5.5.2 DESIGNATION GUIDELINES. A Steering Committee member's
standard for voting to designate a Project Gene's Secreted Protein as a
"secreted protein candidate" shall be [***].

               5.5.3 [***] PROJECT GENE. Unless otherwise decided by the Parties
or the Steering Committee, any Project Gene which (i) the Steering Committee
members have voted to [***]," (ii) the Steering Committee members have not voted
[***] under this Agreement within [***] of its submission to the Steering
Committee pursuant to Section 5.5.1, and/or (iii) has been [***] Neither Party
shall [***] any of the [***].

                      5.5.3.1 DURING RESTRICTION TERM. If, during the
Restriction Term, either Party obtains [***] on a Rejected Project Gene, such
Party may present such Rejected Project Gene to the Steering Committee for
another vote on whether to designate such Rejected Project Gene as a Secreted
Protein Candidate. At the time of presentation of a Rejected Project Gene to the
Steering Committee, each of the Parties must disclose to the other Party the
[***] performed during the Restriction Term.

                      5.5.3.2 EXPIRATION OF RESTRICTION TERM. Upon expiration of
the Restriction Term for any Rejected Project Gene, each Party must disclose to
the other Party the [***] and the Steering Committee shall determine if such
Rejected Project Gene shall be further analyzed and studied under the
Development Program.

                      5.5.3.3 STEERING COMMITTEE VOTE ON REJECTED PROJECT GENE.
If the Steering Committee votes to return a Rejected Project Gene to the
Development Program, the license grants under Sections 2.1.3 and 2.3.1 shall
again become effective in accordance with their terms. If the Steering Committee
cannot reach an agreement on a Rejected Project Gene presented to it under this
Section 5.5.3, the Chief Executive Officers of the Parties shall make such
determination. If the Chief Executive Officers cannot reach an agreement on such
Rejected Project Gene, then such determination shall not be subject to the
dispute resolution procedure set

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forth in Section 13.5, but rather: (a) if DELTAGEN votes not to return such
Rejected Project Gene to the Development Program and HYSEQ votes to return such
Rejected Project Gene to the Development Program, then [***] or (b) if HYSEQ
votes not to return such Rejected Project Gene to the Development Program and
DELTAGEN votes to return such Rejected Project Gene to the Development Program,
then [***] If the Party that [***] pursuant to this Section 5.5.3.3 wishes to
[***], the Parties shall negotiate in good faith concerning [***].

                      5.5.3.4 MAINTENANCE OF PROJECT KNOCK-OUT MICE. If HYSEQ
desires to maintain the line of a Rejected Project Gene's Project Knock-Out
Mouse beyond the Restriction Term, it shall so notify DELTAGEN in writing prior
to the expiration of the Restriction Term. The Parties shall use good faith
efforts to agree upon an appropriate manner to preserve the Project Knock-Out
Mouse, its ES cells or frozen sperm sufficient to regenerate such Project
Knock-Out Mouse, at HYSEQ's sole cost and expense.

                      5.5.3.5 RIGHT OF FIRST REFUSAL. If, during the Restriction
Term, a Third Party approaches a Party ("Approached Party") and presents a
[***], such Approached Party shall [***]

                                    ARTICLE 6
                     COMMERCIALIZATION AND OTHER ACTIVITIES

        6.1 FURTHER RESEARCH AND DEVELOPMENT OF A SECRETED PROTEIN CANDIDATE.

               6.1.1 FURTHER DEVELOPMENT ACTIVITIES. Once a Secreted Protein
Candidate has been designated by the Steering Committee pursuant to Section 5.5,
the Steering Committee shall either modify the Work Plan, or create a separate
work plan, if and as may be appropriate, to outline the scope of development
activities and the responsibilities of the Parties with respect thereto and the
Parties shall enter into a separate agreement with respect to development and
commercialization of such Secreted Protein Candidate Product derived therefrom.
Unless otherwise decided by the Parties, the Parties shall [***] share all costs
(including FTEs) and out-of-pocket expenses associated with conducting such
research and development activities on a [***] basis, in accordance with the
procedures set forth in Section 6.1.2.

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               6.1.2 ACCOUNTING OF SHARED COST; AND REPORTS. All costs and
out-of-pocket expenses that are to be shared by the Parties on a [***] basis
pursuant to Section 3.1.2, ("Shared Costs") shall be reviewed by the Parties
each calendar quarter to determine the amount of Shared Costs incurred by each
Party for such calendar quarter hereunder. Within sixty (60) days of the end of
each calendar quarter (or as otherwise mutually agreed by the Parties), each
Party shall provide to the other Party and the Steering Committee a report
detailing the total Shared Costs incurred by it, with respect to Section 6.1.1
on a Secreted Protein Candidate-by-Secreted Protein Candidate basis and for
Products incorporating such Secreted Protein Candidate whose apportionment of
costs are not otherwise the subject of a separate agreement between the Parties
(or, if applicable, between a Party and its Affiliate and/or a Third Party), on
a Product-by-Product basis, and:

                      (a) if DELTAGEN incurred more than [***] of the total
Shared Costs for a calendar quarter, then DELTAGEN shall invoice HYSEQ for the
amount representing the difference between the percentage paid by DELTAGEN and
the [***] (the "HYSEQ Deficiency") and HYSEQ shall pay DELTAGEN the HYSEQ
Deficiency within thirty (30) days of its receipt of such invoice; or

                      (b) if HYSEQ incurred more than [***] of the total Shared
Costs for a calendar quarter, then DELTAGEN shall pay HYSEQ the amount
representing the difference between the percentage paid by HYSEQ and the [***]
(the "DELTAGEN Deficiency") within thirty (30) days of notifying HYSEQ of the
total Shared Costs incurred by the Parties. In the event there is a good faith
dispute over an amount owed by HYSEQ under this Section 6.1.2, the disputed
portion of the payment may be delayed, and such payment shall not be considered
delinquent pending a resolution of the Parties' dispute, other than with respect
to the terms and conditions of Section 13.7.

        6.2 COMMERCIALIZATION OF SECRETED PROTEIN CANDIDATES AND PRODUCTS. If
the Steering Committee decides not to conduct further development activities
with respect to a Secreted Protein Candidate or any Products identified by
either Party under the Development Program that utilize such Secreted Protein
Candidate, the Parties shall, through the Steering Committee, hold good faith
discussions to determine how, and whether, to proceed with further development

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       25

and/or commercialization of any such Secreted Protein Candidate (and/or any
identified Products that utilize such Secreted Protein Candidate), either
themselves or through or with any Affiliate and/or Third Parties. Any such
development and/or commercialization activities shall be conducted pursuant to
the terms and conditions of a separate agreement to be negotiated between the
Parties and any other relevant parties to such agreement(s). If the Parties
decide not to proceed under this Section 6.2, and if neither of the Parties
invokes the provisions of Section 6.3 below, then upon the expiration of the
[***] period provided for in Section 6.3.1 the applicable Project Gene shall
become a Rejected Project Gene under this Agreement.

        6.3 DEADLOCK.

               6.3.1 SUBMISSION OF TERM SHEET TO STEERING COMMITTEE. If the
Steering Committee is unable to agree on how to proceed with respect to a
Secreted Protein Candidate (or any Products identified by either Party under the
Development Program that utilize such Secreted Protein Candidate) pursuant to
Section 6.2 within [***] of first considering such Secreted Protein Candidate
(or its corresponding Product(s)), then within [***] of such DATE, each Party
may, if it so chooses, present to the Steering Committee a proposed term sheet
(a "Proposed Term Sheet") that sets out terms and conditions under which such
Party wishes to develop and commercialize such Secreted Protein Candidate
(and/or any Products identified by either Party under the Development Program
that utilize such Secreted Protein Candidate) which the submitting Party would
like to pursue itself or with or through an Affiliate and/or Third Party. Any
such Proposed Term Sheet submitted to the Steering Committee by a Party shall
include [***] and shall provide for [***]. The Steering Committee shall review
and consider any Proposed Term Sheet submitted by a Party [***]. If the Steering
Committee votes and approves a Party's Proposed Term Sheet, such Party is
authorized to negotiate an agreement based upon such Proposed Term Sheet, the
Party may proceed with such negotiations, but shall provide the Steering
Committee with a copy of the Agreement prior to signing for final review and
approval (such approval not to be unreasonably withheld or delayed). Subject to
any confidentiality obligations to which a Party may be bound, such Party shall
keep the Steering Committee updated with respect to such negotiations, if and as
reasonably requested by the Steering Committee. If at any time during the Term,
each Party agrees to submit a Proposed

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       26

Term Sheet to the Steering Committee under this Section 6.3.1, and the Steering
Committee rejects both, or does not approve either, Party's Proposed Term
Sheets, then either Party [***] upon written notice to the other Party. If only
one Party submits a Proposed Term Sheet to the Steering Committee, and the
Steering Committee rejects such Party's Proposed Term Sheet, or neither Party
submits a Proposed Term Sheet, then neither Party may [***] except as authorized
by the Steering Committee or as mutually agreed by the Parties in writing;
provided that if the Parties both agree at a later date to submit Proposed Term
Sheets to the Steering Committee covering the development and/or
commercialization of such Secreted Protein Candidate (or any Products that
utilize such Secreted Protein Candidate) under this Section, then the Parties
can at that time [***] on written notice to the other Party if the Steering
Committee rejects both, or does not approve either, Party's Proposed Term
Sheets.

               6.3.2 THIRD PARTY MEDIATION. Upon a Party's receipt of a notice
from the other Party initiating the mediation procedures under this Section, the
Parties shall meet to attempt in good faith to resolve this matter through
face-to-face negotiations between senior executives of HYSEQ and DELTAGEN,
including consideration of any Proposed Term Sheets. If the matter is not
resolved within thirty (30) days (or such other period of time mutually agreed
upon by the Parties) of commencing such face-to-face negotiations, or if the
Party against which a claim has been asserted refuses to attend such
negotiations or does not otherwise participate in such negotiations within
thirty (30) days (or such other period of time mutually agreed upon by the
Parties) from the date of notice of to the other Party under this Section 6.3.2,
then either Party may initiate the procedures set forth on Exhibit B upon notice
to the other Party.

                                    ARTICLE 7
                         REPRESENTATIONS AND WARRANTIES

        7.1 HYSEQ REPRESENTATIONS AND WARRANTIES. As of the Effective date and
during the Term (unless expressly stated in this Section 7.1), HYSEQ hereby
represents and warrants the following to DELTAGEN:

               7.1.1 HYSEQ is (i) a company duly organized, validly existing,
and in good standing under the laws of Nevada with its respective principal
place of business as indicated in the first paragraph of this Agreement; (ii)
duly qualified as a corporation and in good standing

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       27

under the laws of each jurisdiction where its ownership or lease of property or
the conduct of its business requires such qualification, where the failure to be
so qualified would have a material adverse effect on its financial condition or
its ability to perform its obligations hereunder; (iii) has the requisite
corporate power and authority and the legal right to conduct its business as now
conducted and hereafter contemplated to be conducted; (iv) has all necessary
licenses, permits, consents, or approvals from or by, and has made all necessary
notices to, all governmental authorities having jurisdiction, to the extent
required for such ownership and operation; and (v) is in compliance with its
certificate of incorporation and by-laws.

               7.1.2 The execution, delivery and performance of this Agreement
by HYSEQ and all documents to be delivered by HYSEQ hereunder: (i) are within
the corporate power of HYSEQ; (ii) have been duly authorized by all necessary or
proper corporate action; (iii) are not in contravention of any provision of the
certificate of incorporation or by-laws of HYSEQ; (iv) will not violate any law
or regulation or any order or decree of any court of governmental
instrumentality; (v) will not violate the terms of any indenture, mortgage, deed
of trust, lease, agreement, or other instrument to which HYSEQ is a party or by
which HYSEQ or any of its property is bound; and (vi) do not require any filing
or registration with or the consent or approval of, any governmental body,
agency, authority or any other Person, which has not been made or obtained
previously.

               7.1.3 This Agreement has been duly executed and delivered by
HYSEQ and constitutes a legal, valid and binding obligation of both HYSEQ,
enforceable against both and either of HYSEQ in accordance with its terms.

               7.1.4 Except as expressly provided on Exhibit D, (which may be
modified in accordance with the terms and conditions of this Agreement for a
particular Submitted Gene up until the time that information is submitted for a
Proposed Gene under Section 4.1.3), HYSEQ is the sole and exclusive owner of the
entire right, title and interest in and to the HYSEQ Patents and the HYSEQ
Know-How, free and clear of any liens or other encumbrances, and no other Person
(including any government or university) has any license, claim or other right
or interest in or to any HYSEQ Patents or the HYSEQ Know-How. The HYSEQ Patents
and the HYSEQ Know-How may be co-exclusively licensed to DELTAGEN hereunder, and
as contemplated

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       28

under Article 6 under a separate agreement to commercialize Secreted Protein
Candidate and/or Products, without payment of any royalty, fee or incurring any
other obligation to any other Person (including any government or university).

               7.1.5 HYSEQ has disclosed or made available to DELTAGEN, to the
extent of HYSEQ's actual knowledge, all information relevant to [***].

               7.1.6 HYSEQ has disclosed or made available to DELTAGEN, to the
extent of HYSEQ's actual knowledge, [***].

               7.1.7 HYSEQ has disclosed or made available to DELTAGEN, to the
extent of HYSEQ's actual knowledge, [***].

               7.1.8 HYSEQ is [***].

               7.1.9 Except as provided in the information under Section 4.1.3
submitted for a Proposed Gene pursuant to this Agreement, all of the research
and development work performed in connection with any of the HYSEQ Know-How or
any Submitted Gene, Proposed Genes (subject to any disclosures made by HYSEQ in
writing pursuant to Section 4.1.3 with respect to any such Proposed Gene), or
Project Genes prior to the Effective Date was [***] and was performed in
accordance with applicable law and in compliance with all applicable regulatory
requirements, and all such rights have been properly assigned to HYSEQ including
any and all rights of any consultants of HYSEQ.

               7.1.10 HYSEQ [***] to protect its proprietary and confidential
information, including requiring its , consultants and agents to be bound in
writing by obligations of confidentiality and non-disclosure, and requiring its
employees to assign to it any and all inventions and discoveries discovered by
such employees made within the scope of, and during their employment, and only
disclosing proprietary and confidential information to Third Parties pursuant to
written confidentiality and non-disclosure agreements.

               7.1.11 HYSEQ has not, up through and including the Effective
Date, [***].

        7.2 DELTAGEN REPRESENTATIONS AND WARRANTIES. As of the Effective date
and during the Term(unless expressly stated in this Section 7.2), DELTAGEN
hereby represents and warrants the following to HYSEQ:

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       29

               7.2.1 DELTAGEN is (i) a company duly organized, validly existing,
and in good standing under the laws of Delaware with its respective principal
place of business as indicated in the first paragraph of this Agreement; (ii)
duly qualified as a corporation and in good standing under the laws of each
jurisdiction where its ownership or lease of property or the conduct of its
business requires such qualification, where the failure to be so qualified would
have a material adverse effect on its financial condition or its ability to
perform its obligations hereunder; (iii) has the requisite corporate power and
authority and the legal right to conduct its business as now conducted and
hereafter contemplated to be conducted; (iv) has all necessary licenses,
permits, consents, or approvals from or by, and has made all necessary notices
to, all governmental authorities having jurisdiction, to the extent required for
such ownership and operation; and (v) is in compliance with its certificate of
incorporation and by-laws.

               7.2.2 The execution, delivery and performance of this Agreement
by DELTAGEN and all documents to be delivered by DELTAGEN hereunder: (i) are
within the corporate power of DELTAGEN; (ii) have been duly authorized by all
necessary or proper corporate action; (iii) are not in contravention of any
provision of the certificate of incorporation or by-laws of DELTAGEN; (iv) will
not violate any law or regulation or any order or decree of any court of
governmental instrumentality; (v) will not violate the terms of any indenture,
mortgage, deed of trust, lease, agreement, or other instrument to which DELTAGEN
is a party or by which DELTAGEN or any of its property is bound; and (vi) do not
require any filing or registration with or the consent or approval of, any
governmental body, agency, authority or any other Person, which has not been
made or obtained previously.

               7.2.3 This Agreement has been duly executed and delivered by
DELTAGEN and constitutes a legal, valid and binding obligation of both DELTAGEN,
enforceable against both and either of DELTAGEN in accordance with its terms.

               7.2.4 DELTAGEN [***] to protect its proprietary and confidential
information, including requiring its consultants and agents to be bound in
writing by obligations of confidentiality and non-disclosure, and requiring its
employees to assign to it any and all inventions and discoveries discovered by
such employees made within the scope of, and during

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       30

their employment, and only disclosing proprietary and confidential information
to Third Parties pursuant to written confidentiality and non-disclosure
agreements.

               7.2.5 DELTAGEN has not, up through and including the Effective
Date, [***].

                                    ARTICLE 8
                                 INDEMNIFICATION

        8.1 INDEMNIFICATION. Each Party agrees to indemnify and hold forever
harmless the other Party and its Affiliates and each of their agents, directors,
officers, employees, consultants, contractors and (sub)licensees from and
against any loss, damage, action, proceeding, cost, expense or liability
(including reasonable attorneys' fees) (collectively, "Loss") arising from or in
connection with any Third Party claim or action relating to or arising from (a)
the breach of any representation, warranty or covenant of the indemnifying Party
under this Agreement; or (b) the [***] of the indemnifying Party or any its
Affiliates or any of its or its Affiliates' agents, directors, officers,
employees, consultants, contractors and/or (sub)licensees.

        8.2 PROCEDURE. The indemnities set forth in this Article 8 are subject
to the condition that the Party seeking indemnity shall (a) promptly notify the
indemnified Party under Section 8.1 (the "Indemnifying Party") on being notified
or otherwise made aware of a suit, action or claim; (b) tender to the
Indemnifying Party control of any proceedings regarding such matter [***];
provided that the Indemnifying Party may not settle the suit or otherwise
consent to any judgment in such suit without the written consent of the
Indemnified Party [***]. The Indemnifying Party has no obligation hereunder in
connection with any settlement made without the Indemnifying Party's written
consent (provided that such consent was not unreasonably withheld). The
non-Indemnifying Party shall cooperate with the Indemnifying Party in the
defense of any Third Party claim, as reasonably requested by the Indemnifying
Party.

        8.3 LIMITATIONS ON LIABILITY. EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN
SECTION 8.1 WITH RESPECT TO THIRD PARTY CLAIMS, NEITHER PARTY SHALL BE LIABLE TO
THE OTHER FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES,
INCLUDING ANY LOSS OF PROFITS OR LOSS OF ANY BUSINESS OPPORTUNITY.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       31

        8.4 DISCLAIMERS.

               8.4.1 EXCEPT FOR THE WARRANTIES SET FORTH IN ARTICLE 7, NEITHER
PARTY MAKES ANY WARRANTIES HEREUNDER AND EXPRESSLY DISCLAIMS ALL WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING ANY WARRANTIES OF MERCHANTABILITY,
NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.

               8.4.2 WITHOUT LIMITING SECTION 8.4.1, HYSEQ HEREBY ACKNOWLEDGES
AND AGREES THAT THE PROJECT KNOCK-OUT MICE AND ANY DERIVATIVES OR PROGENY
THEREOF ARE PROVIDED "AS IS," WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED,
INCLUDING ANY WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. FURTHERMORE, DELTAGEN MAKES NO REPRESENTATION OR WARRANTY THAT THE USE
OF THE PROJECT KNOCK-OUT MICE AND ANY DERIVATIVES OR PROGENY THEREOF WILL NOT
INFRINGE, MISAPPROPRIATE OR OTHERWISE CONFLICT WITH ANY PATENT OR OTHER
PROPRIETARY RIGHTS OF ANY OTHER PERSON.

                                    ARTICLE 9
              CONFIDENTIALITY, PRESS RELEASES AND OTHER DISCLOSURES

        9.1 NONDISCLOSURE.

               9.1.1 During the Term and [***] thereafter without regard to the
means of termination, neither DELTAGEN nor HYSEQ shall use for any purpose other
than the purpose of this Agreement or reveal or disclose to any Third Party
information and materials disclosed by, or obtained from, the other Party
(whether prior to or during the Term), and which is marked as "Confidential" or
for information or materials disclosed or obtained orally or otherwise in a
non-written form, which is described or summarized in a writing identified as
"Confidential" and forwarded to the other Party within thirty (30) days of such
disclosure ("Confidential Information") without first obtaining the written
consent of the other Party, except (i) as required by law or court order
(subject to prior notification to the other Party and seeking redaction and
confidential treatment where available); (ii) as required in connection with any
filings made with,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       32

or by the disclosure policies of a stock exchange (subject to prior notification
to the other Party and seeking redaction and confidential treatment where
available); and (iii) as expressly permitted under this Agreement, including as
permitted under Section 10.3.5.

               9.1.2 The obligations of confidentiality set forth in this
Section 9.1 shall not apply to such information which (a) is or becomes a matter
of public knowledge, through no fault of the receiving Party; (b) is already
rightfully in the possession of the receiving Party without an obligation of
confidentiality at the time of disclosure, as reasonably evidenced by the
receiving Party; (c) is disclosed non-confidentially to the receiving Party by a
Third Party having lawful possession of such information and the right to do so;
or (d) is subsequently and independently developed by employees of the receiving
Party or Affiliates thereof without reference to or knowledge of the
Confidential Information disclosed, as reasonably evidenced by the receiving
Party. The Parties shall take reasonable measures to assure that no unauthorized
use or disclosure is made by others to whom access to such information is
granted.

               9.1.3 HYSEQ and DELTAGEN each agree to limit the disclosure of
any Confidential Information of the other Party received or obtained hereunder
to such of its Affiliates and its and its Affiliates' employees, consultants,
sublicensees permitted under Article 2 and agents, as are necessary to carry out
the provisions of this Agreement and who are likewise bound by written
obligations of confidentiality which are comparable to, or more stringent than,
the provisions of this Article 9. Each Party agrees to provide the other Party
with written notice of any such consultants, sublicensees, or agents.

        9.2 PRESS RELEASES AND PUBLIC ANNOUNCEMENTS. Neither Party shall
otherwise issue any press releases or other publicity materials, or make any
public announcements relating to the terms or conditions of this Agreement or
relating to the Development Program or any Confidential Information of the other
Party without the prior written consent of the other Party. This restriction
shall not apply to disclosures required by law or regulation, including as may
be required in connection with any filings made with, or by the disclosure
policies of a stock exchange (subject to prior notification to the other Party
and seeking redaction and confidential treatment where available).

        9.3 PUBLICATIONS AND PRESENTATIONS. Without limiting Section 9.2,
neither Party shall

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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make any publications or presentations relating to any Proposed Genes (unless
and until it is a Rejected Proposed Gene), Project Genes, Project Knockout Mice,
Project Murine Genes, Secreted Proteins, Derivative Proteins, Secreted Protein
Candidates or Products or otherwise relating to the Development Program or any
activities thereunder, including any of the results or data arising from the
activities conducted under Development Program or containing, disclosing or
relating to any Confidential Information of the other Party, without the other
Party's prior written consent.

        9.4 TERMINATION. The Parties agree that if this Agreement is terminated,
neither Party shall disclose to any Third Party [***] without the express
written consent of the other Party, and the Parties shall agree on statements
for public disclosure, such agreement not to be unreasonably withheld or
delayed. This restriction shall not apply to disclosures required by law or
regulation.

                                   ARTICLE 10
                              OWNERSHIP AND RIGHTS

        10.1 PROJECT INTELLECTUAL PROPERTY OWNERSHIP AND RIGHTS.

               10.1.1 All right, title and interest in and to all inventions,
discoveries, know-how, derivatives and improvements and other Technical
Information (whether or not patentable), conceived, made, created, invented or
developed solely by DELTAGEN in connection with the activities conducted under
the Development Program or otherwise in connection with this Agreement
(including in connection with the selection of the Project Genes pursuant to
Section 4.1) shall be solely owned by DELTAGEN ("DELTAGEN Project Intellectual
Property"). All right, title and interest in and to all inventions, discoveries,
know-how, derivatives and improvements and other Technical Information (whether
or not patentable), conceived, made, created, invented or developed solely by
HYSEQ in connection with the activities conducted in connection with the
Development Program or otherwise in connection with this Agreement (including in
connection with the selection of the Project Genes pursuant to Section 4.1)
shall be solely owned by HYSEQ ("HYSEQ Project Intellectual Property"). All
right, title and interest in and to all inventions, discoveries, know-how,
derivatives and improvements and other Technical Information (whether or not
patentable), conceived, made, created, invented or developed jointly

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       34

by DELTAGEN and HYSEQ in connection with the activities conducted in connection
with the Development Program or in otherwise connection with this Agreement
(including in connection with the selection of the Project Genes pursuant to
Section 4.1) shall be jointly owned by DELTAGEN and HYSEQ ("Joint Project
Intellectual Property"); provided, however, that Joint Project Intellectual
Property relating to the DELTAGEN Knock-Out Technology, including any methods or
processes relating thereto, shall be owned by, and shall vest solely in,
DELTAGEN and shall be deemed "DELTAGEN Project Intellectual Property". Patents
covering HYSEQ Project Intellectual Property shall be referred to as "HYSEQ
Project Patents" and shall be owned by, and shall vest in, HYSEQ and Patents
covering DELTAGEN Project Intellectual Property shall be referred to as
"DELTAGEN Project Patents" and shall be owned by and shall vest in, DELTAGEN.
Patents covering Joint Project Intellectual Property shall be referred to as
"Joint Project Patents" and shall be jointly owned by, and jointly vest in, the
Parties. The Parties hereby agree that [***] for a Rejected Project Gene they
shall make [***] of Joint Project Intellectual Property, including Joint Project
Patents. If the Parties cannot mutually agree on such [***], such Joint Project
Intellectual Property and Joint Project Patents shall remain jointly owned by
the Parties.

               10.1.2 Each Party shall [***] to advise the other Party and the
Steering Committee in writing of any Project Intellectual Property if and as it
arises under the Development Program.

               10.1.3 Notwithstanding Section 10.1.1, as between HYSEQ and
DELTAGEN, all HYSEQ's Technical Information and other of HYSEQ's rights in and
to the Proposed Genes that became Rejected Proposed Genes pursuant to Section
4.3 that were identified, or submitted to, the Steering Committee and/or
DELTAGEN pursuant to Section 4.1, shall be solely owned by and remain vested in,
HYSEQ.

        10.2 FURTHER ASSURANCES. Each Party shall execute, or cause to be
executed, any and all documentation, assignments, declarations, applications
and/or other instruments that may be reasonably necessary or desirable to effect
each Party's respective ownership rights as set forth in Section 10.1.1,
including each Party's respective rights in and to the Joint Project
Intellectual Property and the Joint Project Patents, as set forth in Section
10.1.1.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

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        10.3 PATENT PROSECUTION AND MAINTENANCE

               10.3.1 RESPONSIBLE PARTY AND COOPERATION. Each Party shall be
responsible for the preparation, filing, prosecution and maintenance of its
respectively solely owned Project Patents (each a "Responsible Party"). Unless
otherwise agreed pursuant to Article 6 or Section 10.1.1, DELTAGEN shall be
responsible for the preparation, filing, prosecution and maintenance of all
Joint Project Patents (in such case, the "Responsible Party"), provided that
DELTAGEN shall provide the Steering Committee with access to all drafts of
provisional and patent applications for such Joint Project Patents. Upon the
designation of a Project Gene as a Secreted Protein Candidate, the Parties will
use good faith efforts to include in the joint development agreement: (i) the
Responsible Party for prosecution of such Joint Project Patents; (ii) that the
Responsible Party shall consult with the other Party with respect to Patent
matters for which it is responsible under this Section 10.3; and (iii) that the
Parties shall meet (whether in person or by video or telephone conference) on a
regular basis to review and discuss, such matters. Without limiting the
foregoing, with respect to Deltagen Project Patents and Joint Project Patents,
DELTAGEN shall consult with HYSEQ as to where and when to file patent
applications which are included in the Patents for which it is responsible under
this Section, and concerning the preparation, filing, prosecution, maintenance,
and shall solicit HYSEQ's advice and provide HYSEQ with sufficient time prior to
DELTAGEN having to respond or take action with respect to any such preparation,
filing, prosecution, and maintenance of such matter, and shall take into account
HYSEQ's comments related thereto and incorporate or act on such comments if and
to the extent reasonable.

               10.3.2 PATENT FILING AND PROSECUTION; AND UPDATES. If either
Party identifies any invention covered by the HYSEQ Know-How or the Project
Intellectual Property for which it would like to seek patent protection, it
shall notify the other Party, and the Parties shall review and discuss the
filing of a patent application covering such invention. If, after such
discussion, the Responsible Party decides to file a patent application covering
any such inventions, it shall prepare a patent application and provide the other
Party with a copy of such draft application together with a preliminary
determination of inventors and scope of claims. Each Party shall advise the
other Party within [***] of receiving any substantive action or development in
the

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HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       36

prosecution of any patent application it is responsible for prosecuting pursuant
to this Section 10.3 (in particular any actions or developments concerning which
countries to continue prosecution of, questions of the scope, issuance or
rejection of, any interference involving, any such patent application or any
opposition to any such patent application or resulting patent).

               10.3.3 ELECTION NOT TO PROCEED. On a Patent-by-Patent basis, if a
Responsible Party, either prior or subsequent to filing any patent applications
for Project Patents, elects not to file, prosecute or maintain such patent
applications, or maintain any ensuing Project Patents, it shall notify the other
Party within [***] prior to allowing such Project Patent to lapse or become
abandoned or unenforceable, and the other Party may elect to prepare, file,
prosecute, maintain and enforce such Project Patent. Without limiting the
foregoing, if a Responsible Party plans to abandon any patent application in any
Territory relating to a Project Gene in a Project Patent, the Responsible Party
shall promptly notify the other Party, and shall not abandon such patent
application for [***] after such notification to allow the other Party, if it
chooses, to continue to prosecute such patent application solely at its own cost
and expense. The costs of filing, prosecuting, and maintaining any Project
Patent assumed by a Party pursuant to this Section 10.3.3 shall be the
responsibility of such Party (but only if and to the extent such Party, in its
sole discretion, decides to incur such costs), and shall not be considered a
Shared Patent Cost under Section 10.3.3(a).

                      (a) SHARED PATENT COSTS. Except for costs and expenses
incurred by a Party as set forth above in this Section 10.3.3, unless otherwise
mutually agreed by the Parties, all costs of prosecuting and maintaining Joint
Project Patents shall be shared [***] by the Parties on a [***] basis ("Shared
Patent Costs").

In the event there is a good faith dispute over an amount owed by either Party
under this Section 10.3.3(a), the disputed portion of the payment may be
delayed, and such payment shall not be considered delinquent pending a
resolution of the Parties' dispute other than with respect to the terms and
conditions of Section 13.7.

               10.3.4 REPORTS. The Party performing the prosecution of any
patent application under this Section 10.3 shall provide the other Party with a
report no less frequently than once every six (6) month period (or as otherwise
mutually agreed by the Parties) listing all such

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       37

patents and patent applications, identifying them by country and patent or
application number, and briefly describing the status thereof.

               10.3.5 OTHER COOPERATION AND ASSISTANCE. At the request of the
Party performing the prosecution of any patent application under this Section
10.3, the other Party shall cooperate, as reasonably requested, in connection
with the prosecution of all such patent applications. Each Party shall make
available to the other or its respective authorized attorneys, agents or
representatives such of its employees as the other Party in its reasonable
judgment deems necessary in order to assist such other Party with the
prosecution of such patents. Each Party shall sign or [***] have signed and
delivered at no charge to the other Party all legal documents reasonably
necessary in connection with such prosecution and maintenance. Without in any
way limiting anything contained in this Section 10.3, (a) HYSEQ shall act in
good faith to advise, and to consult with, DELTAGEN in connection with the
preparation and prosecution of the Patent applications included in the HYSEQ
Patents as they arise under this Agreement and to mutually seek with DELTAGEN
opportunities to prepare and file HYSEQ Patents, with the Parties goal being in
each instance [***]; and (b) DELTAGEN shall act in good faith to advise, and to
consult with, HYSEQ in connection with the preparation and prosecution of the
Patent applications included in the DELTAGEN Project Patents and Joint Project
Patents as they arise under this Agreement and to mutually seek with HYSEQ
opportunities to prepare and file DELTAGEN Project Patents and Joint Project
Patents, with the Parties' goal being in each instance [***]. Without limiting
the foregoing, HYSEQ may use any Project data and results generated from any
Project Knock-out Mouse, including data from the First Pass Phenotypic Analysis,
to support prosecution of HYSEQ Patents as reasonably necessary for such
prosecution, and such use of data and results will not be considered a violation
of the confidentiality provisions of Article 9 provided that such data and
results have already been incorporated into a patent application by DELTAGEN.

               10.3.6 HYSEQ AND DELTAGEN PROJECT PATENTS. For the avoidance of
doubt, as between DELTAGEN and HYSEQ, HYSEQ shall control all preparation,
filing, prosecution and maintenance of any and all HYSEQ Project Patents and/or
any Patents covering any HYSEQ Project Intellectual Property or HYSEQ Know-How,
and DELTAGEN shall control all

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       38

preparation, filing, prosecution and maintenance of any and all DELTAGEN Project
Patents and/or any Patents covering any DELTAGEN Project Intellectual Property
or any other Technical Information owned or controlled by DELTAGEN.

                                   ARTICLE 11
                              TERM AND TERMINATION

        11.1 TERM. The term of this Agreement (the "Term") shall commence as of
the Effective Date and, unless sooner terminated by mutual agreement or pursuant
to any other provision of this Agreement, shall terminate upon the later to
occur of: (a) the expiry of the last Valid Claim relating to a Project Gene or a
Secreted Protein Candidate within the HYSEQ Patents or Project Patents, or (b)
five (5) years from the Effective Date. Upon expiration of this Agreement, the
Parties shall have the licenses expressly provided for in Sections 2.1.3 and
2.3.1 of this Agreement.

        11.2 TERMINATION EVENTS.

               11.2.1 [***]. If HYSEQ commits a material breach of any term or
condition of this Agreement solely as a result of its failure [***], and HYSEQ
fails to cure such breach within [***] days after receiving written notice of
the breach from DELTAGEN, DELTAGEN may immediately terminate this Agreement in
its entirety upon written notice to HYSEQ at the end of such [***] day period
for the HYSEQ's uncured breach; provided, however, that in the event that the
[***] is the subject of a good faith dispute between the Parties, such dispute
shall be deemed as and treated as a Dispute (as such term is defined in Section
13.5.1) for the purposes of this Agreement and addressed by means of the dispute
resolution provisions of Section 13.5 and until such time as the board of
arbitrators, pursuant to Section 13.5, renders a final decision with respect to
such Dispute the Parties shall continue to perform their obligations hereunder,
except to the extent mutually agreed to by the Parties or as directed by the
arbitrators pursuant to Section 13.5.

               11.2.2 OTHER DEFAULTS. Except as set forth in Section 11.2.1, if
either Party commits a material breach of any term or condition of this
Agreement, the non-breaching Party may give the other Party written notice of
the breach, and if the breach is not cured within ninety (90) days after
receiving written notice of the breach, the non-breaching Party shall (i) have
the

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       39

right to terminate this Agreement upon written notice to the breaching Party;
and (ii) to submit the subject matter of the alleged breach to the dispute
resolution process pursuant to Section 13.5 within thirty (30) days of the end
of such ninety (90) day period by giving the other Party written notice
requesting arbitration within such thirty (30) day period. Unless this Agreement
is terminated by the non-breaching Party pursuant to this Section 11.2.2, the
Parties shall continue to perform their obligations hereunder during the
pendency of such arbitration, except to the extent mutually agreed otherwise by
the Parties or except as directed by the arbitrators. The arbitrators decision
shall be binding upon the Parties except that in no event shall the arbitrators
have the power or authority to terminate this Agreement, either in whole or in
part.

                                   ARTICLE 12
             EFFECT OF EXPIRATION AND TERMINATION; AND SURVIVABILITY

        12.1 [***].

        12.2 RETURN OF CONFIDENTIAL MATERIALS AND INFORMATION. Upon expiration
of this Agreement, upon the other Party's written request, each Party shall
either, as directed by the other Party, return to the other Party or certify in
writing to the other Party that it has destroyed all documents and other
tangible items provided by the other Party that contain or relate to
Confidential Information of the other Party (other than information that is
considered joint Confidential Information of both Parties), including abstracts
and summaries thereof; except if and to the extent, that the Parties have
otherwise expressly agreed in writing, including as the Parties may have agreed
pursuant to Article 6 with respect to the development and/or commercialization
of any Secreted Protein Candidate or any Products, either themselves, or through
or with any Affiliates or Third Parties.

        12.3 SURVIVABILITY. Expiration or termination of this Agreement shall
not affect each Party's obligations to pay any amount accruing to the other
Party under the provisions of this Agreement while it was in effect. Further,
the expiration or termination of this Agreement shall not affect any rights and
obligations of the Parties under this Agreement which survive such termination.
Without limiting the generality of the foregoing, the following provisions of
this Agreement shall survive expiration or termination hereof: Articles 1, 2
(only as expressly provided therein with respect to license grants that have not
terminated by their terms), 7, 8, 9,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       40

10, 12 and 13 and Section 5.5.3.3.

                                   ARTICLE 13
                                  MISCELLANEOUS

        13.1 FORCE MAJEURE. If either Party is prevented from complying, either
totally or in part, with any of the terms or provisions of this Agreement (other
than a payment obligation), by reason of force majeure, including, but not
limited to fire, flood, earthquake, explosion, storm, strike, lockout or other
labor trouble, riot, war, rebellion, accident, acts of God and/or any other
cause or externally induced casualty beyond its reasonable control, whether
similar to the foregoing matters or not, then, upon written notice by the Party
liable to perform to the other Party, the requirements of this Agreement or such
of its provisions as may be affected, and to the extent so affected, shall be
suspended during the period of such disability.

        13.2 NO ASSIGNMENT. Neither Party shall, without the prior written
consent (not to be unreasonably withheld) of the other Party having been
obtained, assign or transfer this Agreement, or any right or obligation under
this Agreement, to any Person; provided, however, that each Party may assign or
transfer this Agreement to any successor by merger of such Party, or upon a sale
of all or substantially all of such Party's assets without the prior written
consent of the other Party hereto. This Agreement shall be binding upon and
shall inure to the benefit of the Parties and their successors and permitted
assigns.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       41

        13.3 NOTICES. Any notices required or permitted to be given hereunder
shall be in writing in the English language and shall be delivered in person or
by Federal Express (or other courier service requiring signature upon receipt)
or sent by air mail, postage prepaid, or facsimile (confirmed by a telephone
conversation with the recipient) to the addresses set forth below. The Parties
may change the address at which notice is to be given by giving notice to the
other Party as herein provided. All notices shall be deemed effective upon
receipt by the Party to whom it is addressed.

               If to HYSEQ:

               Hyseq Inc.
               670 Almanor Avenue
               Sunnyvale, California  94085-3513
               Attention:  President & CEO
               cc: General Counsel, at the same address
               Fax:        (408) 524-8145
               Phone:      (408) 524-8100

               If to DELTAGEN:

               Deltagen Inc.
               740 Bay Road
               Redwood City, CA 94063-2469

               Attention:  President
               cc: General Counsel, at the same address
               Fax:        (650) 569-5280
               Phone:      (650) 569-5100

        13.4 GOVERNING LAW. This Agreement and its execution, validity and
interpretation shall be interpreted in accordance with and governed in all
respects in accordance with the laws of the State of California, and all rights
and remedies shall be governed by such laws without regard to principles of
conflicts of law. Subject to Section 13.5, the Parties hereby consent to the
exclusive personal jurisdiction and venue of the Superior Court of the County of
Santa Clara in the State of California or, as applicable, the United States
District Court for the Northern District of California, for all matters arising
under or in connection with this Agreement.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       42

        13.5 DISPUTE RESOLUTION.

               13.5.1 The Parties shall initially attempt in good faith to
resolve any significant controversy, claim, or dispute arising out of or
relating to this Agreement or any significant breach thereof (hereinafter
collectively referred to as a "Dispute") through face-to-face negotiations
between senior executives of HYSEQ and DELTAGEN. If the Dispute is not resolved
within thirty (30) days (or such other period of time mutually agreed upon by
the Parties) of commencing such face-to-face negotiations, or if the Party
against which a claim has been asserted refuses to attend such negotiations or
does not otherwise participate in such negotiations within thirty (30) days (or
such other period of time mutually agreed upon by the Parties) from the date of
notice of a Dispute, then the Parties agree to submit the Dispute to arbitration
as provided herein. Unless otherwise mutually agreed by the Parties, only if the
Dispute is not resolved through face-to-face negotiations as set forth in this
Section 13.5.1, may a Party resort to arbitration.

               13.5.2 Except as provided in Section 13.5.1 and Sections 3.3.4
and 6.3, all Disputes relating in any way to this Agreement shall be resolved
exclusively through arbitration conducted under the auspices of the American
Arbitration Association (the "AAA") pursuant to its Commercial Dispute
Resolution Procedures; provided, however, that any disputes between the Parties
concerning the infringement or validity of any intellectual property right
subject to this Agreement shall be heard by a court of competent jurisdiction.
The arbitration shall be conducted in the English language before three (3)
arbitrators, one selected by each Party and the third to be selected by the
other two. For any Dispute arising out of a non-concurrence of the Steering
Committee such arbitrators shall have the appropriate technical and scientific
background. Unless otherwise mutually agreed by the Parties, any arbitration
brought hereunder shall be brought only and exclusively in the State of
California. The arbitrators shall hear evidence by each Party and resolve each
of the issues identified by the Parties. The arbitrators shall render a formal,
binding non-appealable resolution and award on each issue as expeditiously as
possible, but not more than fifteen (15) business days after the hearing. In any
arbitration, the prevailing Party shall be entitled to reimbursement of its
reasonable attorneys' fees and the Parties shall use all reasonable efforts to
keep arbitration costs to a minimum.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       43

               13.5.3 Notwithstanding anything contained herein, in no event
shall arbitrators have the power or authority to terminate this Agreement in
whole or in part.

               13.5.4 Nothing in this Agreement shall be deemed as preventing
either Party from seeking injunctive relief (or any other provisional remedy)
from any court having jurisdiction over the Parties and the subject matter of
the dispute as necessary to protect either Party's intellectual property.

        13.6 LICENSE SURVIVAL DURING BANKRUPTCY. All rights and licenses granted
under or pursuant to this Agreement are, and shall otherwise be deemed to be,
for purposes of Paragraph 365(n) of the U.S. Bankruptcy Code, licenses of rights
to "intellectual property" as defined under Paragraph 101(35A) of the U.S.
Bankruptcy Code. The Parties agree that each Party, as a licensee of such rights
under this Agreement, shall retain and may fully exercise all of its rights and
elections under the U.S. Bankruptcy Code, subject to performance by the other
Party of its preexisting obligations under this Agreement. The Parties further
agree that, in the event of the commencement of a bankruptcy proceeding by or
against a Party, including under the U.S. Bankruptcy Code, the other Party shall
be entitled to a complete duplicate of (or complete access to, as appropriate)
any such intellectual property, and all embodiments of such intellectual
property, shall be promptly delivered to the other Party upon any such
commencement of a bankruptcy proceeding upon written request therefor by the
other Party.

        13.7 INTEREST. The Parties shall pay interest on any amounts overdue
under this Agreement at a rate of the lesser of the maximum allowed by
applicable law or [***] above the U.S. dollar prime or equivalent rate quoted by
Citibank N.A. or another mutually acceptable bank, as in effect during the
period from the date due until payment, including from the date any amounts
disputed in good faith by the Parties were originally due and payable hereunder.
This Section 13.7 shall apply to any amounts either Party may dispute under this
Agreement for any reason, even disputes initiated in good faith; provided,
however, that such amounts shall not be due and payable if a final decision by a
court of competent jurisdiction or AAA under Section 13.5 is rendered in favor
of the Party withholding the payment and such final decision declares such
disputed amounts not due under this Agreement.

        13.8 INTERPRETATION. The parties hereby acknowledge and agree that they
each

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       44

required that this Agreement and all documents and notices in connection
herewith be drawn up in English. This Agreement shall be deemed to comprise the
language mutually chosen by the Parties, has been prepared jointly and no rule
of strict construction shall be applied against either Party. In this Agreement,
the singular shall include the plural and vice versa and the word "including"
shall be deemed to be followed by the phrase "without limitation".

        13.9 SEVERABILITY. In the event that any provision of this Agreement
shall be held to be unenforceable, invalid or in contravention of applicable
law, such provision shall be of no effect, and the Parties shall negotiate in
good faith to replace such provision with a provision which effects to the
extent possible the original intent of such provision.

        13.10 COMPLETE AGREEMENT. This Agreement, including all Exhibits hereto,
supersedes all prior understandings, agreements, representations and warranties
between the Parties, oral or written with respect to the present subject matter,
and comprises the complete agreement between the Parties with respect to the
present subject matter.

        13.11 MODIFICATIONS. No terms or provisions of this Agreement shall be
varied or modified by any prior or subsequent statement, conduct or act of
either of the Parties, except that the Parties may amend this Agreement by
written instruments specifically referring to this Agreement and executed by a
duly authorized officer of each of the Parties.

        13.12 NO AGENCY. Neither Party shall by virtue of this Agreement have
any power to make on behalf of the other Party any statements, representations
or commitments of any kind or to bind the other to any obligation nor shall this
Agreement create any relationship of agency, partnership or joint venture or any
fiduciary relationship between the Parties.

        13.13 NO WAIVER. No term or condition of this Agreement shall be
considered waived unless reduced to writing and duly executed by a duly
authorized officer of the waiving Party. Any waiver by any Party of a breach of
any term or condition of this Agreement will not be considered as a waiver of
any subsequent breach of this Agreement, of that term or condition or any other
term or condition hereof.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       45

        13.14 COUNTERPARTS. The Agreement may be executed simultaneously in one
or more counterparts, each one of which need not contain the signature of more
than one Party but such counterparts taken together shall constitute one and the
same agreement.

                                *   *   *   *   *

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                       46

        IN WITNESS WHEREOF, the Parties have executed this Agreement as of the
date first above written.

HYSEQ, INC.                                  DELTAGEN INC.

By: /s/ Ted W. Love                          By: /s/ John Burke
   --------------------------------             --------------------------------

Name:  Ted W. Love                           Name:  John Burke
      -----------------------------                -----------------------------

Title: President and CEO                     Title: V.P. Intellectual Property
      -----------------------------                 ----------------------------

Date:     10/9/01                            Date:     10/9/01
      -----------------------------                -----------------------------

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                    EXHIBIT A

                                      [***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                      A - 1

                                    EXHIBIT B

                             SECTION 6. 3 MEDIATION

                                      [***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                      B - 1

                                    EXHIBIT C

                                    Work Plan

[***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                      C - 1

                                    EXHIBIT D

                                   DISCLOSURES

                                      [***]

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                      D - 1

                                                                   EXHIBIT 10.19

                            LINE OF CREDIT AGREEMENT

        THIS LINE OF CREDIT AGREEMENT (the "Agreement"), is entered into as of
the 6th day of August, 2001, by and between Hyseq, Inc., a Nevada corporation
("Borrower"), and Dr. George B. Rathmann ("Lender").

                                     RECITAL

        Borrower desires to obtain from Lender a line of credit (the "Line of
Credit"), making available to Borrower a principal amount of twenty million
dollars ($20,000,000).

                                    AGREEMENT

        NOW, THEREFORE, Lender and Borrower hereby agree as follows:

                                   ARTICLE I.

                                 LINE OF CREDIT

        1.1 ADVANCES. SUBJECT TO THE TERMS AND CONDITIONS OF THIS AGREEMENT,
LENDER HEREBY AGREES TO MAKE ADVANCES (EACH, AN "ADVANCE", AND COLLECTIVELY, THE
"ADVANCES"), TO BORROWER FROM TIME TO TIME UP TO AND INCLUDING AUGUST 5, 2003.
THE AGGREGATE AMOUNT OF ALL OUTSTANDING ADVANCES SHALL NOT EXCEED TWENTY MILLION
DOLLARS ($20,000,000) (THE "CREDIT LIMIT"). PROCEEDS OF ADVANCES SHALL BE USED
FOR WORKING CAPITAL AND GENERAL CORPORATE PURPOSES OF BORROWER.

        1.2 Borrowing and Repayment. Borrower may from time to time during the
term of this Agreement borrow, partially or wholly repay its outstanding
borrowings, and reborrow; provided however, that the total outstanding Advances
shall not at any time exceed the Credit Limit. Each time Borrower desires an
Advance, Borrower shall submit to Lender a drawing request in substantially the
form of Exhibit B attached hereto ("Drawing Request"), setting forth the amount
requested to be borrowed. Borrower may submit Drawing Requests no more
frequently than once each week.

        1.3 Promissory Note. Borrower's obligation to repay the Advances and
accrued interest thereon shall be evidenced by a convertible promissory notice
substantially in the form attached hereto as Exhibit A (the "Note"), which may
be converted by mutual agreement of Lender and Borrower into shares of
Borrower's common stock, par value $0.001 per share (the "Common Stock"), at any
time up to and including the Maturity Date (as defined in Section 1.7 herein).
The shares of Common Stock to be issued upon the conversion of the Note are the
"Note Shares". Borrower shall execute and deliver to Lender the Note
concurrently with the execution and delivery of this Agreement. Borrower
authorizes Lender to record on the schedule annexed to the Note, the date and
amount of each Advance made by Lender, the Prime Rate (as defined in Section 1.4
herein) when each Advance is made, and each payment or prepayment of the
Advances, and agrees that all such notations shall constitute prima facie
evidence of the matters noted. Borrower further authorizes Lender to attach to
and make a part of the Note continuations of the schedule as necessary. No
failure to make any such notations, nor any errors in making any such notations,

shall affect the validity of Borrower's obligations to repay the Advances or
Borrower's obligations under any of the Loan Documents (as defined in Section
2.1 herein).

        1.4 INTEREST AND FEES. Subject to Section 1.5, the outstanding principal
balance of the Line of Credit shall bear interest at a rate per annum equal to
one percent (1%) above the Prime Rate in effect from time to time. The term
"Prime Rate" shall mean at any time the rate of interest most recently announced
by Bank of America National Trust and Savings Association (or such other
financial institution as may be designated by Lender with Borrower's consent,
which consent will not be unreasonably withheld) (the "Reference Bank"), as its
Prime Rate. Each change in the rate of interest shall become effective on the
date each Prime Rate change is announced by the Reference Bank.

        1.5 Default Interest. At all times when an Event of Default has occurred
and is continuing, the outstanding principal balance of the Line of Credit shall
bear interest at a rate per annum equal to two percent (2%) above the Prime Rate
in effect from time to time (the "Default Rate"). In addition, to the extent
permitted by applicable law, any interest payments, fees or other amounts owed
hereunder and not paid when due, in each case whether at stated maturity, by
notice of prepayment, by acceleration or otherwise, shall bear interest at the
Default Rate. Payment or acceptance of the Default Rate is not a permitted
alternative to timely payment and shall not constitute a waiver of any Event of
Default or otherwise prejudice or limit any rights or remedies of Lender.

        1.6 Expiration Date. The Line of Credit shall expire, and Lender shall
have no further obligation to make any Advances to Borrower upon the earlier of
(i) a Change of Control, or (ii) August 5, 2003, the "Expiration Date". The
passage of the Expiration Date does not affect Borrower's repayment obligation.
For purposes of this Section 1.6, a "Change of Control" means (i) Borrower's
sale of all or substantially all of its assets, or (ii) any transaction or
series of related transactions to which Borrower is a party (including, without
limitation, any reorganization, merger or consolidation) that will result in the
holders of Borrower's outstanding voting equity securities immediately prior to
such transaction holding fewer than fifty per cent (50%) of the voting equity
securities of the surviving entity immediately following such transaction(s).

        1.7 Computation and Repayment. Borrower shall pay to the order of
Lender, at any place which Lender designates from time to time in writing, in
lawful money of the United States of America, the principal amount of the
Advances and accrued interest thereon. Interest on the principal amount
outstanding under the Advances shall be computed on the basis of a 360-day year,
actual days elapsed. Except as otherwise set forth in this Agreement, the
outstanding principal amount of the Advances on the Expiration Date shall be
repaid in forty eight (48) equal monthly installments, beginning on the
Expiration Date, and continuing on the first business day of each successive
calendar month until paid in full. Any and all outstanding principal amount,
accrued interest and applicable fees, costs and charges, if any, shall be paid
in full to Lender on the date which is forty eight (48) months after the
Expiration Date, the "Maturity Date".

        1.8 Limitation on Repayment by Note Shares. Notwithstanding any term to
the contrary contained in any of the Loan Documents, Borrower may not repay
Advances, interest accrued thereon and any attendant costs, fees and charges in
the form of Note Shares in excess of an aggregate value of twenty million
dollars ($20,000,000).

                                       2

        1.9 Application of Payments. Lender shall apply all payments received
from Borrower pursuant to this Agreement as follows: first, to the payment of
applicable fees, costs and charges, if any; second, to accrued and unpaid
interest then due and owing; and third, to the outstanding principal amount of
the Advances.

                                   ARTICLE II.

                                   BORROWER'S
                         REPRESENTATIONS AND WARRANTIES

        Borrower makes the following representations and warranties to Lender,
which representations and warranties shall survive the execution of this
Agreement and shall continue in full force and effect until the full and final
payment, and satisfaction and discharge of all obligations of Borrower to
Lender, subject to this Agreement.

        2.1 AUTHORIZATION AND VALIDITY. This Agreement, the Note, and each other
document, contract and instrument required by or at any time delivered to Lender
in connection with this Agreement (collectively, the "Loan Documents"), have
been duly authorized by Borrower, and upon their execution and delivery in
accordance with the provisions hereof will constitute legal, valid and binding
agreements and obligations of Borrower, enforceable in accordance with their
respective terms, except as limited by bankruptcy, insolvency, reorganization,
moratorium or similar laws affecting creditors' rights generally.

        2.2 NO VIOLATION. The execution, delivery and performance by Borrower of
each of the Loan Documents to which it is a party do not violate any provision
of any law or regulation, or contravene any provision of Borrower's Amended and
Restated Articles of Incorporation, as amended or Amended Bylaws, or will not
result in a breach of or constitute a default under any contract, obligation,
indenture or other instrument to which Borrower is a party or by which Borrower
or any of its properties may be bound.

        2.3 Litigation. Except as disclosed to Lender, there is no action,
proceeding or investigation pending or threatened, or any basis therefor known
to Borrower, that questions the validity of this Agreement or the right of
Borrower to enter into this Agreement, or that would have, either individually
or in the aggregate, a Material Adverse Effect. "Material Adverse Effect" shall
mean a material adverse effect upon Borrower's business, operation, properties,
assets or condition (financial or otherwise). There is no judgment, decree or
order of any court in effect against Borrower, and Borrower is not in default
with respect to any order of any governmental authority to which Borrower is a
party or by which Borrower is bound.

        2.4 Governmental Consent. No consent, approval, order or authorization
of, or registration, qualification, designation, declaration or filing with, any
federal, state or local governmental authority on the part of Borrower is
required in connection with the consummation of the transactions contemplated by
this Agreement.

        2.5 No Events of Default. Except as disclosed to Lender, Borrower is not
in default under any debt or material obligation of Borrower and no event has
occurred which would become

                                       3

an event of default under any such debt or material obligation with or without
the giving of notice, the lapse of time, or both.

        2.6 Existence and Authority. Borrower is a corporation duly organized
and validly existing under the laws of the State of Nevada. Borrower has the
corporate power and authority, rights and franchises to own its properties and
to carry on its business as now conducted. Borrower has the corporate power and
authority to borrow the Advances and to enter into and perform its obligations
under this Agreement and the other Loan Documents.

                                  ARTICLE III.

                                    LENDER'S
                         REPRESENTATIONS AND WARRANTIES

        Lender makes the following representations and warranties to Borrower,
which representations and warranties shall survive the execution of this
Agreement and shall continue in full force and effect until the full and final
payment, and satisfaction and discharge of all obligations of Lender to
Borrower, subject to this Agreement.

        3.1 Lender hereby represents and warrants to Borrower as follows:

               (a) Lender understands and acknowledges that the offering and
sale of the Note Shares pursuant to the Note will not be registered under the
Securities Act of 1933, as amended (the "Securities Act".

               (b) Lender covenants that in no event will he make any
disposition of any of the Note Shares, except in accordance with an effective
registration statement under the Securities Act, or Rule 144 (or any successor
rule) as promulgated thereunder.

               (c) Lender acknowledges and understands that the Note Shares must
be held indefinitely unless they are subsequently registered under the
Securities Act or an exemption from such registration is available, and that
Borrower is under no obligation to register the Note Shares.

               (d) Lender represents that he is an "accredited investor" as such
term is defined in Regulation D promulgated under the Securities Act.

                                   ARTICLE IV.

                              CONDITIONS PRECEDENT

        The obligation of Lender to make any Advances to Borrower under this
Agreement is subject to satisfaction of the conditions precedent of Section 4.1
and 4.2.

        4.1 Documentation. LENDER SHALL HAVE RECEIVED, IN FORM AND SUBSTANCE
SATISFACTORY TO LENDER, THIS AGREEMENT, THE NOTE, A DRAWING REQUEST AND SUCH
OTHER DOCUMENTS AND INSTRUMENTS AS LENDER MAY REASONABLY REQUEST, ALL DULY
EXECUTED BY BORROWER.

                                       4

        4.2 Conditions to Each Advance. AS OF THE DATE OF EACH DRAWING REQUEST,
EXCEPT AS DISCLOSED TO LENDER:

               (a) all of Borrower's representations and warranties contained in
this Agreement shall be true, correct and complete in all material respects to
the same extent as though made on and as of that date;

               (b) no Event of Default (as defined in Section 6.1) shall have
occurred and shall continue, or shall result from, making the Advance;

               (c) no law or regulation shall prohibit, and no order, judgment
or decree of any court, arbitrator or governmental authority shall purport to
enjoin or restrain Lender from making the Advance; and

               (d) no change having a Material Adverse Effect on Borrower,
either individually or in the aggregate, shall have occurred since the date of
this Agreement.

        4.3 Conditions to Issuance of Note Shares. The obligation of Borrower to
issue the Note is subject to satisfaction of the condition precedent of this
Section 4.3. As of the date of the issuance of the Note Shares all of Lender's
representations and warranties contained in this Agreement shall be true,
correct and complete in all material respect to the same extent as though made
on and as of that date.

                                   ARTICLE V.

                              AFFIRMATIVE COVENANTS

        Borrower covenants that so long as any of the Advances, or any portion
thereof, remain outstanding or any liabilities (whether direct or contingent,
liquidated or unliquidated) of Borrower to Lender under any of the Loan
Documents remain outstanding, and until payment in full of all obligations of
Borrower subject hereto, Borrower shall:

        5.1 PUNCTUAL PAYMENTS. Pay the principal amount of the Advances,
interest, fees, charges or other liabilities due to Lender under the Loan
Documents at or before the times, at the place and in the manner specified in
the Loan Documents.

        5.2 Accounting Records. Maintain adequate books and records in
accordance with generally accepted accounting principles consistently applied
and in a manner otherwise acceptable to Lender, and permit any representative of
Lender, at any reasonable time, to inspect, audit and examine such books and
records, to make copies of the same, and to inspect the properties of Borrower.

        5.3 Compliance With Laws. Comply with the requirements of all laws,
rules, regulations and orders of any governmental authority applicable to
Borrower or its business.

                                       5

        5.4 Performance and Compliance with Other Agreements. Perform and comply
in all material respects with each of the provisions of each material indenture,
contract and other agreement by which Borrower or any of its properties is
bound.

        5.5 Taxes and Other Liabilities. Pay and discharge when due any and all
indebtedness, obligations, assessments and taxes, both real or personal and
including federal and state income taxes, which in the aggregate the nonpayment
of which would have a Material Adverse Effect, except such as Borrower may in
good faith contest or as to which a bona fide dispute may arise, so long as
provision is made to the satisfaction of Lender for eventual payment thereof if
it is found that payment is an obligation of Borrower.

        5.6 Notices of Lender. Within ten (10) days after Borrower has actual
knowledge of the occurrence of each such event or matter, give written notice to
Lender of: (i) the occurrence of any Event of Default (defined below), or any
condition, event or act which would become an Event of Default with or without
the giving of notice; or (ii) the commencement, or threatened commencement in
which Borrower has received written notice, of any litigation, arbitration or
other proceeding against Borrower which could result in a Material Adverse
Effect.

                                   ARTICLE VI.

                                EVENTS OF DEFAULT

        6.1 The occurrence of any of the following shall constitute an "Event of
Default" under this Agreement:

               (a) Borrower shall fail to pay within five (5) business days of
the date due any principal, interest, fees or other amounts payable under any of
the Loan Documents.

               (b) Any financial statement or certificate furnished to Lender in
connection with this Agreement or any representation or warranty made or deemed
made by Borrower hereunder shall prove to be false, incorrect or incomplete in
any material respect when furnished, made or deemed made.

               (c) Any default in the performance of or compliance with any
obligation, agreement or other provision contained herein (other than those
referred to in Sections 6.1(a) and (b) above), and with respect to any such
default which by its nature can be cured, such default shall continue for a
period of twenty (20) days from its occurrence.

               (d) Any material default in the payment or performance of any
material obligation, or any defined event of default, under the terms of any
contract or instrument (other than the Loan Documents), pursuant to which
Borrower has incurred any debt or other liability to any person or entity,
including Lender.

               (e) Any default in the payment or performance of any obligation,
or any defined event of default, under any of the Loan Documents other than this
Agreement.

               (f) Borrower shall become insolvent, or shall suffer or consent
to or apply for the appointment of a receiver, trustee, custodian or liquidator
of itself or any of its property, or shall

                                       6

generally fail to pay its debts as they become due, or shall make a general
assignment for the benefit of creditors; Borrower shall file a voluntary
petition in bankruptcy, or seeking reorganization, in order to effect a plan or
other arrangement with creditors or any other relief under the Bankruptcy Reform
Act, Title 11 of the United States Code, as amended or recodified from time to
time or any successor statute ("Bankruptcy Code"), or under any state or federal
law granting relief to debtors, whether now or hereafter in effect; or any
involuntary petition or proceeding pursuant to said Bankruptcy Code or any other
applicable state or federal law relating to bankruptcy, reorganization or other
relief for debtors is filed or commenced against Borrower, or Borrower shall
file an answer admitting the jurisdiction of the court and the material
allegations of any involuntary petition; or shall be adjudicated a bankrupt, or
an order for relief shall be entered by any court of competent jurisdiction
under said Bankruptcy Code or any other applicable state or federal law relating
to bankruptcy, reorganization or other relief for debtors.

        6.2 ACCELERATION. If an Event of Default shall occur, (a) any
indebtedness of Borrower under any of the Loan Documents, any term thereof to
the contrary notwithstanding, shall (at Lender's option and without notice)
become immediately due and payable without presentment, demand, protest or
notice of dishonor, all of which are hereby expressly waived by Borrower; (b)
the obligation, if any, of Lender to permit further borrowings hereunder shall
immediately cease and terminate; and (c) Lender shall have all rights, powers
and remedies available under each of the Loan Documents, or accorded by law,
including without limitation the right to resort to any or all security for any
of the Advances and to exercise any or all of the rights of a beneficiary or
secured party pursuant to applicable law. All rights, powers and remedies of
Lender in connection with each of the Loan Documents may be exercised at any
time by Lender and from time to time after the occurrence of an Event of
Default, are cumulative and not exclusive, and shall be in addition to any other
rights, powers or remedies provided by law or equity. Notwithstanding the
foregoing, the occurrence of an Event of Default shall not extinguish Borrower's
right to convert any amount owed to Lender into the Note Shares, as provided for
in Section 1.3 herein.

                                  ARTICLE VII.

                               GENERAL PROVISIONS

        7.1 NO WAIVER. No delay, failure or discontinuance of Lender in
exercising any right, power or remedy under any of the Loan Documents shall
affect or operate as a waiver of such right, power or remedy; nor shall any
single or partial exercise of any such right, power or remedy preclude, waive or
otherwise affect any other or further exercise thereof or the exercise of any
other right, power or remedy. Any waiver, permit, consent or approval of any
kind by Lender of any breach of or default under any of the Loan Documents must
be in writing and shall be effective only to the extent expressly set forth in
such writing.

                                       7

        7.2 NOTICES. All notices, requests and demands which any party is
required or may desire to give to any other party under any provision of this
Agreement must be in writing delivered to each party at the following addresses:

        BORROWER:       Hyseq, Inc.
                        670 Almanor Avenue
                        Sunnyvale, California 94085
                        Facsimile:  (408) 524-8145
                        Attn: Legal Department

        LENDER:         Dr. George B. Rathmann
                        5404 Lake Washington Blvd., N.E., Apt. I
                        Kirkland, Washington  98033

or to such other address as any party may designate by written notice to all
other parties. Each such notice, request and demand shall be deemed given or
made as follows: (a) if sent by hand delivery, upon delivery; (b) if sent by
overnight courier, upon the earlier to the date of receipt or two (2) days after
delivery to the courier; (c) if sent by mail, upon the earlier of the date of
receipt or five (5) days after deposit in the U.S. mail, first class and postage
prepaid; or (d) if sent by telecopy, upon receipt.

        7.3 INDEMNITY, COSTS, EXPENSES AND ATTORNEYS' FEES. Borrower shall
indemnify Lender against, hold Lender harmless from, and pay to Lender
immediately upon demand, the full amount of all costs and expenses, including
reasonable attorneys' fees, incurred by Lender in connection with (a) Lender's
administration of this Agreement and each of the other Loan Documents, and the
preparation of this Agreement and the other Loan Documents and any amendments
and waivers hereto and thereto, (b) the enforcement of Lender's rights and/or
the collection of any amounts which become due to Lender under any of the Loan
Documents (including in connection with any bankruptcy, reorganization,
"work-out" or similar circumstance or proceeding), and (c) the prosecution or
defense of any claim or action in any way related to any of the Loan Documents
or the transactions contemplated thereby, including without limitation any
action for declaratory relief.

        7.4 Successors; Assignment. This Agreement shall be binding on and inure
to the benefit of the heirs, executors, administrators, legal representatives,
successors and assigns of the parties; provided however, that Borrower may not
assign or transfer its interest hereunder without the prior written consent of
Lender. Lender reserves the right to sell, assign, transfer, negotiate or grant
participations in all or any part of, or any interest in, Lender's rights and
benefits under this Agreement, the Note and each of the other Loan Documents. In
connection therewith, Lender may disclose all documents and information which
Lender now has or may hereafter acquire relating to any of the Advances,
Borrower or its business, or any collateral required hereunder or granted in
connection herewith.

        7.5 Entire Agreement; Counterparts; Amendment. This Agreement and each
of the other Loan Documents constitute the entire agreement between Borrower and
Lender with respect

                                       8

to the Advances and supersede all prior negotiations, communications,
discussions and correspondence concerning the subject matter hereof. This
Agreement may be executed in any number of counterparts and may be amended or
modified only by a written instrument executed by each party hereto.

        7.6 No Third Party Beneficiaries. This Agreement is made and entered
into for the sole protection and benefit of the parties hereto and their
respective permitted successors and assigns, and no other person or entity shall
be a third party beneficiary of, or have any direct or indirect cause of action
or claim in connection with, this Agreement or any other of the Loan Documents
to which it is not a party.

        7.7 Severability of Provisions. If any provision of this Agreement shall
be prohibited by or invalid under applicable law, such provision shall be
ineffective only to the extent of such prohibition or invalidity without
invalidating the remainder of such provision or any remaining provisions of this
Agreement.

        7.8 Governing Law. This Agreement shall be governed by and construed in
accordance with the internal laws of the State of California, except to the
extent that Lender has greater rights or remedies under federal law, in which
case such choice of California state law shall not be deemed to deprive Lender
of such rights and remedies as may be available under federal law.

        7.9 Arbitration. All disputes arising in connection with this Agreement
shall be finally settled by arbitration. The arbitration shall be held in San
Jose, California, and conducted in accordance with the Rules of the American
Arbitration Association. Judgment upon the award rendered may be entered in any
court having jurisdiction, or application may be made to such court for a
judicial acceptance of the award and an order or enforcement. Each party shall
bear its own expenses of the arbitration, but the arbitrator's fees and costs
shall be borne equally between the parties participating in the arbitration.

                            [Signature Page Follows]

                                       9

        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed as of the day and year first written above.

                                        HYSEQ, INC.

                                        /s/ Ted W. Love
                                        ----------------------------------------
                                        By: Dr. Ted W. Love
                                        Title: President and Chief Executive
                                               Officer

                                        DR. GEORGE B. RATHMANN

                                        /s/ George B. Rathmann
                                        ----------------------------------------
                                        Dr. George B. Rathmann

                   Signature Page to Line of Credit Agreement

                                    EXHIBIT A

                       FORM OF CONVERTIBLE PROMISSORY NOTE

               THE SECURITIES REPRESENTED BY THIS NOTE HAVE BEEN ACQUIRED FOR
               INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
               OF 1933. SUCH SECURITIES MAY NOT BE SOLD OR TRANSFERRED IN THE
               ABSENCE OF SUCH REGISTRATION UNLESS SUCH SALE OR TRANSFER IS
               EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS
               OF SAID ACT.

                           CONVERTIBLE PROMISSORY NOTE

    Sunnyvale, California
    August 6, 2001

        $20,000,000.00

        FOR VALUE RECEIVED, Hyseq, Inc., a Nevada corporation (the "Borrower"),
promises to pay to the order of Dr. George B. Rathmann, ("Lender"), the lesser
of (i) $20,000,000 and (ii) the outstanding principal amount of all Advances
made by Lender under that certain Line of Credit Agreement, dated as of August
6, 2001, by and between the Borrower and Lender (the "Agreement").

        The principal amount hereof is payable at the times and in the amounts
set forth in the Agreement. Borrower also promises to pay interest on the
Advances from the date of this Note until paid in full at the rates and at the
times determined in accordance with the Agreement. This Note is subject to
repayment and prepayments at the option of Borrower as, and to the extent,
provided in the Agreement.

        This Note is issued pursuant to and entitled to the benefits of the
Agreement to which reference is hereby made for a more complete statement of the
terms and conditions under which the Advances evidenced hereby were made and are
to be repaid. Capitalized terms used herein without definition shall have the
meanings set forth in the Agreement.

        Borrower shall pay all payments of principal and of interest on the
Advances to the order of Lender at such plan as Lender may from time to time
designate in writing, in lawful money of the United States of America.

               Notwithstanding the foregoing, and subject to the limitation set
forth in Section 1.8 of the Agreement, the total amount outstanding on this Note
may, at any time up to and including the Maturity Date and upon the mutual
agreement of Borrower and Lender (the "Conversion Notice"), be converted into
that number of shares of Borrower's Common Stock as shall equal the quotient
obtained by dividing the amount outstanding on this Note (i) by the average
closing price of the Borrower's Common Stock on the Nasdaq National Market as
reported in the Wall Street Journal for the twenty Trading Days (defined herein)
ending on the second Trading Day immediately prior to the day of such
conversion, or (ii) in connection with an offering Borrower's equity securities,
by the per share price of the Common Stock at which such equity securities shall

                                      A-1

be offered for sale by Borrower. "Trading Day" shall mean any day on which the
Nasdaq National Market is open and available for at least five hours for the
trading of securities.

               The Note Shares to be issued to Lender upon the conversion of
this Note will not be registered under the Securities Act, or qualified under
any state securities laws on the grounds that the offering and sale of the Note
Shares as contemplated by the Loan Documents are exempt from registration under
the Securities Act and any applicable state securities laws.

               The certificate(s) representing the Note Shares shall bear the
following legend:

               THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
               REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE
               BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN
               CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE
               OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
               STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM
               SATISFACTORY TO THE ISSUER THAT SUCH REGISTRATION IS NOT REQUIRED
               UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNLESS SOLD
               PURSUANT TO RULE 144 OF SUCH ACT.

        Upon the occurrence of an Event of Default, the unpaid balance of the
principal amount of this Note and all other obligations of Borrower under the
Agreement, together with all accrued but unpaid interest thereon, may
automatically become, or may be declared to be, due and payable in the manner,
upon the conditions and with the effect provided in the Agreement.

        This Note shall be governed by and construed and enforced in accordance
with the internal laws of the State of California, without regard to conflicts
of laws provisions. The terms of this Note are subject to amendment only in the
manner provided in the Agreement.

        The obligation of the Borrower to pay the principal of and interest on
the Advances at the place, and at the times, and in the currency prescribed in
this Note and in the Agreement is absolute and unconditional.

        Borrower promises to pay all costs and expenses, including all
attorneys' fees and expenses, all as provided in the Agreement, actually
incurred in the collection and enforcement of this Note, including any such
costs, expenses or fees actually incurred in any appeal in connection with the
collection and enforcement of this Note. Borrower and endorsers of this Note
hereby consent to renewals and extensions of time at or after the maturity
hereof, without notice, and hereby waive diligence, presentment, protest, demand
and notice of every kind and, to the full extent permitted by law, the right to
plead any statute of limitations as a defense to any demand hereunder.

                                      A-2

        IN WITNESS WHEREOF, Borrower has caused this Note to be executed and
delivered by its duly authorized officer, as of the day and year and at the
place first above written.

                                             BORROWER

                                             HYSEQ, INC.

                                             By:  /s/ Ted W. Love
                                                  ------------------------------
                                                  Name:
                                                  Title:

                  Signature Page to Convertible Promissory Note

                       TRANSACTIONS ON LINE OF CREDIT NOTE

                                                      Outstanding
                                      Amount of        Principal
                  Amount of Loan   Principal Paid       Balance       Notation
       Date       Made This Date      This Date        This Date       Made By
- ----------------- --------------   --------------     -----------    -----------

                     Schedule to Convertible Promissory Note

                                    EXHIBIT B

                             FORM OF DRAWING REQUEST

                               [HYSEQ LETTERHEAD]

                        _________________________, 200__

Dr. George B. Rathmann
5404 Lake Washington Blvd., N.E., Apt. I
Kirkland, Washington  98033

               Re:    Drawing Request

Dear Dr. Rathmann:

        Please take notice that pursuant to that certain Line of Credit
Agreement, (the "Agreement"), dated as of August 6, 2001, Hyseq, Inc., (the
"Borrower") desires to borrow on Advance of ____________________ Dollars
($________) from Dr. George B. Rathmann, (the "LENDER"), on
______________________, 200__. Capitalized terms not otherwise defined shall
have the meanings assigned to them in the Agreement.

        The Borrower hereby certifies that as of the date of this Drawing
Request, except as disclosed to Lender:

               (a) all of Borrower's representations and warranties contained in
the Agreement shall be true, correct and complete in all material respects to
the same extent as though made on and as of the date hereof;

               (b) no Event of Default shall have occurred and shall continue,
or shall result from, making the Advance;

               (c) no law or regulation shall prohibit, and no order, judgment
or decree of any court, arbitrator or governmental authority shall purport to
enjoin or restrain Lender from making the Advance; and

               (d) no change having a Material Adverse Effect on Borrower,
either individually or in the aggregate, shall have occurred since the date of
the Agreement.

                                            HYSEQ, INC.

                                            By:
                                                 -------------------------------
                                                 Name:
                                                 Title:

                                      B-1

                                                                   EXHIBIT 10.20

                              SETTLEMENT AGREEMENT

                                     between

                                   HYSEQ, INC.

                                       and

                                AFFYMETRIX, INC.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                              SETTLEMENT AGREEMENT

        This Settlement Agreement (this "AGREEMENT") is entered into this 24th
day of October, 2001 (the "Effective Date") by and between Hyseq, Inc., a Nevada
corporation ("HYSEQ") and Affymetrix, Inc., a Delaware corporation
("AFFYMETRIX") (each a "PARTY," collectively the "PARTIES").

W I T N E S S E T H:

        WHEREAS, Hyseq and Affymetrix have had various disputes which in part
have led to the commencement of certain litigation matters, including but not
limited to Hyseq, Inc., Plaintiff/Counterdefendant v. Affymetrix, Inc.,
Defendant/Counterclaimant, Case No. C 97-20188 RMW (ENE), United States District
Court, Northern District of California, San Jose Division; Affymetrix, Inc.,
Plaintiff v. Hyseq, Inc., Defendant, Case No C 99-21163 JF, United States
District Court, Northern District of California, San Jose Division; and Hyseq,
Inc., Plaintiff/Counterdefendant v. Affymetrix, Inc., Defendant/Counterclaimant,
Case No. C 00-20050 RMW, United States District Court, Northern District of
California, San Jose Division (collectively, the "MATTERS"); and

        WHEREAS, the Parties desire to reach an amicable resolution of the
Matters in an efficient and expeditious manner; and

        WHEREAS, contemporaneously with the execution and delivery of this
Agreement, Hyseq and Affymetrix have entered into the [***] and certain Related
Agreements (as such term is defined in the [***]) (collectively the "RELATED
AGREEMENTS");

        NOW THEREFORE, for and in consideration of the promises contained herein
and in the Related Agreements, and for other good and valuable consideration,
the sufficiency of which is hereby acknowledged, the Parties agree as follows:

1. Definitions. For purposes of this Agreement, the following terms have the
meanings hereinafter indicated:

        "AFFYMETRIX PATENTS" means the Affymetrix Patents-In-Suit, all patents
and/or patent applications claiming priority to or common priority with the
Patents-In-Suit; all foreign counterparts of such Patents-In-Suit, patents, and
/or patent applications; all continuations, continuations-in-part and
divisionals of such patents-in-suit, patents, and/or patent applications; and
all reissues and re-examinations of any of the foregoing; and all patents
issuing from such patent applications.

        "AFFYMETRIX PATENTS-IN-SUIT" means U.S. Patent Nos. 5,795,716, 5,744,305
and 5,800,992.

        "AFFILIATES" means any present or former company, partnership,
corporation or like entity, in any country, which, directly or indirectly (i)
wholly or substantially owns or controls an entity, directly or indirectly, or
(ii) is wholly or substantially owned or controlled by that entity, directly or
indirectly. As used herein, substantial ownership or control includes, but is
not limited to, ownership or control of more than fifty percent (50%) of the

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       1

voting stock or equity of an entity or effective management control by contract
or otherwise. Affiliates that may become affiliated in the future are explicitly
excluded from this definition.

        "CLAIMS" means any and all causes of action, demands, agreements,
contracts, covenants, representations, warranties, promises, undertakings,
actions, obligations, controversies, debts, costs, expenses, attorneys' fees,
expert witness fees, court costs, accounts, damages, losses, injuries and
liabilities, of whatever kind or nature, in law, equity, administrative
proceeding, or otherwise, present and future, whether known or unknown,
suspected or unsuspected, for or by reason of any matter, cause or thing
whatsoever from the beginning of time through and including the date hereof,
whether sounding in contract, tort or otherwise.

        "HYSEQ PATENTS" means the Hyseq Patents-In-Suit, all patents and/or
patent applications claiming priority to or common priority with the
Patents-In-Suit; all foreign counterparts of such Patents-In-Suit, patents, and
/or patent applications; all continuations, continuations-in-part and
divisionals of such patents-in-suit, patents, and/or patent applications; and
all reissues and re-examinations of any of the foregoing; and all patents
issuing from such patent applications.

        "HYSEQ PATENTS-IN-SUIT" means U.S. Patent Nos. 5,202,231, 5,525,464,
5,695,940, 6,018,041 and 5,972,619.

        "MATTERS" has the meaning specified in the Recitals, above.

        "PTO" means the United States Patent and Trademark Office.

2.      Representations, Warranties, and Indemnities.

        2.1 Each of Hyseq and Affymetrix represents and warrants to the other
that, as of the date hereof, it is a corporation, duly organized, validly
existing and in good standing under the laws of the jurisdiction of its
incorporation and has all requisite power and authority, corporate or otherwise,
to execute, deliver and perform this Agreement. This Agreement is a legal, valid
and binding obligation enforceable against each of Affymetrix and Hyseq in
accordance with its terms and conditions, except as such enforceability may be
limited by applicable bankruptcy, insolvency, moratorium, reorganization or
similar laws, from time to time in effect, affecting creditors rights generally.

        2.2 Hyseq represents and warrants to Affymetrix that it is the exclusive
owner of the Hyseq Patents and has the sole and exclusive right to assert each
of the Hyseq Patents without limitation, free and clear of any and all claims,
rights, liens or encumbrances of any nature whatsoever, including any claims of
any university or other educational institution or any governmental agency, and
has the full right and authority to license or assign such Patents.

        2.3 Affymetrix represents and warrants to Hyseq that it is the exclusive
owner of the Affymetrix Patents and has the sole and exclusive right to assert
each of the Affymetrix

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       2

Patents without limitation, free and clear of any and all claims, rights, liens
or encumbrances of any nature whatsoever, including any claims of any university
or other educational institution or any governmental agency, and has the full
right and authority to license or assign such Patents.

        2.4 Except for the representations and covenants expressly set forth in
this Agreement and the Related Agreements, no Party has made any statement or
representation to any other Party regarding a fact relied upon by the other
Party in entering into this Agreement or the Related Agreements and no Party has
relied upon any statement, representation, or promise of any other Party, or of
any representative or attorney for any other Party, in executing this Agreement
or in making the settlement provided for in this Agreement and the Related
Agreements.

        2.5 Each Party to this Agreement represents and warrants that it has not
assigned or transferred any portion of the Claims being released hereunder to
any other person, individual, firm, corporation or entity, and that no other
person, individual, firm, corporation or entity has any lien, right, claim or
interest in any such Claims. Furthermore, each Party represents and warrants
that this Agreement and the Related Agreements do not and shall not conflict
with or constitute a default under the terms, conditions or provisions of its
charter documents or any other agreement, understanding or commitment of such
Party nor is the authorization, consent or approval of any other person or
entity required for the execution and performance hereof. Without limiting the
generality of the foregoing, Hyseq represents and warrants that nothing
contained in this Settlement Agreement or the Related Agreements conflicts with
or constitutes a default under the terms, conditions, or provisions of [***].
Each Party to this Agreement shall indemnify, defend, and hold harmless any
other Party to [***] this Agreement from and against any and all of such Claims
arising out of, related to, or connected with any prior assignment or transfer,
or any purported assignment or transfer, of any of such Claims or the breach of
any other representation in this Section 2.

3.      Mutual Release of Claims.

        3.1 Release by Hyseq. Hyseq, on behalf of itself and its present and
former officers, directors, employees, agents, attorneys, assigns, predecessors,
subsidiaries, Affiliates, divisions and successors-in-interest (collectively,
the "HYSEQ RELEASING PARTIES"), does hereby forever and irrevocably release,
acquit, and discharge, and covenant not to sue or bring or maintain any Claim,
action or proceeding against, Affymetrix, its present and former officers,
directors, employees, predecessors, subsidiaries, Affiliates and divisions (the
"AFFYMETRIX RELEASED PARTIES") and/or any of them, from or regarding any and all
Claims that the Hyseq Releasing Parties have, had, or may have against any of
the Affymetrix Released Parties arising up to the Effective Date. This release
includes, without limitation, any Claims asserted in the Matters, any Claims
relating to the filing or prosecution of the Matters, and any other Claims
whatsoever, whether arising from negligent or intentional acts or omissions or
otherwise. Hyseq, for itself and the other Hyseq Releasing Parties, also hereby
forever and irrevocably releases, acquits, and discharges, and covenants not to
sue or bring or maintain any Claim, action or proceeding against, any [***] of
the Affymetrix Released Parties and/or any of them, from or regarding any and
all Claims

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       3

that the Hyseq Releasing Parties have, had, or may have against any of them
exclusively arising out of their making, using, importing, selling, or offering
to sell any Affymetrix [***] product up to the Effective Date.

        3.2 Release by Affymetrix. Affymetrix, on behalf of itself and its
present and former officers, directors, employees, agents, attorneys, assigns,
predecessors, subsidiaries, Affiliates, divisions and successors-in-interest
(collectively, the "AFFYMETRIX RELEASING PARTIES"), does hereby forever and
irrevocably release, acquit, and discharge, and covenant not to sue or bring or
maintain any Claim, action or proceeding against, Hyseq, its present and former
officers, directors, employees, predecessors, subsidiaries, Affiliates and
divisions (the "HYSEQ RELEASED PARTIES") and/or any of them, from or regarding
any and all Claims that the Affymetrix Releasing Parties have, had, or may have
against any of the Hyseq Released Parties arising up to the Effective Date. For
purposes of this release provision, [***]. This release includes, without
limitation, any Claims asserted in the Matters, any Claims relating to the
filing or prosecution of the Matters, and any other Claims whatsoever, whether
arising from negligent or intentional acts or omissions or otherwise.
Affymetrix, for itself and the other Affymetrix Releasing Parties, also hereby
forever and irrevocably releases, acquits, and discharges, and covenants not to
sue or bring or maintain any Claim, action or proceeding against, any [***] of
the Hyseq Released Parties and/or any of them, from or regarding any and all
Claims that the Affymetrix Releasing Parties have, had, or may have against any
of them exclusively arising out of their making, using, importing, selling, or
offering to sell any Hyseq [***] product up to the Effective Date.

        3.3 Section 1542 Waiver. Affymetrix and Hyseq have each been fully
advised by its respective attorneys of the contents and meaning of Section 1542
of the Civil Code of the State of California, which reads as follows:

               "SECTION 1542. (GENERAL RELEASE- CLAIMS EXTINGUISHED.) A GENERAL
               RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT
               KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING
               THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED
               HIS SETTLEMENT WITH THE DEBTOR."

        Affymetrix and Hyseq each expressly waive and relinquish all rights and
benefits under Section 1542, and any similar law or common law principle of
similar effect of any state or territory of the United States and any foreign
jurisdiction, with respect to the Claims released hereby, and expressly consent
that this Agreement will be given full force and effect according to each and
all of its express terms and provisions, including with respect to the release
of any claims that are unknown or unsuspected that Affymetrix or Hyseq may have
against each other.

        3.4 Finality of Waiver. The Parties hereby expressly and knowingly
acknowledge that each may, after execution of this Agreement, discover facts
different from or in addition to those which each knows or believes to be true
with respect to the claims released in this Agreement. Nonetheless, each Party
agrees that this Agreement shall be and remain in full force and effect in all
respects, notwithstanding such different or additional

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       4

facts. It is the intention hereby fully, finally, and forever to settle all such
matters, and release any and all Claims relating to those matters, which do now
exist or previously have existed by and among the Parties. In furtherance of
such intention, the releases given in this Agreement shall be and remain in
effect as full and completed releases of such Matters, notwithstanding the
discovery by any of the Parties of the existence of any additional or different
Claims or facts relating to the Claims. Similarly, in entering into this
Agreement, each Party assumes the risk of mistake, and if any Party should
subsequently discover that any fact it relied upon in entering into this
Agreement was untrue, or that its understanding of the facts or law was
incorrect, such Party shall not be entitled to set aside this Agreement or be
entitled to recover any damages on that account unless the mistake was due to an
intentional misrepresentation by the other Party. This Agreement, and the
Releases it contains, is intended, pursuant to the advice of independently
selected legal counsel, to be final and binding between and among the Parties to
this Agreement regardless of any claims of mistake of fact or law or of any
other circumstances whatsoever.

        3.5 The Releases provided for in this Section 3 shall survive the
termination of this Agreement and the termination of any or all of the Related
Agreements. No dispute or claimed breach of any of such Agreements nor failure
of consideration nor the inadequacy of the remedies therefor shall in any way
affect the full enforceability of such releases which the parties acknowledge
and agree are final, binding and not subject to termination or modification
after the Effective Date.

4.      Dismissal with Prejudice/Withdrawal.

        4.1 Each of Affymetrix and Hyseq acknowledges and agrees that the
Patents-In-Suit asserted by the other Party are valid and enforceable, except as
otherwise determined by the Court or the PTO.

        4.2 The Parties agree that they jointly will within two days of the
Effective Date sign and file with the United States District Court for the
Northern District of California, (i) a Stipulation and Proposed Order of
Dismissal and Final Judgment substantially in the form attached hereto as
Exhibit A in Cases No. 97-20188 and 00-20050 and (ii) a Stipulation and Proposed
Order of Dismissal and Final Judgment substantially in the form attached hereto
as Exhibit B in Case No. 99-21163.

        4.3 Affymetrix and Hyseq mutually agree to settle the interference
proceedings titled Chee v. Drmanac, Interference No. 104,552 in the form
attached hereto as Exhibit C.

        4.4 In the event that the Court declines to enter the Final Judgments in
substantially the forms set forth in Exhibits A and B, each Party shall have the
right for a period of seven (7) days to terminate this Agreement and the Related
Agreements.

        4.5 The Parties represent and warrant that there are no adverse
proceedings between them that are filed, pending or planned other than the
Matters and Interference No. 104,552. It is the intention of the Parties to
settle all outstanding disputes between them. If any pending adverse proceeding
was omitted from the Matters, the parties intend to settle

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       5

any such litigation, proceeding or action and therefore agree to take all
necessary steps to withdraw from, discontinue, terminate or dismiss such omitted
adverse proceeding.

        4.6 (a) Hyseq has reviewed and analyzed the Affymetrix Patents-In Suit,
and agrees that it will not in the future, directly or indirectly, oppose,
contest, or dispute the priority, validity or enforceability of any Affymetrix
Patents in any United States or foreign court, agency, or other tribunal, now or
in the future, and that it will not seek reexamination or modification of any
Affymetrix Patents. Hyseq agrees not to actively seek [***] interferences with
[***]. Hyseq further agrees that it [***].

               (a) Affymetrix has reviewed and analyzed the Hyseq
Patents-In-Suit, and agrees that it will not in the future, directly or
indirectly, oppose, contest, or dispute the priority, validity or enforceability
of any Hyseq Patents in any United States or foreign court, agency, or other
tribunal, now or in the future, and that it will not seek reexamination or
modification of any Hyseq Patents. Affymetrix agrees not to actively seek [***]
interferences with [***]. Affymetrix further agrees that it [***].

5.      Miscellaneous.

        5.1 The Parties agree to keep the terms of this Agreement confidential,
and agree not to disclose the terms of this Agreement, except pursuant to a
mutually-agreed press release, and except as may be (i) necessary for the
purpose of enforcing any provision of this Agreement, or (ii) lawfully required
by any governmental agency. Notwithstanding the foregoing, both Parties may
agree to inform any court with jurisdiction over a Matter of the existence of a
settlement and the Parties may file this Agreement and any other related
agreements in the PTO as required under 35 U.S.C. Section 135(c). If this
Agreement or any of the Related Agreements is sought in discovery, the Party
responding to discovery shall promptly notify all Parties and shall do
everything possible to maintain the confidentiality of the Agreement.

        5.2 Each Party represents and acknowledges that it has read this
Agreement and fully understands and agrees to its terms, and that each Party has
been represented by counsel in connection with the negotiation and execution of
this Agreement.

        5.3 This Agreement may be executed in counterparts, each of which shall
be deemed an original, but all of which together shall constitute one and the
same instrument.

        5.4 The Parties agree that this Agreement will be governed by and
construed in accordance with the internal laws of the State of California
applicable to agreements made and to be performed entirely within such State,
without regard to the conflicts of laws principles of such State.

        5.5 This Agreement and the Related Agreements contain the entire set of
agreements among the Parties with respect to the matters contained herein, and
may be amended only by written agreement signed by the Parties to the Agreement.
The provisions of all of such agreements shall be construed together so as to
give effect to the provisions of each of the agreements to the greatest extent
possible, except that under no circumstances

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       6

will the releases granted to the Parties in Section 3 above be terminated or
modified in any manner whatsoever.

        5.6 This Agreement is intended only for the benefit of the Parties
hereto, the Hyseq Released Parties and the Affymetrix Released Parties, and the
beneficiaries expressly referenced in this Agreement. No other person or entity
is entitled to any rights or benefits hereunder.

        5.7 Each Party shall perform any further acts, and sign and deliver any
further instruments and documents, as may be required to accomplish the purposes
of this Agreement; provided, however, that nothing in this provision shall be
interpreted to modify any of the specific terms of this Agreement.

        5.8 Any notice, requests, delivery, approval or consent required or
permitted to be given under this Agreement shall be in writing and shall be
deemed to have been sufficiently given if delivered in person, transmitted by
commercial overnight courier, or transmitted by telex telegram or telecopy
(facsimile, with confirmed receipt) to the Party to whom it is directed at its
address shown below or such other address as such Party shall have last given by
notice to the other Party (referred to herein as "NOTICE"). All notices shall be
effective upon receipt.

               If to Hyseq, addressed to:

               Hyseq, Inc.
               675 Almanor Ave.
               Sunnyvale, CA 94085
               Attn: General Counsel
               Fax: (408) 524-8145

               If to Affymetrix, addressed to:

               Affymetrix, Inc.
               3380 Central Expressway
               Santa Clara, California 95051
               Attn: General Counsel
               Fax: (408) 481-4709

        5.9 Neither Party shall assign any of its rights or obligations
hereunder without the prior, written consent of the other Party, which other
Party may [***], except that no such consent shall be required with respect to a
merger, consolidation, reorganization, sale of stock or sale or transfer of
substantially all of the business and assets of a Party related to the Matters,
provided that [***]. This Agreement shall be binding upon the permitted
successors and permitted assigns of the Parties. Any assignment not in
accordance with the above shall be void.

        5.10 The prevailing Party in any action to enforce this Agreement will
be entitled to recover its attorneys fees and costs in connection with such
action.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       7

        5.11 In the event that one or more of the provisions of this Agreement
is held to be invalid, illegal or unenforceable in any respect, such provision
will nevertheless remain valid, legal and enforceable in all other respects and
to such extent as may be permissible. In addition, any such invalidity,
illegality or unenforceability will not affect any other provision hereof, and
this Agreement will be construed as if such invalid, illegal or unenforceable
provision had never been contained herein.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       8

        IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
executed in counterparts as of the date first written above.

                                        AFFYMETRIX, INC.

                                        By: /s/ Barbara A. Caulfield
                                            ------------------------------------
                                            Name:  Barbara A. Caulfield
                                                   -----------------------------
                                            Title: Executive Vice President and
                                                   General Counsel
                                                   -----------------------------

                                        HYSEQ, INC.

                                        By: /s/ Ted Love
                                            ------------------------------------
                                            Name: Ted Love
                                                   -----------------------------
                                            Title: President and Chief Executive
                                                   Officer
                                                   -----------------------------

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       9

                                   Exhibit A

MARSHALL, O'TOOLE, GERSTEIN, MURRAY & BORUN
Kevin M. Flowers, Ph.D. (Ill. Bar No. 06242895)
William K. Merkel, Ph.D. (Ill. Bar No. 06225636)
6300 Sears Tower
233 South Wacker Drive
Chicago, Illinois 60606-6402

Attorneys for Plaintiff/Counterdefendant Hyseq, Inc.

IRELL & MANELLA LLP
Morgan Chu (SBN 70446)
Richard de Bodo (SBN 128199)
Jeffrey L. Arrington  (SBN 139435)
1800 Avenue of the Stars
Los Angeles, California 90067-4276

Attorneys for Defendant/Counterclaimant Affymetrix, Inc.

                          UNITED STATES DISTRICT COURT
                         NORTHERN DISTRICT OF CALIFORNIA
                                SAN JOSE DIVISION

HYSEQ, INC.,                                   Case No. C 97-20188 RMW (ENE)

               Plaintiff/Counterdefendant,     Case No. C 00-20050 RMW

        v.                                     STIPULATION AND PROPOSED ORDER OF

AFFYMETRIX, INC.,                              DISMISSAL AND FINAL  JUDGMENT

               Defendant/Counterclaimant.

                                               Honorable Ronald M. Whyte

                                           STIPULATION OF DISMISSAL AND JUDGMENT
                               CASE NOS. C 97-20188 RMW (ENE) AND C 00 20050 RMW

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

               Plaintiff and Counterdefendant Hyseq, Inc. ("Hyseq") and
Defendant and Counterclaimant Affymetrix, Inc. ("Affymetrix") have entered into
a confidential settlement which provides a basis for settlement and judgment of
the claims and counterclaims in these actions. Pursuant to this settlement,
Hyseq and Affymetrix, by and through their respective counsel, hereby stipulate
to the dismissal with prejudice and conclusion of all claims and counterclaims
in these actions.

               The Court having duly deliberated thereon,

               IT IS HEREBY ORDERED, ADJUDGED AND DECREED that final judgment is
hereby entered as follows:

               1. The parties admit that all claims of the asserted patents are
valid and enforceable.

               2. This Court shall retain jurisdiction over the implementation
of or disputes arising out of the parties' settlement, including the
jurisdiction to order any appropriate remedy under law or equity. The settlement
also encompasses another case involving the parties, Affymetrix, Inc. v. Hyseq,
Inc., Case No. C 99-21163 JF.

               3. Case Nos. C 97-20188 RMW and C 00-20050 are dismissed with
prejudice.

               4. Each party shall bear its own attorneys' fees and costs of
suit.

Dated:                             MARSHALL, O'TOOLE, GERSTEIN, MURRAY & BORUN
      --------------------

                                   By:
                                      ------------------------------------------
                                      Kevin M. Flowers Ph.D.
                                      Attorneys for Plaintiff/Counterdefendant
                                      Hyseq, Inc.

Dated:                             IRELL & MANELLA LLP
      --------------------

                                   By:
                                      ------------------------------------------
                                      Richard de Bodo
                                      Attorneys for Defendant/Counterclaimant
                                      Affymetrix, Inc.

IT IS SO ORDERED.

DATED:
      --------------------

                                   ---------------------------------------------
                                      Honorable Ronald M. Whyte
                                      United States District Judge

                                           STIPULATION OF DISMISSAL AND JUDGMENT
                               CASE NOS. C 97-20188 RMW (ENE) AND C 00 20050 RMW

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                   Exhibit B

IRELL & MANELLA LLP
Morgan Chu (SBN 70446)
Richard de Bodo (SBN 128199)
Jeffrey L. Arrington  (SBN 139435)
1800 Avenue of the Stars
Los Angeles, California  90067-4276

Attorneys for Plaintiff Affymetrix, Inc.

MARSHALL, O'TOOLE, GERSTEIN, MURRAY & BORUN
Kevin M. Flowers, Ph.D. (Ill. Bar No. 06242895)
William K. Merkel, Ph.D. (Ill. Bar No. 06225636)
6300 Sears Tower
233 South Wacker Drive
Chicago, Illinois 60606-6402

Attorneys for Defendant Hyseq, Inc.

                          UNITED STATES DISTRICT COURT
                         NORTHERN DISTRICT OF CALIFORNIA
                                SAN JOSE DIVISION

AFFYMETRIX, INC.,                              Case No. C 99-21163 JF

               Plaintiff,                      STIPULATION AND PROPOSED ORDER OF

        v.                                     DISMISSAL AND FINAL  JUDGMENT

HYSEQ, INC.,

               Defendant.                      Honorable Jeremy Fogel

                                           STIPULATION OF DISMISSAL AND JUDGMENT
                                                          CASE NO. C 99-21163 JF

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

               Plaintiff Affymetrix, Inc. ("Affymetrix") and Defendant Hyseq,
Inc. ("Hyseq") have entered into a confidential settlement which provides a
basis for settlement and judgment of the claims in this action. Pursuant to the
settlement, Affymetrix and Hyseq, by and through their respective counsel,
hereby stipulate to the dismissal with prejudice and conclusion of all claims in
this action, with each party to bear its own attorneys' fees and costs of suit.

               The Court having duly deliberated thereon,

               IT IS HEREBY ORDERED, ADJUDGED AND DECREED that final judgment is
hereby entered as follows:

               1. The parties admit that all claims of the asserted patents are
valid and enforceable.

               2. The Court, Honorable Ronald M. Whyte, shall retain
jurisdiction over the implementation of or disputes arising out of the parties'
settlement, including the jurisdiction to order any appropriate remedy under law
or equity. The settlement also encompasses two other cases involving the
parties, Hyseq, Inc. v. Affymetrix, Inc., Case No. C 97-20188 RMW (ENE) and
Hyseq, Inc. v. Affymetrix, Inc., Case No. C 00-20050 RMW.

               3. Case No. C 99-20163 is dismissed with prejudice.

               4. Each party shall bear its own attorneys' fees and costs of
suit.

Dated:                             IRELL & MANELLA LLP
      --------------------

                                   By:
                                      ------------------------------------------
                                        Richard de Bodo
                                        Attorneys for Plaintiff Affymetrix, Inc.

Dated:                             MARSHALL, O'TOOLE,GERSTEIN, MURRAY & BORUN
      --------------------

                                   By:
                                      ------------------------------------------
                                        Kevin M. Flowers Ph.D.
                                        Attorneys for Defendant Hyseq, Inc.

IT IS SO ORDERED.

Dated:
      --------------------

                                   ---------------------------------------------
                                        Honorable Jeremy Fogel
                                        United States District Judge

                                           STIPULATION OF DISMISSAL AND JUDGMENT
                                                          CASE NO. C 99-21163 JF

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                    Exhibit C

                        INTERFERENCE SETTLEMENT AGREEMENT
                   (BETWEEN HYSEQ, INC. AND AFFYMETRIX, INC.)

        This Settlement of Interference Agreement is made as of this 24th day of
October, 2001 (the "Effective Date") by and among Hyseq, Inc., a Nevada
corporation (herein "Hyseq"), having a place of business in Sunnyvale, CA, and
Affymetrix, Inc., a Delaware corporation (herein "Affymetrix"), having a place
of business in Santa Clara, California.

        WHEREAS, the United States Patent and Trademark Office ("PTO") has
        declared Interference No. 104,552 between US Patent Nos. 5,795,716 and
        5,974,164 of Affymetrix, and Application No. 09/358,875 of Hyseq, in
        order to determine priority between the parties with respect to
        inventions; and

        WHEREAS, Hyseq and Affymetrix have been involved in litigation,
        opposition, interference, attempted interference and other adverse
        proceedings involving their respective patents and patent applications
        in various countries; referred to herein as "Litigation Proceedings";
        and

        WHEREAS, Hyseq and Affymetrix have resolved and settled the Litigation
        Proceedings on an amicable basis and have entered into a Settlement
        Agreement, which agreement includes a provision that the parties will
        enter into a Interference Settlement Agreement to resolve Interference
        No. 104,552.

        Hyseq and Affymetrix do hereby agree as follows:

        1.     PRELIMINARY MOTIONS

               1.1    The parties agree that no preliminary motions or
                      preliminary statements will be filed in this interference.

        2.     TERMINATION OF INTERFERENCE

               2.1    On or before November 15, 2001 Hyseq, through its
                      attorneys, shall file an abandonment of contest in
                      Interference No. 104,552.

        3.     FUTURE INTERFERENCES

               3.1    Affymetrix agrees not to actively seek [***] interferences
                      with [***].

               3.2    Hyseq agrees not to actively seek [***] interferences with
                      [***].

               3.3    The parties are [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

        4.     FILING OF AGREEMENT

               4.1    Promptly after this agreement is executed by both parties
                      Affymetrix will file a copy of this Interference
                      Settlement Agreement and all collateral agreements with
                      the PTO as required by 35 U.S.C. Section 135(c) and 37
                      C.F.R. Section 1.666(b), requesting that the copies of
                      this Interference Settlement Agreement and any collateral
                      agreement filed therewith be held separate from the file
                      of the interference, and made available only to Government
                      agencies upon written request, or to any person upon
                      petition and showing of good cause. In the event that such
                      a written request is made or such a petition is filed, it
                      is respectfully requested that the persons identified
                      below be notified before such request or petition is
                      granted:

               Edward J. Keeling, Esq.                Michael R. Weiner
               Townsend and Townsend and Crew LLP     Marshall, Gerstein & Borun
               Two Embarcadero Center, 8th Floor      6300 Sears Tower
               8th Floor                              233 South Wacker Drive
               San Francisco, CA 94111-3834           Chicago, IL 60606-6402
               Phone: (415) 576-0200                  Phone: (312) 474-6300
               Fax: (415) 576-0300                    Fax: (312) 474-0448

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       2

               IN WITNESS WHEREOF, the parties have caused this Interference
Settlement Agreement to be executed by their authorized officials.

               AGREED TO:

Hyseq, Inc.

By:
   -------------------------------------

- ----------------------------------------
Printed Name

- ----------------------------------------
Title

- ----------------------------------------
Date

Affymetrix, Inc.

By:
   -------------------------------------

- ----------------------------------------
Printed Name

- ----------------------------------------
Title

- ----------------------------------------
Date

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                        3

                                                                   EXHIBIT 10.21

                       INTERFERENCE SETTLEMENT AGREEMENT
                   (BETWEEN HYSEQ, INC. AND AFFYMETRIX, INC.)

        This Settlement of Interference Agreement is made as of this 24th day of
October, 2001 (the "Effective Date") by and among Hyseq, Inc., a Nevada
corporation (herein "Hyseq"), having a place of business in Sunnyvale, CA, and
Affymetrix, Inc., a Delaware corporation (herein "Affymetrix"), having a place
of business in Santa Clara, California.

        WHEREAS, the United States Patent and Trademark Office ("PTO") has
        declared Interference No. 104,552 between US Patent Nos. 5,795,716 and
        5,974,164 of Affymetrix, and Application No. 09/358,875 of Hyseq, in
        order to determine priority between the parties with respect to
        inventions; and

        WHEREAS, Hyseq and Affymetrix have been involved in litigation,
        opposition, interference, attempted interference and other adverse
        proceedings involving their respective patents and patent applications
        in various countries; referred to herein as "Litigation Proceedings";
        and

        WHEREAS, Hyseq and Affymetrix have resolved and settled the Litigation
        Proceedings on an amicable basis and have entered into a Settlement
        Agreement, which agreement includes a provision that the parties will
        enter into a Interference Settlement Agreement to resolve Interference
        No. 104,552.

        Hyseq and Affymetrix do hereby agree as follows:

        1.     PRELIMINARY MOTIONS

               1.1    The parties agree that no preliminary motions or
                      preliminary statements will be filed in this interference.

        2.     TERMINATION OF INTERFERENCE

               2.1    On or before November 15, 2001 Hyseq, through its
                      attorneys, shall file an abandonment of contest in
                      Interference No. 104,552.

        3.     FUTURE INTERFERENCES

               3.1    Affymetrix agrees not to actively seek [***] interferences
                      with [***].

               3.2    Hyseq agrees not to actively seek [***] interferences with
                      [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

               3.3    The parties are [***].

        4.     FILING OF AGREEMENT

               4.1    Promptly after this agreement is executed by both parties
                      Affymetrix will file a copy of this Interference
                      Settlement Agreement and all collateral agreements with
                      the PTO as required by 35 U.S.C. Section 135(c) and 37
                      C.F.R. Section 1.666(b), requesting that the copies of
                      this Interference Settlement Agreement and any collateral
                      agreement filed therewith be held separate from the file
                      of the interference, and made available only to Government
                      agencies upon written request, or to any person upon
                      petition and showing of good cause. In the event that such
                      a written request is made or such a petition is filed, it
                      is respectfully requested that the persons identified
                      below be notified before such request or petition is
                      granted:

               Edward J. Keeling, Esq.                Michael R. Weiner
               Townsend and Townsend and Crew LLP     Marshall, Gerstein & Borun
               Two Embarcadero Center, 8th Floor      6300 Sears Tower
               8th Floor                              233 South Wacker Drive
               San Francisco, CA 94111-3834           Chicago, IL 60606-6402
               Phone: (415) 576-0200                  Phone: (312) 474-6300
               Fax: (415) 576-0300                    Fax: (312) 474-0448

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       2

        IN WITNESS WHEREOF, the parties have caused this Interference Settlement
Agreement to be executed by their authorized officials.

               AGREED TO:

Hyseq, Inc.

By: /s/ Ted Love
    ------------------------------------

 Ted Love
- ----------------------------------------
Printed Name

 President and Chief Executive Officer
- ----------------------------------------
Title

 October 24, 2001
- ----------------------------------------
Date

Affymetrix, Inc.

By: /s/ Barbara A. Caulfield
   -------------------------------------

 Barbara A. Caulfield
- ----------------------------------------
Printed Name

 Executive Vice President and General
 Counsel
- ----------------------------------------
Title

 October 24, 2001
- ----------------------------------------
Date

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       3

                                                                   EXHIBIT 10.22

                    Product Development and Supply Agreement

                                   N-Mer, Inc.
                                       and
                                Affymetrix, Inc.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                    AGREEMENT

        This agreement ("Agreement"), dated as of October 24, 2001, between
Affymetrix, Inc. ("Affymetrix") a Delaware corporation having its principal
place of business at 3380 Central Expressway, Santa Clara, California 95051, and
N-Mer, Inc. ("N-Mer") a Delaware corporation having its principal place of
business at 670 Almanor Avenue, Sunnyvale, CA 94086.

RECITALS

        WHEREAS, Affymetrix has research, development, and manufacturing
capabilities and facilities, and has developed certain rights relevant to DNA
probe array based technology.

        WHEREAS, N-Mer has certain intellectual property rights, research and
development capabilities, and facilities to conduct research and development
activities for the N-Mer Field.

        WHEREAS, Affymetrix and N-Mer desire to enter into an agreement whereby
Affymetrix will supply N-Mer with DNA probe arrays for use in the N-Mer Field.

         NOW, THEREFORE, in consideration of the mutual covenants and promises
contained in this Agreement, Affymetrix and N-Mer agree as follows:

1       DEFINITIONS

        1.1 "Affiliate" shall mean any corporation, company, partnership, joint
venture and/or firm which is controlled by or controls a Party or is under
common control with a Party, but only for so long as such Affiliate remains an
Affiliate of a Party, and only if such Affiliate is bound by the terms of this
Agreement. For clarity, an Affiliate shall retain rights pursuant to this
Agreement only for so long as such Affiliate remains an Affiliate of the
designated entity and only if such Affiliate is bound by the terms of this
Agreement. For purposes of this Section, "control" shall mean, in the case of
corporations (or equivalents of corporations), direct or indirect ownership of
at least [***] percent ([***]%) of the stock having the right to vote for
directors of such corporation or, in the case of partnerships, at least [***]
percent ([***]%) of the ownership interest in such partnership. In any case,
"control" shall require the right to direct day-to-day management and direction
of the entity. Notwithstanding the foregoing, if local law requires a minimum
percentage of local ownership, control will be established by direct or indirect
beneficial ownership of [***] percent ([***]%) of the maximum ownership
percentage that may, under such local law, be owned by foreign interests. [***].

        1.2 "Affymetrix Field" means Probe Array-based products for use in all
applications excluding uses wherein [***] provided that within such Probe Array
or set of Probe Arrays used to assay [***] and intended to be used together, the
collection of probes shall satisfy [***] the following criteria:

                      (1) All Non-Control Probes are designed based on a
               specific reference sequence [***];

                      (2) Control probes on any array represent less than [***]%
               of all

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       1

               probes on that array and all other probes are Non-Control Probes;
               and

                      (3) Collectively the sequence of the Informative Probe
               Portions of the probes of any [***].

For example, without limiting the foregoing, the Parties agree that "Affymetrix
Field" includes [***].

It is the intent of the Parties that the "Affymetrix Field" and "N-Mer Field"
are mutually exclusive.

        1.3 "Affymetrix Work Plan Technology" shall mean the patents, patent
applications, trade secrets and other Information owned or controlled by
Affymetrix that is [***] to perform the Parties' obligations under the Work
Plan.

        1.4 "Affymetrix License Agreement" shall mean the License Agreement,
dated as of the date hereof, between Affymetrix and Callida Genomics, Inc.

        1.5 "Bacterial Clinical Diagnostics" shall mean the use of Probe Arrays
in the determination of [***] where the results of the assay are reported to a
caregiver or his/her patient for use in a therapeutic decision for that patient.

        1.6 "Confidential Information" means any and all non-public and
proprietary Information that is specifically designated as such and that is
disclosed by either Party to the other in any form in connection with this
Agreement and that, if orally disclosed, shall be reduced in writing and
delivered to the receiving Party within thirty (30) days of such disclosure.

        1.7 "Control Probe" means a probe within the Probe Array [***].

        1.8 "Custom Probe Arrays" shall refer to Probe Arrays the manufacture of
which requires the creation of one or more custom mask designs for particular
probe sequences identified by N-Mer pursuant to Sections 3.1 or 3.2,
specifically for and only for use in the N-Mer Field.

        1.9 "Effective Date" shall mean the Closing Date (as such term is
defined in the Preferred Stock Purchase Agreement, dated as of the date hereof,
among Affymetrix, N-Mer, Callida Genomics, Inc. and Hyseq, Inc.).

        1.10 "Information" means any data, results, inventories, information,
know-how, processes, machines, trade secrets, techniques, methods, development,
material, or compositions of matter or other information of any type or kind.

        1.11 "Informative Probe Portion" of a probe means that portion of a
probe sequence that is [***]; the Informative Probe Portion being characterized
by an Informative Probe Length that is [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       2

        1.12 "N-Mer Field" means Probe Array-based products for use in all
applications, excluding the following: (a) uses wherein [***] probes in the
array is [***], and (b) Bacterial Clinical Diagnostics; provided that within
such Probe Array or set of Probe Arrays used to assay a target nucleic acid, the
collection of probes shall satisfy all of the following criteria:

                      (1) Each Non-Control Probe is designed without use of a
               reference sequence [***]; and

                      (2) Control probes represent less than [***]% of all
               probes on any single array and all other probes are Non-Control
               Probes.

It is the intent of the Parties that the "Affymetrix Field" and "N-Mer Field"
are mutually exclusive.

        1.13 "N-Mer's Area Of Interest" shall mean the use of Probe Arrays and
related reagents, protocols, instrumentation and software supplied hereunder,
solely for use in and licensed for use only in the N-MER Field: a) as a research
tool for internal research and development of applications of, or assays
associated with, Probe Arrays supplied by Affymetrix hereunder, b) pursuant to
the Product Solicitation Agreement, for the distribution or sale of Probe Arrays
supplied pursuant to this Agreement to end users for internal research purposes
or to generate databases for commercial license in accordance with Section 3.6,
or c) in the event that the Product Solicitation Agreement terminates, for the
distribution or sale of Probe Arrays supplied pursuant to this Agreement to end
users for internal research purposes or to generate databases for commercial
license in accordance with Section 3.6.

        1.14 "Non-Control Probe" means a probe within the Probe Array that
provides information about the sequence of the target nucleic acid in the
sample.

        1.15 "Lot" shall refer to a specified minimum purchase quantity of Probe
Arrays for the particular wafer format of Probe Array specified by N-Mer, and
which will be identified by Affymetrix within [***] of submission of a design of
a Custom Probe Array by N-Mer; provided, however, that a Lot shall not be more
than (i) [***] Probe Arrays in a [***] Probe Array/wafer format for research and
development and (ii) [***] Probe Arrays in a [***] Probe Array/wafer format or
an equivalent proportional number of Probe Arrays in a different Probe
Array/wafer format for commercial purposes. The Project Coordination Committee
shall have a right at the commencement of a design for a Custom Probe Array,
[***], to request Affymetrix to vary the size of a Lot upwards or downwards.
Affymetrix will use [***] efforts to accommodate such request provided such
variance does not [***].

        1.16 "New Process Custom Probe Array" shall mean all Custom Probe Arrays
that are not Standard Custom Probe Arrays.

        1.17 "Party" shall mean Affymetrix or N-Mer. "Parties" shall mean
Affymetrix and N-Mer.

        1.18 "Probe Array" means a single Solid Support having affixed thereto
oligonucleotide, including nucleic acid, probes [***]; provided that [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       3

        1.19 "Product Solicitation Agreement" shall mean the agreement of that
name between Affymetrix and N-Mer of even date herewith.

        1.20 "Project Coordination Committee" or "PCC" shall have the meaning
assigned to it in Section 6.1.

        1.21 "Solid Support" means a nonporous planar surface of a solid
material; [***].

        1.22 "Standard Custom Probe Array" shall mean a Custom Probe Array where
the probe sequence at any given position is [***] and where such Custom Probe
Array is fabricated using the same equipment and process as Affymetrix then
standard probe arrays sold to [***] or more Third Parties.

        1.23 "System(s)" shall mean fluidics station(s), work station(s), probe
array reader(s), and associated software, such software licensed to N-Mer, and
such fluidics station(s) and probe array reader(s) sold to N-Mer, only for use
with Probe Arrays sold hereunder.

        1.24 "Term" shall mean the period beginning on the Effective Date and
ending upon dissolution of N-Mer. For purposes of this agreement, if Affymetrix
exercises the Option (as such term is defined in the Option Agreement, dated as
of the date hereof, among Affymetrix, N-Mer and Callida Genomics, Inc.) such
exercise shall be deemed to be a dissolution of N-Mer.

        1.25 "Third Party" shall mean any person or entity other than
Affymetrix, N-Mer, or Affiliates of either.

        1.26 "Work Plan" shall mean the plan set forth in Exhibit A, and as may
be amended from time to time in writing by agreement of the Project Coordination
Committee.

2       PRODUCT DEVELOPMENT PLAN

        2.1 Performance of Work Plan. Affymetrix and N-Mer shall collaborate
together to develop technology and products as set forth in the Work Plan. N-Mer
shall bear all costs and expenses for the Parties' work required by the Work
Plan. The Parties shall use [***] efforts to perform their respective
obligations in compliance with the Work Plan, including, without limitation, the
schedules set forth therein. Affymetrix shall supply such services at [***]. The
Parties shall exchange Confidential Information as reasonably required to
perform the Work Plan, provided that a Party may disclose Confidential
Information of the other Party (i) solely to employees who need to know such
Confidential Information in order to perform their obligations under the Work
Plan and (ii) to consultants and/or advisors provided that such consultants and
advisors have signed confidentiality agreements at least as strict as the
confidentiality provisions in this Agreement and provided further that such
disclosure shall occur only with the prior written consent of the Party whose
Confidential Information is proposed to be disclosed, which consent shall not be
unreasonably denied, conditioned or delayed. Changes to the Work Plan shall be
subject to the mutual agreement of the Project Coordination Committee, [***].

        2.2 License to Perform Work Plan. Affymetrix hereby grants N-Mer a
royalty-free, fully paid-up, worldwide, non-exclusive license, without the right
to grant sublicenses, under the

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       4

Affymetrix Work Plan Technology, solely to perform N-Mer's obligations under the
Work Plan. For purposes of clarity, no right of distribution or sale is provided
under this Section 2.2.

        2.3 License Under Affymetrix Work Plan Technology. Affymetrix hereby
grants to N-Mer a royalty-free, fully paid-up, worldwide, non-exclusive license,
without the right to grant sublicenses, under the Affymetrix Work Plan
Technology, solely as required in connection with the use (for development of
products to be sold under the Product Solicitation Agreement), manufacture, and
importation of [***] to be used solely in conjunction with Custom Probe Arrays
made by Affymetrix pursuant to this Agreement. Affymetrix hereby grants to N-Mer
a non-exclusive license (without the right to sublicense), under the Licensed
Patents (as such term is defined in the Affymetrix License Agreement), solely in
the N-Mer Field, and under the Patents-in-Interference (as such term is defined
in the Affymetrix License Agreement), in all fields, excluding Bacterial
Clinical Diagnostics, in each case on the same terms and subject to the same
conditions as the licenses to such Licensed Patents and Patents-in-Interference
granted by Affymetrix under the Affymetrix License Agreement, except that this
license shall be used solely in conjunction with Custom Probe Arrays made by
Affymetrix pursuant to this Agreement.

        2.4 Supply of Material and Services. Affymetrix shall supply N-Mer with
Custom Probe Arrays, chip design services, Systems and other reagents and
services as provided in the Work Plan that are necessary for N-Mer to perform
its obligations under the Work Plan. Such supply shall be pursuant to the terms
set forth in Section 3 below.

3       PROBE ARRAY SUPPLY

        3.1 Standard Custom Probe Array Design. During the Term, N-Mer may
provide to Affymetrix probe sequences for Standard Custom Probe Arrays. Upon
Affymetrix' receipt of such probe sequences and such [***] related information,
Affymetrix shall use [***] efforts to design, lay out, and procure masks for
such Standard Custom Probe Arrays according to the schedule quoted to N-Mer at
the time N-Mer orders such Standard Custom Probe Arrays pursuant to Section 3.3;
provided, however, that such schedule will identify a time for completion that
is [***]. Affymetrix shall bill N-Mer for process development, design and layout
services for Standard Custom Probe Arrays at [***]. Affymetrix will make or
procure masks and bill N-Mer at a price equal to [***].

        3.2 New Process Custom Probe Array Design. Affymetrix shall use [***]
efforts to develop processes to manufacture New Process Custom Probe Arrays
pursuant to the Work Plan. After Affymetrix determines [***] the feasibility of
the manufacture of New Process Custom Probe Arrays pursuant to the Work Plan,
N-Mer may identify probe sequences for New Process Custom Probe Arrays. Upon
Affymetrix' receipt of such probe sequences and such [***] related information,
Affymetrix shall use [***] efforts to design, lay out, and procure masks for New
Process Custom Probe Arrays according to the schedule quoted to N-Mer at the
time N-Mer orders such New Process Custom Probe Arrays pursuant to Section 3.3;
provided, however, that such schedule shall provide for time periods [***].
Affymetrix shall bill N-Mer for design and layout services for New Process
Custom Probe Arrays at [***]. Affymetrix will make or procure masks and bill
N-Mer at a price equal to [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       5

        3.3    Custom Probe Array Supply.

        3.3.1  General. N-Mer shall procure its requirements of Custom Probe
               Arrays exclusively from Affymetrix; provided, however, that if
               Affymetrix is unable to supply Custom Probe Arrays under the
               terms and conditions of this Agreement, N-Mer shall have the
               right to [***]; and, provided further, [***]. Affymetrix shall
               use [***] efforts to deliver such quantities of the Custom Probe
               Arrays specified in a forecast made pursuant to Section 3.4 and
               in compliance with specifications [***] pursuant to the Work
               Plan. N-Mer shall have the right to purchase Custom Probe Arrays
               in any format size commercially available that is sold by
               Affymetrix to [***] or more Third Parties at the time of such
               purchase by N-Mer.

        3.3.2  Standard Custom Probe Arrays. N-Mer shall have the right to order
               its requirements of Standard Custom Probe Arrays from Affymetrix,
               provided that in such orders N-Mer will identify probe sequences
               for each Standard Custom Probe Array [***]. If the information
               received by Affymetrix does not include such [***] information,
               Affymetrix will advise N-Mer of any and all additional needed
               information. Affymetrix shall deliver such Standard Custom Probe
               Arrays according to the schedule quoted to N-Mer at the time
               N-Mer orders such Standard Custom Probe Arrays; provided,
               however, that such schedule will identify a time for completion
               that is [***]. Affymetrix shall supply such Standard Custom Probe
               Arrays using standard quality control procedures [***].

        3.3.3  New Process Custom Probe Arrays. After Affymetrix determines
               [***] the feasibility of the manufacture of New Process Custom
               Probe Arrays pursuant to the Work Plan, N-Mer shall have the
               right to order its requirements of New Process Custom Probe
               Arrays from Affymetrix, provided that in such orders N-Mer will
               identify probe sequences for each New Process Custom Probe Array
               [***]. If the information received by Affymetrix does not include
               such [***] information, Affymetrix will advise N-Mer of any and
               all additional needed information. Affymetrix shall deliver such
               New Process Custom Probe Arrays according to the schedule quoted
               to N-Mer at the time N-Mer orders such Standard Custom Probe
               Arrays; provided, however, that such schedule shall provide for
               delivery periods [***]. Affymetrix shall evaluate and manufacture
               New Process Custom Probe Arrays using quality control procedures
               that are [***]. To the extent the Project Coordination Committee
               agrees on additional quality control procedures applicable to New
               Process Custom Probe Arrays, Affymetrix shall use [***] efforts
               to comply with all such procedures.

        3.3.4  Quantities; Manufacturing Capacity. In no event will Affymetrix
               be obligated to provide more than [***] ([***] Probe Array/wafer
               format equivalent) Standard Custom Probe Arrays in any [***]
               period for research and development purposes, nor more than [***]
               ([***] Probe Array/wafer format equivalent) Standard Custom Probe
               Arrays in any [***] period for distribution to Third Parties
               unless mutually agreed to in writing. In no event will Affymetrix
               be obligated to provide

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       6

               more than the number of New Process Custom Probe Arrays that can
               be produced from the use of [***] percent ([***]%) of the
               capacity of [***] dedicated manufacturing line selected by
               Affymetrix in any [***] period for research and development
               purposes and [***] percent ([***]%) of the capacity of [***]
               dedicated manufacturing lines in any [***] period for
               commercialization purposes. Notwithstanding the foregoing,
               Affymetrix shall use [***] efforts to supply additional Custom
               Probe Arrays to N-Mer provided that such incremental supply [***]
               and, provided further, that if Affymetrix can not reasonably
               satisfy such incremental demand for Custom Probe Arrays [***],
               then Affymetrix shall use [***] efforts to expand capacity to
               supply such additional demand, provided that, to the extent
               capital equipment cumulatively costing more than [***] dollars
               ($[***]) is required by Affymetrix to provide for supply of New
               Process Custom Probe Arrays, then: (i) Affymetrix shall so notify
               N-Mer in writing of such requirements, including, without
               limitation, an itemized list of each piece of such equipment, its
               intended use, anticipated cost, and projected delivery date; (ii)
               upon N-Mer's written request, Affymetrix shall [***]; and (iii)
               Affymetrix shall [***]. Unless otherwise agreed by the Parties,
               the "[***] Term" for such N-Mer Equipment shall be the later of
               (i) [***] from the procurement by Affymetrix of such N-Mer
               Equipment or (ii) the last day of any [***] period after the
               [***] period referred to in the preceding clause during which
               such N-Mer Equipment [***]. All right, title and interest in, to
               and under such N-Mer Equipment shall be [***]. Notwithstanding
               anything in this Agreement to the contrary, N-Mer shall have no
               right to (i) [***], (ii) [***] or (iii) enter the premises of
               Affymetrix. [***]. During the [***] Term, Affymetrix shall use
               N-Mer Equipment [***].

        3.4 Forecasts. Beginning on the Effective Date and on the [***] during
the Term of this Agreement, N-Mer will provide a [***] forecast of Custom Probe
Arrays to be supplied by Affymetrix during the following [***] period. The
forecast will be provided according to a mechanism and on forms [***]. The [***]
of each such forecast shall constitute a firm order for the Custom Probe Arrays
set forth in [***]; provided, however, that Custom Probe Arrays shall only be
purchased by N-Mer in whole Lot increments and in quantities subject to Section
3.3.4. The [***] of such forecast will be for capacity planning purposes only,
and shall not constitute a firm order by N-Mer nor a commitment by Affymetrix.
Delivery times for all Custom Probe Arrays ordered hereunder will be quoted at
the time Affymetrix receives a firm order for such products and in compliance
with Section 3.3.

        3.5 Shipping; Title and Risk of Loss. Affymetrix shall pack Custom Probe
Arrays supplied under this Agreement in Affymetrix' standard shipping packages
and ship to the address specified by N-Mer. Unless otherwise mutually agreed to
in writing deliveries will be [***]. Affymetrix will ship via [***]. Title and
risk of loss or damage for deliveries will pass to N-Mer upon [***]. [***] will
pay all shipping costs, duties, and sales taxes.
[***].

        3.6 Permitted Uses. All Custom Probe Arrays purchased pursuant to this
Agreement may only be used within N-Mer's Area of Interest. N-Mer may not, and
will not allow any Third Party to: 1) transfer the Custom Probe Arrays provided
by Affymetrix pursuant to this Agreement to Third Parties other than (i) in the
course of distribution to end users pursuant to

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       7

[***] or (ii) in the event of termination of the Product Solicitation Agreement;
or 2) transfer to any Third Party [***] with Custom Probe Arrays supplied to
N-Mer for [***] purposes under this Agreement; or 3) provide [***] to any Third
Party using the Custom Probe Arrays provided by Affymetrix pursuant to this
Agreement; or 4) allow any Third Party to [***] the Custom Probe Arrays supplied
by Affymetrix to N-Mer under this Agreement except pursuant to distribution in
the event that (i) [***] or (ii) in the event of termination of the Product
Solicitation Agreement; or 5) [***], or otherwise use outside of N-Mer's Area of
Interest, the Probe Arrays delivered hereunder; or 6) [***] the Custom Probe
Arrays delivered hereunder, except that [***] is permitted for work performed
under the Work Plan or for otherwise permitted internal research and development
work performed by N-Mer; or 7) use or, [***], of the Custom Probe Arrays
delivered hereunder outside of the N-Mer Field. N-Mer and its Affiliates will
allow Affymetrix [***] access during regular business hours and with advance
written notice to ensure compliance with these prohibitions. The Custom Probe
Arrays transferred pursuant to this Agreement are not licensed for use in
violation of the above restrictions. In the event that N-Mer wishes to provide
for end users to be permitted to [***] using the Probe Arrays supplied
hereunder, Affymetrix will permit N-Mer to do so provided N-Mer shall [***].

        3.7 System Supply. N-Mer has the right to issue, upon execution of this
Agreement and from time to time thereafter, as approved by the Project
Coordination Committee, purchase orders for the System(s) and reagents that are
[***] required for N-Mer to perform its research and development activities as
permitted under this Agreement and the Product Solicitation Agreement. Such
System(s) and reagents shall be supplied at [***]. N-Mer shall be permitted to
use such Systems, including software and reagents, purchased at [***] in the
N-Mer Area of Interest. The supply of all other Systems and reagents for
commercial purposes shall be at [***]. N-Mer shall also be permitted to use such
Systems purchased hereunder at [***] in a manner consistent with the permitted
uses of such Systems when sold by Affymetrix to Third Parties customers.

4       PROPRIETARY RIGHTS

        4.1 No [***]. Until the end of the Term, N-Mer will [***]. This
paragraph shall not confer on N-Mer or any Third Party any rights under the
patent rights of Affymetrix.

        4.2 License Limitation. Except as otherwise stated herein, including,
without limitation, Sections 2.2, 2.3, 3.6 and 3.7, N-Mer acknowledges and
understands that no license is conveyed or implied for use of the Systems
herein.

        4.3 Covenant Not to Assert Inventions. N-Mer covenants not to assert the
patent rights in any [***] to the Probe Arrays supplied hereunder against
Affymetrix [***], for use outside of the N-Mer Field.

5       COMPENSATION

        5.1 For each Custom Probe Array delivered to N-Mer or its Affiliates for
researching and developing products in the N-MER Field, N-Mer will pay
Affymetrix [***] for such Probe

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       8

Arrays. For each Probe Array delivered to N-Mer or its Affiliates for
distribution to end users, N-Mer shall pay Affymetrix according to the following
formula:

        PER UNIT PROBE ARRAY PRICE = [***]

where [***] is calculated under general accepted accounting principles as
applied by [***]. For purposes of clarity, for capital equipment paid for by
N-Mer at the time such capital equipment is purchased, pursuant to Section 3.3,
the [***]. For the purposes of calculating the [***] described in the above
formula, Affymetrix will look to [***]. Notwithstanding the foregoing, in no
event shall Affymetrix charge N-Mer more than the following amounts for Standard
Custom Probe Arrays: $[***] per Standard Custom Probe Array in a [***] Probe
Array/wafer format; $[***] per Standard Custom Probe Array in a [***] Probe
Array/wafer format; $[***] per Standard Custom Probe Array in a [***] Probe
Array/wafer format and $[***] per Standard Custom Probe Array in a [***] Probe
Array/wafer format.

        5.2 Notwithstanding the foregoing or any provision to the contrary in
this Agreement, N-Mer will be responsible for any and all [***] for Probe Arrays
supplied to N-Mer hereunder, and the Probe Array fees described in Section 5.1
of this Agreement shall be exclusive of any such [***].

        5.3 All amounts referred to in this Section 5 will be invoiced by
Affymetrix when due. All Custom Probe Arrays supplied under this Agreement will
be deemed accepted unless they are returned to Affymetrix within [***] of
delivery to N-Mer, with written explanation of the basis on which such Probe
Arrays have been returned on Affymetrix' standard "Return Materials
Authorization" according to the procedures provided for in such Return Materials
Authorization, including, without limitation, [***]. All payments will be made
to Affymetrix [***] from the date of invoicing by Affymetrix. Late payments
shall earn interest at the rate equal to the lesser of [***] percent ([***]%)
per month or the maximum rate allowable under law. All payments in this
Agreement will be made in the form of a check or wire transfer to Affymetrix in
United States Dollars.

6       PROJECT COORDINATION

        6.1 The Parties will form a committee (the "Project Coordination
Committee" or "PCC") to aid in coordinating the performance of this Agreement,
including, without limitation, the Work Plan. The PCC will have general
responsibility for ensuring the performance of this Agreement pursuant to the
terms of this Agreement. The PCC shall be composed of two (2) representatives of
each of Affymetrix and N-Mer as each shall respectively appoint and be
reasonably acceptable to the other Party. Each Party by its representative(s)
shall cast one vote on the PCC. A quorum shall consist of at least one PCC
representative from each Party. The PCC shall act only with the [***]. A Party's
representatives shall serve at the discretion of such Party and may be
substituted for or replaced at any time by such Party. The PCC shall have its
first meeting within [***] after the Effective Date. Thereafter, the PCC shall
meet at least [***] during the Term, except at such times as the Parties
mutually believe there are no significant agenda items. The site of such
meetings shall alternate between the offices of Affymetrix and N-

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       9

Mer, (or any other site mutually agreed upon by the Parties) or be arranged by
video conference. The proceedings of all meetings of the PCC shall be prepared
alternately by the Parties, unless otherwise agreed, and sent to both Parties.
In the event that the PCC is unable to reach a decision by [***] with respect to
any matter and such inability continues for a period of [***] after the date on
which the matter is first submitted to the PCC, each Party shall refer the
matter to the Chief Executive Officers of Affymetrix and N-Mer for resolution.
Each Party shall set forth in writing a proposed solution to the impasse. If an
acceptable resolution is not achieved, either Party may choose to arbitrate the
issue(s) in accordance with Section 11.5.1. The Parties shall use reasonable
efforts to [***].

7       CONFIDENTIALITY

        7.1 For a period of [***] from following the expiration of this
Agreement, each Party shall maintain the Confidential Information of the other
Party in strict confidence (including the terms of this Agreement), and shall
not disclose, divulge, or otherwise communicate such Confidential Information of
the other, or use it for any purpose, except as permitted or contemplated by
this Agreement, and in order to carry out the terms and objectives of this
Agreement. Without limiting the foregoing, the Parties will use [***]
precautions to prevent and restrain the unauthorized disclosure of any
Confidential Information of the other Party. The provisions of this paragraph
shall not apply to Confidential Information which:

        7.1.1  was known or used by the receiving Party or its Affiliates
               without any restriction on disclosure, prior to its date of
               disclosure to the receiving Party, as evidenced by the prior
               written records of the receiving Party or its Affiliates; or

        7.1.2  either before or after the date of the disclosure to the
               receiving Party is lawfully disclosed without restriction on
               disclosure to the receiving Party or its Affiliates by an
               independent, unaffiliated Third Party rightfully in possession of
               the Confidential Information, provided that if such Confidential
               Information is provided to the receiving Party by a Third Party
               rightfully in possession of the Confidential Information, but
               with restrictions on disclosure, the receiving Party may use such
               Confidential Information in accordance with such restrictions of
               the Third Party;

        7.1.3  either before or after the date of the disclosure to the
               receiving Party becomes published or generally known to the
               public through no fault or omission of the receiving Party or its
               Affiliates;

        7.1.4  is required to be disclosed by the receiving Party or its
               Affiliates to comply with applicable laws, to comply with a court
               order, or to comply with governmental regulations, provided that
               the receiving Party provides prior written notice of such
               disclosure to the other Party and takes reasonable and lawful
               actions to avoid and/or minimize the degree of such disclosure;

        7.1.5  is independently developed by the receiving Party or its
               Affiliates without reference to the Confidential Information.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       10

        7.2 N-Mer may publish the results of use of the Probe Arrays after [***]
advance notice to the Project Coordination Committee as set forth in this
Section 7.2; provided, however, that in no event shall N-Mer publish Affymetrix'
Confidential Information without the prior written approval of Affymetrix.
Subject to the limitations of the foregoing and Section 3 above N-Mer may
publish the results of its research at its sole discretion. In the event that
N-Mer chooses to publish such results, if Affymetrix scientists have contributed
to such work, authorship will be according to scientific input and Affymetrix
will cooperate in such publications. If it is decided that publications will be
made pursuant to this Section, Affymetrix and N-Mer will provide the Project
Coordination Committee draft versions of all publications reporting results of
the use of the Probe Arrays, and will provide at least [***] for technical
review thereof, and will allow for removal of Confidential Information.

8       REPRESENTATIONS AND WARRANTIES

        8.1 Both Parties to this Agreement represent and warrant that they have
the full right and authority to enter into and perform this Agreement.

        8.2 Affymetrix represents and warrants that the Probe Arrays delivered
hereunder do not incorporate the [***] of a Third Party. EXCEPT FOR THE
FOREGOING SENTENCE, AFFYMETRIX DISCLAIMS ALL REPRESENTATIONS AND WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
RELATING TO INTELLECTUAL PROPERTY, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR
PURPOSE. With respect to Third Party tort claims that arise from the use,
handling or storage of the products supplied to N-Mer pursuant to this
Agreement, Affymetrix shall [***].

9       INDEMNITY

        9.1 Indemnity by Affymetrix. Affymetrix shall indemnify, defend and hold
N-Mer and its Affiliates, successors-in-interest, assigns, agents, employees,
officers and directors (the "N-Mer Indemnitees") harmless from and against any
and all liability, damage, loss, cost or expense (including reasonable
attorneys' fees) arising out of Third Party claims or suits related to: (i)
Affymetrix' performance of, or failure to perform, its obligations under this
Agreement; (ii) breach by Affymetrix of its representations and warranties under
this Agreement; or (iii) any suit or proceeding brought against N-Mer or its
Affiliates to the extent based on a claim that [***]; provided, however, that
Affymetrix' obligations pursuant to this Section 9.1 will not apply to the
extent such claims or suits result from the gross negligence or willful
misconduct of any of the N-Mer Indemnitees. Affymetrix will settle or defend any
suit or proceeding brought against N-Mer to the extent based on a claim that the
Probe Arrays delivered hereunder [***]. Affymetrix shall have no liability under
this paragraph to the extent that [***] ("Non-Covered Claims"). Notwithstanding
the foregoing, Affymetrix will have no obligation to defend or indemnify the
N-Mer Indemnitees with respect to Third Party claims arising out of breach by
N-Mer of its representations and warranties set forth in this Agreement.

        9.2 Indemnity by N-Mer. N-Mer shall indemnify, defend and hold
Affymetrix and its Affiliates, successors-in-interest, assigns, agents,
employees, officers and directors (the "Affymetrix Indemnitees") harmless from
and against any and all liability, damage, loss, cost or

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       11

expense (including reasonable attorneys' fees) arising out of Third Party claims
or suits related to: (i) N-Mer's performance of, or failure to perform, its
obligations under this Agreement; (ii) breach by N-Mer of its representations
and warranties under this Agreement; (iii) any suit or proceeding based on [***]
brought against Affymetrix for Non-Covered Claims; provided, however, that
N-Mer's obligations pursuant to this Section 9.2 will not apply to the extent
such claims or suits result from the gross negligence or willful misconduct of
any of the Affymetrix Indemnitees. Notwithstanding the foregoing, N-Mer will
have no obligation to defend or indemnify the Affymetrix Indemnitees with
respect to Third Party claims arising out of breach by Affymetrix of its
representations and warranties set forth in this Agreement.

        9.3 Conditions to Indemnification. As a condition to a Party's right to
receive indemnification under this Section 9, it shall: (i) promptly notify
("Claim Notice") the other Party as soon as it becomes aware of a claim or suit
for which indemnification may be sought pursuant hereto (provided that the
failure to give a Claim Notice promptly shall not prejudice the rights of an
indemnified Party except to the extent that the failure to give such prompt
notice materially adversely affects the ability of the indemnifying Party to
defend the claim or suit); (ii) cooperate with the indemnifying Party in the
defense of such claim or suit, at the expense of the indemnifying Party; and
(iii) if the indemnifying Party confirms in writing to the indemnified Party its
intention to defend such claim or suit within [***] of receipt of the Claim
Notice, permit the indemnifying Party to control the defense of such claim or
suit, including without limitation the right to select defense counsel; provided
that if the indemnifying Party fails to (x) provide such confirmation in writing
within the [***] period; or (y) diligently and reasonably defend such suit or
claim at any time, its right to defend the claim or suit shall terminate
immediately in the case of (x) and otherwise upon [***] written notice to the
indemnifying Party and the indemnified Party may assume the defense of such
claim or suit at the sole expense of the indemnifying Party and may settle or
compromise such claim or suit without the consent of the indemnifying Party. In
no event, however, may the indemnifying Party compromise or settle any claim or
suit in a manner which admits fault or negligence on the part of any indemnified
Party or that otherwise materially affects such indemnified Party's rights under
this Agreement or requires any payment by an indemnified Party without the prior
written consent of such indemnified Party. Subject as expressly provided above,
the indemnifying Party will have no liability under this Section 10 with respect
to claims or suits settled or compromised without its prior written consent.
Affymetrix' liability under Section 9.1(iii) shall be limited to [***]. N-Mer's
liability under Section 9.2(iii) shall be limited to [***]. In the event that
the Probe Arrays [***]. This paragraph states the entire liability for [***] and
is in lieu of all other warranties, express or implied except as stated in
Section 8.

10      TERM AND TERMINATION

        10.1 This Agreement shall extend until the end of the Term unless
terminated earlier by a Party for cause by written notice if the other Party (or
its Affiliate) materially breaches any material provision of this Agreement and
fails to substantially cure such breach within [***] of written notice
describing the breach and the intent of the notifying Party to terminate the
Agreement in the event such breach is not substantially cured.

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       12

        10.2 Upon termination of this Agreement, the following provisions will
survive: Sections 1, 7, 8, 9 and 11 (in their entirety) and Sections 3.6, 4.2,
4.3 and 10.2.

11      MISCELLANEOUS

        11.1 N-MER UNDERSTANDS THAT THE PROBE ARRAYS DELIVERED HEREUNDER ARE NOT
FDA APPROVED. N-MER AGREES NOT TO USE THE PROBE ARRAYS DELIVERED HEREUNDER IN
ANY CLINICAL OR OTHER SETTING REQUIRING FDA REVIEW OR APPROVAL. [***]. THE PROBE
ARRAYS AND SYSTEMS ARE NOT LICENSED EXCEPT AS SPECIFICALLY RECITED HEREIN UNDER
ANY INTELLECTUAL PROPERTY RIGHTS OF AFFYEMTRIX.

        11.2 Neither Party nor any of its Affiliates shall issue any press
release or otherwise publicly disseminate any information relating to this
Agreement without the prior written approval of the other Party, [***], or
except as otherwise required by law.

        11.3 Neither this Agreement nor the rights, interests or obligations of
either Party may be assigned by such Party without the prior written consent of
the other Party, which shall not be unreasonably withheld, conditioned or
delayed. Notwithstanding the foregoing, Affymetrix may assign any rights or
obligations of this Agreement to a Party who acquires all or substantially all
of the assets of the business of Affymetrix to which this Agreement relates by
merger or sale of assets or otherwise. For purposes of clarity, any [***] shall
be deemed to be a transfer of rights and obligations hereunder. Any attempted or
purported assignment in violation of the foregoing shall be void. Subject to the
foregoing, this Agreement shall be binding upon and inure to the benefit of the
successors and permitted assigns of each Party hereto.

        11.4 This Agreement shall be construed according to the laws of
California without regard to conflict of law provisions.

        11.5

               11.5.1 In the event of any controversy or claim relating to,
               arising out of or in any way connected to any provision of this
               Agreement ("Dispute"), the Parties shall seek to settle their
               differences amicably between themselves. Any unresolved Dispute
               shall be finally resolved by final and binding arbitration.
               Whenever a Party shall decide to institute arbitration
               proceedings, it shall give written notice to that effect to the
               other Party. The Party giving such notice shall refrain from
               instituting the arbitration proceedings for a period of [***]
               following such notice to allow the Parties to attempt to resolve
               the Dispute between themselves. If the Parties are still unable
               to resolve the dispute, the Party giving notice may institute the
               arbitration proceeding. The procedure for the arbitration will be
               as follows: 1. [***] arbitrator will be chosen in accordance with
               the arbitration selection rules of JAMS. The selection process
               will take a maximum of [***]. 2. The arbitration will take place
               under JAMS rules to the extent the rules are not superceded by
               the agreements of the party to arbitrate or any agreed limitation
               on damages. 3. The letter of allegation and a response shall be
               filed with [***] arbitrator within [***] of the selection and
               agreement of [***] arbitrator to participate. 4. The Parties

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       13

               agree that [***] in connection with any arbitration that may take
               place pursuant to this Section 11.5.1 and, therefore, the Parties
               and [***] arbitrator shall use their [***] efforts to conclude
               the arbitration, including the issuance of any award resulting
               therefrom, within a maximum of [***] from the time of the filing
               of the complaint or letter of allegation with [***] arbitrator.
               5. The arbitration shall take place in the San Francisco Bay
               Area. 6. [***]. 7. [***]. Judgment on the award of [***]
               arbitrator may be entered in the Superior Court of Santa Clara
               County in the State of California. All Parties admit to the
               jurisdiction of the Superior Court of Santa Clara County in the
               State of California for purposes of enforcement of the award of
               [***] arbitrator and compelling arbitration in accordance with
               this Section 11.5.1. Except to the extent entry of judgment and
               any subsequent enforcement may require disclosure, all matters
               relating to the arbitration, including the award, shall be held
               in confidence by the Parties. Nothing in this Section 11.5.1
               shall be construed to preclude a Party from seeking injunctive
               relief in a court of law for a breach of Section 7 where absent
               such relief such Party would suffer irreparable harm. [***].

        11.6 The waiver by either Party of a breach or a default of any
provision of this Agreement by the other Party shall not be construed as a
waiver of any succeeding breach of the same or any other provision, nor shall
any delay or omission on the part of either Party to exercise or avail itself of
any right power or privilege that it has or may have hereunder operate as a
waiver of any right, power or privilege by such Party.

        11.7 This Agreement and the documents referred to herein, together with
the Letter Agreement, dated as of the date hereof, among Affymetrix, N-Mer,
Callida Genomics, Inc. and Hyseq, Inc., are the full understanding of the
Parties with respect to the subject matter hereof and supersede all prior
understandings and writings relating to the subject matter herein. No waiver
alteration or modification of any of the provisions herein shall be binding
unless in writing and signed by the Parties.

        11.8 The headings in this Agreement are for convenience only and shall
not be considered in construing this Agreement.

        11.9 In the event that any provision of this Agreement is held by a
court of competent jurisdiction to be unenforceable because it is invalid or in
conflict with any law of any relevant jurisdiction, the validity of the
remaining provisions shall not be affected, and the rights and obligations of
the Parties shall be construed and enforced as if the Agreement did not contain
the particular provision(s) held to be unenforceable.

        11.10 None of the provisions of this Agreement shall be for the benefit
of or enforceable by any Third Party.

        11.11 Any notice required under this Agreement shall be made by
overnight mail or courier to the addresses below.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       14

        If to N-Mer:

               N-Mer, Inc.
               670 Almanor Avenue
               Sunnyvale, CA 94086
               Attn: Dr. Radoje Drmanac
               Facsimile Number:   (408) 524-8141

        If to Affymetrix:

               Affymetrix, Inc.
               3380 Central Expressway
               Santa Clara, California 95051
               Attn: General Counsel
               Facsimile Number: (408) 731-5392

        11.12 "Force Majeure" shall mean an Act of God, flood, fire, explosion,
earthquake, strike, lockout, casualty or accident, war, civil commotion, act of
public enemies, blockage or embargo, or any injunction, law, order proclamation,
regulation, ordinance, demand or requirement of any government or any
subdivision, authority representative thereof, or the inability, after all
commercially reasonable efforts have been made, to procure materials, labor,
equipment, transportation or energy sufficient to meet manufacturing needs
without the necessity of allocation, or any other cause whatsoever, whether
similar or dissimilar to those enumerated above, which are beyond the reasonable
control of such Party, which the Party affected has used its reasonable best
efforts to avoid, and which prevent, restrict or interfere with the performance
by a Party of its obligations hereunder. The Party affected by Force Majeure
shall give notice to the other Party promptly in writing and whereupon shall be
excused from those obligations hereunder, to the extent of such prevention,
restriction or interference, provided that the affected Party shall use its
[***] efforts to overcome, avoid or remove such cause(s) of non-performance and
shall continue performance whenever such cause(s) is removed with all possible
speed. Nothing herein shall be deemed to require any Party to settle on terms
unsatisfactory to such Party with regard to any [***].

        11.13 This Agreement may be executed in any number of counterparts, each
of which shall be deemed an original but all of which together shall constitute
one and the same instrument.

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       15

        IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
executed by their properly and duly authorized officers or representatives as
set forth below.

Affymetrix, Inc.

By:     /s/ Barbara A. Caulfield
       ---------------------------------------------

Name:   Barbara A. Caulfield
       ---------------------------------------------

Title:  Executive Vice President and General Counsel
       ---------------------------------------------

Date:   October 24, 2001
       ---------------------------------------------

N-Mer, Inc.

By:     /s/ George B. Rathmann
       ---------------------------------------------

Name:   George Rathmann
       ---------------------------------------------

Title:  Chairman and Interim Chief Executive Officer
       ---------------------------------------------

Date:   October 24, 2001
       ---------------------------------------------

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       16

                                    EXHIBIT A
                             COLLABORATIVE WORK PLAN

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                      A-1

INITIAL WORK PLAN FOR N-MER COMPANY

[***]

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                      A-2

                                    EXHIBIT B
                          EXISTING AFFYMETRIX PRODUCTS

[***]

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     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                      B-1

                                                                   EXHIBIT 10.23

                         PRODUCT SOLICITATION AGREEMENT

                                     BETWEEN

                                   N-MER, INC.

                                       AND

                                AFFYMETRIX, INC.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                         PRODUCT SOLICITATION AGREEMENT

        This Product Solicitation Agreement (this "Agreement"), dated as of this
24th day of October 2001, by and between N-Mer, Inc., a Delaware corporation
having its principal place of business at 670 Almanor Avenue, Sunnyvale,
California 94085 (the "Company"), and Affymetrix, Inc., a Delaware corporation
having its principal place of business at 3380 Central Expressway, Santa Clara,
California 95051 ("Affymetrix"). The Company and Affymetrix will be referred to
individually as a "Party" or collectively as the "Parties."

        1. SCOPE OF ENGAGEMENT.

               1.1 On the terms and conditions of this Agreement, the Company
hereby engages Affymetrix for the term of this Agreement as the exclusive sales
agent to solicit and procure orders throughout the world for the Company's
products (the "Products"); provided, however, that the Company shall have the
right pursuant to Section 1.2 to [***] basis in which case Affymetrix shall be
engaged by the Company as the [***] sales agent to solicit and procure orders
throughout the world for the Products as set forth in Section 1.2.

               1.2 If the Company determines [***] that Affymetrix is in
material breach of Section 4.1 of this Agreement, the Company shall provide
Affymetrix written notice of such determination and shall set forth in such
notice [***] the basis for such determination. Upon receipt of such notice,
representatives of the Company and Affymetrix shall meet as appropriate for a
period not to exceed [***] commencing on the date Affymetrix receives such
notice to discuss whether Affymetrix is in material breach of Section 4.1 of
this Agreement and to define in good faith the [***] to be performed and
achieved by Affymetrix in the Maintenance Period (as defined below) in order to
cure such alleged material breach. Such [***] shall be [***] by Affymetrix and
the Company and shall be [***] of exclusive sales agents of products similar to
the Products and consistent with the terms of this Agreement. In the event that
representatives of the Company and Affymetrix are unable to agree [***] during
such [***] period, the Company may initiate arbitration in respect of such
dispute in accordance with Section 11.7 for the purpose of having the arbitral
tribunal determine, within [***], whether Affymetrix is in material breach of
Section 4.1 of this Agreement and, if so, the appropriate [***] to be performed
and achieved by Affymetrix during the Maintenance Period in order to cure such
alleged material breach. The "Maintenance Period" shall be a period of [***]
commencing on the date that the [***] are agreed between the parties or
determined by the arbitral tribunal. Affymetrix shall [***] agreed between the
parties or determined by the arbitral tribunal pursuant to this Section 1.2
during the Maintenance Period, and the Company shall [***] with Affymetrix and
[***] in order to enable Affymetrix to [***]. In the event that the Company
determines in good faith that Affymetrix has not [***] agreed between the
parties or determined by the arbitral tribunal pursuant to this Section 1.2
during the Maintenance Period and is in material breach of Section 4.1 of this
Agreement (and Affymetrix does not agree with such determination), the Company
shall have the right to initiate arbitration in respect of such dispute in
accordance with Section 11.7; provided, however, that the Company and Affymetrix
shall have the right to have such dispute heard by the same arbitrator that
determined the [***] by Affymetrix during the Maintenance

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

Period (if [***] were determined by arbitration) and, provided further, that the
Parties agree that [***] in connection with any such arbitration and the Parties
shall use their [***] efforts to conclude such arbitration, including the
issuance of any award resulting therefrom, within [***] of the initiation of
such arbitration. Following the expiration of the Maintenance Period and upon
initiation of arbitration by the Company as set forth in the preceding sentence,
the exclusive sales agency set forth in this Agreement shall [***] only until a
final determination of the arbitrator is delivered. In the event that the
arbitral tribunal determines that Affymetrix has not [***] agreed between the
parties or determined by the arbitral tribunal pursuant to this Section 1.2
during the Maintenance Period and is in material breach of Section 4.1 of this
Agreement, then the arbitral tribunal shall provide in its award that the
exclusive sales agency shall [***]. For purposes of clarity, the Company shall
engage Affymetrix as the exclusive sales agent for the Products until the
parties agree otherwise, or until [***]. The terms and conditions of Affymetrix'
[***] sales agent relationship with the Company, [***], shall be [***].

               1.3 Subject to the Company's then current policies (including the
Company's then current credit policies), the Company shall accept [***] orders
submitted by Affymetrix for the Products upon the Company's [***] terms and
conditions unless the Company is unable to fill such orders using its [***]
efforts.

               1.4 All Product sales pursuant to an order submitted by
Affymetrix shall be at the [***] price prescribed by the Company pursuant to
Section 5.3 for such Product, [***].

               1.5 No orders shall be binding on the Company unless and until
accepted by the Company in accordance with the Company's then current policies
and the terms of this Agreement. Affymetrix shall have no right, power or
authority to bind the Company to any order or other obligation.

               1.6 Affymetrix shall have the right to appoint sub-agents, [***].

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       2

        2. TRADEMARK LICENSE. During the term of this Agreement, subject to the
terms and conditions of this Agreement, the Company grants to Affymetrix a
nonexclusive, worldwide, royalty free license solely to use the service marks,
trademarks, tradenames and any other designations used by the Company in
connection with the Products (collectively, the "Marks"), and the goodwill
associated with such Marks, in connection with Affymetrix' solicitation and
procurement of orders for the Products hereunder; provided, however, that
Affymetrix shall use its [***] efforts to comply with the Company's [***]
trademark policy in Affymetrix' use of the Marks. The Company shall have the
right to audit and inspect, upon advance written notice and during regular
business hours, Affymetrix' use of the Marks.

        3. SERVICE AND SUPPORT. The Company and Affymetrix will cooperate in
good faith to provide service and support to all customers who purchase Products
under orders submitted by Affymetrix, including, without limitation, the
following: (i) the Company shall train one (1) Affymetrix representative,
appointed by Affymetrix and reasonably acceptable to the Company, in the basic
operation of the Products such that such representative is sufficiently skilled
to train other Affymetrix representatives to adequately refer service and
support needs to the appropriate Party; (ii) Affymetrix shall be the principal
contact for customer service and its trained representatives shall refer the
service call to the appropriate Party as follows: the Company shall have the
principal obligation and shall use [***] efforts to provide the service and
customer support for components of the Products not purchased from Affymetrix
pursuant to the Product Development and Supply Agreement, dated as of the date
hereof (the "Supply Agreement"), between the Company and Affymetrix, and
Affymetrix shall have the primary obligation and shall use [***] efforts to
provide service and support for components of the Product purchased by the
Company from Affymetrix. The parties will provide service and support for their
respective components of the Products upon terms and conditions [***].

        4. DUTIES OF AFFYMETRIX.

               4.1 For so long as Affymetrix is the Company's exclusive [***]
sales agent pursuant to Section 1, Affymetrix shall use its [***] efforts to
solicit and procure orders for the Products, including, without limitation, to
(i) distribute the marketing material and other information provided by the
Company pursuant to Section 5.2; and (ii) to provide [***], including, without
limitation, [***], to its sales personnel and third party agents that are
comparable to [***] provided for other similar products sold by or on behalf of
Affymetrix.

               4.2 Whenever Affymetrix procures an order for the Products from a
customer, Affymetrix shall within [***] after Affymetrix' receipt of such order,
forward such order to the Company in such manner as is reasonably determined by
the Company. Each such order shall be in the form of a purchase order as
mutually agreed to by the Parties for Products, and shall contain all
information required to be completed on such form.

               4.3 Subject to Section 5.3, Affymetrix shall [***] quote the
[***] prices and terms for the Products [***] from the Company.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       3

               4.4 Affymetrix shall make no representations or warranties
relating to the Products or the Company, except for those that the Company
expressly makes in writing to end-users regarding Products and those otherwise
expressly authorized in writing by the Company.

        5. DUTIES OF THE COMPANY.

               5.1 For so long as Affymetrix is the Company's exclusive sales
agent pursuant to Section 1, the Company shall not solicit or procure orders for
the Products (except through Affymetrix pursuant to this Agreement) nor shall it
appoint any other agents in relation to solicitation or procurement of orders
for the Products.

               5.2 The Company shall market and promote the Products and shall
provide Affymetrix with [***] quantities of any applicable printed and soft copy
(suitable for display on the web) marketing materials for the Products.
Affymetrix will cooperate [***] with the Company to [***] all marketing and
promotional materials regarding products supplied to the Company under the
Supply Agreement or otherwise incorporating Affymetrix trademarks. Affymetrix
shall have the right to use such materials in a reasonable manner solely in
connection with its solicitation and procurement of orders for the Products
pursuant to this Agreement. Affymetrix shall not alter or modify such marketing
materials except by prior written agreement of the Company.

               5.3 The Company shall inform Affymetrix within [***] of any [***]
changes in the price for the Products. At any time after Affymetrix ceases to be
the [***] sales agent of the Company, the Company shall inform Affymetrix within
[***] of the acceptance of a purchase order from an end user for Products [***].
Upon such notice, Affymetrix shall [***].

               5.4 The Company shall use commercially reasonable efforts to
provide Affymetrix with [***] prior written notice of any material changes to
product specifications, manufacturing methods, and marketing and sale
documentation (excluding such changes made by Affymetrix that relate to
components purchased from Affymetrix).

               5.5 The Company shall ship to the end user all Products sold
pursuant to complete orders submitted by Affymetrix and accepted by the Company
pursuant to the terms of this Agreement.

               5.6 The Company represents and warrants to Affymetrix that the
Products (excluding components purchased from Affymetrix) are manufactured in
accordance with all applicable laws and regulations [***]; provided, however,
that the Company's liability under this sentence shall be limited to [***]
During the term of this Agreement, the Company shall maintain product liability
insurance with limits of coverage in an amount [***].

        6. COMMISSION.

               6.1 The Company shall pay Affymetrix a commission equal to [***]
percent ([***]%) of the Commissionable Invoice Price (as defined below) on the
sale of each Product pursuant to an order submitted by Affymetrix. For purposes
of determining when a sale of a

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       4

Product occurs, the sale shall be deemed to occur on the date of shipment of the
Product to the purchaser of the Product. All commission payments shall be made
within [***] of the end of each [***] in which the sale was made. For purposes
of calculating the commission payable by the Company to Affymetrix hereunder,
the Commissionable Invoice Price shall mean the invoice price of each Product
([***]) less the price paid by the Company to Affymetrix for the components of
each Product purchased from Affymetrix.

               6.2 Each commission payment shall be accompanied by a report
setting forth the Products sold in the previous month, the name of the
purchaser, and the quantity and date of Product purchased, the date of shipment
and calculations used to determine such commissions. The parties agree to
develop mutually satisfactory forms and systems as mutually deemed appropriate
to facilitate the tracking and calculation of Commissionable Invoice Price. Such
reports and all information contained therein shall be Confidential Information
of the Company and subject to the confidentiality obligations of this Agreement,
including, without limitation, Section 10 of this Agreement.

               6.3 The Company shall prepare and keep complete, and accurate
records of all Product purchases and the commissions due therefrom.

               6.4 The Company shall permit an independent certified public
accounting firm of nationally recognized standing appointed by Affymetrix, and
reasonably acceptable to the Company, to examine and audit the Company's records
during reasonable business hours upon at least [***] prior written notice and no
more frequently than [***] per year to the extent necessary to verify the
accuracy of the reports delivered under Section 6.2 above. If such an audit
correctly uncovers a deficiency in payment of commissions payable by the Company
hereunder, the Company shall [***] pay such deficient amount, and if the amount
of any such deficiency is greater than [***] percent ([***]%) of the total
amount due during the audited period, the Company shall bear the reasonable out
of pocket expenses of such accounting firm to conduct such audit, otherwise
Affymetrix shall bear the costs of such audit.

        7. TERM OF AGREEMENT.

               7.1 This Agreement shall become effective on the Closing Date (as
such term is defined in the Preferred Stock Purchase Agreement, dated as of the
date hereof, among Affymetrix, Callida Genomics, Inc. and Hyseq, Inc.) and shall
continue unless terminated in accordance with the terms and conditions hereof.

               7.2 This Agreement may be terminated by either Party for cause by
written notice if the other Party materially breaches any provision of this
Agreement and fails to substantially cure such breach within [***] of written
notice describing the breach and the intent of the notifying Party to terminate
this Agreement in the event such breach is not substantially cured; provided
however, that the [***] in accordance with Section 1.2 of this Agreement shall
not give rise to termination of this Agreement.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       5

               7.3 At any time after the expiration of the Option (as such term
is defined in the Option Agreement, dated as of the date hereof, among the
Company, Callida Genomics, Inc. and Affymetrix) and after Affymetrix has [***]
in accordance with Section 1.2, either Party shall have the right to terminate
this Agreement upon [***] written notice of their intention to do so provided
the cumulative amount of Net Sales of Products procured by Affymetrix is less
than $[***] and the Net Sales of Products procured by Affymetrix in the
preceding [***] period is less than $[***]. The term "Net Sales" means the
amounts received by the Company from all sales procured by Affymetrix of any
Product, including non-cash consideration, which shall be reflected in the
Company's books and records maintained in accordance with the accounting
principles used by the Company consistently applied across all of its products,
less the following deductions with respect to such sale, to the extent included
in the amounts invoiced or subsequently actually allowed and taken: [***]. A
"sale" shall exclude [***].

               7.4 The termination of this Agreement shall not release the
Company from the obligation to pay any sum that may be owing to Affymetrix
(whether then or thereafter due) or operate to discharge any liability that had
been incurred by the Company prior to any such termination. Any termination of
this Agreement shall not be an exclusive remedy, but shall be in addition to any
legal or equitable remedies available. Sections 6 (only to the extent the
Company has accepted orders from Affymetrix before such termination or
expiration), 7.4, 8, 9, 10 and 11 shall survive any termination or expiration of
this Agreement.

        8. DISCLAIMER; INDEMNITY.

               8.1 EXCEPT AS OTHERWISE PROVIDED HEREIN, NEITHER PARTY MAKES ANY
WARRANTIES TO THE OTHER PARTY WITH RESPECT TO THE PRODUCTS AND SERVICES AND EACH
DISCLAIMS ALL IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY,
FITNESS FOR USE OR PARTICULAR PURPOSE AND NONINFRINGEMENT. EXCEPT AS OTHERWISE
PROVIDED HEREIN, NEITHER PARTY ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME
FOR IT ANY LIABILITY IN CONNECTION WITH THE SALE OR USE OF THE PRODUCTS.

               8.2 The Company shall indemnify and hold Affymetrix and its
directors, officers and employees (the "Affymetrix Indemnitees") harmless from
and against all losses, liabilities, damages and expenses (including reasonable
attorneys' fees and costs) resulting from all claims, demands, actions and other
proceedings ("Claims") by any unaffiliated third party to the extent arising
from (a) the breach of any representation, warranty or covenant of the Company
under this Agreement, or (b) [***] liability caused by [***], except in each
case to the extent caused by the breach of any representation, warranty or
covenant of Affymetrix under this Agreement or the gross negligence or willful
misconduct of the Affymetrix Indemnitees or in the event that such Claims are
caused by the components of each Product purchased from Affymetrix.

               8.3 Affymetrix shall indemnify and hold the Company and its
directors, officers and employees (the "Company Indemnitees") harmless from and
against all losses,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       6

liabilities, damages and expenses (including reasonable attorneys' fees and
costs) resulting from all claims, demands, actions and other proceedings by any
unaffiliated third party to the extent arising from the breach of any
representation, warranty or covenant of Affymetrix under this Agreement, except
in each case to the extent caused by the breach of any representation, warranty
or covenant of the Company under this Agreement or the gross negligence or
willful misconduct of the Company Indemnitees.

               8.4 A Party (the "Indemnitee") that intends to claim
indemnification under this Section 8 shall promptly notify the other Party (the
"Indemnitor") of any claim, demand, action or other proceeding for which the
Indemnitee intends to claim such indemnification. The Indemnitor shall have the
right to participate in, and to the extent the Indemnitor so desires jointly
with any other indemnitor similarly noticed, to assume the defense thereof with
counsel selected by the Indemnitor; provided, however, that the Indemnitee shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the Indemnitor, if representation of the Indemnitee by the counsel retained
by the Indemnitor would be inappropriate due to actual or potential differing
interests between the Indemnitee and any other party represented by such counsel
in such proceedings. The indemnity obligations under this Section 8 shall not
apply to amounts paid in settlement of any claim, demand, action or other
proceeding if such settlement is effected without the prior express written
consent of the Indemnitor, [***]. The failure to deliver notice to the
Indemnitor within a reasonable time after notice of any such claim or demand, or
the commencement of any such action or other proceeding, if prejudicial to its
ability to defend such claim, demand, action or other proceeding, shall relieve
such Indemnitor of any liability to the Indemnitee under this Section 8 with
respect thereto, but the omission so to deliver notice to the Indemnitor shall
not relieve it of any liability that it may have to the Indemnitee otherwise
than under this Section 8. The Indemnitor may not settle or otherwise consent to
an adverse judgment in any such claim, demand, action or other proceeding, that
diminishes the rights or interests of the Indemnitee, or admits liability or
fault of the Indemnitee, without the prior [***] written consent of the
Indemnitee, [***]. The Indemnitee, its employees and agents, shall reasonably
cooperate with the Indemnitor and its legal representatives in the investigation
of any claim, demand, action or other proceeding covered by this Section 8.

        9. LIABILITY LIMITATION.

        EXCEPT AS SPECIFIED UNDER SECTION 8, NEITHER PARTY WILL BE LIABLE UNDER
ANY SECTION OR SUBJECT MATTER OF THIS AGREEMENT OR UNDER ANY CONTRACT,
NEGLIGENCE, STRICT LIABILITY OR OTHER LEGAL OR EQUITABLE THEORY FOR ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES.

        10. CONFIDENTIALITY.

               10.1 For a period of [***] from following the expiration of this
Agreement, each Party shall maintain the Confidential Information of the other
Party (including the terms of this Agreement) in strict confidence, and shall
not disclose, divulge, or otherwise communicate such Confidential Information of
the other, or use it for any purpose, except as permitted by this Agreement, and
in order to carry out the terms and objectives of this Agreement; provided,

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       7

however, that such disclosure shall be solely to: (i) employees who need to know
such Confidential Information in order to perform the receiving Party's
obligations under this Agreement; and (ii) solely upon prior written notice to,
and approval by, the disclosing Party, to third party consultants who are bound
by confidentiality obligations at least as strict as those set forth in this
Agreement. Without limiting the foregoing, the parties will use any and all
[***] precautions to prevent and restrain the unauthorized disclosure of any
Confidential Information of the other Party. The provisions of this paragraph
shall not apply to Confidential Information which:

               (a) was known or used by the receiving Party or its affiliates
without any restriction on disclosure, prior to its date of disclosure to the
receiving Party, as evidenced by the prior written records of the receiving
Party or its affiliates; or

               (b) either before or after the date of the disclosure to the
receiving Party is lawfully disclosed without restriction on disclosure to the
receiving Party or its affiliates by an independent, unaffiliated third party
rightfully in possession of the Confidential Information, provided that if such
Confidential Information is provided to the receiving Party by a third party
rightfully in possession of the Confidential Information, but with restrictions
on disclosure, the receiving Party may use such Confidential Information in
accordance with such restrictions of the third party;

               (c) either before or after the date of the disclosure to the
receiving Party becomes published or generally known to the public through no
fault or omission of the receiving Party or its affiliates;

               (d) is required to be disclosed by the receiving Party or its
affiliates to comply with applicable laws, to comply with a court order, or to
comply with governmental regulations, provided that the receiving Party provides
prior written notice of such disclosure to the other Party and takes [***]
actions to avoid and/or minimize the degree of such disclosure; or

               (e) is independently developed by the receiving Party or its
affiliates without reference to the Confidential Information.

        11. MISCELLANEOUS.

               11.1 Neither Party nor any of its affiliates shall issue any
press release or otherwise publicly disseminate any information relating to this
Agreement without the prior written approval of the other Party, [***], or
except as otherwise required by law.

               11.2 Each Party represents and acknowledges that it has read this
Agreement and fully understands and agrees to its terms, and that each Party has
been represented by counsel in connection with the negotiation and execution of
this Agreement.

               11.3 This Agreement may be executed in counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       8

               11.4 This Agreement shall be construed according to the laws of
California without regard to conflict of law provisions.

               11.5 Any notice, requests, delivery, approval or consent required
or permitted to be given under this Agreement shall be in writing and shall be
deemed to have been sufficiently given if delivered to the Party to whom it is
directed at its address shown below or such other address as such Party shall
have last given by notice to the other Party (referred to herein as "notice").
All notices shall be effective upon receipt.

        If to the Company, addressed to:

                      N-Mer, Inc.
                      670 Almanor Avenue
                      Sunnyvale, CA 94086
                      Attn: Dr. Radoje Drmanac
                      Facsimile Number:   (408) 524-8141

        If to Affymetrix, addressed to:

                      Affymetrix, Inc.
                      3380 Central Expressway
                      Santa Clara, California 95051
                      Attn:  General Counsel
                      Fax:  (408) 481-4709

               11.6 Affymetrix may assign any rights or obligations of this
Agreement to a party who acquires all or substantially all of the assets of
Affymetrix or of that part of the business of Affymetrix to which this Agreement
relates by merger or sale of assets or otherwise. The Company may not assign or
transfer any rights or obligations of this Agreement by merger or sale of assets
or otherwise to a third party or its affiliates without the prior written
consent of Affymetrix which must be obtained and will not be unreasonably
withheld or delayed. For purposes of clarity, any [***] shall be deemed to be a
transfer of rights and obligations hereunder. Any attempted or purported
assignment in violation of the foregoing shall be void. This Agreement shall
inure to the benefit of, and be binding upon, the Parties and their successors
and permitted assigns. Except as otherwise expressly provided herein, the rights
and obligations hereunder may not be assigned or delegated by any Party hereto
without the prior written consent of each other Party hereto.

               11.7 ARBITRATION. In the event of any controversy or claim
relating to, arising out of or in any way connected to any provision of this
Agreement ("Dispute"), the Parties shall seek to settle their differences
amicably between themselves. Any unresolved Dispute shall be finally resolved by
final and binding arbitration. Whenever a Party shall decide to institute
arbitration proceedings, it shall give written notice to that effect to the
other Party. The Party giving such notice shall refrain from instituting the
arbitration proceedings for a period of [***] following such notice to allow the
Parties to attempt to resolve the Dispute between

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       9

themselves. If the Parties are still unable to resolve the dispute, the Party
giving notice may institute the arbitration proceeding. The procedure for the
arbitration will be as follows: 1. [***] will be chosen in accordance with the
arbitration selection rules of JAMS. The selection process will take a maximum
of [***]. 2. The arbitration will take place under JAMS rules to the extent the
rules are not superceded by the agreements of the party to arbitrate or any
agreed limitation on damages. 3. The letter of allegation and a response shall
be filed with [***] arbitrator within [***] of the selection and agreement of
[***] arbitrator to participate. 4. The Parties agree that [***] in connection
with any arbitration that may take place pursuant to this Section 11.7 and,
therefore, the Parties and [***] arbitrator shall use their [***] efforts to
conclude the arbitration, including the issuance of any award resulting
therefrom, within a maximum of [***] from the time of the filing of the
complaint (or, if applicable, in the time periods otherwise specified in Section
1.2) or letter of allegation with [***] arbitrator. 5. The arbitration shall
take place in the San Francisco Bay Area. 6. [***] Judgment on the award of
[***] arbitrator may be entered in the Superior Court of Santa Clara County in
the State of California. All Parties admit to the jurisdiction of the Superior
Court of Santa Clara County in the State of California for purposes of
enforcement of the award of [***] arbitrator and compelling arbitration in
accordance with this Section 11.7. Except to the extent entry of judgment and
any subsequent enforcement may require disclosure, all matters relating to the
arbitration, including the award, shall be held in confidence by the Parties.
Nothing in this Section 11.7 shall be construed to preclude a Party from seeking
injunctive relief in a court of law for a breach of Section 10 where absent such
relief such Party would suffer irreparable harm.

               11.8 This Agreement and the documents referred to herein,
together with the Letter Agreement, dated as of the date hereof, among
Affymetrix, N-Mer, Callida Genomics, Inc. and Hyseq, Inc., are the full
understanding of the Parties with respect to the subject matter hereof and
supersede all prior understandings and writings relating to the subject matter
herein. No waiver alteration or modification of any of the provisions herein
shall be binding unless in writing and signed by the Parties.

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       10

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first above written.

N-MER, INC.

By:    /s/ George B. Rathmann
       --------------------------------------------

Name:  George Rathmann
       --------------------------------------------

Title: Chairman and Interim Chief Executive Officer
       --------------------------------------------

AFFYMETRIX, INC.

By:    /s/ Barbara A. Caulfield
       --------------------------------------------

Name:  Barbara A. Caulfield
       --------------------------------------------

Title: Executive Vice President and General Counsel
       --------------------------------------------

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
     HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
        COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
                              OF 1934, AS AMENDED.

                                       11

                                                                   EXHIBIT 10.24

                                  N-MER, INC.

                                OPTION AGREEMENT

        This Option Agreement (the "Agreement") is entered into as of October
24, 2001, among Callida Genomics, Inc., a Delaware corporation ("CGI"), N-Mer,
Inc., a Delaware corporation ("N-Mer"), and Affymetrix, Inc., a Delaware
corporation ("Affymetrix").

                                    RECITALS

        WHEREAS, CGI, Hyseq, Inc., a Nevada corporation ("Hyseq"), and
Affymetrix have entered into the Preferred Stock Purchase Agreement, dated as of
the date hereof (the "Stock Purchase Agreement");

        WHEREAS, N-Mer and Affymetrix have entered into the Product Development
and Supply Agreement, dated as of the date hereof (the "Supply Agreement"), and
the Product Solicitation Agreement, dated as of the date hereof (the "Product
Solicitation Agreement");

        WHEREAS, this Agreement is being entered into in order to induce
Affymetrix to enter into the Stock Purchase Agreement, Supply Agreement and
Product Solicitation Agreement and to consummate the transactions contemplated
thereby;

        WHEREAS, N-Mer is a wholly-owned subsidiary of CGI; and

        WHEREAS, CGI wishes to grant Affymetrix an option to acquire 81% of the
capital stock of N-Mer.

        NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements set forth herein, the parties hereto hereby agree as
follows:

                                    ARTICLE I

               SECTION 1.1 DEFINITIONS. As used in this Agreement, the following
terms shall have the meanings set forth below:

        "Affiliate" shall mean with respect to any Person (i) any other Person
that directly or indirectly through one or more intermediaries controls or is
controlled by or is under common control with such Person, (ii) or any other
Person owning or controlling 25% or more of the outstanding voting securities of
or other ownership interest in such Person or (iii) any officer, director,
general partner, managing partner or member of such Person.

        "Business Day" shall mean a day other than a Saturday or Sunday on which
commercial banks in New York, New York are not required or permitted under
applicable laws or regulations to close.

        "Capital Lease Obligations" shall mean, with respect to any Person, the
obligation of such Person to pay rent or other amounts under any lease with
respect to any property (whether

real, personal or mixed) acquired or leased by such Person that is required to
be accounted for under generally accepted accounting principles as a liability
on a consolidated balance sheet of such Person.

        "CGI Shares" shall mean (i) all shares of Series A-1 Preferred Stock,
par value $0.001 per share, of CGI purchased on the Effective Date by Affymetrix
pursuant to the Stock Purchase Agreement, (ii) all Additional Shares (as such
term is defined in the Stock Purchase Agreement) purchased by Affymetrix in a
Qualified Financing pursuant to Article VI of the Stock Purchase Agreement,
(iii) any shares of common stock, par value $0.001 per share, of CGI issued upon
conversion of the foregoing and (iv) any securities issued successively in
exchange for or in respect of the foregoing, whether pursuant to a merger or
consolidation, as a result of any successive stock split or reclassification of,
or stock dividend on, any of the foregoing or otherwise.

        "Closing" shall have the meaning set forth in Section 2.3.

        "Closing Date" shall mean the date of the Closing.

        "Common Stock" shall mean the shares of common stock, par value $0.001
per share, of N-Mer.

        "Co-Sale Consideration" shall mean the gross cash and other property
received as consideration by Affymetrix for the CGI Shares transferred by
Affymetrix in exercise of its co-sale rights under Section 2.1 of the CGI
Stockholders Agreement, which consideration shall be prior to the payment of all
fees, expenses, taxes and other charges paid by Affymetrix in respect thereof.

        "Cumulative N-Mer Array Program Investment" shall mean the cumulative
operating expenses incurred and recognized by N-Mer as reflected in the Income
Statement.

        "Effective Date" shall mean the Closing Date (as such term is defined in
the Stock Purchase Agreement).

        "Excess Indebtedness" shall mean (i) the amount of Indebtedness of N-Mer
as of the Closing minus (ii) $1,000,000.

        "Equity Securities" shall mean any securities having voting rights in
the election of the Board of Directors of CGI not contingent upon default, or
any securities evidencing an ownership interest in CGI, or any securities
convertible into or exercisable for any shares of the foregoing, or any
agreement or commitment to issue any of the foregoing, including, without
limitation, Common Stock and Preferred Stock, par value $0.001 per share, of
CGI.

        "Exercise Notice" shall have the meaning set forth in Section 2.2.

        "First Period" shall mean the period commencing on the Effective Date
and ending on the third anniversary of this Agreement.

        "CGI Stockholders Agreement" shall mean the Stockholders Agreement,
dated as of the date hereof, among CGI, Hyseq and Affymetrix.

                                      -2-

        "HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements Act of
1976 or any successor law, and regulations and rules issued pursuant to that Act
or any successor law.

        "Income Statement" means a statement of income prepared in accordance
with generally accepted accounting principles consistently applied for the
period from the date of this Agreement to the date of delivery of the Exercise
Notice.

        "Indebtedness" shall mean, with respect to any Person, (i) all
obligations of such Person for borrowed money or for the deferred purchase price
of property or services (including all obligations, contingent or otherwise, of
such Person in connection with letters of credit, bankers' acceptances, Interest
Rate Protection Agreement or other similar instruments, including currency
swaps) other than indebtedness to trade creditors and service providers incurred
in the ordinary course of business and payable on usual and customary terms,
(ii) all obligations of such Person evidenced by bonds, notes, debentures or
other similar instruments, (iii) all indebtedness created or arising under any
conditional sale or other title retention agreement with respect to property
acquired by such Person (even though the remedies available to the seller or
lender under such agreement are limited to repossession or sale of such
property), (iv) all Capital Lease Obligations of such Person, (v) all
obligations of the types described in clauses (i), (ii), (iii) or (iv) above
secured by (or for which the obligee has an existing right, contingent or
otherwise, to be secured by) any Lien upon or in any property (including
accounts, contract rights and other intangibles) owned by such Person, even
though such Person has not assumed or become liable for the payment of such
Indebtedness, (vi) all preferred stock issued by such Person which is
redeemable, prior to full satisfaction of the Company's obligations under this
Promissory Note, other than at the option of such Person, (vii) all Indebtedness
of others subject to a Third Party Guaranty by such Person and (viii) all
Indebtedness of any partnership of which such Person is a general partner.

        "Interest Rate Protection Agreement" shall mean any interest rate swap
agreement, interest rate cap agreement or similar hedging arrangement used by a
Person to fix or cap a floating rate of interest on Indebtedness to a negotiated
maximum rate or amount.

        "Lien" shall mean a charge, mortgage, pledge, security interest,
restriction, claim, lien, encumbrance or adverse claim of any nature whatsoever
(other than any restrictions on transfer under state and/or federal securities
laws).

        "N-Mer Field" shall mean have the meaning ascribed to such term in the
Product Development and Supply Agreement, dated as of the date hereof, between
N-Mer and Affymetrix.

        "Notice of Disagreement" shall have the meaning set forth in Section
2.2.

        "Option" shall have the meaning set forth in Section 2.1.

        "Option Purchase Price" shall have the meaning set forth in Section 2.1.

        "Option Shares" shall mean 81% of the total number of shares of Common
Stock outstanding on the Closing Date.

                                      -3-

        "Person" shall mean an individual, corporation (including any non-profit
corporation), association, general or limited partnership, organization,
business, firm, limited liability company, joint venture, trust, estate, or
other entity, association or organization, whether constituting a separate legal
entity or not.

        "Qualified Financing" shall have the meaning ascribed to such term in
the Stock Purchase Agreement.

        "Securities Act" shall have the meaning set forth in Section 4.2.

        "Second Period" shall mean the period commencing on the first day
following the end of the First Period and ending on the date that is one year
after the commencement of the Second Period.

        "Term" means the First Period, the Second Period and the Third Period.

        "Third Period" shall mean the period commencing on the first day
following the end of the Second Period and ending at 11:59 p.m., California
time, on the date that is one year after the commencement of the Third Period.

        "Third Party Guaranty" means, with respect to any Person, any
obligation, contingent or otherwise, of such Person guaranteeing or having the
economic effect of guaranteeing any Indebtedness of any other Person (the
"primary obligor") in any manner, whether directly or indirectly, and including
any obligation of such Person, (i) to purchase or pay (or advance or supply
funds for the purchase or payment of) such Indebtedness, (ii) to purchase
property, securities or services for the purpose of assuring the holder of such
Indebtedness of the payment of such Indebtedness of (iii) to maintain working
capital, equity capital or the financial condition or liquidity of the primary
obligor so as to enable the primary obligor to pay such Indebtedness.

        "Work Plan" shall have the meaning ascribed to such term in the Supply
Agreement.

                                   ARTICLE II

                                 TERMS OF OPTION

               SECTION 2.1 GRANT OF OPTION. (a) CGI hereby grants Affymetrix an
option to purchase the Option Shares at the purchase price set forth below and
subject to the other terms and conditions set forth herein (the "Option").

               (b) The purchase price for the Option Shares ("Option Purchase
Price") shall consist of securities and cash as follows:

                      (i) (A) If Affymetrix has not transferred any CGI Shares
        in exercise of its co-sale rights under Section 2.1 of the CGI
        Stockholders Agreement, all CGI Shares; or

                                      -4-

                          (B) If Affymetrix has transferred any of the CGI
        Shares in exercise of its co-sale rights under Section 2.1 of the CGI
        Stockholders Agreement, (1) the Co-Sale Consideration and (2) any CGI
        Shares not transferred by Affymetrix in exercise of such co-sale rights;
        and

                     (ii) (A) If the Option is exercised during the First
        Period, an amount of cash equal to (1) $32 million minus (2) the Excess
        Indebtedness;

                          (B) If the Option is exercised during the Second
        Period, an amount of cash equal to (1) the lesser of (x) the product of
        $32 million multiplied by a fraction, the numerator of which is the
        Cumulative N-Mer Array Program Investment and the denominator of which
        is $20 million or (y) $48 million minus (2) the Excess Indebtedness; or

                          (C) If the Option is exercised during the Third
        Period, an amount of cash equal to (1) the lesser of (x) the product of
        $36.8 million multiplied by a fraction, the numerator of which is the
        Cumulative N-Mer Array Program Investment and the denominator of which
        is $20 million or (y) $48 million minus (2) the Excess Indebtedness.

               SECTION 2.2 EXERCISE OF OPTION. (a) The Option shall be
exercisable, for all but not less than all of the Option Shares, at any time
during the Term. Affymetrix may exercise the Option by delivering a written
notice to CGI in substantially the form attached hereto as Annex A (the
"Exercise Notice"). Delivery of the Exercise Notice shall constitute an
irrevocable and binding commitment by Affymetrix to purchase from CGI, and a
binding obligation of CGI to sell to Affymetrix, the Option Shares.

               (b) CGI shall use commercially reasonable efforts to deliver the
Income Statement to Affymetrix within ten (10) Business Days after receipt by
CGI of the Exercise Notice. If Affymetrix elects to dispute any part of the
Income Statement prior to the Closing, Affymetrix shall, not later than 5 p.m.
California time on the fifth (5th) Business Day following delivery by CGI of the
Income Statement to Affymetrix, deliver written notice to CGI of its intention
to dispute the Income Statement ("Notice of Disagreement"). Promptly following
receipt by CGI of a Notice of Disagreement, the Chief Financial Officers of CGI
and Affymetrix shall meet together and attempt to resolve in good faith any
dispute set forth therein. CGI and Affymetrix agree that the Income Statement
shall be considered purely for the purposes of calculating the Option Purchase
Price and for no other purpose.

               SECTION 2.3 CLOSING. Subject to obtaining any required regulatory
approvals and the expiration or termination of any waiting period applicable to
the sale of the Option Shares under the HSR Act, the closing (the "Closing") of
the purchase and sale of the Option Shares shall take place as soon as
practicable after the earlier of (i) if a Notice of Disagreement is delivered,
resolution of any dispute in respect of the Income Statement and (ii) if a
Notice of Disagreement is not delivered, the lapse of the five (5) Business Day
period provided for the delivery of a Notice of Disagreement, or such other date
as Affymetrix and CGI shall mutually agree. The Closing shall be held at 10:00
a.m., local time, at the principal office of N-Mer. At such Closing, (i) CGI
shall deliver to Affymetrix certificates or other documents evidencing the

                                      -5-

Option Shares being sold, free and clear of any Liens (and CGI hereby represents
and warrants to Affymetrix that such Option Shares shall, immediately prior to
such sale, be so free and clear of Liens and that it shall have good and
marketable title to such Option Shares), (ii) Affymetrix shall deliver to CGI
the cash consideration to be paid for the Option Shares in accordance with
Section 2.1 in cash by wire transfer in immediately available funds to an
account specified by CGI to Affymetrix not less than five (5) days prior to such
Closing and all Co-Sale Consideration deliverable pursuant to Section
2.1(b)(i)(B), (iii) Affymetrix shall deliver to CGI certificates or other
documents evidencing the CGI Shares to be delivered by Affymetrix pursuant to
Section 2.1(b) free and clear of any Liens (and Affymetrix hereby represents and
warrants to CGI that such CGI Shares shall, immediately prior to such delivery,
be so free and clear of Liens), (iv) N-Mer shall duly record the transfer on its
books and records, (v) N-Mer, CGI and Affymetrix shall enter into a
Stockholders' Agreement in substantially the form attached hereto as Annex B and
a Registration Rights Agreement in substantially the form attached hereto as
Annex C and (vi) N-Mer, CGI and Affymetrix shall execute such other documents
and take such other action as shall be reasonably necessary to consummate the
purchase and sale of the Option Shares on the terms contemplated by this Article
II.

        SECTION 2.4 AMENDMENT OF LICENSE AGREEMENT. If the Option is exercised
during the Second Period or the Third Period and a Qualified Financing has not
occurred prior to the Closing, then the License Agreement, dated as of the date
hereof, between CGI and N-Mer shall be deemed amended as of the Closing such
that Section 3.5 of such agreement is deleted in its entirety.

                                   ARTICLE III

                           COVENANTS OF CGI AND N-MER

        SECTION 3.1 RESTRICTIONS ON TRANSFER AND ISSUANCE OF COMMON STOCK.

        CGI shall not, directly or indirectly, sell, assign, transfer or
otherwise dispose of, or pledge, hypothecate or otherwise encumber, any of the
shares of Common Stock. N-Mer shall not issue equity securities (including,
without limitation, Common Stock) or securities convertible into equity
securities to any Person; provided, however, that N-Mer may issue Common Stock
to CGI.

        SECTION 3.2 BASIC FINANCIAL INFORMATION AND REPORTING.

                    (a) N-Mer will maintain true books and records of account in
        which full and correct entries will be made of all its business
        transactions pursuant to a system of accounting established and
        administered in accordance with generally accepted accounting principles
        consistently applied.

                    (b) As soon as practicable after the end of each fiscal year
        of N-Mer, and in any event within ninety (90) days thereafter, N-Mer
        will furnish Affymetrix a consolidated balance sheet of N-Mer, as at the
        end of such fiscal year, and a consolidated statement of income and a
        consolidated statement of cash flows of N-Mer, for such year, all
        prepared in accordance with generally accepted accounting principles
        consistently

                                      -6-

        applied and setting forth in each case in comparative form the figures
        for the previous fiscal year, all in reasonable detail. As soon as
        practicable after the end of each fiscal year of N-Mer, and in any event
        within ninety (90) days thereafter, N-Mer will furnish Affymetrix a
        detailed schedule of the all amounts paid to each of Hyseq, CGI and
        Affymetrix during such year. Such financial statements and schedule
        shall be accompanied by a report and opinion thereon by independent
        public accountants selected by N-Mer's Board of Directors.

                      (c) N-Mer will furnish Affymetrix, as soon as practicable
        after the end of the first, second and third quarterly accounting
        periods in each fiscal year of N-Mer, and in any event within forty-five
        (45) days thereafter, a consolidated balance sheet of N-Mer as of the
        end of each such quarterly period, and a consolidated statement of
        income and a consolidated statement of cash flows of N-Mer for such
        period and for the current fiscal year to date, certified by an
        executive officer of N-Mer and prepared in accordance with generally
        accepted accounting principles, with the exception that no notes need be
        attached to such statements and normal, recurring year-end audit
        adjustments may not have been made. N-Mer will also furnish Affymetrix,
        as soon as practicable after the end of the first, second and third
        quarterly accounting periods in each fiscal year of N-Mer, and in any
        event within forty-five (45) days thereafter, a detailed schedule of the
        all amounts paid to each of Hyseq, CGI and Affymetrix during such
        quarterly period, certified by an executive officer of N-Mer.

                      (d) N-Mer will furnish Affymetrix, as soon as practicable
        after the end of each of the first two months in each fiscal quarter,
        and in any event within fifteen (15) days thereafter, a consolidated
        balance sheet of N-Mer as of the end of each such monthly period, and a
        consolidated statement of income and a consolidated statement of cash
        flows of N-Mer for such period and for the current fiscal year to date,
        certified by an executive officer of N-Mer and prepared in accordance
        with generally accepted accounting principles, with the exception that
        no notes need be attached to such statements and normal, recurring
        year-end audit adjustments may not have been made. N-Mer will also
        furnish Affymetrix, as soon as practicable after the end of each month,
        and in any event together with the financial statements furnished under
        Sections 3.2(b), (c) and (d), a detailed schedule of all amounts paid by
        N-Mer to each of Hyseq, CGI and Affymetrix and their respective
        Affiliates during such monthly period together with a detailed
        description of the basis for such payments (including the methodology
        used for allocating costs to N-Mer), certified by an executive officer
        of N-Mer.

               SECTION 3.3 INSPECTION RIGHTS. Affymetrix (including its
officers, employees, counsel, accountants and other representatives) shall have
the right to visit and inspect any of the properties of N-Mer or any of its
subsidiaries, and to discuss the affairs, finances and accounts of N-Mer or any
of its subsidiaries with its officers and employees, and to review such books,
contracts, records and other information as is reasonably requested all at such
reasonable times and as often as may be reasonably requested.

               SECTION 3.4 AFFILIATE TRANSACTIONS. Neither N-Mer nor any of its
subsidiaries shall enter into any contract or transaction with or for the direct
or indirect benefit of, or pay or provide any money or other form of
consideration, directly or indirectly, to or for the benefit of,

                                      -7-

or assume, guarantee or otherwise become liable for any indebtedness or other
obligation of, or sell, lease (as lessor or lessee), transfer, give or otherwise
assign or acquire any properties or assets, tangible or intangible, or services
to or from, CGI or Hyseq or any of their respective Affiliates which is not in
the ordinary course of business on terms at least as favorable to N-Mer or such
subsidiary as an arm's-length arrangement or which is not in accordance with the
Work Plan.

               SECTION 3.5 LIMITATIONS ON LINE OF BUSINESS. N-Mer shall be
primarily engaged in the N-Mer Field and shall pursue its business solely in
accordance with the Work Plan, and shall not engage in any activities that are
not directly related to the N-Mer Field and not in accordance with the Work
Plan.

               SECTION 3.6 LIMITATIONS ON CERTAIN ACTIVITIES. Neither N-Mer nor
any of its subsidiaries shall take any action in respect of, and CGI shall not
cause N-Mer to take any action in respect of, (i) the adoption, amendment,
alteration or repeal of any provision or term of any certificate of
incorporation or bylaws (or similar constituent documents) for N-Mer or any of
its subsidiaries; (ii) any merger or consolidation involving N-Mer (other than
any merger or consolidation of a wholly-owned subsidiary of N-Mer with or into
N-Mer or another wholly-owned subsidiary of N-Mer); (iii) any reorganization,
dissolution, liquidation or other winding-up or termination of N-Mer or any of
its subsidiaries; (iv) the redemption, purchase, repurchase or other acquisition
for value any equity securities of N-Mer or any of its subsidiaries (except for
acquisitions of common stock by N-Mer pursuant to restricted stock, employment
or consulting agreements which permit N-Mer to repurchase such shares upon
termination of services to N-Mer or in exercise of N-Mer's right of first
refusal upon a proposed transfer); (v) the payment or declaration of any
dividend or distribution on any of equity securities of N-Mer (other than a
dividend payable solely in common stock of N-Mer); and (vi) entering into,
assuming or becoming bound by any contract to do any of the foregoing or
otherwise attempting to do any of the foregoing, either directly or indirectly.

               SECTION 3.7 TERMINATION OF COVENANTS. The covenants of CGI and
N-Mer set forth in this Article III shall terminate upon the earlier of (i) the
expiration of the Term and (ii) the Closing.

                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES

               SECTION 4.1 REPRESENTATIONS AND WARRANTIES OF CGI AND N-MER.

               CGI and N-Mer, jointly and severally, hereby represent and
warrant to Affymetrix as follows:

                    (a) ORGANIZATION AND GOOD STANDING. Each of CGI and N-Mer is
        a corporation duly organized, validly existing and in good standing
        under the laws of the State of Delaware. Each of CGI and N-Mer has all
        requisite corporate power and authority to execute and deliver this
        Agreement and to carry out the provisions of this Agreement.

                                      -8-

                    (b) CAPITALIZATION; VOTING RIGHTS. The authorized capital
        stock of N-Mer, as of the date of this Agreement, consist of 1,000
        shares of Common Stock, of which 100 shares (the "Outstanding Shares")
        are issued and outstanding. All of the Outstanding Shares are owned by
        CGI. Except as may be granted pursuant to this Agreement, there are no
        outstanding options, warrants, puts, calls, rights (including conversion
        or preemptive rights and rights of first refusal), proxy or stockholder
        agreements, or agreements of any kind for the purchase or acquisition
        from N-Mer or CGI of any securities of N-Mer. The Outstanding Shares
        have been duly authorized, validly issued (including, without
        limitation, issued in compliance with applicable state and federal
        securities laws), fully paid and nonassessable and are, and shall be
        immediately prior to Closing, free of any Liens.

                    (c) AUTHORIZATION; BINDING OBLIGATIONS. All corporate action
        on the part of each of CGI and N-Mer, its officers, directors and
        stockholders necessary for the authorization, execution and delivery of
        this Agreement, the performance of all obligations of each of CGI and
        N-Mer hereunder and the sale and delivery of the Option Shares pursuant
        hereto has been taken. This Agreement is the valid and legally binding
        obligation of each of CGI and N-Mer enforceable against each of CGI and
        N-Mer in accordance with its terms, except (i) as limited by applicable
        bankruptcy, insolvency, reorganization, moratorium or other laws of
        general application affecting enforcement of creditors' rights; and (ii)
        as limited by general principles of equity that restrict the
        availability of specific performance, injunctive relief or other
        equitable remedies. The sale of the Option Shares will not be subject to
        any preemptive rights or rights of first refusal that have not been
        properly waived or complied with.

                    (d) COMPLIANCE WITH OTHER INSTRUMENTS. Neither CGI nor N-Mer
        is in violation or default and the execution and delivery of this
        Agreement and the performance of their respective obligations hereunder
        will not violate or cause a default under, or otherwise conflict with,
        any term of the Certificate of Incorporation or Bylaws of CGI or N-Mer,
        or of any provision of any mortgage, indenture, agreement, instrument or
        contract to which CGI or N-Mer is a party or by which CGI or N-Mer is
        bound. The execution, delivery and performance of and compliance with
        this Agreement, and the sale of the Option Shares pursuant hereto, will
        not, with or without the passage of time or giving of notice, result in
        any such violation, or be in conflict with or constitute a default under
        any such term or provision, or result in the creation of any Lien upon
        any of the properties or assets of CGI or N-Mer.

                    (e) COMPLIANCE WITH LAWS; PERMITS. Neither CGI nor N-Mer is
        in violation of, and the execution and delivery of this Agreement and
        the performance by each of CGI and N-Mer of its obligations hereunder
        will not violate, any statute, rule, regulation, order or restriction of
        any domestic or foreign government or any instrumentality or agency
        thereof in respect of the conduct of its business or the ownership of
        its properties which violation would materially and adversely affect the
        business, financial condition, results of operations or prospects of
        either CGI or N-Mer. No governmental orders, permissions, consents,
        approvals or authorizations are required to be obtained and no
        registrations or declarations are required to be filed in connection
        with the execution and delivery of this Agreement and the offer, sale
        and delivery of the

                                      -9-

        Option Shares, or the other transactions to be consummated at the
        Closing, as contemplated in this Agreement, except for such orders,
        permissions, consents, approvals or authorizations as may be required
        under applicable federal or state securities laws.

               SECTION 4.2 REPRESENTATIONS AND WARRANTIES OF AFFYMETRIX.

               Affymetrix hereby represents and warrants to CGI and N-Mer as
        follows:

                      (a) AUTHORIZATION; BINDING OBLIGATIONS. Affymetrix has all
        necessary power and authority to execute and deliver this Agreement and
        to carry out its obligations hereunder. All actions on the part of
        Affymetrix required for the due authorization, execution and delivery of
        this Agreement have been taken. This Agreement is the valid and legally
        binding obligation of Affymetrix, enforceable in accordance with its
        terms, except (i) as limited by applicable bankruptcy, insolvency,
        reorganization, moratorium or other laws of general application
        affecting enforcement of creditors' rights; and (ii) as limited by
        general principles of equity that restrict the availability of specific
        performance, injunctive relief or other equitable remedies.

                      (b) PURCHASE ENTIRELY FOR OWN ACCOUNT. Affymetrix is
        acquiring the Option, and will acquire the Option Shares (together with
        the Option, the "Securities"), for its own account, not as a nominee or
        agent, for investment and not with a view to the resale or distribution
        of any part thereof.

                      (c) INVESTMENT EXPERIENCE. Affymetrix is an "accredited
        investor" within the meaning of Rule 501(a) under the Securities Act of
        1933, as amended (the "Securities Act"). Affymetrix has such knowledge
        and experience in financial and business matters that Affymetrix is
        capable of evaluating the merits and risks of the investment
        contemplated hereby and otherwise to protect its own interests in
        connection with the purchase of the Securities.

                      (d) RESTRICTED SECURITIES. Affymetrix understands that the
        Securities are being offered in transactions not involving any public
        offering in the United States within the meaning of the Securities Act,
        that the Securities have not been registered under the Securities Act
        and that Affymetrix may not resell, pledge or otherwise transfer any
        Securities except (A) pursuant to an effective registration statement
        under the Securities Act, (B) in an offshore transaction complying with
        Rule 904 of Regulation S under the Securities Act, or (C) pursuant to
        another applicable exemption from registration.

                      (e) NO PUBLIC MARKET. Affymetrix understands that no
        public market now exists for any of the securities issued by N-Mer and
        that neither N-Mer nor CGI has made any assurances that a public market
        will ever exist for such securities.

                      (f) LEGENDS. Affymetrix understands that the Option
        Shares, and any securities issue in respect thereof or in exchange
        therefor, may bear the following legend until such time, if any, as (A)
        the Option Shares or such securities (i) are sold in compliance with
        Rule 144 under the Securities Act (or a comparable successor provision)
        or pursuant to an effective registration statement under the Securities
        Act or (ii) are

                                      -10-

        eligible for sale pursuant to Rule 144(k) under the Securities Act (or a
        comparable successor provision), or (B) the Company receives an opinion
        of counsel reasonably acceptable to it to the effect that such legend
        may be removed:

               "THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER
               THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE
               "SECURITIES ACT"), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR
               OTHERWISE TRANSFERRED EXCEPT (A) (1) IF REGISTERED UNDER THE
               SECURITIES ACT OR (2) IN A TRANSACTION EXEMPT FROM, OR NOT
               SUBJECT TO, SUCH REGISTRATION (IT BEING UNDERSTOOD THAT NO
               REPRESENTATION CAN BE MADE AS TO THE AVAILABILITY OF AN
               EXEMPTION) AND (B) IN ACCORDANCE WITH ALL APPLICABLE SECURITIES
               LAWS OF THE STATES OF THE UNITED STATES."

               The Shares will also bear any legend required by the laws of the
        State of California, including any legend required by the California
        Department of Corporations and Sections 417 and 418 of the California
        Corporations Code.

                      (g) LIENS. The CGI Shares held by Affymetrix on the
        Closing Date are held by it free and clear of any Liens.

                                    ARTICLE V

                                  MISCELLANEOUS

               SECTION 5.1 GOVERNING LAW. This Agreement shall be governed in
all respects by the laws of the State of California without regard to the
conflicts of laws principles thereof.

               SECTION 5.2 SURVIVAL; INDEMNIFICATION. The representations,
warranties, covenants and agreements contained in this Agreement shall survive
the execution and delivery of this Agreement and the Closing. Each party agrees
to indemnify each other party against any and all claims, demands, losses,
damages, liabilities, lawsuits, and other proceedings, judgments and awards, and
costs and expenses (including reasonable attorneys' fees and expenses) incurred
by such other party or any Affiliate of such other party arising from any breach
by such party of any of its representations, warranties, covenants or agreements
in this Agreement.

               SECTION 5.3 SUCCESSORS AND ASSIGNS. This Agreement shall inure to
the benefit of, and be binding upon, the parties and their successors and
permitted assigns. Except as otherwise expressly provided herein, the rights and
obligations hereunder may not be assigned or delegated by any party hereto
without the prior written consent of each other party; provided, however, that
Affymetrix may assign this Agreement to any of its Affiliates or to any Person
(or any of such Person's Affiliates) that consolidates or merges with or into,
or otherwise acquires, Affymetrix or the business of Affymetrix to which this
Agreement relates or purchases, leases or otherwise acquires all or
substantially all of the assets of Affymetrix or the assets of that part of the
business of Affymetrix to which this Agreement relates. Any assignment or
delegation contrary to the provisions hereof shall be null and void.

                                      -11-

               SECTION 5.4 ENTIRE AGREEMENT. This Agreement, together with the
Letter Agreement, dated as of the date hereof, among CGI, Affymetrix, N-Mer and
Hyseq, constitutes the full and entire understanding and agreement between the
parties with regard to the subject matter hereof.

               SECTION 5.5 SEVERABILITY. In case any provision of the Agreement
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

               SECTION 5.6 AMENDMENT AND WAIVER. This Agreement may be amended
or modified, and any term or provision of this Agreement may be waived, only
upon the written consent of the parties hereto.

               SECTION 5.7 DELAYS OR OMISSIONS. It is agreed that no delay or
omission to exercise any right, power or remedy accruing to a party, upon any
breach, default or noncompliance by the party under this Agreement, shall impair
any such right, power or remedy, nor shall it be construed to be a waiver of any
such breach, default or noncompliance thereafter occurring. It is further agreed
that any waiver, permit, consent or approval of any kind or character on either
party's part of any breach, default or noncompliance under this Agreement or any
waiver on such party's part of any provisions or conditions of this Agreement
must be in writing and shall be effective only to the extent specifically set
forth in such writing. All remedies, either under this Agreement, by law, or
otherwise afforded to any party, shall be cumulative and not alternative.

               SECTION 5.8 NOTICES. All notices, consents or other
communications shall be in writing, and shall be deemed to have been duly given
and delivered when delivered by hand, or when mailed by registered or certified
mail, return receipt requested, postage prepaid, or when received via telecopy,
telex or other electronic transmission, in all cases addressed to the party for
whom intended at its address set forth below:

              If to CGI:

                         Callida Genomics, Inc.
                         670 Almanor Avenue
                         Sunnyvale, California 94085

                         Telephone:   (408) 524-8100
                         Facsimile:   (408) 524-8141
                         Attention:   Dr. Radoje Drmanac

              If to N-Mer:

                         N-Mer, Inc.
                         670 Almanor Avenue
                         Sunnyvale, California 94085

                         Telephone:   (408) 524-8100

                                      -12-

                         Facsimile:   (408) 524-8141
                         Attention:   Dr. Radoje Drmanac

              with a copy to (which shall not constitute notice):

                         Latham & Watkins
                         135 Commonwealth Drive
                         Menlo Park, California  94025

                         Telephone:   (650) 328-4600
                         Facsimile:   (650) 463-2600
                         Attention:   Alan C. Mendelson, Esq.

              If to Affymetrix:

                         Affymetrix, Inc.
                         3380 Central Expressway
                         Santa Clara, California  95051

                         Telephone:   (408) 731-5000
                         Facsimile:   (408) 731-5394
                         Attention:   General Counsel

              with a copy to (which shall not constitute notice):

                         Sullivan & Cromwell
                         1870 Embarcadero Road
                         Palo Alto, California  94303

                         Telephone:   (650) 461-5600
                         Facsimile:   (650) 461-5700
                         Attention:   John L. Savva, Esq.

or such other address as a party shall have designated by notice in writing to
the other party given in the manner provided by this Section.

               SECTION 5.9 TITLES AND SUBTITLES. The titles of the sections and
subsections of the Agreement are for convenience of reference only and are not
to be considered in construing this Agreement.

               SECTION 5.10 COUNTERPARTS. This Agreement may be executed in any
number of counterparts, each of which shall be an original, but all of which
together shall constitute one instrument.

               SECTION 5.11 BROKER'S FEES. Each party hereto represents and
warrants that no agent, broker, investment banker, person or firm acting on
behalf of or under the authority of

                                      -13-

such party hereto is or will be entitled to any broker's or finder's fee or any
other commission directly or indirectly in connection with the transactions
contemplated herein.

               SECTION 5.12 EXPENSES. Each party shall pay all costs and
expenses that it incurs with respect to the negotiation, execution, delivery and
performance of this Agreement and all of the transactions contemplated herein.

               SECTION 5.13 ATTORNEY'S FEES. If any action at law or in equity
is necessary to enforce or interpret the terms of this Agreement, the prevailing
party shall be entitled to reasonable attorneys' fees, costs and necessary
disbursements in addition to any other relief to which such party may be
entitled.

               SECTION 5.14 FURTHER ASSURANCES. Each party shall use its
respective reasonable efforts at any time and from time to time to execute and
deliver to the applicable party such further documents and instruments and to
take all such further actions as such other party to this Agreement reasonably
may request to consummate the transactions contemplated by this Agreement.

               SECTION 5.15 REQUIRED APPROVALS As promptly as practicable after
the delivery of the Exercise Notice, CGI shall, and shall cause N-Mer to, make
all filings required to be made by them in order to consummate the sale of the
Option Shares to Affymetrix (including all filings under the HSR Act). Between
the date of the delivery of the Exercise Notice and the Closing Date, CGI shall,
and shall cause N-Mer to, cooperate with Affymetrix with respect to all filings
that Affymetrix reasonably elects to make or is required to make in connection
with the sale of the Option Shares to Affymetrix (including taking all actions
reasonably requested by Affymetrix to cause early termination of any applicable
waiting period under the HSR Act).

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                      -14-

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date set forth in the first paragraph hereof.

                                            CALLIDA GENOMICS, INC.

                                            By: /s/ George B. Rathmann
                                                --------------------------------
                                                Name:  George B. Rathmann
                                                Title: Chairman and Interim
                                                       Chief Executive Officer

                                            N-MER, INC.

                                            By: /s/ George B. Rathmann
                                                --------------------------------
                                                Name:  George B. Rathmann
                                                Title: Chairman and Interim
                                                       Chief Executive Officer

                                            AFFYMETRIX, INC.

                                            By: /s/ Barbara A. Caulfield
                                                --------------------------------
                                                Name:  Barbara A. Caulfield
                                                Title: Executive Vice President
                                                       and General Counsel

                             (Signature page to Option Agreement)

                               NOTICE OF EXERCISE

        The undersigned ______________________, a__ , pursuant to the provisions
of that certain Option Agreement, entered into as of October __, 2001 (the
"Agreement"), among Callida Genomics, Inc., a Delaware corporation ("CGI"),
N-Mer, Inc., a Delaware corporation ("N-Mer"), and Affymetrix, Inc., a Delaware
corporation ("Affymetrix"), hereby agrees to purchase [81] shares of Common
Stock, par value $0.001 per share, of N-Mer.

        The undersigned further acknowledges that it has reviewed the
representations and warranties contained in Section 4.2 of the Agreement and by
its signature below hereby makes such representations and warranties to CGI and
agrees to be bound by all the terms and conditions contained in the Agreement.

Dated: __________________                   [AFFYMETRIX, INC.]

                                            __________________________________
                                            Name:
                                            Title:

                        AMENDMENT TO THE OPTION AGREEMENT

        This Amendment to the Option Agreement (this "Amendment") is entered
into as of November 13, 2001, among Callida Genomics, Inc., a Delaware
corporation ("CGI"), N-Mer, Inc., a Delaware corporation ("N-Mer"), and
Affymetrix, Inc., a Delaware corporation ("Affymetrix").

        WHEREAS, CGI, N-Mer and Affymetrix entered into the Option Agreement
(the "Agreement") on October 24, 2001; and

        WHEREAS, the parties hereto desire to correct a mistake in Section
4.1(b) of the Agreement relating to the capitalization of N-Mer.

        NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements set forth herein, the parties hereto hereby agree as
follows:

        1. AMENDMENT TO SECTION 4.1(b) OF THE AGREEMENT. Section 4.1(b) of the
Agreement is hereby amended to replace the number "1,000" appearing in the first
sentence of such section with the number "100".

        2. NO OTHER AMENDMENTS; EFFECT OF AMENDMENT. Except as expressly amended
by Section 1 of this Amendment, the Agreement shall remain in full force and
effect in the form in which it existed immediately prior to the execution and
delivery of this Amendment. This Amendment shall be deemed effective, and
Section 4.1(b) shall be deemed amended, for all purposes, as of the time of
first signing of the Agreement.

        3. GOVERNING LAW. This Amendment shall be governed in all respects by
the laws of the State of California without regard to the conflicts of laws
principles thereof.

        4. ENTIRE AGREEMENT. This Amendment, together with the Agreement and the
Letter Agreement, dated as of October 24, 2001, among CGI, Affymetrix, N-Mer and
Hyseq, constitutes the full and entire understanding and agreement between the
parties with regard to the subject matter hereof.

        5. COUNTERPARTS. This Amendment may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

        6. EXPENSES. Each party shall pay all costs and expenses that it incurs
with respect to the negotiation, execution, delivery and performance of this
Amendment and all of the transactions contemplated herein.

        7. DEFINITIONS. Capitalized terms used but not defined herein shall have
the meaning ascribed to them in the Agreement.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

        IN WITNESS WHEREOF, the parties hereto have executed this Amendment to
the Option Agreement as of the date set forth in the first paragraph hereof.

                                            CALLIDA GENOMICS, INC.

                                            By:________________________________
                                               Name:
                                               Title:

                                            N-MER, INC.

                                            By:________________________________
                                               Name:
                                               Title:

                                            AFFYMETRIX, INC.

                                            By:________________________________
                                               Name:
                                               Title:

              (Signature page to Amendment to the Option Agreement)

                                                                   EXHIBIT 10.25

                                   HYSEQ INC.

                             STOCK OPTION AGREEMENT

- -----------------------------------------------------------------------------------------
                                          Number of                     Social Security
      Granted To          Grant Date       Shares     Price Per Share       Number
- -----------------------------------------------------------------------------------------
                                                            
George B. Rathmann     February 1, 2000  1,000,000         $31.688
- -----------------------------------------------------------------------------------------

        1. You are hereby granted, in connection with and in partial
consideration of your initial employment by Hyseq, Inc. (the "COMPANY") as its
Chairman of the Board, an option (the "OPTION") to purchase, at the above stated
price, upon and subject to the provisions and conditions hereinafter set forth,
1,000,000 shares of common stock, $.001 par value per share ("COMMON STOCK"), of
the Company, which Option shall become exercisable for the number of shares and
on the dates as shown below. This Option is a non-statutory stock option, which
is not granted under any stock option plan sponsored by the Company, and is
neither designated as, nor intended to be, an incentive stock option.

               Number of Shares                Accrual Date
               ----------------                ------------
                                          
                    333,333                  February 1, 2000
                    333,333                  February 1, 2001
                    333,334                  February 1, 2002

Unless earlier terminated pursuant to the terms of this Agreement, the Option
shall expire on January 31, 2010.

================================================================================

I hereby acknowledge receipt of this Option and understand that it is governed
by the terms of this contract. I acknowledge that I am aware of the provisions
contained in this contract whereby the Board of Directors of the Company (the
"BOARD OF DIRECTORS") may terminate or amend this contract. I further
acknowledge that the grant hereby made to me does not, under any circumstances,
create any right for me to receive any grant in the future.

/s/ GEORGE B. RATHMANN                            Date  2/1/2000
- ----------------------------------------              --------------------------
George B. Rathmann

        2. To exercise your Option to purchase any shares hereunder, it shall be
necessary for you, on or after the date on which such purchase privilege accrues
and prior to the above-stated expiration date, to make payment in full to the
Company, in cash or in Common Stock of the Company or in a combination thereof,
for the shares which you so elect to purchase, at the price per share herein
described, whereupon you will receive the shares for which you thus make
payment; provided, however, if all or part of the payment is in shares of Common
Stock of the Company, that if such shares were acquired pursuant to an incentive
stock option plan (as defined in Section 422 of the Internal Revenue Code of
1986, as amended (the "CODE")) of the Company, then the applicable holding
period requirements of Section 422 of the Code have been met with respect to
such shares, and, provided further, that if you are subject to the reporting
requirements of Section 16 of the Securities Exchange Act of 1934, as amended
from time to time, then, if (i) such shares were granted pursuant to an option,
then such option must have been granted at least six (6) months prior to the
exercise of the Option hereunder, and (ii) such shares were purchased other than
through the grant and exercise of an option, such shares were owned by you for
more than six (6) months prior to the exercise of the Option hereunder. If all
or part of the payment is in shares of Common Stock of the Company, such shares
shall be valued at their fair market value on the date of exercise.

        3. The Board of Directors reserves and shall have the right, by written
notice to you, to amend or terminate the provisions of this contract in any
manner that it may deem necessary or advisable to carry out the purpose of this
grant as the result of, or to comply with, any change in applicable regulations,
interpretation or statutory enactment, provided that any such change shall be
applicable only to the shares for which payment shall not then have been made as
herein provided.

        4. Upon the termination of your employment with the Company for any
reason or no reason, the unvested portion of the Option shall be forfeited.
Except as set forth in Paragraph 5, the vested unexercised portion of the Option
shall be exercisable by you for a period of thirty (30) days following such a
termination of your employment, or, if earlier, until the expiration of the
originally prescribed term of the Option. Upon the expiration of such thirty
(30) day period (or, if earlier, the originally prescribed term of the Option),
the unexercised Option shall expire and be forfeited.

        5. Upon the termination of your employment with the Company as the
result of your death or disability while an employee, the outstanding vested
portion of the Option will be exercisable by you (or your legal representative
or designated beneficiary) for one (1) year following your death or disability,
or, if earlier, until the expiration of the originally prescribed term of the
Option. Upon the expiration of such one (1) year period (or, if earlier, the
originally prescribed term of the Option), the unexercised Option shall expire
and be forfeited. For purposes of this Agreement, disability shall mean
permanent and total disability as defined in Section 22(e)(3) of the Code.

                                       2

        6.     (a) If the outstanding shares of Common Stock are increased,
decreased or changed into, or exchanged for, a different number or kind of
shares or securities of the Company through a reorganization or merger in which
the Company is the surviving entity, or through a combination, recapitalization,
reclassification, stock split, stock dividend, stock consolidation or otherwise,
an appropriate adjustment shall be made in the number and kind of shares that
may be issued pursuant to the Option. The corresponding adjustment to the
consideration payable with respect to the Option shall also be made. Any such
adjustment, however, shall be made without change to the total payment, if any,
applicable to the portion of the Option not exercised with a corresponding
adjustment in the price for each share.

               (b) In the event of a "change of control" of the Company, the
Option, whether or not exercisable pursuant to the schedule set forth in
Paragraph 1 at the time of the change of control, shall become immediately
exercisable. A change of control shall be deemed to occur on the earliest of (i)
the acquisition by any entity, person, or group of beneficial ownership, as that
term is defined in Rule 13d-3 under the Securities Exchange Act of 1934, of more
than 50% of the outstanding capital stock of the Company entitled to vote for
the election of directors ("VOTING STOCK"); (ii) the commencement by any entity,
person, or group (other than the Company or a subsidiary of the Company) of a
tender offer or an exchange offer for more than 50% of the outstanding Voting
Stock of The Company; (iii) the effective time of (A) a merger or consolidation
of the Company with one or more corporations as a result of which the holders of
the outstanding Voting Stock of the Company immediately prior to such merger
hold less than 50% of the Voting Stock of the surviving or resulting
corporation, or (B) a transfer of substantially all of the property or assets of
the Company other than to an entity of which the Company owns at least 80% of
the Voting Stock; or (iv) the election to the Board, without the recommendation
or approval of the incumbent Board of the lesser of (A) three directors, or (B)
directors constituting a majority of the number of directors of the Company then
in office.

        7. The Option herein granted shall be exercisable during your lifetime
only by you or your legal representative, and in the event of your death then
thereafter only by your beneficiary, and in any event only in accordance with
and subject to the provisions and conditions herein set forth. You may name,
from time to time, any beneficiary or beneficiaries (who may be named
contingently or successively). Each designation will revoke all prior
designations and will be effective only when filed in writing with the Company
during your lifetime. In the absence of any such designation, your estate shall
be deemed to be your beneficiary.

        8. This contract and the purchase privilege or Option herein granted
shall not otherwise by transferable by you, expressly or by operation of law,
and any attempted transfer or other disposition thereof by you shall be void and
shall nullify this Option and result in the cancellation of this contract by the
Company.

        9. If the exercise of this Option requires withholding of tax under any
law, including, without limitation, under any federal, state or local law, the
Company may require you to pay to it or may withhold from your compensation, at
its discretion, the amount of such withholding prior to issuing any Common Stock
or retain such amount from any payment otherwise due to you.

                                       3

        10. Neither this Option nor any shares to be acquired pursuant to the
exercise of any rights relating to this Option have been or will be registered
under any securities laws other than the federal securities laws of the United
States and the Company has no obligation to register this Option or any such
shares. Any shares acquired pursuant to rights relating to this Option may not
be sold, transferred or otherwise traded in the absence of registration under or
an exemption from any applicable requirements of any securities laws applicable
to you, and each certificate representing such shares shall bear an appropriate
legend to such effect, if applicable.

        11. Nothing in this contract shall interfere with or limit in any way
the right of the Company to terminate employment at any time, nor confer upon
you any right to continue in the employ of the Company for any period of time or
to continue your present or any other rate of compensation.

        12. The issuance of shares of Common Stock shall be subject to all
applicable laws, rules and regulations, and to such approvals by any
governmental agencies or national securities exchanges as may be required. It is
the intent of the parties that: (i) the terms of this contract shall be governed
by, and construed in accordance with, the laws of the State of Nevada, and (ii)
the terms of the contract shall be subject to the jurisdiction of the courts of
the State of Nevada

        13. Please acknowledge receipt of this Option at the bottom of the
duplicate copy of the first page herewith enclosed and return the same within
thirty (30) days from the date you receive this Option Agreement to the office
of Hyseq, Inc., Attention: Lewis S. Gruber, 670 Almanor Avenue, Sunnyvale,
California 94086.

HYSEQ, INC.

By:  /s/ LEWIS S. GRUBER
     --------------------------------------
     Lewis S. Gruber
Its: President and Chief Executive Officer

                                       4

                                                                   EXHIBIT 10.26

                                   HYSEQ INC.

                             STOCK OPTION AGREEMENT

- ------------------------------------------------------------------------------------------
                                           Number of                     Social Security
      Granted To           Grant Date       Shares     Price Per Share       Number
- ------------------------------------------------------------------------------------------
                                                            
George B. Rathmann       August 21, 2001  1,000,000        $8.635
- ------------------------------------------------------------------------------------------

        1. You are hereby granted, in connection with and in partial
consideration of your continued employment by Hyseq, Inc. (the "Company") as its
Chairman of the Board, an option (the "Option") to purchase, at the above stated
price, upon and subject to the provisions and conditions hereinafter set forth,
1,000,000 shares of common stock, $.001 par value per share ("Common Stock"), of
the Company, which Option shall become exercisable for the number of shares as
shown below on the later of (i) the accrual date set forth below and (ii) such
date whereon the stockholders of the Company approve the grant of this Option.
This Option is a non-statutory stock option, which is not granted under any
stock option plan sponsored by the Company, and is neither designated as, nor
intended to be, an incentive stock option.

                 Number of Shares                Accrual Date
                 ----------------                ------------
                                        
             1/4th of total number of      one year after grant date
                      shares
             1/48th of total number of     each monthly anniversary
                      shares                  after the one year
                                           anniversary of the grant
                                                 date

Unless earlier terminated pursuant to the terms of this Agreement, the Option
shall expire on ten years minus one day after the date of grant.

I hereby acknowledge receipt of this Option and understand that it is governed
by the terms of this contract. I acknowledge that I am aware of the provisions
contained in this contract whereby the Board of Directors of the Company (the
"Board of Directors") may terminate or amend this contract. I further
acknowledge that the grant hereby made to me does not, under any circumstances,
create any right for me to receive any grant in the future.

/s/ GEORGE B. RATHMANN                            Date  8/21/2001
- ----------------------------------------              --------------------------
George B. Rathmann

        2. To exercise your Option to purchase any shares hereunder, it shall be
necessary for you, on or after the date on which such purchase privilege accrues
and prior to the above-stated expiration date, to make payment in full to the
Company, in cash or in Common Stock of the Company or in a combination thereof,
for the shares which you so elect to purchase, at the price per share herein
described, whereupon you will receive the shares for which you thus make
payment; provided, however, if all or part of the payment is in shares of Common
Stock of the Company, that if such shares were acquired pursuant to an incentive
stock option plan (as defined in Section 422 of the Internal Revenue Code of
1986, as amended (the "Code")) of the Company, then the applicable holding
period requirements of Section 422 of the Code have been met with respect to
such shares, and, provided further, that if you are subject to the reporting
requirements of Section 16 of the Securities Exchange Act of 1934, as amended
from time to time, then, if (i) such shares were granted pursuant to an option,
then such option must have been granted at least six (6) months prior to the
exercise of the Option hereunder, and (ii) such shares were purchased other than
through the grant and exercise of an option, such shares were owned by you for
more than six (6) months prior to the exercise of the Option hereunder. If all
or part of the payment is in shares of Common Stock of the Company, such shares
shall be valued at their fair market value on the date of exercise.

        3. The Board of Directors reserves and shall have the right, by written
notice to you, to amend or terminate the provisions of this contract in any
manner that it may deem necessary or advisable to carry out the purpose of this
grant as the result of, or to comply with, any change in applicable regulations,
interpretation or statutory enactment, provided that any such change shall be
applicable only to the shares for which payment shall not then have been made as
herein provided.

        4. Upon the termination of your employment with the Company for any
reason or no reason, the unvested portion of the Option shall be forfeited.
Except as set forth in Paragraph 5, the vested unexercised portion of the Option
shall be exercisable by you for a period of thirty (30) days following such a
termination of your employment, or, if earlier, until the expiration of the
originally prescribed term of the Option. Upon the expiration of such thirty
(30) day period (or, if earlier, the originally prescribed term of the Option),
the unexercised Option shall expire and be forfeited.

        5. Upon the termination of your employment with the Company as the
result of your death or disability while an employee, the outstanding vested
portion of the Option will be exercisable by you (or your legal representative
or designated beneficiary) for one (1) year following your death or disability,
or, if earlier, until the expiration of the originally prescribed term of the
Option. Upon the expiration of such one (1) year period (or, if earlier, the
originally prescribed term of the Option), the unexercised Option shall expire
and be forfeited. For purposes of this Agreement, disability shall mean
permanent and total disability as defined in Section 22(e)(3) of the Code.

        6.(a) If the outstanding shares of Common Stock are increased, decreased
or changed into, or exchanged for, a different number or kind of shares or
securities of the Company through a reorganization or merger in which the
Company is the surviving entity, or through a combination, recapitalization,
reclassification, stock split, stock

dividend, stock consolidation or otherwise, an appropriate adjustment shall be
made in the number and kind of shares that may be issued pursuant to the Option.
The corresponding adjustment to the consideration payable with respect to the
Option shall also be made. Any such adjustment, however, shall be made without
change to the total payment, if any, applicable to the portion of the Option not
exercised with a corresponding adjustment in the price for each share.

               (b) In the event of a "change of control" of the Company, the
Option, whether or not exercisable pursuant to the schedule set forth in
Paragraph 1 at the time of the change of control, shall become immediately
exercisable. A change of control shall be deemed to occur on the earliest of (i)
the acquisition by any entity, person, or group of beneficial ownership, as that
term is defined in Rule 13d-3 under the Securities Exchange Act of 1934, of more
than 50% of the outstanding capital stock of the Company entitled to vote for
the election of directors ("Voting Stock"); (ii) the commencement by any entity,
person, or group (other than the Company or a subsidiary of the Company) of a
tender offer or an exchange offer for more than 50% of the outstanding Voting
Stock of The Company; (iii) the effective time of (A) a merger or consolidation
of the Company with one or more corporations as a result of which the holders of
the outstanding Voting Stock of the Company immediately prior to such merger
hold less than 50% of the Voting Stock of the surviving or resulting
corporation, or (B) a transfer of substantially all of the property or assets of
the Company other than to an entity of which the Company owns at least 80% of
the Voting Stock; or (iv) the election to the Board, without the recommendation
or approval of the incumbent Board of the lesser of (A) three directors, or (B)
directors constituting a majority of the number of directors of the Company then
in office.

        7. The Option herein granted shall be exercisable during your lifetime
only by you or your legal representative, and in the event of your death then
thereafter only by your beneficiary, and in any event only in accordance with
and subject to the provisions and conditions herein set forth. You may name,
from time to time, any beneficiary or beneficiaries (who may be named
contingently or successively). Each designation will revoke all prior
designations and will be effective only when filed in writing with the Company
during your lifetime. In the absence of any such designation, your estate shall
be deemed to be your beneficiary.

        8. This contract and the purchase privilege or Option herein granted
shall not otherwise by transferable by you, expressly or by operation of law,
and any attempted transfer or other disposition thereof by you shall be void and
shall nullify this Option and result in the cancellation of this contract by the
Company.

        9. If the exercise of this Option requires withholding of tax under any
law, including, without limitation, under any federal, state or local law, the
Company may require you to pay to it or may withhold from your compensation, at
its discretion, the amount of such withholding prior to issuing any Common Stock
or retain such amount from any payment otherwise due to you.

        10. Neither this Option nor any shares to be acquired pursuant to the
exercise of any rights relating to this Option have been or will be registered
under any securities laws other than the federal securities laws of the United
States and the Company has no obligation to register this Option or any such
shares. Any shares acquired pursuant to rights relating to this Option may not
be sold, transferred or otherwise traded in the absence of registration under or
an exemption from any applicable requirements of any securities laws applicable
to you, and each certificate representing such shares shall bear an appropriate
legend to such effect, if applicable.

        11. Nothing in this contract shall interfere with or limit in any way
the right of the Company to terminate employment at any time, nor confer upon
you any right to continue in the employ of the Company for any period of time or
to continue your present or any other rate of compensation.

        12. The issuance of shares of Common Stock shall be subject to all
applicable laws, rules and regulations, and to such approvals by any
governmental agencies or national securities exchanges as may be required. It is
the intent of the parties that: (i) the terms of this contract shall be governed
by, and construed in accordance with, the laws of the State of Nevada, and (ii)
the terms of the contract shall be subject to the jurisdiction of the courts of
the State of Nevada.

        13. Please acknowledge receipt of this Option at the bottom of the
duplicate copy of the first page herewith enclosed and return the same within
thirty (30) days from the date you receive this Option Agreement to the office
of Hyseq, Inc., Attention: Ted W. Love, 670 Almanor Avenue, Sunnyvale,
California 94085.

HYSEQ, INC.

By:  /s/ Ted W. Love
     -------------------------------------
     Ted W. Love
     President and Chief Executive Officer

                                                                  Exhibit 21.1

Subsidiaries of Hyseq, Inc. as of December 31, 2001:

1. Hyseq Diagnostics, Inc., a Nevada corporation

2. Callida Genomics, Inc., a Delaware corporation

3. N-Mer, Inc., a Delaware corporation

                                                                   EXHIBIT 23.1

                   Consent of KPMG LLP, Independent Auditors

     We consent to the incorporation by reference in the registration statement
on Form S-3 (No. 333-70134) and  the registration statements on Form S-8 (Nos.
333-68172 and 333-68170) of Hyseq, Inc. of our report dated February 5, 2002,
relating to the consolidated balance sheets of Hyseq, Inc. as of December 31,
2001 and 2000 and the related consolidated statements of operations,
stockholders' equity and cash flows for the years then ended, which report
appears in the December 31, 2001, annual report on Form 10-K of Hyseq, Inc.

                                               /s/ KPMG LLP

San Francisco, California
March 28, 2002

                                                                    Exhibit 23.2

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the registration statement
(Form S-3 No. 333-70134) and the related prospectus and in the registration
statements (Form S-8) pertaining to (Nos. 333-68172 and 333-68170) the 1995
Stock Option Plan and, the Non-Employee Director Stock Option Plan of Hyseq,
Inc. of our report dated February 2, 2000, with respect to the consolidated
statements of operations, stockholders' equity and cash flows for the year
ended December 31, 1999, included in its Annual Report (Form 10-K) for the year
ended December 31, 2001.

Palo Alto, California
March 29, 2002