HYSEQ INC
10-K405, 2000-03-20
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                                 UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                   FORM 10-K
[MARK ONE]
[X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934

                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1999

                                       OR

[ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
           FOR THE TRANSITION PERIOD FROM             TO

                        COMMISSION FILE NUMBER: 0-22873

                                  HYSEQ, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                               <C>
                     NEVADA
(STATE OR OTHER JURISDICTION OF INCORPORATION OR                  36-3855489
                   ORGANIZATION)                     (I.R.S. EMPLOYER IDENTIFICATION NO.)

        670 ALMANOR AVENUE, SUNNYVALE, CA                            94086
    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                      (ZIP CODE)
</TABLE>

       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
                                (TITLE OF CLASS)

     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  [X]  No  [ ]

     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.  [X]

     The aggregate market value of the registrant's voting stock held by
non-affiliates of the registrant (without admitting that any person whose shares
are not included in such calculation is an affiliate) on March 10, 2000 was
$749,125,100, based on the last sale price as reported by The Nasdaq Stock
Market.

     As of March 10, 2000, the Registrant had 13,204,579 shares of common stock
outstanding.

                      DOCUMENTS INCORPORATED BY REFERENCE

     The following documents (or parts thereof) are incorporated by reference
into the following parts of this Form 10-K: Items 10, 11, 12 and 13 of Part III
incorporate by reference information from the Registrant's Proxy Statement to be
filed with the Securities and Exchange Commission in connection with the
solicitation of proxies for the Registrant's 2000 Annual Meeting of Stockholders
to be held on May 23, 2000.

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                                     PART I

ITEM 1.  BUSINESS

     Many of the statements in this section, including those made in "Risk
Factors," below and "Item 2. Management's Discussion and Analysis of Financial
Condition and Results of Operations," as well as those discussed elsewhere in
this Annual Report are forward looking. These may be identified by words such as
"believe," "expect," "anticipate," "should," "may," "estimated" and "potential"
among others. These forward-looking statements are based on our current
expectations which could differ significantly from those discussed in the
forward-looking statements. The Private Securities Litigation Reform Act of 1995
provides a "safe harbor" for such forward-looking statements. Forward-looking
statements involve risks and uncertainty. "Hyseq" is our registered trademark
and service mark. "HyChip" is another of our trademarks. "GeneSolutions" and
"GeneSolutions.com" are trademarks and service marks of GeneSolutions Inc., our
wholly-owned subsidiary.

GENERAL

     We research and develop biopharmaceuticals to treat acute and chronic
diseases. We are conducting preclinical studies on our IL-1Hy1 anti-inflammatory
and CD39L4 anti-clotting product candidates and are researching a number of
other product candidates for our clinical pipeline. Our biopharmaceutical
product candidates are proteins produced by novel, rarely-expressed genes. A
gene is rarely-expressed when 10 copies or less of that gene are expressed among
the hundreds of thousands of genes in a typical sample. We believe our genomics
technologies, which we have used to analyze over 12 million human DNA samples
for our own use, have given us a statistical advantage in finding novel,
rarely-expressed genes. We focused on finding these genes because scientists
believe they produce proteins, including receptors and hormones, that regulate
normal and disease conditions. Proteins produced by rarely-expressed genes
represent attractive biopharmaceutical candidates because they are more
effective in small quantities than proteins produced by highly-expressed genes.

     As of March 10, 2000, we had filed patent applications covering over
900,000 partial and full length gene sequences, including a large number of
rarely-expressed genes and the proteins they encode. We have identified over
35,000 genes with features that indicate they are capable of producing secretory
proteins or have significant homology to the coding regions of known genes. We
have completely sequenced more than 5,000 of these genes. Unlike other
technologies, our technology generates both sequence and expression data for the
samples we analyze. We use this data and screen for features indicative of size,
solubility and secretability to select proteins for biological activity
research. Novel proteins that show desired biological activity are added to our
clinical pipeline. GeneSolutions Inc., our wholly-owned subsidiary, serves as a
business-to-business marketing arm for our products, including novel genes and
proteins that we do not plan to develop by ourselves. GeneSolutions Inc. offers
these and other genomic resources over the Internet at www.GeneSolutions.com.

     We also have numerous patents and patent applications covering genomics
technologies such as our biochip. Our biochip technology now makes it possible
to sequence more than 3,000 bases of any gene in a single reaction. This read
length is at least three times longer than that produced by traditional
gel-based technology, the only other technology capable of sequencing long
segments of any gene without using a specific reference gene or sequence. This
capability allows us to identify all polymorphisms along the sequence as well as
point mutations and single nucleotide polymorphisms ("SNPs").

     In 1999, industry sales of biotechnology products, including human
gene-based products such as erythropoietin ("EPO"), human insulin, granulocyte
colony stimulating factor and tissue plasminogen activator, exceeded $13.0
billion. The large market potential for the gene-based products has led to a
worldwide effort to discover and sequence the estimated 150,000 genes in the
human genome and to develop genomics technologies, including biochips, for
facilitating such discovery, with the ultimate goal of developing new drugs and
treatments for combating disease.
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     We have gene-based collaborations with American Cyanamid Company in the
agricultural field; Chiron Corporation in solid tumor cancers; Kirin Brewery
Co., Ltd. to discover novel genes relating to a specific growth factor activity
from certain Kirin cell lines; University of California, San Francisco to
sequence and annotate DNA samples to develop cardiovascular polymorphism and
pharmacogenomics data. While we are completing our gene discovery work on the
human genome for ourselves and under the Chiron and Kirin collaborations, we
have initiated our collaboration work with American Cyanamid in the agricultural
field. We will participate with Kirin to identify product candidates for further
development and co-marketing.

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 genetic information of
organisms, is a growing field that is expected to lead to the development of
additional gene-based therapeutics like EPO.

  The Genetic Code

     The entire genetic content of each organism, known as its genome, is
encoded in deoxyribonucleic acid ("DNA"). DNA, which is found in cells, is a
molecule comprising two single 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.

     A gene comprises a series of groupings of three bases on a DNA strand that
encodes specific amino acids which, in turn, combine to form proteins. Gene
sequencing is the process of determining the order in which these bases are
linked together to form a gene. Scientists believe that approximately 10% of
human DNA comprises genes, with most of the remaining 90% being of unknown
function. We believe the human genome contains approximately 150,000 genes which
encode proteins. Proteins are essential to cellular structure, growth and
function and, thus, are the principal determinants of an organism's
characteristics.

     Scientists believe that each gene has two basic regions, a structural
region and a regulatory region. The structural region of a gene encodes a
specific protein. The process by which the structural region of a gene directs
the production of a protein is known as gene expression. In that process, the
sequence of bases in a gene is copied into a related molecule called messenger
ribonucleic acid ("mRNA"). The mRNA instructs the cell to combine amino acids
together in a particular order to form a protein. The regulatory region of a
gene is responsible for the rate of gene expression and the resultant amount of
a given protein produced in specific cells of the body.

  The Relationship Between Genes and Disease

     Because genes encode proteins, which govern substantially all functions of
the human body, the sequences of genes and their levels of expression determine
when, where and how well essential functions are performed. The addition,
deletion or substitution of one or more bases in a gene, known as a mutation,
can alter a protein or a gene's level of expression and result in a disease
condition. For example, whether a cell is cancerous or normal may depend upon
the presence or absence of a mutation in the p53 human cancer suppressor gene.
Similarly, scientists believe that whether an individual develops acquired
immune deficiency syndrome ("AIDS") upon infection with the human
immunodeficiency virus ("HIV") is, in part, a function of at least one human
gene sequence. Moreover, the susceptibility of a particular strain of HIV to
drug treatment may depend upon the sequence of the viral strain's genome. Most
diseases are believed to be polygenic, meaning that multiple genes interact to
cause or affect a disease condition. In developing a drug for a polygenic
disease like diabetes, the most effective target may be best selected when all
genes which interact to cause or affect the disease are known.

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  Applications of Genomics to Understanding Disease

     Detailed knowledge of gene sequences that encode missing, defective or
abnormally expressed proteins and an understanding of gene interactions in
disease conditions offer the potential to develop novel therapeutic products and
diagnostic tests. Genomics provides the basis for developing drugs designed to
replace missing or defective proteins or to deactivate or limit the effect of
proteins that are present at excessive levels. Drugs also may be designed to
supplement proteins produced by normal genes. For example, anemia can be treated
by injecting a patient with EPO, a protein that stimulates the production of red
blood cells. Drugs also may be designed to remedy the effects of defective genes
by affecting their expression. In addition, diagnostic tests for diseases can be
developed by determining gene sequences that predispose individuals to
gene-related diseases.

     Several genomic applications, including polymorphism screening, gene
expression level studies and gene identification, can provide critical insight
into understanding disease and developing for rapeutic products and diagnostic
tests. Polymorphism screening involves sequencing the same gene in each member
of a population of healthy and diseased individuals to find naturally occurring
variations or "polymorphisms" in the gene sequence and correlating those
polymorphisms with the disease condition. Expression level studies compare the
levels at which genes are expressed in healthy and diseased individuals to
correlate differences with the disease condition. Gene expression can be used to
find genes, including genes expressed at low levels.

  Rarely-Expressed Genes

     Some genes are said to be "rarely" expressed because their corresponding
mRNA is rarely found in tissue samples or 10 copies or less of a gene are
expressed among the hundreds of thousands of genes in a typical sample.
Scientists believe that rarely-expressed genes encode regulatory proteins of all
kinds, including receptors and hormones. Out of the hundreds of thousands of
mRNAs present in a typical tissue sample, only a few copies of mRNA are present
for rarely-expressed genes. This rarity requires that large numbers of cDNAs
need to be analyzed before the cDNA of a rarely-expressed gene is found.
Proteins produced by rarely-expressed genes represent attractive
biopharmaceutical candidates because they are more effective in small quantities
than proteins produced by highly expressed genes.

APPLICATIONS OF OUR TECHNOLOGY

  Gene Discovery

     To identify the best potential therapeutic and diagnostic product
candidates, we have analyzed over 18 million human DNA samples, including over
12 million for our own use, from selected human tissues to discover
disease-related human genes and their functions. Our DNA analysis capacity
presently is more than 1.5 million samples per month. We have focused on finding
the rarely-expressed genes in these tissues. By obtaining information about the
degree to which a small number of probes hybridize to a cDNA, we generate a
unique intermittent partial sequence called a signature for that cDNA. We use
signatures for identifying genes and for characterizing their functions.
Traditional gel sequencing generates short sequences, known as expressed
sequence tags ("ESTs"), which are only partial sequences of one end of a cDNA.
Because our signatures are spread throughout the cDNA, and not just at its end
as is the case with ESTs, we believe that the signature process is more accurate
than the EST process in determining the identity of a cDNA and, as a result,
whether it represents a known or new gene. By comparing such signatures, the
number of identical, similar and different cDNAs can be determined and
inventoried. We compare our DNA sequence information against other sequences in
our databases and sequences of known genes and proteins in public databases. We
believe that information generated by these comparative analyses may facilitate
the development of potential therapeutic products and diagnostic tests. We
believe that our proprietary database of more than 12 million partial human gene
sequences is one of the largest such databases in the world.

  Expression Monitoring

     The relative gene expression levels corresponding to cDNAs can be
determined by comparing the number of copies of each signature found in
collections of cDNA samples such as those obtained from diseased and normal
tissues or before and after drug administration. Our signature analysis differs
from other technologies

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in that it can provide both sequence identity and expression level information
in one analysis. Furthermore, unlike other approaches, expression levels of all
expressed genes, can be determined. We believe that our high-throughput
screening of large DNA sample libraries helps to determine a gene's function by
examining the gene's pattern of expression. For example, a gene expressed in the
human prostate during the early stages of cancer, but not expressed in other
tissues or at other times, may be a marker for the cancer and may provide
insights into the biological mechanism of the cancer. We have analyzed millions
of DNA samples from a number of tissue types to determine relative gene
expression levels.

  Polymorphism Screening and Pharmacogenomics

     By correlating a polymorphism with a specific condition, polymorphism
screening can be used to determine the significance of gene regions to the
function of the gene as a whole. This correlation assists in targeting
pharmaceuticals to appropriate regions of gene products (e.g., to a binding site
of a receptor). In a polymorphism study, the more types of sequences that are
screened, the more information regarding variability is obtained.
Pharmacogenomic analysis identifies individual patients who benefit from
specific drugs in a safe and efficient way. Our technology is designed to
sequence numerous samples simultaneously. Conducting a successful polymorphism
or pharmacogenomic sequencing study may require the ability to accurately
sequence billions of bases per year, which we believe our technology can provide
more cost-effectively than other technologies. Our collaboration with the
University of California, San Francisco in cardiovascular and related diseases
has been designed to capitalize on our high-throughput capacity.

  Infectious Diseases

     We believe that our proprietary technology has the potential to
significantly improve the understanding of infectious diseases and thereby
advance their diagnosis and treatment. Mutations in the HIV genome have been
correlated with the success of various therapies, and rapid mutation in the HIV
genome is an indicator of progression of the disease. We have conducted tests
demonstrating that our HyChip biochips can accurately sequence HIV and bacterial
samples. We believe that this is the first time that a set of probes capable of
completely sequencing all mutations has been reported to be applied to HIV
sequence samples. In 1999, we completed a joint project with Lawrence Livermore
National Laboratories in which the single-base accuracy of our HyChip biochip
allowed it to identify not only the family and species of an unknown infectious
organism, but also the specific strain of that organism.

COMPANY TECHNOLOGY

     We believe that our sequencing capacity and flexibility make our technology
appropriate for a large number of therapeutic and diagnostic applications. In
the discovery stage, we believe our high-throughput proprietary genomics
technologies have given us an advantage by decreasing the cost and time required
to screen large numbers of DNA samples. We have analyzed over 12 million human
DNA samples for our own use. We have screened the resulting human gene sequences
for features indicative of size, solubility and secretability. We also employ
bioinformatics software to group and analyze these sequences for similarities to
the sequences of genes for which potentially valuable pharmaceutical properties
are known. The proteins that have favorable features and show biological
activity are added to our clinical pipeline.

  Higher Throughput

     Identification of Rarely-Expressed Genes.  Scientists believe that
rarely-expressed genes encode regulatory proteins of all kinds, including
receptors and hormones. Because rarely-expressed genes are represented by far
fewer copies of mRNA in a given tissue sample than highly-expressed genes, large
numbers of cDNAs may have to be analyzed before the cDNA of a rarely-expressed
gene is found. In gene discovery, we presently analyze batches of approximately
50,000 DNA samples that can be 1,000 to 2,000 bases in length each (up to
approximately 500 million total bases per batch). We believe that our
high-throughput technologies significantly enhance our ability to analyze the
large number of cDNAs necessary to find rarely-expressed genes. Out of the
hundreds of thousands of mRNAs present in a typical tissue sample, only a few
copies of

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mRNA for rarely-expressed genes are present. Our technology identifies a copy of
mRNA that appears only once per cell in such a tissue sample.

     Ability to Obtain More Gene Targets for Monogenic and Polygenic
Diseases.  Researchers have focused primarily on identifying a gene that may be
involved in a particular disease due to throughput limitations of prevailing
technologies. While this may be an effective approach to understanding monogenic
disorders in which one gene is the predominant cause of a disease, most diseases
are believed to be polygenic. We believe that our gene sequencing approach
provides researchers with an industrial-scale tool for comprehensively analyzing
gene identities and expression levels in a cell or tissue. Similarly, effective
gene interaction studies that identify genes involved in polygenic diseases
under various conditions requires processing of millions of cDNAs. We believe
that our DNA analysis capacity of over 1.5 million samples per month has given
us an advantage in performing effective gene identification and gene interaction
studies that are necessary to identify multiple gene targets.

     Ability to Effectively Conduct Polymorphism Screening.  Rarely-expressed
genes correlated with disease may be sequenced to identify polymorphisms in an
attempt to understand what significance, if any, mutations may have.
Polymorphism screening for such polygenic diseases typically involves sequencing
many genes, some or all of which may be thousands of bases in length, from
thousands of healthy and diseased individuals. An understanding of polygenic
disease also requires analysis of gene interactions that cause or affect the
disease. We believe that effective polymorphism screening, which has
applications ranging from determining patient populations that will be most
responsive to drug therapies to determination of gene functions, requires the
ability to sequence billions of bases per year. Recent advances with our biochip
technology now make it possible to sequence more than 3,000 bases of any gene in
a single reaction. We believe that this advance makes it a powerful tool for
large scale SNP and other polymorphism detection. We believe that our ability to
detect any of the millions of human SNPs makes our chip an important tool in
pharmacogenomics and for diagnostic use in personalized disease treatments.

  Greater Flexibility

     Determining a gene's utility is a critical step in patenting and
commercializing a gene or gene product. We believe that the flexibility of our
technology allows our researchers to obtain functional information from gene
expression studies, polymorphism studies and complete sequences. Unlike
prevailing technologies, our ability to sequence genes at multiple levels of
completeness makes it appropriate for a large number of therapeutic and
diagnostic applications.

  High Degree of Accuracy

     Because our SBH technology compiles multiple overlapping sequences of bases
for each DNA sample, thereby providing multiple verifications of each base in a
sequence, it offers a high degree of accuracy. Accuracy is critical in patenting
genes because a patent claim containing inaccurate sequence information can
nullify the protection intended by the patent. In diagnostics, accuracy is
critical to avoiding misdiagnoses and possible injury to patients. Our HyChip
system also can accurately sequence mutations in the form of insertions or
deletions of bases.

OUR STRATEGY FOR COMMERCIALIZING PRODUCTS

     We have adopted a two-pronged product development strategy. Our primary
focus is to discover, identify and patent human gene information in order to
develop therapeutic product candidates for the treatment of acute and chronic
diseases. We isolate genes coding for soluble proteins, including those that are
novel homologs of existing, commercially valuable, gene-based products. Those
proteins that show biological activity are then selected for further research.
We are conducting preclinical studies on our IL-1Hy1 anti-inflammatory and on
CD39L4 anti-clotting product candidates. We may, in the future, seek to enter
into partnerships with third parties to share costs of developing these and
other product candidates. However, there can be no assurance that we would find
willing partners on favorable terms.

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     As a secondary focus to help fund our product development efforts, we have
established gene discovery collaborations with third parties and are continuing
to develop our genomics technologies for possible sale or licensing to third
parties. We presently have collaborations with: American Cyanamid Company in the
agricultural field; Chiron Corporation in solid tumor cancers; the
Pharmaceutical Division of Kirin Brewery Co., Ltd. to discover novel genes
relating to a specific growth factor activity from certain Kirin cell lines;
University of California, San Francisco to sequence and annotate DNA samples to
develop cardiovascular polymorphism and pharmacogenomics data; and PE
Corporation to distribute our HyChip universal DNA sequencing biochip. In
addition to the over 12 million DNA samples we have analyzed for our own use, we
have analyzed over 8 million DNA samples for Chiron, Kirin and American
Cyanamid. While we are completing our human genome gene discovery work for
ourselves and under the Chiron and Kirin collaborations, we have just initiated
our collaboration work with American Cyanamid. We will participate with Kirin to
identify product candidates for further development and co-marketing.

     Our collaboration with American Cyanamid requires it to make payments of
milestones, research funding, royalties, up-front payments and license fees. We
and American Cyanamid also have the right to develop non-agricultural products
using results of the collaboration, subject to payments of royalties. Our
collaboration with Chiron requires it to make payments of milestones, research
funding, royalties, up-front payments and license fees. With Chiron, we have
identified 31 gene targets that are consistently differentially expressed in
highly metastatic versus non-metastatic cancer. We have identified 51 gene
targets from Kirin cell lines for further research. We have exclusive marketing
rights in North America and co-marketing rights in the rest of the world (except
Asia and Oceania) for any products that may come from the Kirin targets.

OUR PRODUCT DEVELOPMENT PROGRAM

     Our product development program begins with our functional genomics group
identifying and evaluating genes that may be useful in the creation of
protein-based therapeutic drugs or targets for small molecule drugs. When
analysis indicates that a protein is of interest, this group isolates the
corresponding full-length cDNA, determines the pattern of tissue expression and
the entire coding sequence. We intend to develop high-throughput methods to link
these potentially valuable genes to important disease states, thereby creating
therapeutic and diagnostic tools for the medical community. The protein
purification group provides proteins for in vitro and in vivo testing. The group
has available bacterial, insect and mammalian expression systems that produce
proteins. The group tests for in vitro and in vivo activity of therapeutic
protein candidates and also evaluates mechanisms of action. Additional staff
will be responsible for safety studies and for preclinical animal testing of our
therapeutic protein product candidates as we continue development. We may use
contract research organizations to conduct toxicology, pathology and clinical
trials on our lead therapeutic protein product candidates.

     We believe that because our product candidates are natural products of
genes found in the general population, our ability to determine the sequence and
expression levels of genes gives us an advantage in understanding their function
and expediting clinical trials by observing how our product candidates work in
human subjects. We believe our technology gives us a unique window on gene
sequences and expression levels. Sequence and expression levels are the two
basic parameters that determine how active and how much of a gene product is
present in human samples. We track sequence and expression levels to develop
product candidates for pharmaceutical indications.

     Even before entering clinical trials, we believe we will be able to obtain
information on how our product candidates work in real people. By sequencing a
gene that produces a product candidate in thousands of human samples, and by
correlating the gene sequence with corresponding medical records, we may be able
to observe how gene sequences that affect activity relate to human health. By
also correlating variation in the gene's sequence with corresponding medical
records, we may be able to determine the effect of dosage of our gene product on
health. Finally, by examining the sequence and expression level of genes that
produce products which interact with our product candidate (such as competitive
inhibitors, degrading enzymes and receptors), we may obtain a high resolution
picture of how our product works in the body.

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     Using information derived from the application of our technology to DNA
samples, we may be able to enhance the clinical trials process by identifying
those subjects who can benefit from our product candidate versus those who would
not. This information may be helpful in expediting regulatory review and also
provides a diagnostic test once the product is on the market.

OUR CLINICAL PIPELINE

     We believe our proprietary genomics technologies have given us an advantage
in building our clinical pipeline because they have allowed us to find genes
expressed at low levels. Such genes are said to be "rarely" expressed because
their corresponding mRNA is rarely found in tissue samples. Rarely-expressed
genes represent attractive therapeutic product candidates because the proteins
they produce may be more effective in small quantities than proteins produced by
highly-expressed genes.

     In the second half of 1998, we began selecting product candidates for our
clinical pipeline. A substantial number of proteins that are encoded by our
novel, rarely-expressed genes appear to be homologs of gene products that are
known soluble factors and receptors. Soluble factors and receptors are molecules
that regulate normal and disease state physiology. As we cannot develop all of
these molecules, we use a ranking system for further development in our clinical
pipeline. In addition to scientific factors, we consider a number of economic
factors such as potential market size and degree of similarity to known
biopharmaceutical drugs. Product candidates that rank highest overall are then
selected for further development. In addition to our primary product candidates,
IL-1Hy1 and CD39L4, our collection of human genes provides a broad base of
product opportunities, including chemokines, growth factors, stem cell factors,
interferons, integrins, hormones and their receptors and other interleukins from
which to select additional proteins for research and development.

     The chart below indicates the stage of development for the announced
product candidates in our clinical pipeline as of December 31, 1999. The chart
does not identify product candidates being identified with our partner, Kirin
Brewery Co., Ltd. for joint marketing and development under our Kirin
collaboration.

<TABLE>
<CAPTION>
CANDIDATE                                      POTENTIAL APPLICATIONS    DEVELOPMENT STAGE
- ---------                                      ----------------------    -----------------
<S>                                            <C>                       <C>
IL-1Hy1......................................  Inflammatory Diseases     Preclinical
IL-1Hy2......................................  Inflammatory Diseases     Research
CD39L4.......................................  Heart Disease             Preclinical
CD39L2.......................................  Heart Disease             Research
</TABLE>

  IL-1Hy1: Product Candidate for Treating Inflammatory Disease

     We believe that our IL-1Hy1 protein may have therapeutic applications in
the treatment of inflammatory disease. In 1999, Hyseq's scientists published
results for IL-1Hy1 in Biochemical & Biophysical Research Communications.
IL-1Hy1 was found to be expressed in the skin, spleen and other tissues
consistent with its potential role as a mediator of inflammatory processes. In
addition, our research demonstrated that IL-1Hy1 can be activated by signals
that induce inflammation and immune responses. We are focusing research on the
protein's potential ability to disrupt the process of inflammation in such
diseases as rheumatoid arthritis and inflammatory bowel disease. According to
industry sources, rheumatoid arthritis and inflammatory bowel disease affect
approximately 6 million people in the United States alone.

  CD39L4: Product Candidate for Preventing Blood Clotting

     We believe that our CD39L4 anti-clotting product candidate could help
prevent or treat blood vessel blockage that can cause cardiovascular disease
such as heart attacks and strokes. In 1999, Hyseq's scientists published results
for CD39L4 in The Journal of Biological Chemistry. When blood vessels are
damaged, a substance called adenosine diphosphate (ADP) is released at the site
of injury to initiate blood clotting for repair. In cardiovascular disease,
blood clotting can be excessive and result in blockage of blood vessels. By
decreasing the levels of ADP, abnormal clotting and blockage of blood vessels
may be reduced. CD39L4 breaks down ADP but does not significantly affect a
related substance, adenosine triphosphate (ATP) that

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regulates other physiological processes. This specificity makes CD39L4 a
promising therapeutic candidate. According to industry sources, approximately 59
million people in the United States suffer from cardiovascular disease.

OTHER PRODUCTS

  Cardiovascular Polymorphism Database

     We are developing a cardiovascular polymorphism database in conjunction
with the University of California, San Francisco. In constructing the database,
we and the University are conducting population genetic and pharmacogenomic
research on genes that may have important roles in the development of
cardiovascular and related diseases. We believe our database will assist us and
other future users in thoroughly understanding the roles of genes, gene
mutations and polymorphisms that may lead to diseases of the cardiovascular
system.

  HyChip Biochip

     We presently use our universal DNA sequencing HyChip biochip internally and
with third parties for testing purposes. In 1999, we completed a joint project
with Lawrence Livermore National Laboratories in which the single-base accuracy
of our HyChip biochip allowed it to identify not only the family and species of
an unknown infectious organism, but also the specific strain of that organism.
We also made advances that allow our biochip technology to sequence more than
3,000 bases of any gene in a single reaction. This read length is at least three
times longer than produced by traditional gel-based technologies, the only other
technology capable of sequencing long segments of any gene without using a
specific reference gene or sequence. We believe that this advance makes our
HyChip biochip a powerful tool for large-scale polymorphism detection as well as
in determination of point mutations and single nucleotide polymorphisms
("SNPs"). Our HyChip biochip can be used with commercially-available,
off-the-shelf readers.

  GeneSolutions Inc.

     Our wholly-owned subsidiary, GeneSolutions Inc., serves as a
business-to-business marketing arm for our products, including novel genes and
proteins that we do not plan to develop by ourselves. GeneSolutions offers these
and other genomic resources over the Internet at www.GeneSolutions.com.
GeneSolutions also offers gene-analysis information for public domain genes, as
well as a number of our proprietary genes, on a point-and-click basis over the
Internet. We may, in the future, use GeneSolutions as a catalog for sale of
HyChip biochips and customized arrays using public domain and custom sequences
(including sequences licensed to third parties by GeneSolutions). The
GeneSolutions website offers three basic types of information:

     - DNA sequence information;

     - homology data (i.e., similarity to genes in the public databases); and

     - tissue expression data.

     We believe advantages of GeneSolutions are:

     - free access to the GeneSolutions website analysis of genes and homologs;

     - easy, point-and-click access to gene sequences, tissue expression data
       and homology information;

     - genomic information available to a broad group of potential buyers
       including universities, research institutes, small start-up companies,
       large pharmaceutical companies. Additional market segments may also be
       reached, including users of genomic information for clinical trials and
       DNA diagnostic applications.

     Genomic information is available on the website on a cost-per-item basis
rather than through subscription or access fees. This gene-analysis and
expression data and related information is not presently available from other
sources in a simple, user-friendly format such as the Internet.

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     We believe a major benefit of GeneSolutions is the breadth of gene-analysis
information it offers. We believe this access to public and proprietary genomic
sequence and homology information, coupled with functional attributes can
improve analysis and reduce processing time for such activities as
genomics-based drug development, diagnostics and health care.

     Users may be able to strengthen their patent portfolios through licensing
of additional or competing rights held by Hyseq or GeneSolutions. These benefits
may enable users to:

     - find and license additional family members of a gene product that is
       being considered as part of a research program by adding rights to
       additional family members; for example, a licensee may (i) gain
       protection against development of a product around another family member
       that may have a better pharmaceutical profile thus helping to prevent a
       competitor from announcing a better product; or (ii) use a previously
       unknown gene family member to gain insight on how the product in question
       functions.

     - piece together the intellectual property rights to a gene product for
       freedom to operate purposes; for example, (i) Hyseq or GeneSolutions may
       have a senior position in a gene or in a gene's function; or (ii) because
       it has been a common practice for genomics and other companies to file
       patent applications covering ESTs, users may want to fill in rights on
       ESTs that are covered by Hyseq or GeneSolutions patent rights. Since our
       technology automatically compiles sequences along a gene as it sequences,
       the GeneSolutions information shows the user exactly where the piece in
       question "fits" along the gene, and

     - gain information about genes that are co-expressed with the gene in
       question, thus providing additional insight on pathways and related
       information.

     Other offerings on our GeneSolutions website include a message board and
gene exchange. GeneSolutions hosts a message board for visitors to discuss
genomics issues and to browse through messages for ideas and information. We
believe the message board should bring more visitors to GeneSolutions and
establish the site as a focal point for genomic research. GeneSolutions also
offers to act as a consignment agent for customers around the world who wish to
sell or license their genomic material in an e-commerce market.

COLLABORATIONS

     As we are now completing our gene discovery work on the human genome and
transitioning into development of our own biopharmaceutical products, we have
narrowed the scope of our collaborations in the human genome arena. Consistently
with the narrowed scope, our collaboration with Kirin Brewery Company, Ltd.
requires us to apply our gene discovery technology to certain Kirin cell lines
and relates only to novel genes with a specific growth factor activity. We
retained exclusive marketing rights in North America and co-marketing rights in
the rest of the world (excluding Asia and Oceania) with respect to discoveries
from the Kirin collaboration. We may, in the future, seek to enter into
partnerships with third parties to share costs of developing these and other
product candidates. However, there can be no assurance that we would find
willing partners on favorable terms.

  American Cyanamid Company

     In December 1999, we entered into an exclusive collaboration with American
Cyanamid Company to develop agricultural products. 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. Through January 2000, American Cyanamid had made cash payments
of $9.0 million to us under our agreement. American Cyanamid 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.

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  Chiron Corporation

     In May 1997, we entered into an exclusive collaboration with Chiron
Corporation to develop solid tumor cancer therapeutics, diagnostic molecules and
vaccines. The collaboration agreement has an initial term of three years ending
on May 31, 2000, and can be extended at Chiron's option for two additional
two-year periods. Chiron paid a nonrefundable $1 million up-front licensing fee
upon signing the agreement and guaranteed payment of a minimum of $8.5 million
in the first year and $5.5 million in each of the two years thereafter in
connection with our research on Chiron tissue sample libraries. Chiron has the
exclusive right to commercialize any solid tumor 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. Chiron also invested $7.5 million
in us in conjunction with the collaboration. As of March 10, 2000, we had
processed over 6 million samples for Chiron and the collaboration has resulted
in the filing of patent applications covering over 8,800 gene discoveries.
Chiron has announced the identification of 31 gene targets that are consistently
different in highly metastatic versus non-metastatic cancer. Our gene-sequencing
obligations under the original term of the agreement are substantially
completed.

  Kirin Brewery Co., Ltd.

     In October 1998, we entered into a collaboration with the Pharmaceutical
Division of Kirin Brewery Co, Ltd. of Japan in which we use our proprietary
genomics platform to target novel genes from specific cell lines provided by
Kirin. We retained rights in North America to develop pharmaceutical products
resulting from the collaboration, subject to milestone and royalty payments to
Kirin. Kirin will have equivalent marketing rights in Asia and Oceania. We will
share rights equally in Europe and in the rest of the world. We have announced
the identification of 51 gene targets for the collaboration. Our gene-sequencing
obligations under the original term of the agreement are substantially
completed.

  PE Corporation

     In May 1997, we entered into an agreement with PE Corporation to
commercialize HyChip products. Pursuant to the terms of the agreement, we
committed $5.0 million to further development of the biochip component of the
HyChip system. We satisfied the commitment in 1998. PE Corporation also must
commit certain funds for development of the overall system. The collaboration
has an initial term of five years and will be extended automatically thereafter
unless the parties mutually agree to termination. The agreement required us to
design, develop and manufacture the HyChip biochip, while PE Corporation is
responsible for the design, development and manufacture of the system, as well
as marketing and customer support. We began producing HyChip biochips in 1998
and presently are using them with commercially-available, off-the-shelf readers
for internal research projects. PE Corporation also invested $10.0 million in us
in conjunction with the collaboration.

  University of California, San Francisco

     In February 1998, we entered into an agreement with the University of
California, San Francisco to conduct research on genes that may have important
roles in the development of cardiovascular and related diseases. We believe this
project will generate sequence data to help thoroughly understand the roles of
genes, gene mutations and polymorphisms that may lead to diseases of the
cardiovascular system. Under the agreement, researchers at the University of
California, San Francisco are collecting DNA samples from up to 20,000
genetically diverse individuals. DNA samples are being sequenced and annotated
and added to our proprietary sequence databases. We believe that the resulting
information will create a cardiovascular polymorphism database with the
potential to identify genetic traits in heart disease, hypertension and
diabetes. We have the exclusive rights from the University of California, San
Francisco to commercialize the proprietary sequence databases derived from this
collaboration.

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COMPETITION

     Our strategy as a biopharmaceutical company has been 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 these
genes. There are a finite number of genes in the human genome, virtually all of
which will be identified within the next few years by us and our competitors.
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 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 which we, alone or with our
collaboration partners, may develop, obsolete or uneconomical or result in
treatments, cures or diagnostics superior to any therapy or diagnostic developed
by us, alone or with our collaboration partners, or that any therapy we develop,
alone or with our collaboration partners, will be preferred to any existing or
newly developed technologies. Certain of our collaboration partners may now be,
or could become, competitors.

     We currently generate our revenues primarily from gene discovery
collaborations. We believe that our ability to enter into additional gene
discovery collaborations is dependent, in part, upon our ability to continue to
improve our technology to permit more rapid identification of genes and improve
our bioinformatics capacity for analyzing gene sequences and identifying the
possible function of the genes sequenced. 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. Loss of our SBH patent rights also could
remove a legal obstacle to competitors in designing platforms with similar
competitive advantages Competition in this field is expected to intensify.

     In the area of chip products, we compete primarily with Affymetrix, Inc.
See "Item 3. Legal Proceedings," regarding our litigation against Affymetrix,
Inc. Additionally, although we are collaborating with PE Corporation to develop
HyChip products for commercial applications, PE Corporation presently markets
gel sequencers that are used by its affiliate, Celera, and other third parties
to compete with us in gene discovery and diagnostics. We believe that our
ability to compete in the chip arena will depend primarily upon our ability to
demonstrate that the HyChip system and our other biochip-based products can
provide higher levels of accuracy and a lower cost than other prevailing
technologies. Additionally, although we believe that the ability of the HyChip
system to accommodate new tests through software modifications will be
attractive to clinical reference laboratories, biochips such as those being
marketed by Affymetrix, Inc. may be competitive for certain applications.

PATENTS AND PROPRIETARY TECHNOLOGY

  Patent Rights Relating to Technology

     We hold nine United States patents with claims covering the methods and
applications for SBH, apparatus and processes. We also have pending several
patent applications covering SBH technology, as well as applications covering
apparatus, materials, kits and processes. If granted, these pending applications
would provide supplementary protection in related areas of potential interest.

  Patent Rights Relating to Genes and Proteins

     We file for patent protection on commercially relevant genes and their
products and partial gene sequences. Through March 10, 2000, we had filed patent
applications covering over 900,000 partial and full-length gene sequences,
including a number of rarely-expressed genes and the proteins they express.
Patenting

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full-length genes is a well-recognized commercial practice in the United States.
For example, valuable human genes such as those encoding EPO (patent owned by
Amgen, Inc.), granulocyte colony stimulating factor (patent owned by Amgen,
Inc.), tissue plasminogen activator (patent owned by Genentech, Inc.), and
interleukin-2 muteins (patent owned by Chiron Corporation) have been patented.
Many more are claimed in patent applications, including patent applications
filed by our competitors. Patenting proteins produced by genes also is a
well-recognized commercial practice.

     Some court decisions have indicated that disclosure of a partial sequence
may not be sufficient to support the patentability of a full-length sequence. We
believe that there is significant risk that patents will not issue based on
patent disclosures limited to partial gene sequences. Even if patents issue on
the basis of partial gene sequences, there is uncertainty as to the scope of the
coverage, enforceability or commercial protection provided by any such patents.
We believe that our SBH and other technologies enable complete sequencing of
genes more rapidly and cost effectively than other existing technologies. We
also believe that our technologies facilitate correlation between gene sequences
and gene functions. This information, which our competitors often lack, is
critical in obtaining patents. We believe that this information would be useful
for satisfying the current requirements for obtaining patents on genes in the
manner followed by the biotechnology companies over the past 10 years. See "Risk
Factors -- Dependence upon Proprietary Rights; Risks of Infringement."

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 The Argonne National Laboratories, to further develop and
use certain SBH super chip improvements developed by one of our chief scientists
while he was at Argonne. In July 1997, we began paying limited royalties. The
HyChip system, which we are developing for commercial applications with PE
Corporation, utilizes our super chip technology.

GOVERNMENT REGULATION

     The Food and Drug Administration or FDA regulates drugs, biologicals and
medical devices under the Federal Food, Drug and Cosmetic Act and other laws,
including, in the case of biologics, the Public Health Service Act. These laws
and implementing regulations govern, among other things, the development,
testing, manufacturing, record keeping, storage, labeling, advertising,
promotion and pre-market clearance or approval of products subject to
regulation. Pharmaceutical products that we develop, alone or with a
collaboration partner, probably will be regulated by the FDA as drugs or
biologicals. Diagnostic products, including HyChip products sold for clinical
use, also likely would be regulated as medical devices or biologicals.

     The following is a discussion of the government regulations to which we may
be subject.

  FDA 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 our products and those of Chiron Corporation 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. The time required for
completing such testing and obtaining such approvals is uncertain. Any delay in
clinical testing may 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 collaborating partners to obtain regulatory
approval could adversely affect the commercialization of products we or they are
developing, our ability to receive product collaboration milestone or royalty
revenue and, thus, our liquidity and capital resources.

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     Preclinical studies are generally conducted in the laboratory to evaluate
the potential efficacy and the safety of a therapeutic product. The results of
these studies are submitted to the FDA as part of an 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 by the subject. 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, large-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 others. The FDA, the clinical trial sponsor or the
investigator may suspend clinical trials at any time if it believes that
clinical subjects are being exposed to an unacceptable health risk.

     The results of preclinical and clinical testing are submitted to the FDA in
the form of an NDA for small molecule products or a BLA for biological products.
In responding to an NDA or BLA, the FDA 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 materially affect 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.

     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.

     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 and device 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. We also may be required to comply with
standards prescribed by various other federal, state and local regulatory
agencies in the United States as well regulatory agencies in other countries. We
will need to comply with cGMP regulations to manufacture HyChip diagnostic
products for sale to third parties. We will need to spend funds, time and effort
to ensure full technical compliance with the regulations. The FDA stringently
applies regulatory standards for manufacturing.

     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. The FDA also would regulate
labeling and promotion of our medical devices. In addition, the FDA would
require that we provide information whenever there is reasonable evidence to
suggest that one of our drugs or devices may have caused or contributed to a
death or serious injury, or a medical device malfunction that has occurred would
be likely to cause or contribute to a death or serious injury if the malfunction
were to recur.

  Environmental Regulation

     We are subject to federal, state and local laws and regulations governing
the use, storage, handling and disposal of hazardous materials such as P(33), a
low energy radioactive isotope used in labeling our probes and certain waste
products. Although we believe that our safety procedures for such materials
comply with the standards prescribed by state and federal laws and regulations,
the risk of accidental contamination or injury

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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, 1999, we had 161 full-time equivalent employees, including
140 scientists. Thirty-two of our employees hold doctorate degrees. No employees
are represented by unions. We believe that relations with our employees are
good.

RISK FACTORS

  Our Ability To Commercialize Gene-Based Products is Unproven

     We, alone or with our collaboration partners, have not developed any
therapeutic or diagnostic products using proteins produced by the genes we have
discovered. Before we, alone, or in conjunction with our collaboration partners,
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 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. 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 our primary product
candidates, IL-1Hy1 and CD39L4. However, a commercially viable product may never
be developed from our gene discoveries by us alone or with our collaboration
partners.

     Our development of products is subject to several risks, including:

     - the possibility that a product is toxic, defective or unreliable;

     - we may fail to obtain regulatory clearance for the product;

     - the product may be hard to manufacture on a large scale or may not be
       economically feasible to market;

     - competitors may develop a superior product; or

     - other people's or companies' copyrights and/or 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 therapeutic products have
advanced to Phase I clinical trials. Our programs may not move beyond their
respective 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 safe 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 Corporation in the solid
tumor cancer field, Chiron maintains responsibility for the development of a
product. Under our collaboration arrangement with Kirin Brewery Co., Ltd., Kirin
has primary responsibility for clinical development in its territory and we have
primary responsibility in our territory. 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.

     If a product receives authorization from the United States Food and Drug
Administration ("FDA") to enter clinical trials, then it may be subjected to
multi-phase, multi-center clinical studies to determine its safety and efficacy.
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
takes several years. Upon completion of such review, the

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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 successfully market such
products. If we, alone, or in conjunction with our collaboration partners, do
not develop a commercially viable product based on the genes we have discovered,
then we would suffer significant harm to our business, financial condition and
operating results.

  We are Dependent Upon Collaborative Arrangements

     Because we have entered into research and development collaborations with
our collaboration partners at an early stage of product development, our success
with respect to future payments of product revenues by our collaboration
partners is highly reliant upon the performance of our collaboration partners.
Under existing collaborative arrangements, our collaboration partners are
generally required to (1) undertake and fund certain research and development
activities with us, (2) make payments upon achievement of certain scientific
milestones and (3) pay royalties when and if they commercially market a product.
We do not directly control the amount or timing of resources devoted to
development activities by our existing or future collaboration partners. We,
therefore, face a risk that any of our existing or future 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
longer-term expectations of royalties and milestone payments related to such
collaboration arrangement could be delayed or terminated. 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.

     The success of our business is dependent, in significant part, upon our
ability to enter into multiple collaboration arrangements and to effectively
manage 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 to manage simultaneously a number of collaboration arrangements
may not be successful, and the failure to effectively manage such collaborations
would significantly harm our business, financial condition and results of
operations.

  We Have a History of Operating Losses

     For the years ended December 31, 1999, 1998 and 1997, we had net losses of
$18.5 million, $16.4 million, and $6.5 million respectively. As of December 31,
1999, we had an accumulated deficit of $49.7 million. In addition, we expect to
have losses at least through 2001 because we need to continue to invest
substantial sums in research and development of our products. Our current
undertakings include:

     - continued development of IL-1Hy1 and CD39L4 product candidates;

     - the addition of gene product candidates to our clinical pipeline;

     - continuation of our complete gene sequencing program; and

     - satisfaction of our obligations under existing collaboration
       arrangements.

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We may never achieve significant revenues or show a profit.

  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 with respect to our
       biopharmaceutical product candidates;

     - the ability to obtain additional collaborative arrangements;

     - the nature, size, timing or termination of our collaborative
       arrangements;

     - the costs involved in preparing, filing, prosecuting, maintaining and
       enforcing patent claims;

     - others may have or obtain patent rights that are superior to ours;

     - ability to find space for expansion of our operations;

     - changes in government regulation; and

     - competitors' release of successful products into the market.

     We have a long revenue cycle because the timing of collaboration agreements
cannot be controlled. We also have a high percentage of fixed costs such as
research and development. As a result, we may not always be able to adjust
expenditures timely if revenues decrease and 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.

  The Success of Our Business Depends on Patents and Other Proprietary
Information

     We currently have patents and patent applications covering our product
candidate and technology discoveries. We will continue to apply for patents for
our patentable discoveries. The United States government may not, however, issue
us additional patents and courts could find that our existing and future patents
are not valid or enforceable. Moreover, 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.

     The patent positions of biotechnology companies involve complex legal and
factual questions. There currently is a substantial backlog of biotechnology
patent applications at the United States Patent and Trademark Office. No
consistent legislative or other policy has yet emerged regarding the breadth of
claims covered in biotechnology patents, and proposals have been made for review
of the appropriateness of patents on genes and partial gene sequences.

     We seek patents on:

     - completely-sequenced genes;

     - partially-sequenced genes;

     - proteins produced by those genes and modifications thereof; and

     - processes, devices and other technology that enhance our ability to
       develop 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 high level of expenses and
invest a significant amount of time. Patent applications we may apply for with
respect to human

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therapeutics could require us to generate clinical 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. Even though we
require all employees to enter into confidentiality agreements with us:

     - competitors may independently develop substantially equivalent
       proprietary information and techniques;

     - competitors may otherwise gain access to our trade secrets or disclose
       such technology; or

     - we may be unable to protect our trade secrets meaningfully.

     We own patents protecting our sequencing by hybridization ("SBH")
technology in the United States, but not internationally. Therefore, we
currently are not able to prevent others from practicing SBH outside of the
United States. Although we intend to defend our patents, we may not prevail in a
court case against others who use the SBH technology outside of the United
States. We currently have two suits against, and are defending a countersuit and
suit against us by, our competitor Affymetrix, Inc. We have claimed that
Affymetrix has infringed our SBH patents and Affymetrix claims that our patents
are invalid. If we lose our exclusive rights to SBH technology because of the
litigation, then competitors could be free to design products with similar
competitive advantages. We have and will continue to incur substantial costs and
expend substantial personnel time in defending our patents rights in court. See
"Item 3. Legal Proceedings," for additional information.

     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 could
encounter delays in product market introductions and incur substantial costs
while we attempt to design around existing patents, or we could find that the
development, manufacture or sale of products requiring such licenses is
foreclosed. Any of these factors could significantly harm our business,
financial condition and operating results.

  Certain Litigation

     We have filed three suits against our competitor, Affymetrix Inc., alleging
infringement of certain of our patents. Affymetrix has filed a countersuit and a
suit of its own alleging that our patent is invalid and that we infringed
certain of Affymetrix's patents. We have and will continue to incur substantial
costs and expend substantial personnel time in asserting our patent rights
against Affymetrix, and in our defense in the suit brought by Affymetrix. We may
not be successful in asserting our patent rights or in our defense against
Affymetrix. Failure to enforce our patent rights successfully or the loss of
these patent rights covering our proprietary technologies also could remove a
legal obstacle to competitors in designing platforms with similar competitive
advantages, which could significantly harm our business, financial condition and
operating results. See "Item 3. Legal Proceedings," for additional information.

  We Face Uncertainties Related to Certain Technological Approaches

     We have developed the biochip component that will be used with the HyChip
system that is being developed by our collaboration partner, PE Corporation. As
the HyChip system undergoes further development, we may discover problems in the
functioning of the system and, with PE Corporation, we may be unable to improve
the HyChip products enough to be able to market them successfully. Further, the
HyChip products compete against other chip products and well-established
technologies. We cannot predict the outcome of these uncertainties.

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<PAGE>   19

  Management of Growth

     We expect to experience significant growth in 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 remain competitive or satisfy the
needs of current and future collaboration partners, we will be required to:

     - attract and train employees;

     - acquire additional equipment and supplies; and

     - expand our protein production capacity.

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.

  We Lack Manufacturing Experience and We Intend to Rely Initially on Contract
Manufacturers

     We do not currently have significant manufacturing facilities. Although we
currently manufacture limited quantities of proteins such as our proprietary
IL-1Hy1 and CD39L4 product candidates to conduct toxicology and other studies,
we intend to rely initially on third-party manufacturers to produce large
quantities of such substances for clinical trials and product commercialization.
Additionally, we may be required to rely on third-party manufacturers to produce
product candidates for research and development, preclinical studies and
clinical trials. Our product candidates have never been manufactured on a
commercial scale. Third-party manufacturers may not be able to be manufacture
such product candidates at a cost or in quantities necessary to make them
commercially viable. Third-party manufacturers may not be able to meet our needs
with respect to timing, quantity or quality of production. If we are unable to
contract for a sufficient supply of required products and substances on
acceptable terms, or if we encounter delays or difficulties in our relationships
with third-party contract manufacturers, our preclinical and clinical testing
would be delayed. Such delays could, in turn, delay the submission of products
for regulatory approval or the introduction and subsequent sales of such
products in the commercial market. Any such delay may significantly harm our
business, financial condition and results of operations.

     Moreover, contract manufacturers that we may use must continually adhere to
current Good Manufacturing Practice 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.

  Our Need for and Ability to Secure Additional Funding is Uncertain

     We will require substantial capital resources over time in order to conduct
our operations. Our future capital requirements and the adequacy of our
available funds will depend on many factors, including, among others, the
following:

     - continued scientific progress in our research and development programs;

     - our ability to attract additional financing on favorable terms;

     - the magnitude and scope of our research and development programs,
       including our development of biopharmaceutical product candidates and our
       complete gene sequencing programs;

     - our ability to maintain existing and establish additional collaborative
       and licensing arrangements, and the financial commitments involved in
       such collaborative and licensing arrangements;

     - the cost of prosecution and enforcement of our intellectual property
       rights;

     - expansion of our facilities to support research and development of our
       biopharmaceutical candidates;

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<PAGE>   20

     - progress with preclinical studies and clinical trials;

     - the time and cost involved in obtaining regulatory approvals;

     - competing technological and market developments;

     - our need to develop, acquire or license new technologies or products; and

     - other factors not within our control.

     We intend to seek additional funding through collaboration, public or
private equity or debt financings and capital lease transactions. Additional
financing, however, may not be available on acceptable terms, if at all.
Additional equity financings could result in significant dilution of
stockholders' equity interests. If sufficient capital is not available, we may
be required to delay, reduce the scope of, eliminate or divest one or more of
our discovery, research or development programs. Any such action could
significantly harm our business, financial condition and results of operations.
We anticipate that existing capital resources, anticipated cash from existing
collaborative partners and funds we receive under our capital financing
commitment will be sufficient to support our biopharmaceutical research and
development and other operations through the first half of 2001. Such funds,
however, may not be sufficient to meet our capital needs. In addition, a
substantial number of the payments to be made by our collaboration partners are
dependent upon our performance of certain research obligations. Failure to
perform as required could increase our future capital needs.

  We Face Potential Volatility of Our Stock Price

     Our common stock has been traded on the Nasdaq National Market only since
August 1997. The market price of our common stock may fluctuate substantially
because of a variety of factors, including:

     - quarterly fluctuations in our results of operations;

     - adverse circumstances affecting the introduction or market acceptance of
       new products we offer;

     - announcements by competitors;

     - developments in our litigation proceedings;

     - changes in our earnings estimates;

     - changes in accounting principles;

     - sales of our common stock by existing holders;

     - loss of key personnel; and

     - economic and other external factors.

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.

  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 technical expertise and
with supporting

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<PAGE>   21

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.

  FDA Regulatory Approval of Our Products is Uncertain; We Face Heavy Government
Regulation

     Products such as those proposed to be developed by us, alone, or in
conjunction with 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, alone, or in conjunction with 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 current Good Manufacturing
Practice requirements, as revised. The new Quality System Regulation imposes
design controls and makes other significant changes in the requirements
applicable to manufacturers. In the event we, alone, or in conjunction with our
collaboration partners, develop products classified as drugs, we and our
collaboration partners will be required to obtain additional approvals as well.

     If we sell our HyChip products for clinical diagnostics, we will need to
comply with Good Manufacturing Practices with respect to our HyChip system once
such products are available for commercial sale. We must also demonstrate that
an application for a Biological License Application, a Product License
Application, or an Establishment License Application for any biological products
would be approved by the applicable government agency. In addition, in order to
market our HyChip products as diagnostic products that may be considered to be
medical devices, we or our 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, we must demonstrate that we are capable
of manufacturing the product in accordance with the relevant standards. To
obtain FDA approval for such products, we 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 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;
                                       20
<PAGE>   22

     - 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 which 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, alone, or in conjunction
       with our collaboration partners, may attain; and

     - would adversely affect the marketing of our products.

  Some of Our Products May Not Be Accepted in the Marketplace

     Even if they are approved for marketing, some products we, alone, or in
conjunction with our collaboration partners, successfully 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 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 properly market genetic tests performed
with our technology. Genetic tests, including those performed using HyChip
products, 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
                                       21
<PAGE>   23

genetic testing may adversely effect market acceptance of our technology for
diagnostic applications. Impaired market acceptance of our technology could
significantly harm our business, financial condition and operating results.

     Some of the specific risks and difficulties we may encounter with respect
to GeneSolutions, our new e-commerce website, include:

     - We may be unable to attract or maintain a significant customer base;

     - We have not yet tested our business plan in the marketplace and it may
       not be successful;

     - We may be unable to establish relationships with potential customers;

     - We may be unable to generate significant sales revenues;

     - We may be unable to adapt to rapidly changing technologies and developing
       markets;

     - We may be unable to effectively manage our business if it expands
       rapidly;

     - We may be unable to attract, retain and motivate qualified personnel,
       particularly people who understand specialized genomics research and
       integration of bioinformatics with our products and our website;

     - We may be unable to compete in a highly competitive market dominated by
       larger, established companies with substantial financial resources and
       significant customer relationships; and

     - There will be a limited market for our products and, although we expect
       to continue to add to our catalogs, there are a finite number of genes;
       accordingly, to the extent we sell exclusive licenses a significant
       number of our catalog items will not be replenishable.

  We Are Dependent on Key Personnel

     The success of our business is highly dependent on the principal members of
our scientific and management staff. The loss of the services of such
individuals 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. We maintain limited key
person life insurance on certain of our officers.

  We Face Intense Competition

     The genomics and biopharmaceutical industries are intensely competitive.
Our strategy as a biopharmaceutical company has been 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
will be identified within the next few years by us and our competitors. 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 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

                                       22
<PAGE>   24

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 and our
collaboration partners 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.

Our competitors may develop more effective or more affordable products than we
develop. They may also achieve earlier patent protection or product
commercialization than we, alone, or in conjunction with our collaboration
partners, achieve. Such competitive products may render our products obsolete
and unmarketable.

     We currently generate our revenues primarily from gene discovery
collaborations. We believe that our ability to enter into additional gene
discovery collaborations is dependent, in part, upon our ability to continue to
improve our technology to permit more rapid identification of genes while
improving our bioinformatics capacity for analyzing gene sequences and
identifying the possible function of the genes sequenced. 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. Loss of our SBH patent
rights also could remove a legal obstacle to competitors in designing platforms
with similar competitive advantages. Competition in this field is expected to
intensify. Certain of our collaboration partners may now be, or could become,
competitors.

     In the area of chip products, we compete primarily with Affymetrix, Inc.
See "Item 3. Legal Proceedings" for a discussion of our litigation against
Affymetrix, Inc. Additionally, although we are collaborating with PE Corporation
to develop HyChip systems for commercial applications, PE Corporation presently
markets gel sequencers that are used by its affiliate, Celera, and other third
parties to compete with us in gene discovery and diagnostics. We believe that
our ability to compete in the chip arena will depend primarily upon our ability
to demonstrate that the HyChip system and our other biochip-based products can
provide higher levels of accuracy and a lower cost than other prevailing
technologies. Additionally, although we believe that the ability of the HyChip
system to accommodate new tests through software modifications will be
attractive to clinical reference laboratories, biochips such as those being
marketed by Affymetrix may be competitive for certain applications.

  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 10,
2000, we had 13,204,579 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. Our affiliates hold 1,821,948 shares of our common stock which are
transferable pursuant to Rule 144, subject to the volume limitations of Rule
144. Although such affiliates have no 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 are
expected to remain in a blocked account and will therefore not be voted or
transferable pursuant to restrictions imposed by the U.S. Department of
Treasury. There can be no assurance as to how long such restrictions will remain
in effect.

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<PAGE>   25

     As of March 10, 2000, warrants to purchase 350,652 shares of our common
stock were outstanding. In addition, under registration statements on Form S-8
under the Securities Act of 1933, as amended, we have reserved approximately
2,716,043 shares of our common stock for issuance 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.
Shares of our common stock acquired pursuant to these plans and agreements are
available for sale in the open market, except to the extent that such shares are
subject to vesting restrictions. Options or warrants generally have an exercise
price that is 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.

  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 (1) has not received appropriate
clearances from the FDA or other government regulators, (2) is not used in
accordance with cost-effective treatment methods as determined by the
third-party payor, or (3) is experimental, unnecessary or inappropriate. If
third-party payors routinely deny reimbursement, we may not be able to market
our products efficiently. 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 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, alone or in conjunction with 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, product recalls or other claim, 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.

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<PAGE>   26

  We Have Implemented Anti-Takeover Provisions that May Reduce the Market Price
  of Our Common Stock

     Our By-Laws, as amended, provide that members of our board of directors
serve staggered three-year terms. Our Amended and Restated Articles of
Incorporation, as amended, provide that all stockholder action must be effected
at a duly called meeting and not by a consent in writing. The By-Laws, as
amended, 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, as amended, and our By-Laws, as amended, 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.

     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 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
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, together with affiliates and associates, beneficially owns (or within the
prior three years, did beneficially own) 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 (1) our board
of directors approves the combination prior to the interested stockholder
becoming an interested stockholder or (2) 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;

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<PAGE>   27

     - discourage bids for our common stock at a premium over market price; and

     - generally deter efforts to obtain control of us.

  Risk of Natural Disaster

     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. Our landlords maintain
earthquake coverage for our facilities. Although we maintain personal property
and business interruption, we do not maintain earthquake coverage for personal
property or resulting business interruption.

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 $22,200 per month. We also lease
approximately 59,000 square feet of space at 675 Almanor Avenue, Sunnyvale,
California, which is across the street from 670 Almanor. Approximately 20,000
square feet remains available to accommodate expected increases in operations
and additional full-time employees. We began leasing approximately one-half of
the space (approximately 29,000 square feet) in December 1997 and leased the
remaining space (approximately 30,000 square feet) in July 1998. 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 of
approximately $92,000 per month. Although we have in-house capabilities for the
production and purification of proteins for use in our research activities, we
do not have manufacturing facilities capable of supplying materials suitable for
clinical trials or for commercial sale. We expect to rely on a third party for
the production of proteins for use in our early clinical work.

ITEM 3.  LEGAL PROCEEDINGS

     On March 3, 1997, the Company brought suit against Affymetrix, Inc. in the
U.S. District Court for the Northern District of California, San Jose Division,
alleging infringement by Affymetrix of the Company's U.S. Patent Nos. 5,202,231
and 5,525,464 (Hyseq, Inc. v. Affymetrix, Inc., Case No. C 97-20188 RMW (PVT))
("Hyseq I"). On May 5, 1997, the Company filed an Amended Complaint. On December
9, 1997, the Company filed a second lawsuit against Affymetrix alleging
infringement by Affymetrix of the Company's U.S. Patent No. 5,695,940 (Hyseq,
Inc. v. Affymetrix, Inc., Case No. C-97 4469 THE) ("Hyseq II"). On April 22,
1998 the two cases were consolidated before Judge Ronald M. Whyte.

     The consolidated suits allege that Affymetrix willfully infringed, and
continues to infringe, the Company's patents covering SBH technology. Through
the lawsuit, the Company seeks both to enjoin Affymetrix from infringing its
patents covering SBH technology and an award of monetary damages for Affymetrix'
past infringement. On May 19, 1997, Affymetrix filed an Answer and Affirmative
Defenses to the First Amended Complaint in Hyseq I and also filed a counterclaim
against the Company. The counterclaim seeks a declaratory judgment of invalidity
and non-infringement with respect to the two patents asserted in Hyseq I. On
September 9, 1997, the Company filed a reply to the counterclaim in which it
denied the allegations of invalidity and non-infringement. A similar answer and
counterclaim was filed by Affymetrix in Hyseq II on December 28, 1997, and a
similar reply to the counterclaim was filed by the Company on January 29, 1998.
On August 1, 1997 (Hyseq I), and on March 28, 1998 (Hyseq II), initial case
management conferences were held in each case in which the Court entered a
pre-trial schedule. The Court held a claims construction hearing on November 17
and 18, 1998 in Hyseq I and II. On July 12, 1999, Affymetrix filed an amended
answer and counterclaim alleging the additional defense that the patents were
obtained through inequitable conduct. On October 27, 1999, the Court issued an
order construing terms in the claims of the patents-in-suit and inviting the
parties to submit briefs setting forth any perceived errors or inconsistencies
in the Order. The Company and Affymetrix submitted their briefs on December 17
and 27, 1999, respectively. On January 7, 2000, the Court held a further Case
Management Conference. On February 22, 2000, the Court received oral argument
from the parties regarding the Claims Construction Order. The Company and
Affymetrix are

                                       26
<PAGE>   28

currently engaged in pretrial discovery during which documents and other written
discovery are being exchanged and depositions are being taken. While the Company
believes it has asserted valid claims and has meritorious defenses to the
counterclaims, this litigation is at an early stage and there can be no
assurance that the Company will prevail in these actions.

     On August 18, 1998, Affymetrix filed suit against the Company in the U.S.
District Court for the Northern District of California, San Francisco Division,
alleging that the Company infringed two of Affymetrix' U.S. patents, No.
5,795,716 and 5,744,305 (Affymetrix, Inc. v. Hyseq, Inc., Case No. C 98-13192).
Affymetrix filed an amended complaint on September 1, 1998 alleging infringement
of its U.S. Patent No. 5,800,992. The case has been was reassigned to Judge
Jeremy Fogel in the San Jose Division. At the time of the assignment to Judge
Fogel, the case was also renumbered as Case No. C 99-21163 JF (MEJ). A Case
Management Conference before Judge Fogel is scheduled for April 17, 2000. The
Company believes that Affymetrix' allegations are without merit and intends to
vigorously defend the action. However, the litigation is at a very early stage
and it is impossible to predict the ultimate outcome of this matter.

     On October 26, 1999, the Company filed a third lawsuit against Affymetrix
in the U.S. District Court for the Northern District of California, San
Francisco Division (Hyseq, Inc. v. Affymetrix, Inc., Case No. C-99 4735 MJJ)
("Hyseq III"), alleging infringement by Affymetrix of the Company's
recently-issued U.S. Patent No. 5,972,619 (the "'619 Patent"). Hyseq also
alleges that Affymetrix' U.S. Patent No. 5,795,716 is invalid because the
subject matter was first invented by Hyseq scientists and is claimed and covered
by Hyseq's '619 Patent. Affymetrix filed an answer and counterclaim on November
15, 1999. The counterclaim seeks a declaratory judgment of invalidity,
unenforceability and non-infringement with respect to Hyseq's '619 Patent. On
December 9, 1999, the Company filed a reply to the counterclaim in which it
denied the allegations of invalidity, unenforceability, and non-infringement.
Subsequently, Hyseq III was reassigned to Judge Fogel and was given Case No.
C-00-20050 JF/PVT. Hyseq III is presently scheduled for a Case Management
Conference on April 17, 2000 along with Affymetrix, Inc. v. Hyseq, Inc.

     On February 28, 2000, Judge Whyte issued an order directing each of the
parties involved in each of the above cases to submit statements regarding the
appropriateness of relating the cases before Judge Fogel with the Hyseq I and II
cases currently before Judge Whyte. The Company and Affymetrix submitted their
respective statements on March 10, 2000, as directed by the Court.

     The Company has incurred substantial costs and expended substantial
personnel time in asserting the Company's patent rights and defending its
technology against Affymetrix and may continue to incur such costs in asserting
its patent rights and defending its technology against Affymetrix or others.
There can be no assurance that the Company will be successful in these efforts.
Failure to successfully enforce its patent rights or the loss of these patent
rights covering SBH technology also could remove a legal obstacle to competitors
in designing platforms with similar competitive advantages.

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, 1999.

                                       27
<PAGE>   29

                                    PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

     The Company's 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 sales prices for the common stock,
as reported by the Nasdaq Stock Market, since the common stock commenced public
trading:

<TABLE>
<CAPTION>
                                                               HIGH      LOW
                                                              ------    ------
<S>                                                           <C>       <C>
FISCAL 1997:
  Third Quarter (from August 8, 1997).......................  $21.63    $13.00
  Fourth Quarter............................................  $20.13    $ 7.88

FISCAL 1998:
  First Quarter.............................................  $15.25    $ 7.88
  Second Quarter............................................  $15.25    $ 9.50
  Third Quarter.............................................  $11.88    $ 4.25
  Fourth Quarter............................................  $ 5.88    $ 4.00

FISCAL 1999:
  First Quarter.............................................  $ 5.19    $ 2.50
  Second Quarter............................................  $ 3.56    $ 2.56
  Third Quarter.............................................  $ 8.38    $ 2.75
  Fourth Quarter............................................  $20.00    $ 4.00
</TABLE>

     As of March 10, 2000, there were approximately 203 stockholders of record
of the common stock. The Company has not paid dividends to its stockholders'
since its inception and does not plan to pay cash dividends in the foreseeable
future. The Company currently intends to retain earnings, if any, to finance the
growth of the Company.

                                       28
<PAGE>   30

ITEM 6.  SELECTED CONSOLIDATED FINANCIAL DATA

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                  ------------------------------------------------
                                                   1995     1996      1997       1998       1999
                                                  ------   -------   -------   --------   --------
                                                      (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                               <C>      <C>       <C>       <C>        <C>
STATEMENTS OF OPERATIONS DATA:
Contract revenues...............................  $2,127   $   426   $ 6,199   $  9,590   $  6,397
Operating expenses:
  Research and development......................   1,811     3,736     9,430     19,207     18,157
  General and administrative....................     938     1,749     4,854      9,495      8,101
                                                  ------   -------   -------   --------   --------
     Total operating expenses...................   2,749     5,485    14,284     28,702     26,258
                                                  ------   -------   -------   --------   --------
Loss from operations............................    (622)   (5,059)   (8,085)   (19,112)   (19,861)
Interest income, net and other..................      21       220     1,548      2,743      1,314
                                                  ------   -------   -------   --------   --------
Net loss........................................  $ (601)  $(4,839)  $(6,537)  $(16,369)  $(18,547)
                                                  ======   =======   =======   ========   ========
Basic and diluted net loss per share............  $(0.08)  $ (0.91)  $ (0.86)  $  (1.27)  $  (1.43)
                                                  ======   =======   =======   ========   ========
Shares used in computing basic and diluted net
  loss per share................................   7,343     5,344     7,589     12,839     13,004
                                                  ======   =======   =======   ========   ========
</TABLE>

<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                              ------------------------------------------------------
                                               1995      1996         1997         1998       1999
                                              -------   -------   ------------   --------   --------
                                                                  (IN THOUSANDS)
<S>                                           <C>       <C>       <C>            <C>        <C>
BALANCE SHEET DATA:
Cash, cash equivalents, short-term
  investments and cash on deposit(1)........  $   750   $ 6,707     $ 59,240     $ 48,541   $ 32,743
Working capital.............................  $   331   $ 5,955     $ 56,824     $ 42,345   $ 22,077
Total assets................................  $ 2,740   $ 9,366     $ 66,950     $ 57,914   $ 45,364
Noncurrent portion of capital lease and loan
  obligations...............................  $    32   $   791     $    613     $  4,479   $  5,221
Accumulated deficit.........................  $(3,373)  $(8,212)    $(14,749)    $(31,122)  $(49,669)
Total stockholders' equity..................  $ 1,977   $ 7,364     $ 62,937     $ 47,576   $ 29,222
</TABLE>

- ---------------
(1) The 1997, 1998 and 1999 balances include $2.1 million of cash on deposit,
    which is restricted and cannot be withdrawn. The cash on deposit has been
    made in connection with a letter of credit. See Note 5 of Notes to
    Consolidated Financial Statements.

ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

     This Management's Discussion and Analysis of Financial Condition and
Results of Operations contains 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 herein. Actual results and performance could also differ
materially from time to time from those projected in our filings with the
Securities and Exchange Commission. The factors causing such differences may
include, but are not limited to, the following:

     - the amount of research and development we engage in with respect to our
       biopharmaceutical product candidates;

     - the ability to obtain additional collaborative arrangements;

     - the nature, size, timing or termination of our collaborative
       arrangements;

                                       29
<PAGE>   31

     - the costs involved in preparing, filing, prosecuting, maintaining and
       enforcing patent claims;

     - others may have or obtain patent rights that are superior to ours;

     - ability to find space for expansion of our operations;

     - changes in government regulation; and

     - competitors' release of successful products into the market.

RESULTS OF OPERATIONS

  Contract Revenues

     Comparison of Years Ended December 31, 1999 and 1998.  Our contract
revenues were $6.4 million for 1999, not including $5.0 million in deferred
revenue from American Cyanamid Company, a subsidiary of American Home Products
Corporation, received and recorded in December 1999, compared to $9.6 million
for 1998. The decrease of $3.2 million was due primarily to lower revenues
earned from our collaboration with Chiron Corporation during 1999. The primary
reason that revenues were higher in 1998 was that minimum production
requirements were higher under the Chiron agreement in 1998, and additionally
some of the scheduled requirements for the first half of 1999 were accelerated
into 1998. Decreased production requirements under the Chiron agreement during
the first half of 1999 allowed us to undertake a facilities expansion to
increase our production capacity in anticipation of a new collaboration.

     Our contract and other revenues earned during 1999 included $4.9 million
received from Chiron, $1.2 million received from the Pharmaceutical Division of
Kirin Brewery Co., Ltd. and $0.3 million received from PE Corporation. As of
December 31, 1999, $2.3 million remained to be earned over the term of the
Chiron agreement which ends May 31, 2000. Chiron has the right to extend the
agreement for up to two additional periods of two years each. As of December 31,
1999, we had received and recognized as revenue $2.7 million of the $3.0 million
contract amount under our collaboration agreement with Kirin. The balance is
expected to be earned during 2000. Revenues recognized from PE Corporation
represent a combination of reimbursement for HyChip system development costs and
initial fees earned under a new agreement that expanded our relationship with PE
Corporation. Under the terms of this expanded relationship, we may earn up to an
additional $1.2 million in revenue during 2000.

     In December 1999, we received an upfront payment of $5.0 million in our
collaboration with American Cyanamid which was classified as deferred revenue.
Subject to compliance with the terms of the contract, we expect to recognize
revenue from this collaboration over the term of the agreement. A certain
portion of the deferred revenue will be accounted for as reimbursement of set-up
costs related to initial deliverables.

     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, 1998 and 1997.  Our contract and
other revenues increased by $3.4 million to $9.6 million in 1998 compared to
$6.2 million for 1997. Contract and other revenues recognized in 1998 included
$8.1 million from Chiron and $1.5 million from Kirin. Contract and other
revenues we earned during 1997 included $5.3 million from Chiron and $0.9
million we received in conjunction with our National Institute of Standards and
Technology ("NIST") grant. As of December 31, 1997, we had received all of the
funding under our NIST grant and we have not applied for any additional NIST
grants or other government sponsored programs. Although we may apply for other
grants in the future, we may not receive such grants or such grants, if
received, may not provide us with significant funds.

                                       30
<PAGE>   32

  Operating Expenses

     Comparison of Years Ended December 31, 1999 and 1998.  Our total operating
expenses, consisting of research and development expenses and general and
administrative expenses, decreased by $2.4 million to $26.3 million for 1999
compared to $28.7 million for 1998.

     For 1999, our research and development expenses decreased by $1.0 million
to $18.2 million compared to $19.2 million for 1998. Our lower 1999 research and
development expenses reflect primarily lower material consumption costs
resulting from decreased production during our facilities expansion in 1999 and
the capitalization of internally-developed software costs, partially offset by:

     - higher salary expenses;

     - increased depreciation and rental expenses associated with the expansion
       of our facilities; and

     - increased expenditures related to prosecuting and enforcing our
       intellectual property rights.

     For 1999, our general and administrative expenses decreased by $1.4 million
to $8.1 million compared to $9.5 million in 1998. The decrease in general and
administrative expenses during 1999 resulted primarily from lower legal expenses
during this period. Legal expenses decreased, in part, due to delayed activity
in our litigation with Affymetrix, Inc. while awaiting the results of the
November 1998 claims construction hearing that the Court released in October
1999. The decrease in general and administrative expenses was partially offset
by increased staffing costs and other costs associated with business
development.

     We expect operating expenses during 2000 to increase as we plan to
significantly expand:

     - research and development of our biopharmaceutical product candidates;

     - complete gene sequencing programs;

     - development and production of our HyChip biochip; and

     - efforts related to prosecuting and enforcing our intellectual property
       rights, including increasing expenses as our patent litigation with
       Affymetrix nears the trial stage.

     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, we may be required to delay or
eliminate one or more of our research or development programs. Any such action
could significantly harm our business, financial condition and results of
operations.

     Comparison of Years Ended December 31, 1998 and 1997.  Our total operating
expenses, consisting of research and development expenses and general and
administrative expenses, increased by $14.4 million to $28.7 million in 1998
compared to $14.3 million for 1997. Increases in our total operating expenses in
1998 as compared to 1997 resulted primarily from:

     - further expansion of our scientific and management personnel;

     - ongoing software and database development;

     - costs associated with our collaboration arrangements, including the
       associated scale-up of our gene discovery capacity;

     - increased depreciation and rental expenses associated with expansion of
       our facilities; and

     - increased expenditures related to prosecuting and enforcing our
       intellectual property rights.

                                       31
<PAGE>   33

     Research and development expenses increased by $9.8 million to $19.2
million for 1998 compared to $9.4 million for 1997. Increases in 1998 as
compared to 1997 resulted primarily from the addition of scientific personnel.
The remaining portion of the increase was due to:

     - increased sequencing production in connection with gene discovery;

     - expression of gene-based product candidates;

     - the research discovery collaboration with Chiron Corporation;

     - expenses associated with the University of California, San Francisco
       collaboration; and

     - further development of the HyChip system, including related costs
       associated with expansion of our facilities.

     General and administrative expenses increased by $4.6 million to $9.5
million in 1998 compared to $4.9 million in 1997. This increase was due, in
significant part, to:

     - an increase in legal expenses resulting primarily from costs associated
       with our lawsuits against Affymetrix and the Affymetrix lawsuit filed
       against us;

     - the addition of management personnel and administrative staff to support
       the continued expansion of our sequencing production and data analysis
       capabilities; and

     - costs associated with being a public company.

  Interest Income, Net

     Comparison of Years Ended December 31, 1999 and 1998.  Our net interest
income decreased by $1.4 million to $1.3 million for 1999 compared to $2.7
million for 1998. This decrease in net interest income during 1999 resulted from
lower cash and investment balances held by us and higher interest expense from
our increased financing activities.

     Comparison of Years Ended December 31, 1998 and 1997.  Our net interest
income increased by $1.2 million to $2.7 million in 1998 compared to $1.5
million in 1997. The increase in net interest income in 1998 as compared to 1997
resulted from our larger cash and investment balances derived from the $17.5
million net proceeds from our private placements in May and August 1997 and the
$44.0 million net proceeds from our initial public offering in August 1997. This
increase in interest income was partially offset by increased interest expense
related to our various capital financings.

  Net Loss

     Since our inception, we have incurred operating losses, and as of December
31, 1999, we had an accumulated deficit of $49.7 million. During 1999, we
incurred a net loss of $18.5 million as compared to a $16.4 million net loss in
1998 and a net loss of $6.5 million in 1997. We expect to continue to incur
significant operating losses, which may increase substantially as we pursue
research and development of our biopharmaceutical product candidates and other
operations, and as we prosecute and enforce our intellectual property rights.

     As of December 31, 1999, we had a net operating loss carryover for federal
income tax purposes of approximately $47.0 million. If we do not utilize this
loss carryover, portions of it will expire on various dates from 2008 through
2019. Utilization of the net operating loss carryover may be subject to an
annual limitation imposed by "change in ownership" provisions of the Internal
Revenue Code of 1986, as amended. The annual limitation may result in the
expiration of net operating losses before utilization. See Note 8 of Notes to
Consolidated Financial Statements.

                                       32
<PAGE>   34

LIQUIDITY AND CAPITAL RESOURCES.

  Cash, Cash Equivalents, Short-Term Investments, and Cash on Deposit

     Comparison of Years Ended December 31, 1999 and 1998.  As of December 31,
1999, we had $32.7 million in cash and investments, including $30.6 million in
cash, cash equivalents and short-term investments and $2.1 million in a
restricted cash on deposit account. These amounts reflect a net decrease of
$15.8 million from the $48.5 million in cash and investments we had as of
December 31, 1998. This decrease resulted primarily from $13.0 million of net
cash used in operating activities.

     All of our investments in marketable securities are considered
available-for-sale and as such are classified as short-term investments. We
currently hold 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.

     In addition, we have $2.1 million in restricted cash on deposit as security
for a $2.0 million letter of credit in conjunction with a facility lease.
Provided that no event of default under the lease has occurred, the letter of
credit and the cash collateralizing it will be reduced by $0.5 million per year
commencing in 2001. 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.

  Cash Used in Operating Activities

     Comparison of Years Ended December 31, 1999 and 1998.  The amount of net
cash used in operating activities increased by $1.3 million to $13.0 million
during 1999 from $11.7 million in 1998. The increase in cash used for operations
for 1999 compared to 1998 was due primarily to:

     - a significant increase in our accounts receivables balance;

     - our complete gene sequencing programs;

     - expansion of our functional genomics and protein purification efforts to
       support research and development of our biopharmaceutical product
       candidates; and

     - efforts related to prosecuting our intellectual property rights.

     This increase in cash used in operations for 1999 was partially offset by
lower spending related to enforcing our intellectual property rights.

     Comparison of Years Ended December 31, 1998 and 1997.  In 1998, the total
amount of net cash used in operating activities increased by $3.6 million to
$11.7 million from $8.1 million in 1997. The increase in cash used in 1998
resulted primarily from:

     - increases in our personnel to support gene discovery, database
       development programs, functional genomics, corporate development and
       marketing;

     - general corporate matters;

     - efforts related to prosecuting and enforcing our intellectual property
       rights; and

     - costs related to our new facility.

  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, 1999 and 1998.  Net cash provided by
investing activities decreased by $1.0 million to $3.5 million for 1999 compared
to $4.5 million for 1998. Our capital expenditures slightly decreased in 1999
primarily due to lower expenditures related to the facilities expansion compared
to 1998. In addition, our net redemptions of short-term investments were lower
in 1999 than in 1998.

                                       33
<PAGE>   35

     Comparison of Years Ended December 31, 1998 and 1997.  For 1998, net cash
provided by investing activities decreased by $32.6 million to $4.5 million
compared to $37.1 million used in investing activities for 1997. The difference
was due primarily to an infusion of cash to purchase short-term investments
following our IPO in 1997.

  Cash Provided by Financing Activities

     Comparison of Years Ended December 31, 1999 and 1998.  Net cash provided by
financing activities decreased by $4.0 million to $1.6 million for 1999 compared
to $5.6 million for 1998. The net cash provided in 1999 was primarily derived
from $3.0 million of proceeds we received from asset-backed financing. The
financing was partially offset by higher payments on loan obligations. In 1998,
the net cash provided by financing activities resulted primarily from our $5.0
million asset-backed financing, as well as receipts of payments on notes held by
certain of our stockholders and issuance of common stock related to the exercise
of options and warrants.

     During 1999, we obtained a $5.0 million asset-backed financing commitment.
As of December 31, 1999, we had borrowed $3.0 million. This commitment has been
extended through June 30, 2000. We are currently evaluating our future needs for
equipment financing and may seek to obtain additional equipment financing. There
is no assurance that in the future we will be able to secure new equipment
financing on favorable terms, if at all.

     Comparison of Years Ended December 31, 1998 and 1997.  Net cash generated
by financing activities in 1998 decreased by $56.0 million to $5.6 million
compared to $61.6 million for 1997. The total amount of net cash provided by
financing activities in 1998 reflects asset-backed financing, as well as
payments received on notes held by certain of our stockholders and the issuance
of common stock related to the exercise of options and warrants. Net cash
provided by financing activities in 1997 reflects primarily the $44.0 million in
net proceeds we received from our initial public offering and $17.5 million from
our private placements with Chiron Corporation and PE Corporation.

     We have financed our operations since inception through private and public
sales of our stock, revenue from research and development collaborations,
grants, asset-backed financings and investment income. We anticipate that
existing capital resources, anticipated cash from existing collaborative
partners and funds we receive under our capital financing commitment will be
sufficient to support our biopharmaceutical research and development and other
operations through the first half of 2001. Our estimate of the time period for
which existing and anticipated cash funds will be adequate to fund our
operations is a forward-looking estimate subject to risks and uncertainty.
Actual results may differ substantially. Our future capital requirements and the
adequacy of our available funds will depend on many factors, including, but not
limited to:

     - continued scientific progress in our research and development programs;

     - our ability to attract additional financing on favorable terms;

     - the magnitude and scope of our research and development programs,
       including our development of biopharmaceutical product candidates and our
       complete gene sequencing programs;

     - our ability to maintain existing and establish additional collaborative
       and licensing arrangements, and the financial commitments involved in
       such collaborative and licensing arrangements;

     - the cost of prosecution and enforcement of our intellectual property
       rights;

     - expansion of our facilities to support research and development of our
       biopharmaceutical candidates;

     - progress with preclinical studies and clinical trials;

     - the time and cost involved in obtaining regulatory approvals;

     - competing technological and market developments;

     - our need to develop, acquire or license new technologies or products; and

     - other factors not within our control.

                                       34
<PAGE>   36

  Year 2000 Compliance

     In late 1999, we completed Year 2000 ("Y2K") testing of third party
software and hardware used in our production line. We did not experience any
significant disruptions in our information technology and other systems related
to Y2K and we are not aware of any vendors or collaborators who experienced Y2K
problems that have or are likely to materially affect us. For the year ended
December 31, 1999, we incurred less than $50,000 in costs related to preparing
for Y2K contingencies.

ITEM 7A.  QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISK

  Market Rate Risk

     The Company's exposure to market rate risk for changes in interest rates
relates primarily to the Company's investment portfolio. The Company does not
use derivative financial instruments in its investment portfolio. The Company
places its investments with high quality issuers and, by policy, limits the
amount of credit exposure to any one issuee. The Company is averse to principal
loss and ensures the safety and preservation of its invested funds by limiting
default, market and reinvestment risk. The Company classifies its cash
equivalents and marketable securities as fixed-rate if the rate of return on
such instruments remains fixed over their term. These fixed-rate investments
include U.S. government securities, commercial paper, corporate bonds,
certificates of deposit, and all such investments held in the Company's
portfolio as of December 31, 1999 mature in 2000. The Company classifies its
cash equivalents and marketable securities as variable-rate if the rate of
return on such investments varies based on the change in a predetermined index
or set of indices during their term. These variable-rate investments primarily
include money market accounts. The table below presents the amounts and related
weighted-average interest rates of the Company's investment portfolio as of
December 31, 1999:

<TABLE>
<CAPTION>
                                                          AVERAGE
                                                         INTEREST     CARRYING      ESTIMATED
                                                           RATE        AMOUNT      FAIR VALUE
                                                         ---------    ---------    -----------
                                                         (IN THOUSANDS, EXCEPT INTEREST RATES)
<S>                                                      <C>          <C>          <C>
Cash and cash equivalents equivalents:
  Variable rate........................................      4.82%     $11,683       $11,683
  Fixed rate...........................................      5.97%       1,992         1,992
Short-term investments:
  Fixed rate...........................................      5.61%      16,994        16,962
                                                                       -------       -------
                                                                       $30,669       $30,637
                                                                       =======       =======
</TABLE>

                                       35
<PAGE>   37

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders
Hyseq, Inc.

     We have audited the accompanying consolidated balance sheets of Hyseq, Inc.
as of December 31, 1999 and 1998, and the related consolidated statements of
operations, stockholders' equity and cash flows for each of the three years in
the period 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 audits.

     We conducted our audits 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 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. at
December 31, 1999 and 1998, and the consolidated results of its operations and
its cash flows for each of the three years in the period 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

                                       36
<PAGE>   38

                                  HYSEQ, INC.
                          CONSOLIDATED BALANCE SHEETS
             (In thousands, except share and per share information)

<TABLE>
<CAPTION>
                                                              DECEMBER 31,    DECEMBER 31,
                                                                  1999            1998
                                                              ------------    ------------
<S>                                                           <C>             <C>
ASSETS
Cash and cash equivalents...................................    $ 13,675        $ 21,555
Short-term investments......................................      16,962          24,880
Accounts receivable.........................................       1,250             651
Other current assets........................................       1,111           1,118
                                                                --------        --------
     Total current assets...................................      32,998          48,204
Cash on deposit.............................................       2,106           2,106
Equipment, leasehold improvements and capitalized Software,
  net.......................................................       8,427           6,902
Patents, licenses and other assets, net.....................       1,833             702
                                                                --------        --------
          Total assets......................................    $ 45,364        $ 57,914
                                                                ========        ========

LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable............................................    $  1,473        $  1,905
Accrued professional fees...................................       1,778           1,575
Other current liabilities...................................         580           1,025
Deferred revenue............................................       5,000
Current portion of capital lease and loan obligations.......       2,090           1,354
                                                                --------        --------
     Total current liabilities..............................      10,921           5,859
Noncurrent portion of capital lease and loan obligations....       5,221           4,479
                                                                --------        --------
          Total liabilities.................................      16,142          10,338
                                                                --------        --------
Commitments and contingencies...............................          --              --
Stockholders' equity:
Preferred stock, par value $0.001; 8,000,000 shares
  authorized; none issued and outstanding as of December 31,
  1999 and 1998.............................................          --              --
Common stock, par value $0.001; 50,000,000 shares
  authorized; 13,083,242 and 12,930,589 issued and
  outstanding as of December 31, 1999 and 1998,
  respectively..............................................      82,463          82,341
Notes receivable from stockholders..........................      (3,503)         (3,503)
Deferred stock compensation.................................         (37)           (126)
Accumulated other comprehensive loss........................         (32)            (14)
Accumulated deficit.........................................     (49,669)        (31,122)
                                                                --------        --------
     Total stockholders' equity.............................      29,222          47,576
                                                                --------        --------
          Total liabilities and stockholders' equity........    $ 45,364        $ 57,914
                                                                ========        ========
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.
                                       37
<PAGE>   39

                                  HYSEQ, INC.
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                              -------------------------------
                                                                1999        1998       1997
                                                              --------    --------    -------
<S>                                                           <C>         <C>         <C>
Contract revenues...........................................  $  6,397    $  9,590    $ 6,199
Operating expenses:
  Research and development..................................    18,157      19,207      9,430
  General and administrative................................     8,101       9,495      4,854
                                                              --------    --------    -------
     Total operating expenses...............................    26,258      28,702     14,284
                                                              --------    --------    -------
Loss from operations........................................   (19,861)    (19,112)    (8,085)
Interest income and other income............................     2,004       2,919      1,706
Interest expense............................................      (690)       (176)      (158)
                                                              --------    --------    -------
Net loss....................................................  $(18,547)   $(16,369)   $(6,537)
                                                              ========    ========    =======
Basic and diluted net loss per share........................  $  (1.43)   $  (1.27)   $ (0.86)
                                                              ========    ========    =======
Shares used in computing basic and diluted net loss per
  share.....................................................    13,004      12,839      7,589
                                                              ========    ========    =======
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.
                                       38
<PAGE>   40

                                  HYSEQ, INC.
                 CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
              For the Years Ended December 31, 1999, 1998 and 1997
                                 (In thousands)
<TABLE>
<CAPTION>
                                      PREFERRED STOCK      COMMON STOCK      NOTES RECEIVABLE
                                     -----------------   ----------------          FROM            DEFERRED      ACCUMULATED OTHER
                                     SHARES    AMOUNT    SHARES   AMOUNT       STOCKHOLDERS      COMPENSATION    COMPREHENSIVE LOSS
                                     ------   --------   ------   -------    ----------------    ------------    ------------------
<S>                                  <C>      <C>        <C>      <C>        <C>                 <C>             <C>
BALANCE AT DECEMBER 31, 1996.......   2,170   $ 14,780    4,473   $ 2,033        $(1,237)           $                   $ --
Issuance of common stock for
  services and equipment...........                          79       514           (398)
Forfeiture of note receivable from
  stockholders.....................                         (86)      (68)            68
Purchase of common stock by Hyseq
  One Trust........................                          86        --             --
Issuance of common stock to certain
  officers of the Company..........                         359     2,340         (2,340)
Deferred compensation..............                          --       695                            (695)
Amortization of deferred
  compensation.....................                          --        --                             250
Issuance of common stock upon
  exercise of stock option
  grants...........................                          21        33
Issuance of common stock upon
  cashless exercise of warrants....                         241        --
Issuance of Series B preferred
  stock............................     350     10,000       --        --
Issuance of common stock in
  connection with public offering,
  net..............................                       3,450    43,970
Issuance of common stock in a
  private placement................                         555     7,500
Conversion of preferred to common
  at the initial public offering...  (2,520)   (24,780)   4,961    24,780
Repurchase of common stock from the
  Hyseq One Trust..................                      (1,405)       (2)
Cash payments of note receivable
  from stockholders................                          --        --            249
Net unrealized gain (loss) on
  short-term investments...........                          --        --                                                 (6)
Net loss...........................                          --        --
                                     ------   --------   ------   -------        -------            -----               ----
BALANCE AT DECEMBER 31, 1997.......      --         --   12,734    81,795         (3,658)            (445)                (6)
Cash payments of note receivable
  from stockholders................                                                  155
Issuance of common stock upon
  exercise of stock option
  grants...........................                          24        46
Issuance of common stock upon
  cashless exercise of warrants....                         173       500
Amortization of deferred
  compensation.....................                                                                   319
Net unrealized gain (loss) on
  short-term investments...........                                                                                       (8)
Cost to repurchase stock for
  ESPP.............................
Net loss...........................
                                     ------   --------   ------   -------        -------            -----               ----
BALANCE AT DECEMBER 31, 1998.......      --         --   12,931   $82,341         (3,503)            (126)               (14)
Issuance of common stock upon
  exercise of stock options and
  under ESPP.......................                         152       122
Amortization of deferred
  compensation.....................                                                                    89
Net unrealized gain (loss) on
  short-term investments...........                                                                                      (18)
Net loss...........................
                                     ------   --------   ------   -------        -------            -----               ----
BALANCE AT DECEMBER 31, 1999.......      --   $     --   13,083   $82,463        $(3,503)           $ (37)              $(32)
                                     ======   ========   ======   =======        =======            =====               ====

<CAPTION>
                                                       TOTAL
                                     ACCUMULATED    STOCKHOLDERS
                                       DEFICIT         EQUITY
                                     -----------    ------------
<S>                                  <C>            <C>
BALANCE AT DECEMBER 31, 1996.......   $ (8,212)       $  7,364
Issuance of common stock for
  services and equipment...........                        116
Forfeiture of note receivable from
  stockholders.....................                         --
Purchase of common stock by Hyseq
  One Trust........................                         --
Issuance of common stock to certain
  officers of the Company..........                         --
Deferred compensation..............                         --
Amortization of deferred
  compensation.....................                        250
Issuance of common stock upon
  exercise of stock option
  grants...........................                         33
Issuance of common stock upon
  cashless exercise of warrants....                         --
Issuance of Series B preferred
  stock............................                     10,000
Issuance of common stock in
  connection with public offering,
  net..............................                     43,970
Issuance of common stock in a
  private placement................                      7,500
Conversion of preferred to common
  at the initial public offering...                         --
Repurchase of common stock from the
  Hyseq One Trust..................                         (2)
Cash payments of note receivable
  from stockholders................                        249
Net unrealized gain (loss) on
  short-term investments...........                         (6)
Net loss...........................     (6,537)         (6,537)
                                      --------        --------
BALANCE AT DECEMBER 31, 1997.......    (14,749)         62,937
Cash payments of note receivable
  from stockholders................                        155
Issuance of common stock upon
  exercise of stock option
  grants...........................                         46
Issuance of common stock upon
  cashless exercise of warrants....                        500
Amortization of deferred
  compensation.....................                        319
Net unrealized gain (loss) on
  short-term investments...........                         (8)
Cost to repurchase stock for
  ESPP.............................         (4)             (4)
Net loss...........................    (16,369)        (16,369)
                                      --------        --------
BALANCE AT DECEMBER 31, 1998.......    (31,122)         47,576
Issuance of common stock upon
  exercise of stock options and
  under ESPP.......................                        122
Amortization of deferred
  compensation.....................                         89
Net unrealized gain (loss) on
  short-term investments...........                        (18)
Net loss...........................    (18,547)        (18,547)
                                      --------        --------
BALANCE AT DECEMBER 31, 1999.......   $(49,669)       $ 29,222
                                      ========        ========
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.

                                       39
<PAGE>   41

                                  HYSEQ, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                              -------------------------------
                                                                1999        1998       1997
                                                              --------    --------    -------
<S>                                                           <C>         <C>         <C>
Cash flows from operating activities:
Net loss....................................................  $(18,547)   $(16,369)   $(6,537)
Adjustments to reconcile net loss to net cash used in
  operating activities:
  Depreciation..............................................     2,849       1,626        823
  Amortization of patents and licenses......................        27          65        103
  Amortization of deferred stock compensation...............        89         319        250
  Common shares issued for services and equipment...........        --          --        116
  Unrealized loss on short-term investments.................       (18)         (8)        (6)
  Changes in operating assets and liabilities:
     Accounts receivable....................................      (599)      1,535     (2,039)
     Other current assets...................................         7        (214)      (592)
     Intangible and other assets............................    (1,158)        (94)    (2,320)
     Deferred revenue.......................................     5,000          --         --
     Accounts payable.......................................      (432)        334        999
     Accrued professional fees..............................       203         991        495
     Other current liabilities..............................      (445)        118        622
                                                              --------    --------    -------
          NET CASH USED IN OPERATING ACTIVITIES.............   (13,024)    (11,697)    (8,086)
                                                              --------    --------    -------
Cash flows from investing activities:
  Purchases of property and equipment.......................    (4,374)     (4,581)    (3,131)
  Purchases of short-term investments.......................   (16,382)    (44,511)   (38,930)
  Maturities of short-term investments......................    24,300      53,561      5,000
                                                              --------    --------    -------
          NET CASH PROVIDED BY (USED IN) INVESTING
            ACTIVITIES......................................     3,544       4,469    (37,061)
                                                              --------    --------    -------
Cash flows from financing activities:
  Proceeds from sale leaseback and financing arrangements...     3,001       5,324        181
  Payment on capital lease and loan obligations.............    (1,523)       (442)      (286)
  Repurchases of common stock...............................      (115)         (4)        (2)
  Payment of stockholder notes receivable...................        --         155        249
  Proceeds from issuance of common stock, net of issuance
     costs..................................................       237         546     51,502
  Proceeds from issuance of preferred stock, net of issuance
     costs..................................................        --          --     10,000
                                                              --------    --------    -------
          NET CASH PROVIDED BY FINANCING ACTIVITIES.........     1,600       5,579     61,644
                                                              --------    --------    -------
Net (decrease) increase in cash.............................    (7,880)     (1,649)    16,497
Cash and cash equivalents at beginning of period............    21,555      23,204      6,707
                                                              --------    --------    -------
Cash and cash equivalents at end of period..................  $ 13,675    $ 21,555    $23,204
                                                              ========    ========    =======
Supplemental disclosures of cash flow information:
  Interest paid.............................................  $    690    $    176    $   158
                                                              ========    ========    =======
  Noncash investing and financing activities:
     Cashless exercise of stock options.....................  $     --    $     74    $    --
                                                              ========    ========    =======
     Cashless exercise of warrant...........................  $    206    $     --    $ 1,133
                                                              ========    ========    =======
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.
                                       40
<PAGE>   42

                                  HYSEQ, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  Organization and Basis of Presentation

     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. The Company's wholly-owned subsidiary, Hyseq Diagnostics,
Inc. ("HDI"), was formed as a Nevada corporation on July 18, 1995. The Company's
wholly-owned subsidiary, GeneSolutions Inc., was formed as a Nevada corporation
on July 23, 1999.

     Hyseq researches and develops biopharmaceuticals. Hyseq uses its
proprietary technology with its partners for therapeutic and diagnostic target
discovery, in pharmacogenomics and polymorphism analysis, and with its DNA
analysis tools such as the HyChip system.

  Principles of Consolidation and Basis of Presentation

     The consolidated financial statements include the accounts of the Company's
wholly-owned subsidiaries. All significant intercompany transactions and
accounts have been eliminated.

  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, Cash Equivalents and Short-Term Investments

     The Company considers all highly liquid investments with original
maturities of less than 90 days and insignificant interest rate risk to be cash
equivalents. Investments with maturities of less than one year from the balance
sheet date and with original maturities greater than 90 days are considered
short-term investments. Investments consist primarily of money market accounts,
commercial paper, certificates of deposit and other short-term instruments.
These investments typically bear minimal risk. This minimization of risk is
consistent with the Company's policy to maintain high liquidity and ensure
safety of principal.

     The Company's short-term investments are classified as available-for-sale.
Available-for-sale securities are carried at fair value based on quoted market
prices, with the unrealized gains and losses, net of tax, included in
accumulated other comprehensive loss of stockholders' equity. The amortized cost
of debt securities in this category is adjusted for amortization of premiums and
accretion of discounts to maturity. Such amortization is included in interest
income. Realized gains and losses and declines in value judged to be
other-than-temporary on available-for-sale securities are included in interest
income or expense. Interest and dividends on securities classified as
available-for-sale are included in interest income. The cost of securities sold
is based on the specific identification method.

                                       41
<PAGE>   43
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The following is a summary of available-for-sale securities as of December
31, 1999 (in thousands):

<TABLE>
<CAPTION>
                                                                DECEMBER 31, 1999
                                                              ----------------------
                                                              CARRYING    ESTIMATED
                                                               AMOUNT     FAIR VALUE
                                                              --------    ----------
<S>                                                           <C>         <C>
Money market funds..........................................  $ 2,292      $ 2,292
Commercial paper............................................    7,468        7,466
Certificates of deposit.....................................    7,500        7,481
Corporate bonds.............................................    4,017        4,006
                                                              -------      -------
                                                              $21,277      $21,245
                                                              =======      =======
Included in cash and cash equivalents.......................  $ 4,284      $ 4,283
Short-term investments (available for sale).................   16,993       16,962
                                                              -------      -------
                                                              $21,277      $21,245
                                                              =======      =======
</TABLE>

     All of the Company's short-term investments mature within one year.

  Equipment and Leasehold Improvements

     Equipment and leasehold improvements are stated at cost. Depreciation and
amortization are computed using the straight-line method over the estimated
useful lives ranging from three to five years, except that leasehold
improvements are amortized over the remaining life of the lease or the life of
the improvement, whichever is less.

     Effective January 1, 1999, the Company adopted Statement of Position 98-1
("SOP 98-1"), "Accounting for the Costs of Computer Software Developed for or
Obtained for Internal Use". SOP 98-1 requires the capitalization of costs
incurred in developing or acquiring software for internal use once feasibility
studies are complete. The Company previously expensed such costs as incurred.
The adoption of SOP 98-1 resulted in the capitalization of approximately $1.5
million in 1999. The Company generally amortizes software capitalized under SOP
98-1 on a straight-line basis over a three-year period. In 1999, the Company
recorded an amortization expense of $0.2 million.

  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 reimbursable services
are performed. Nonrefundable up-front payments received in connection with
collaborative research agreements are deferred and recognized over the relevant
periods specified in the agreement, generally the research term.

     In December 1999, we received an upfront payment of $5.0 million in our
collaboration with American Cyanamid which was classified as deferred revenue.
Subject to compliance with the terms of the contract, we expect to recognize
revenue from this collaboration over the term of the agreement. A certain
portion of the deferred revenue will be accounted for as reimbursement of set-up
costs related to initial deliverables.

     The Company received research payments under its collaborative agreements
with Chiron and Kirin, which were recognized as revenue as earned.

                                       42
<PAGE>   44
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Revenues from collaborative agreements representing 10% or more of total
revenue are as follows:

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                              -----------------------
                                                              1999     1998     1997
                                                              -----    -----    -----
<S>                                                           <C>      <C>      <C>
Source:
  Chiron....................................................   76%      84%      85%
  Kirin.....................................................   19%      16%      --%
  NIST Grant................................................   --%      --%      14%
</TABLE>

  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 compensation under the
provisions of Accounting Principles Board Opinion No. 25, "Accounting for Stock
Issued to Employees" ("APB No. 25"), and to adopt the "disclosure only"
alternative described in SFAS No. 123.

  Research and Development

     Research and development costs are expensed to operations as incurred and
include costs related to the Company's NIST grant in 1997. In 1999, 1998 and
1997, research and development costs also included costs related to the
Company's collaborations. Contract and grant related costs of approximately $7.0
million, $10.7 million, and $4.7 million were recorded in 1999, 1998 and 1997,
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.

     Had the Company been in a net income position, shares used in calculating
diluted earnings per share for 1999, 1998, and 1997 would have included the
effect of an additional 369,000, 728,000 and 963,000 shares, respectively,
related to outstanding options and warrants (as determined using the treasury
method).

  Accumulated Other Comprehensive Loss

     Accumulated other comprehensive loss consists entirely of unrealized losses
on short-term investments at December 31, 1999.

  Recent Accounting Pronouncements

     In June 1999, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards No. 137 ("SFAS 137"), "Accounting
for Derivative Instruments and Hedging Activities -- Deferral of the Effective
Date of FASB Statement No. 133." SFAS 133 establishes new standards of
accounting and reporting for derivative instruments and hedging activities, and
SFAS 137 defers its effective date to the first quarter of the first fiscal year
after June 15, 2000. The Company will adopt SFAS 133 effective January 1, 2001.
Because the Company does not use derivative financial instruments or engage in
hedging activities, management does not anticipate that the adoption of SFAS 133
will have a significant effect on the Company's consolidated results of
operations or financial position.

                                       43
<PAGE>   45
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

2.  EQUIPMENT, LEASEHOLD IMPROVEMENTS AND CAPITALIZED SOFTWARE

     Equipment, leasehold improvements and capitalized software, net consist of
the following (in thousands):

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              ------------------
                                                               1999       1998
                                                              -------    -------
<S>                                                           <C>        <C>
Machinery, equipment and furniture..........................  $ 6,336    $ 5,077
Computers and capitalized software..........................    4,991      2,762
Leasehold improvements......................................    2,901      2,015
                                                              -------    -------
                                                               14,228      9,854
Less: accumulated depreciation..............................   (5,801)    (2,952)
Equipment, leasehold improvements and capitalized software,
  net.......................................................  $ 8,427    $ 6,902
                                                              =======    =======
</TABLE>

     Depreciation expense amounted to $2.8 million, $1.6 million and $0.8
million for the years ended December 31, 1999, 1998 and 1997, respectively.
Equipment and leasehold improvements at December 31, 1999 and 1998 include items
under capitalized leases in the amount of $0.6 million and $0.7 million,
respectively, and related accumulated amortization of $0.4 million and $0.3
million at December 31, 1999 and 1998, respectively. These leases are secured by
the equipment leased thereunder.

3.  PATENTS, LICENSES AND OTHER ASSETS

  Patents

     Patent costs are incurred in connection with obtaining certain patents and
filing of related patent applications. Patent amortization expense, which
amounted to approximately $28,000 in each of 1999, 1998 and 1997, 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 agreement with an affiliate of
the University of Chicago for an exclusive license to use certain proprietary
technology developed by the Company's Chief Scientific Officer and to develop,
use, and sell licensed products or processes under the license patent rights.
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) and must
pay minimum royalties of $25,000 per annum beginning in 1997 and increasing to
$100,000 per annum over the term of the license which terminates at expiration
of the related patent.

4.  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 11.32% to 14.98% and are
secured by related equipment. At December 31, 1999, the Company has
approximately $2.0 million available for borrowings under an existing loan
agreement.

                                       44
<PAGE>   46
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Future minimum payments under the capital lease and loan agreements are as
follows (in thousands):

<TABLE>
<S>                                                           <C>
YEARS ENDING DECEMBER 31:
  2000......................................................  $ 2,841
  2001......................................................    2,510
  2002......................................................    2,342
  2003......................................................      836
  2004......................................................      394
  2005......................................................       34
                                                              -------
Total loan payments.........................................    8,957
     Less: Amount representing interest.....................   (1,646)
                                                              -------
Present value of future loan payments.......................    7,311
     Less: Current portion..................................   (2,090)
                                                              -------
Noncurrent portion..........................................  $ 5,221
                                                              =======
</TABLE>

5.  OPERATING LEASE COMMITMENTS AND CONTINGENCIES

  Operating Lease Commitments

     The Company leases two facilities under operating lease agreements that
expire in June 2005. One of the leases has a five-year renewal option, which if
exercised, would extend the lease to 2010. Rental expense was approximately $1.4
million in 1999, $1.1 million in 1998, $0.2 million in 1997. 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 and the actual cash flow is
included in the minimum lease payment schedule below. Minimum non-cancelable
future rental commitments under operating leases at December 31, 1999 are as
follows (in thousands):

<TABLE>
<CAPTION>
                                                              MINIMUM RENTAL
YEARS ENDED DECEMBER 31,                                       COMMITMENTS
- ------------------------                                      --------------
<S>                                                           <C>
       2000.................................................      $1,409
       2001.................................................       1,459
       2002.................................................       1,509
       2003.................................................       1,559
       2004.................................................       1,606
       2005.................................................         809
                                                                  ------
                                                                  $8,351
                                                                  ======
</TABLE>

  Cash on Deposit

     In accordance with the terms of a 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.
Provided that no event of default under the lease has occurred, the letter of
credit and the cash collateralizing it will be reduced by $0.5 million
commencing in 2001 and will be further reduced by $0.5 million each year
thereafter. 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.

                                       45
<PAGE>   47
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

  Contingencies

     On March 3, 1997, the Company brought suit against Affymetrix, Inc. in the
U.S. District Court for the Northern District of California, San Jose Division,
alleging infringement by Affymetrix of the Company's U.S. Patent Nos. 5,202,231
and 5,525,464 (Hyseq, Inc. v. Affymetrix, Inc., Case No. C 97-20188 RMW (PVT))
("Hyseq I"). On May 5, 1997, the Company filed an Amended Complaint. On December
9, 1997, the Company filed a second lawsuit against Affymetrix alleging
infringement by Affymetrix of the Company's U.S. Patent No. 5,695,940 (Hyseq,
Inc. v. Affymetrix, Inc., Case No. C-97 4469 THE) ("Hyseq II"). On April 22,
1998 the two cases were consolidated before Judge Ronald M. Whyte.

     The consolidated suits allege that Affymetrix willfully infringed, and
continues to infringe, the Company's patents covering sequencing by
hybridization ("SBH") technology. Through the lawsuit, the Company seeks both to
enjoin Affymetrix from infringing its patents covering SBH technology and an
award of monetary damages for Affymetrix' past infringement. On May 19, 1997,
Affymetrix filed an Answer and Affirmative Defenses to the First Amended
Complaint in Hyseq I and also filed a counterclaim against the Company. The
counterclaim seeks a declaratory judgment of invalidity and non-infringement
with respect to the two patents asserted in Hyseq I. On September 9, 1997, the
Company filed a reply to the counterclaim in which it denied the allegations of
invalidity and non-infringement. A similar answer and counterclaim was filed by
Affymetrix in Hyseq II on December 28, 1997, and a similar reply to the
counterclaim was filed by the Company on January 29, 1998. On August 1, 1997
(Hyseq I), and on March 28, 1998 (Hyseq II), initial case management conferences
were held in each case in which the Court entered a pre-trial schedule. The
Court held a claims construction hearing on November 17 and 18, 1998 in Hyseq I
and II. On July 12, 1999, Affymetrix filed an amended answer and counterclaim
alleging the additional defense that the patents were obtained through
inequitable conduct. On October 27, 1999, the Court issued an order construing
terms in the claims of the patents-in-suit and inviting the parties to submit
briefs setting forth any perceived errors or inconsistencies in the Order. The
Company and Affymetrix submitted their briefs on December 17 and 27, 1999,
respectively. On January 7, 2000, the Court held a further Case Management
Conference. On February 22, 2000, the Court received oral argument from the
parties regarding the Claims Construction Order. The Company and Affymetrix are
currently engaged in pretrial discovery during which documents and other written
discovery are being exchanged and depositions are being taken. While the Company
believes it has asserted valid claims and has meritorious defenses to the
counterclaims, this litigation is at an early stage and there can be no
assurance that the Company will prevail in these actions.

     On August 18, 1998, Affymetrix filed suit against the Company in the U.S.
District Court for the Northern District of California, San Francisco Division,
alleging that the Company infringed two of Affymetrix' U.S. patents, No.
5,795,716 and 5,744,305 (Affymetrix, Inc. v. Hyseq, Inc., Case No. C 98-13192).
Affymetrix filed an amended complaint on September 1, 1998 alleging infringement
of its U.S. Patent No. 5,800,992. The case has been reassigned to Judge Jeremy
Fogel in the San Jose Division. At the time of the assignment to Judge Fogel,
the case was also renumbered as Case No. C 99-21163 JF (MEJ). A Case Management
Conferences before Judge Fogel is scheduled for April 17, 2000. The Company
believes that Affymetrix' allegations are without merit and intends to
vigorously defend the action. However, the litigation is at a very early stage
and it is impossible to predict the ultimate outcome of this matter.

     On October 26, 1999, the Company filed a third lawsuit against Affymetrix
in the U.S. District Court for the Northern District of California, San
Francisco Division (Hyseq, Inc. v. Affymetrix, Inc., Case No. C-99 4735 MJJ)
("Hyseq III"), alleging infringement by Affymetrix of the Company's
recently-issued U.S. Patent No. 5,972,619 (the "'619 Patent"). Hyseq also
alleges that Affymetrix' U.S. Patent No. 5,795,716 is invalid because the
subject matter was first invented by Hyseq scientists and is claimed and covered
by Hyseq's '619 Patent. Affymetrix filed an answer and counterclaim on November
15, 1999. The counterclaim seeks a declaratory judgment of invalidity,
unenforceability and non-infringement with respect to Hyseq's '619 Patent. On
December 9, 1999, the Company filed a reply to the counterclaim in which it
denied

                                       46
<PAGE>   48
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

the allegations of invalidity, enforceability, and non-infringement.
Subsequently, Hyseq III was reassigned to Judge Fogel and was given Case No.
C-00-20050 JF/PVT. Hyseq III is presently scheduled for a Case Management
Conference on April 17, 2000 along with Affymetrix, Inc. v. Hyseq, Inc.

     On February 28, 2000, Judge Whyte issued an order directing each of the
parties involved in each of the above cases to submit statements regarding the
appropriateness of relating the cases before Judge Fogel with the Hyseq I and II
cases currently before Judge Whyte. The Company and Affymetrix submitted their
respective statements on March 10, 2000, as directed by the Court.

     The Company has incurred substantial costs and expended substantial
personnel time in asserting the Company's patent rights and defending its
technology against Affymetrix and may continue to incur such costs in asserting
its patent rights and defending its technology against Affymetrix or others.
There can be no assurance that the Company will be successful in these efforts.
Failure to successfully enforce its patent rights or the loss of these patent
rights covering SBH technology also could remove a legal obstacle to competitors
in designing platforms with similar competitive advantages.

6.  COLLABORATIVE AGREEMENTS

     In December 1999, the Company entered into an exclusive collaboration with
American Cyanamid Company, a subsidiary of American Home Products Corporation,
under which it may earn up to $60.0 million. Pursuant to the collaboration
agreement, the Company is working with American Cyanamid Company primarily to
develop agricultural products. The collaboration has an initial term of three
and one half years and can be extended by mutual agreement for up to four
additional one-year terms. In December 1999, the Company received an upfront
payment of $5.0 million from American Cyanamid which was classified as deferred
revenue. Subject to compliance with the terms of the contract, the Company
expects to recognize revenue from this collaboration over the term of the
agreement. A certain portion of the deferred revenue will be accounted for as
reimbursement of set-up costs related to initial deliverables. American Cyanamid
has the exclusive right to commercialize any agricultural products resulting
from the collaboration. The Company will receive royalties on any such products.
The agreement requires the Company to generate data at a specified level per
year that, if not met, could result in its breach of the agreement.

     In May 1997, the Company entered into an exclusive 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 has an initial term of
three years and can be extended by Chiron for two additional two-year periods.
Chiron paid a nonrefundable $1.0 million up-front licensing fee upon signing the
agreement and guaranteed payment of a minimum of $8.5 million in the first year
and $5.5 million in each of the two years thereafter in connection with the
Company's research on Chiron tissue sample libraries. The agreement requires the
Company to generate data at a specified level, which if not met, could result in
the Company's breach of the collaboration. 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. Concurrently with execution of the collaboration agreement, 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. Chiron also
purchased shares of common stock directly from the Company in a private
placement concurrent with the initial public offering for an aggregate purchase
price of $2.5 million. Total revenue recognized in 1999, 1998 and 1997 under the
agreement with Chiron was $4.9 million, $8.1 million and $5.3 million,
respectively. The Company has no future performance obligations related to the
revenue recognized in 1999, 1998 and 1997 and no portions of such revenues are
refundable.

     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
                                       47
<PAGE>   49
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

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 will pay the Company $3.0 million for the initial phase
of the collaboration. As of December 31, 1999, the Company had recognized $2.7
million in revenue from Kirin.

     In May 1997, the Company entered into an agreement with PE Corporation to
combine certain of the Company's chip technology and PE Corporation's life
science system capabilities to commercialize HyChip products (collectively, 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 satisfied the $5.0 million obligation under
its agreement with PE Corporation. The collaboration has an initial term of five
years and will be extended automatically thereafter unless the parties mutually
agree to terminate the collaboration. Pursuant to the agreement, the design,
development and manufacture of the HyChip "chip" is under the direction of the
Company, while design, development and manufacture of the system is under the
direction of PE Corporation. HyChip products will be distributed through PE
Corporation's Applied Biosystems Division. In June 1997, PE Corporation made an
equity investment of $5.0 million in return for shares of the Company's
preferred stock, which subsequently converted into common stock. PE Corporation
also purchased shares of common stock directly from the Company in a private
placement concurrent with the initial public offering for an aggregate purchase
price of $5.0 million. In 1999, the Company recognized approximately $0.3
million in revenue, resulting from both research funding reimbursement under the
collaboration and as a result of an expansion of the existing relationship. No
revenue was recorded in conjunction with the PE Corporation collaboration in
1998 and 1997.

     In February 1998, the Company entered into a collaborative agreement with
the University of California, San Francisco ("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. The Company has the
exclusive rights from UCSF to commercialize the proprietary databases derived
from this collaboration.

7.  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.

     In May and June 1997, Chiron and PE acquired Series B preferred stock in a
private placement that generated net proceeds to the Company of $10.0 million.
All shares of the Company's outstanding preferred stock automatically converted
to common stock in connection with the Company's initial public offering.

     As of December 31, 1999 and 1998, 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

                                       48
<PAGE>   50
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

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.

  Common Stock

     The Company's initial public offering of 3,000,000 shares of common stock,
which generated net proceeds of approximately $38.0 million, was effective
August 7, 1997. In September 1997, the Company's underwriters exercised their
option to purchase 450,000 additional shares at $14.00 per share to cover over-
allotments, for additional net proceeds to the Company of $5.9 million.
Concurrently with the initial public offering, the Company completed a private
placement of shares of its common stock to Chiron and PE Corporation for net
proceeds of $2.5 million and $5.0 million, respectively.

     In December 1996, a former officer of the Company purchased 161,280 shares
of common stock at $4.17 per share for a total purchase price of approximately
$0.7 million. Simultaneously with the purchase of such stock, the officer
borrowed from the Company approximately $0.7 million as evidenced by a
promissory note that bore interest at 3% per annum, matures in December 2001,
and is secured by and with recourse only to the 161,280 shares. In March 1997,
the Company sold a total of 179,712 shares of common stock for $6.51 per share
to this officer in exchange for a second promissory note with terms similar to
the one previously described.

     Also in December 1996, another officer of the Company exercised options to
purchase 48,000 shares of common stock at an exercise price of $1.56 per share
and exercised warrants to purchase 144,000 shares of common stock at $2.90 per
share. Simultaneously with the exercises, the officer borrowed from the Company
approximately $0.5 million, as evidenced by a promissory note that bears
interest at 3% per annum, matures in December 2001, and is secured by and with
recourse only to 118,080 shares. In March 1997, the Company sold a total of
179,712 shares of common stock for $6.51 per share to this officer of the
Company in exchange for a second promissory note with terms similar to those
described above.

  Deferred Compensation

     The Company has recorded deferred compensation of $695,000 representing the
difference between the issuance and exercise prices related to stock awards and
options and the deemed 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 deferred compensation expense was $89,000, $319,000,
and $250,000 in 1999, 1998 and 1997, respectively. At December 31, 1999, the
deferred compensation balance was approximately $37,000.

  Warrants

     As of December 31, 1999, warrants to purchase 475,184 shares of common
stock were outstanding at exercise prices ranging from $3.42 to $5.21 ($4.07
weighted average exercise price) per share. These warrants are held by certain
investors, executive officers and the private placement agent for a 1996
preferred stock financing.

  Stock Option Plans

     In 1995, the Company's stockholders adopted the 1995 Employee Stock Option
Plan (the "1995 Plan"). The Company initially reserved a total of 1,152,000
common shares for issuance under the 1995 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
1995 Plan may be either incentive stock options or nonstatutory stock options.
Incentive stock options may be granted to employees

                                       49
<PAGE>   51
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

with exercise prices of not less than fair 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 and expire 10 years from the date of
grant. At December 31, 1999, 1,217,786 shares were outstanding under the 1995
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 1995 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. As of December 31, 1999, 468,418
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 (the "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. A total of 138,240 shares of common stock have
been reserved for issuance under the Directors Plan, of which options to
purchase 93,120 shares were issued and outstanding at December 31, 1999.

     In 1999, the Company adopted a Scientific Advisory Board/Consultants Stock
Option Plan ("SAB Plan"), which 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
SAB Plan, of which no shares were issued and outstanding at December 31, 1999.

     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:

<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31,
                                                     -----------------------------------
                                                       1999         1998         1997
                                                     ---------    ---------    ---------
<S>                                                  <C>          <C>          <C>
Volatility.........................................    1.64          .77          .53
Risk-free interest rate............................    6.25%        4.8%         6.2%
Dividend yield.....................................     --           --           --
Expected life of option............................  2.5 years    2.3 years    2.4 years
</TABLE>

     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.

                                       50
<PAGE>   52
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     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 1999.

     The Company's pro forma information follows (in thousands, except for per
share information):

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                              -------------------------------
                                                                1999        1998       1997
                                                              --------    --------    -------
<S>                                                           <C>         <C>         <C>
Net loss....................................................  $(18,547)   $(16,369)   $(6,537)
Pro forma net loss..........................................  $(19,484)   $(16,896)   $(7,388)
Basic and diluted net loss per share........................  $  (1.43)   $  (1.27)   $ (0.86)
Pro forma basic and diluted net loss per share..............  $  (1.50)   $  (1.31)   $ (0.97)
</TABLE>

     A summary of the Company's stock options activity, and related information
follows:

<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31,
                                    ---------------------------------------------------------------------
                                            1999                    1998                    1997
                                    ---------------------   ---------------------   ---------------------
                                                WEIGHTED-               WEIGHTED-               WEIGHTED-
                                                 AVERAGE                 AVERAGE                 AVERAGE
                                    NUMBER OF   EXERCISE    NUMBER OF   EXERCISE    NUMBER OF   EXERCISE
                                     SHARES       PRICE      SHARES       PRICE      SHARES       PRICE
                                    ---------   ---------   ---------   ---------   ---------   ---------
<S>                                 <C>         <C>         <C>         <C>         <C>         <C>
Options outstanding at beginning
  of period.......................  1,583,558     $4.03     1,356,941     $3.88     1,153,553     $2.77
  Options granted.................    776,720     $3.77       424,780     $5.87       292,816     $8.34
  Options exercised...............   (144,466)    $1.96       (39,138)    $3.17       (20,888)    $1.60
  Options canceled................   (436,488)    $5.18      (159,025)    $7.91       (68,540)    $4.87
                                    ---------               ---------               ---------
Options outstanding at end
  of period.......................  1,779,324     $3.80     1,583,558     $4.03     1,356,941     $3.88
                                    =========               =========               =========
</TABLE>

     The following table summarizes information about stock options outstanding
and exercisable at December 31, 1999:

<TABLE>
<CAPTION>
                               OPTIONS OUTSTANDING                    OPTIONS EXERCISABLE
                 -----------------------------------------------   --------------------------
                             WEIGHTED-AVERAGE      WEIGHTED-                     WEIGHTED-
   RANGE OF      NUMBER OF      REMAINING       AVERAGE EXERCISE   NUMBER OF      AVERAGE
EXERCISE PRICE    SHARES     CONTRACTUAL LIFE        PRICE          SHARES     EXERCISE PRICE
- ---------------  ---------   ----------------   ----------------   ---------   --------------
<S>              <C>         <C>                <C>                <C>         <C>
$ 0.78 - $ 1.82..   456,998        4.50              $ 1.56         456,998        $ 1.56
$ 3.19 - $ 6.51.. 1,152,918        8.56              $ 4.02         359,147        $ 4.31
$ 7.00 - $10.06..   160,948        7.90              $ 8.08          63,267        $ 8.36
$12.03 - $13.66..     8,460        9.78              $12.62             960        $13.00
                 ---------                                          -------
                 1,779,324         7.46              $ 3.80         880,372        $ 3.18
                 =========                                          =======
</TABLE>

     The weighted-average grant-date fair value of options granted during the
years ended December 31, 1999, 1998 and 1997 was $3.52, $3.71 and $8.37,
respectively.

  Employee Stock Purchase Plan

     In 1998, the Company's stockholders approved an Employee Stock Purchase
Plan (the "ESPP"), 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 the

                                       51
<PAGE>   53
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

year ended December 31, 1999, 43,773 shares of the Company's stock were sold
under the ESPP at a weighted-average price of $2.84 per share.

     In 1999, the Company adopted a Non-Qualified Stock Purchase Plan covering
an aggregate of 50,000 shares of the Company's common stock, of which no shares
were sold as of December 31, 1999.

8.  INCOME TAXES

     As of December 31, 1999, the Company had federal and state net operating
loss carryforwards of approximately $47.0 million and $6.6 million,
respectively. The Company also had federal and California research and
development tax credit carryforwards of approximately $1.7 million and $1.4
million, respectively. The federal net operating loss and credit carryforwards
will expire at various dates beginning in the year 2008 through 2019, if not
utilized. The state of California net operating losses will expire at various
dates beginning in 2000 through 2004, if not utilized.

     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):

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                              ------------------------
                                                                 1999          1998
                                                              ----------    ----------
<S>                                                           <C>           <C>
Deferred Tax Assets:
Net operating loss carryforwards............................   $ 16,400      $  9,800
Research and other credits..................................      3,100         1,900
Capitalized research expenses...............................      1,300         1,500
Other -- net................................................      1,300           600
                                                               --------      --------
Total deferred tax assets...................................     22,100        13,800
  Valuation allowance.......................................    (22,100)      (13,800)
                                                               --------      --------
Net deferred tax assets.....................................   $     --      $     --
                                                               ========      ========
</TABLE>

     The net valuation allowance increased by $8.3 million, $8.5 million and
$2.4 million for the fiscal years ended December 31, 1999, 1998 and 1997,
respectively.

9.  TRANSACTIONS WITH RELATED PARTIES

     As of December 31, 1999, 1998 and 1997, the Company had outstanding
accounts payable balances of $86,180, $100,237 and $152,113, respectively, for
professional services rendered by a law firm of which the spouse of the
Company's President and Chief Executive Officer was a member during these
periods. The Company incurred legal fees and costs to this law firm of
approximately $441,000, $979,000 and $1,020,000 for the years ended December 31,
1999, 1998 and 1997, respectively.

     In January 1997, this firm purchased 76,800 shares of the Company's common
stock at $6.51 per share. This firm paid $102,415 in cash and delivered a
promissory note to the Company for the balance in the amount of $397,585 secured
by 61,069 shares of common stock. The note required payment of interest at 8.25%
per annum. As of December 31, 1998, the principal balance and interest had been
paid in full.

                                       52
<PAGE>   54
                                  HYSEQ, INC.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

10.  SEGMENT INFORMATION

     The Company adopted Statement of Financial Accounting Standards No. 131,
"Disclosures about Segments of an Enterprise and Related Information" ("SFAS
131") effective January 1, 1998. SFAS 131 establishes standards for reporting
information regarding operating segments in annual financial statements and
requires selected information for those segments to be presented in interim
financial reports issued to stockholders. SFAS 131 also establishes standards
for related disclosures about products, services and geographic areas. 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. To date, the Company has viewed its operations as principally
one segment. As a result, the financial information disclosed herein materially
represents all of the financial information related to the Company's principal
operating segment.

11.  SUBSEQUENT EVENTS (UNAUDITED)

     In January 2000, a former officer of the Company repaid two promissory
notes plus accrued interest totaling $2,003,624 due to the Company related to
stock purchase agreements entered into in December 1996 and March 1997. The
notes were repaid by surrendering to the Company approximately 56,000 shares of
common stock.

     In February 2000, an officer and director of the Company repaid two
promissory notes plus accrued interest totaling $1,811,208 due to the Company
related to stock purchase agreements entered into in December 1996 and March
1997. The notes were repaid by surrendering to the Company approximately 15,000
shares of common stock.

     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.

                                       53
<PAGE>   55

                                    PART III

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

     Not applicable.

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     The response to this item is incorporated by reference from the discussion
responsive thereto under the captions "Management" and "Compliance with Section
16(a) of the Securities Exchange Act of 1934" in the Company's Proxy Statement
for its 2000 Annual Meeting of Stockholders.

ITEM 11.  EXECUTION COMPENSATION

     The response to this item is incorporated by reference from the discussion
responsive thereto under the caption "Executive Compensation" in the Company's
Proxy Statement for its 2000 Annual Meeting of Stockholders.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The response to this item is incorporated by reference from the discussion
responsive thereto under the caption "Security Ownership of Certain Beneficial
Owners and Management" in the Company's Proxy Statement for its 2000 Annual
Meeting of Stockholders.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     The response to this item is incorporated by reference from the discussion
responsive thereto under the caption "Certain Transactions" in the Company's
Proxy Statement for its 2000 Annual Meeting of Stockholders.

                                       54
<PAGE>   56

                                    PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a)(1)  The Financial Statements and notes thereto included in Item 8 to this
        Form 10-K Report are incorporated herein by reference.

(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.

<TABLE>
<CAPTION>
EXHIBIT
  NO.                             DESCRIPTION
- -------   ------------------------------------------------------------
<S>       <C>
 3.1      Amended and Restated Articles of Incorporation of the
          Company, as amended*
 3.2(a)   By-Laws of the Company*
 3.2(b)   First Amendment to the By-Laws*******
 4.1      Specimen Common Stock certificate*
 4.2      Form of Registration Rights Agreement*
 4.3      Form of Warrant Agreement*
 4.4      Rights Agreement between Hyseq, Inc. and U.S. Stock Transfer
          dated June 5, 1998**
10.1      Form of Indemnification Agreement between the Company and
          each of its directors and
          officers*
10.2      Stock Option Plan, as amended+***
10.4      Non-Employee Director Stock Option Plan, as amended+****
10.5      Patent License Agreement between Arch Development
          Corporation and Hyseq, Inc. dated
          June 7, 1994*
10.6      Stock Purchase Agreement for Series B Convertible Preferred
          Stock dated May 28, 1997*
10.7      Collaboration Agreement between Hyseq Inc. and Chiron
          Corporation dated May 28, 1997*
10.10     Collaboration Agreement between Hyseq Inc. and The
          Perkin-Elmer Corporation dated
          May 28, 1997*
10.11     Employee Stock Purchase Plan+*****
10.12     Non-Qualified Employee Stock Purchase Plan
10.13     Scientific Advisory Board/Consultants Stock Option Plan
10.14     Collaboration Agreement between Hyseq, Inc. and American
          Cyanamid Company dated
          December 10, 1999******
21.1      Subsidiaries of Hyseq, Inc.
23.1      Consent of Ernst & Young LLP, Independent Auditors
27.1      Financial Data Schedule
</TABLE>

- ---------------

<TABLE>
<C>        <S>
        *  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, File No.
           333-29091.

       **  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.

      ***  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.

     ****  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.
</TABLE>

                                       55
<PAGE>   57
<TABLE>
<C>        <S>

    *****  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.

   ******  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.

  *******  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, 1998,
           File No. 00-22873.

        +  Denotes compensation plan in which an executive officer or
           director participates.

      (b)  Reports on Form 8-K.
</TABLE>

     One report on Form 8-K was filed on behalf of the Company during the last
quarter of the year ended December 31, 1999 (Form 8-K filed on December 16,
1999).

                                       56
<PAGE>   58

                                   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 the 17th day of March, 2000.

                                          HYSEQ, INC.

                                          By: /s/ LEWIS S. GRUBER
                                            ------------------------------------
                                            Lewis S. Gruber
                                            President and Chief Executive
                                              Officer

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed by the following persons in the capacities indicated on
the 17th day of March, 2000.

<TABLE>
<CAPTION>
                     SIGNATURE                                             TITLE
                     ---------                                             -----
<C>                                                  <S>

              /s/ GEORGE B. RATHMANN                 Chairman of the Board
- ---------------------------------------------------
                George B. Rathmann

                /s/ LEWIS S. GRUBER                  President and Chief Executive Officer, Director
- ---------------------------------------------------  (Principal Executive Officer)
                  Lewis S. Gruber

                /s/ MARK E. GITTER                   Chief Financial Officer (Principal Financial and
- ---------------------------------------------------  Accounting Officer)
                  Mark E. Gitter

               /s/ RADOJE T. DRMANAC                 Director
- ---------------------------------------------------
                 Radoje T. Drmanac

              /s/ RAYMOND F. BADDOUR                 Director
- ---------------------------------------------------
                Raymond F. Baddour

               /s/ GRETA E. MARSHALL                 Director
- ---------------------------------------------------
                 Greta E. Marshall

            /s/ THOMAS N. MCCARTER III               Director
- ---------------------------------------------------
              Thomas N. McCarter III

                /s/ ERNST SCHWEIZER                  Director
- ---------------------------------------------------
                  Ernst Schweizer

                /s/ ROBERT D. WEIST                  Director
- ---------------------------------------------------
                  Robert D. Weist
</TABLE>

                                       57
<PAGE>   59

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
  NO.                             DESCRIPTION
- -------   ------------------------------------------------------------
<S>       <C>
 3.1      Amended and Restated Articles of Incorporation of the
          Company, as amended*
 3.2(a)   By-Laws of the Company*
 3.2(b)   First Amendment to the By-Laws*******
 4.1      Specimen Common Stock certificate*
 4.2      Form of Registration Rights Agreement*
 4.3      Form of Warrant Agreement*
 4.4      Rights Agreement between Hyseq, Inc. and U.S. Stock Transfer
          dated June 5, 1998**
10.1      Form of Indemnification Agreement between the Company and
          each of its directors and officers*
10.2      Stock Option Plan, as amended+***
10.4      Non-Employee Director Stock Option Plan, as amended+****
10.5      Patent License Agreement between Arch Development
          Corporation and Hyseq, Inc. dated June 7, 1994*
10.6      Stock Purchase Agreement for Series B Convertible Preferred
          Stock dated May 28, 1997*
10.7      Collaboration Agreement between Hyseq Inc. and Chiron
          Corporation dated May 28, 1997*
10.10     Collaboration Agreement between Hyseq Inc. and The
          Perkin-Elmer Corporation dated May 28, 1997*
10.11     Employee Stock Purchase Plan+*****
10.12     Non-Qualified Employee Stock Purchase Plan
10.13     Scientific Advisory Board/Consultants Stock Option Plan
10.14     Collaboration Agreement between Hyseq Inc. and American
          Cyanamid Company dated December 10, 1999******
21.1      Subsidiaries of Hyseq, Inc.
23.1      Consent of Ernst & Young LLP, Independent Auditors
27.1      Financial Data Schedule
</TABLE>

- ---------------

<TABLE>
<C>        <S>
           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, File No.
        *  333-29091.

           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.

           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.

           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.

           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.

           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.

           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, 1998,
  *******  File No. 00-22873.

           Denotes compensation plan in which an executive officer or
        +  director participates.
</TABLE>

<PAGE>   1
                                                                   EXHIBIT 10.12


                                   HYSEQ, INC.
                   NON-QUALIFIED EMPLOYEE STOCK PURCHASE PLAN


1.       PURPOSE

The purpose of the Hyseq, Inc. Non-Qualified Employee Stock Purchase Plan is to
provide eligible Employees of Hyseq, Inc. and its Affiliates with an opportunity
to acquire a proprietary interest in the Company through the purchase of Common
Stock of the Company on a payroll deduction basis. It is believed that
participation in the ownership of the Company will be to the mutual benefit of
the eligible Employees and the Company. This Plan is not intended to constitute
an "employee stock purchase plan" within the meaning of Section 423 of the
Internal Revenue Code of 1986, as amended.

2.    DEFINITIONS

Unless otherwise specified or unless the context otherwise requires, the
following terms, as used in this Plan, have the following meanings. Wherever
appropriate, words used in the singular shall be deemed to include the plural
and vice versa, and the masculine gender shall be deemed to include the feminine
gender.

      (a)  ACCOUNT means the funds accumulated with respect to an Employee as a
      result of deductions from his paycheck for the purpose of purchasing
      Common Stock under the Plan. The funds allocated to an Employee's Account
      shall remain the property of the Employee at all times prior to the
      purchase of the Common Stock, but may be commingled with the assets of the
      Company and used for general corporate purposes. No interest shall be paid
      or accrued on any funds accumulated in the Accounts of Employees.

      (b)  AFFILIATE means a corporation, as defined in Section 424(f) of the
      Code, that is a parent or subsidiary of the Company, direct or indirect.

      (c)  BOARD means the Board of Directors of the Company.

      (d)  CODE means the Internal Revenue Code of 1986, as amended.

      (e)  COMMITTEE means the committee to which the Board delegates the power
      to act under or pursuant to the provisions of the Plan, or the Board if no
      committee is selected.

      (f)  COMMON STOCK means the shares of common stock of the Company, $.001
      par value.

      (g)  COMPANY means Hyseq, Inc., a Nevada corporation, and any corporate
      successor to all or substantially all of the assets or voting stock of the
      Company.
<PAGE>   2

      (h) COMPENSATION means the compensation paid to an Employee by the
      Company during a payroll period for federal income tax purposes, as
      reported on an Employee's Form W-2 (or comparable reporting form) for
      income tax withholding purposes.

      (i) EFFECTIVE DATE means the date the Plan is adopted by, and made
      effective by, the Board, subject to the limitations of Section 16.

      (j) EMPLOYEE means any person who is employed by the Company or an
      Affiliate on a regular full-time basis. A person shall be considered
      employed on a regular full-time basis if he is customarily employed for
      more than twenty (20) hours per week.

      (k) OFFERING DATE means the date on which the Committee grants Employees
      the option to purchase shares of Common Stock.

      (l) OFFERING PERIOD means the period between the Offering Date and the
      Purchase Date.

      (m) PURCHASE DATE means the date on which the Committee purchases the
      shares of Common Stock, which date shall be the last day of an Offering
      Period.

      (n) PARTICIPANT means an Employee who elects to participate in the Plan.

      (o) PLAN means the Hyseq, Inc. Non-Qualified Employee Stock Purchase Plan.

3.    ELIGIBILITY

All Employees of the Company (excluding, however, any Employee who on the date
the Plan is adopted by the Board is an "executive officer," as defined under the
Securities Exchange Act of 1934, as amended, or any regulations promulgated
thereunder) and, if designated by the Board, any Affiliate, who are employed by
the Company and/or such designated Affiliate shall be eligible to participate in
the Plan on the first Offering Date coincident with or next following the
Employee's completion of ninety (90) continuous days of employment.

4.    ADMINISTRATION

The Plan shall be administered by the Committee, which shall consist of not less
than two (2) members of the Board. Subject to the provisions of the Plan, the
Committee shall be vested with full authority to make, administer, and interpret
such rules and regulations as it deems necessary to administer the Plan, and any
determination, decision, or action of the Committee in connection with the
construction, interpretation, administration, and application of the Plan shall
be final, conclusive, and binding upon all Participants and any and all persons
claiming under or through any Participant. Notwithstanding anything to the
contrary in the Plan, the Committee shall have the discretion to modify the
terms of the Plan with respect to Participants who reside outside of the United
States or who are employed by a subsidiary of the Company that has been formed
under the laws of any foreign country, if such modification is necessary in
order to conform such terms to the requirements of local laws.




                                       2
<PAGE>   3

5.    STOCK

      (a)   The Common Stock to be sold to Participants under the Plan may, at
      the election of the Company, be either treasury shares, shares acquired on
      the open market, and/or shares originally issued for such purpose. The
      aggregate number of shares of Common Stock that shall be made available
      for purchase under the Plan shall not exceed fifty thousand (50,000)
      shares, subject to adjustment upon changes in capitalization of the
      Company as provided in subparagraph (b) below. In the event any purchase
      right granted under the Plan expires or terminates for any reason without
      having been exercised in full or ceases for any reason to be exercisable
      in whole or in part, the unpurchased shares subject thereto will again be
      available for purchase by Employees upon the exercise of purchase rights.
      If the total number of shares that otherwise would have been acquired
      under the Plan on any Purchase Date exceeds the number of shares of Common
      Stock then available under the Plan, the Company shall make a pro rata
      allocation of the shares remaining available in as nearly a uniform manner
      as shall be practicable and as it shall determine to be equitable. In such
      event, the payroll deductions to be made pursuant to the Participants'
      authorizations shall be reduced accordingly, or refunded to the
      Participants, as the case may be, and the Company shall give written
      notice of such reduction or refund to each affected Participant.

      (b)   Appropriate adjustments in the aggregate number of shares of Common
      Stock that shall be made available for purchase under the Plan shall be
      made to give effect to any mergers, consolidations, acquisitions,
      reorganizations, stock splits, stock dividends, or other relevant changes
      in the capitalization of the Company occurring after the Effective Date.
      The establishment of the Plan shall not affect in any way the right or
      power of the Company to make adjustments, reclassifications,
      reorganizations, or changes in its capital or business structure or to
      merge, consolidate, dissolve, liquidate, sell, or otherwise transfer all
      or any part of its business or assets. Adjustments under this Section 5
      shall be made in the sole discretion of the Committee, and its decision
      shall be binding and conclusive.

      (c)   A Participant shall not have any interest in shares covered by his
      authorized payroll deduction until shares of Common Stock are acquired for
      his Account.

6.    PARTICIPATION

      (a)   Each Employee may become a Participant in the Plan by authorizing a
      payroll deduction on a form provided by the Committee. Such authorization
      shall become effective on the next Offering Date following the delivery of
      the authorization form to the Committee; provided, (i) that the Employee
      is eligible under Section 3 to participate in the Plan on such Offering
      Date and (ii) that if the authorization form is delivered to the Committee
      less than fifteen (15) days prior to an Offering Date, it shall become
      effective on the first Offering Date that is fifteen (15) or more days
      following delivery of the authorization form to the Committee.

      (b)   At the time an Employee files his authorization for a payroll
      deduction, he shall elect to have deductions made from each paycheck that
      he receives, such deductions to




                                       3
<PAGE>   4

      continue until the Participant withdraws from the Plan or otherwise
      becomes ineligible to participate in the Plan. Authorized payroll
      deductions shall be for a minimum of one percent (1%) and a maximum of ten
      percent (10%) of the Participant's Compensation. The deduction rate so
      authorized shall continue in effect through the Offering Period and each
      succeeding Offering Period. A Participant may increase the rate of his
      payroll deduction effective as of any subsequent Offering Date by filing a
      new authorization form with the Company fifteen (15) or more days prior to
      the next Offering Date. A Participant may, at any time during any Offering
      Period, reduce his rate of payroll deduction by filing a new authorization
      form with the Company, which shall become effective as soon as practicable
      after it is filed.

      (c)   All Compensation deductions made for a Participant shall be credited
      to his Account. Except as may otherwise be provided by the Committee under
      Section 4, a Participant may not make any separate cash payment into his
      Account.

7.    PURCHASE OF SHARES

      (a)   On the Offering Date when a Participant's authorization form for a
      deduction becomes effective, and on each succeeding Offering Date
      thereafter, he shall be deemed to have been granted an option to purchase
      as many full shares of Common Stock as he will be able to purchase with
      the Compensation deductions credited to his Account during the payroll
      periods within the applicable Offering Period for which the Compensation
      deductions are made. In addition to the foregoing, any cash dividends paid
      on shares of Common Stock held in his Account shall be added to the
      Account, and used to purchase Common Stock as otherwise provided herein.

      (b)   The purchase price for the shares of Common Stock to be purchased
      with payroll deductions from the Participant shall be equal to the "fair
      market value" of a share of Common Stock on the Purchase Date. Fair market
      value shall be defined as the closing bid price of the Common Stock on the
      largest national securities exchange on which such Common Stock is listed
      at the time the Common Stock is to be valued. If the Common Stock is not
      then listed on any such exchange, the fair market value shall be the
      closing sales price if such is reported or otherwise the mean between the
      closing "Bid" and the closing "Ask" prices, if any, as reported in the
      National Association of Securities Dealers Automated Quotation System
      ("NASDAQ") for the date of valuation, or if none, on the most recent trade
      date thirty (30) days or less prior to the date of valuation for which
      such quotations are reported. If the Common Stock is not then listed on
      any such exchange or quoted in NASDAQ, the fair market value shall be the
      mean between the average of the "Bid" and the average of the "Ask" prices,
      if any, as reported in the National Daily Quotation Service for the date
      of valuation, or, if none, for the most recent trade date thirty (30) days
      or less prior to the date of valuation for which such quotations are
      reported. If the fair market value cannot be determined under the
      preceding three sentences, it shall be determined in good faith by the
      Committee.




                                       4
<PAGE>   5

8.    TIME OF PURCHASE

From time to time, the Committee shall grant to each Participant an option to
purchase shares of Common Stock in an amount equal to the number of shares of
Common Stock that the accumulated payroll deductions to be credited to his
Account during the Offering Period may purchase at the applicable purchase
price. Each Offering Period shall be for a specified period of time to be fixed
by the Committee. Each Participant who elects to purchase shares of Common Stock
hereunder shall be deemed to have exercised his option automatically on such
date of purchase. Administrative and commission costs on purchases shall be paid
by the Company. The Committee shall cause to be delivered periodically to each
Participant a statement showing the aggregate number of shares of Common Stock
in his Account, the number of shares of Common Stock purchased for him in the
preceding Offering Period, his aggregate Compensation deductions for the
preceding Offering Period, the price per share paid for the shares of Common
Stock purchased for him during the preceding Offering Period, and the amount of
cash, if any, remaining in his Account at the end of the preceding Offering
Period.

A Participant may request delivery to him of the cash in his Account or of the
shares of Common Stock held in his Account at any time (subject to any
limitations imposed by Section 16(b) of the Securities Exchange Act of 1934),
and the delivery thereof shall be made at such regular time as the Company or
its transfer agent shall determine. If such delivery is required at a time other
than the normal transfer date set by the Company or its transfer agent, the
Participant requesting such transfer shall pay the costs thereof. All of the
cash deposits in his Account shall be paid to him promptly after receipt of
notice of withdrawal, without interest. Shares of Common Stock to be delivered
to a Participant under the Plan shall be registered in the name of the
Participant or, if the Participant so directs in writing to the Committee, in
the name of the Participant and such person(s) as may be designated by the
Participant, to the extent permitted by applicable law, and delivered to the
Participant as soon as practicable after the request for a withdrawal. If a
Participant wishes to sell the shares of Common Stock in his Account, he may
notify the Committee to sell the same, in lieu of a distribution of such shares,
in which event all commission costs incurred in connection with the sale of the
shares of Common Stock shall be borne by the Participant. The Company shall pay
administrative costs associated therewith other than costs arising from a sale
occurring at a time different from the prearranged dates set by the Company or
its transfer agent for making such sales.

9.    CESSATION OF PARTICIPATION

A Participant may cease participation in the Plan at any time by notifying the
Committee in writing of his intent to cease his participation. If such notice is
received by the Committee the Company shall distribute to the Participant all of
his accumulated payroll deductions, without interest. If any Participant ceases
participation in the Plan, no further Compensation deductions shall be made on
his behalf after the effective date of his cessation, except in accordance with
a new authorization form filed with the Committee as provided in Section 6. Upon
ceasing participation in the Plan, a Participant shall not be permitted to
reenter the Plan until six (6) months have elapsed from the date his cessation
becomes effective.




                                       5
<PAGE>   6

10.   INELIGIBILITY

An Employee must be employed by the Company or an Affiliate on the Purchase Date
in order to participate in the purchase for that Offering Period. If an option
expires without first having been exercised, all funds credited to the
Participant's Account shall be refunded without interest. If a Participant
becomes ineligible to participate in the Plan at any time, all Compensation
deductions made on behalf of the Participant that have not been used to purchase
shares of Common Stock shall be paid to the Participant within sixty (60) days
after the Committee determines that the Participant is not eligible to
participate in the Plan.

11.   DESIGNATION OF BENEFICIARY

A Participant may file a written designation of a beneficiary who shall receive
any shares of Common Stock (or remaining Compensation deductions) credited to
the Participant's Account under the Plan in the event of such Participant's
death prior to delivery to him of the certificates for such shares (or remaining
Compensation deductions). The designation of a beneficiary may be changed by the
Participant at any time by written notice given in accordance with rules and
procedures established by the Committee. Upon the death of a Participant, and
upon receipt by the Company of proof of the identity and existence, at the
Participant's death, of a beneficiary validly designated by him under the Plan,
the Company shall deliver such shares of Common Stock (or remaining Compensation
deductions) to such beneficiary. In the event of the death of the Participant,
and in the absence of a beneficiary validly designated under the Plan who is
living at the time of such Participant's death, the Company shall deliver such
shares (or remaining Compensation deductions) to the executor or administrator
of the estate of the Participant, or if no such executor or administrator has
been appointed, the Company, in its sole discretion, may deliver such shares (or
remaining Compensation deductions) to the Participant's spouse or to any one or
more dependents or relatives of the Participant, or to such other person or
persons as the Company may designate on behalf of the estate of such deceased
Participant.

12.   TRANSFERABILITY

Neither Compensation deductions nor Plan contributions credited to a
Participant's Account nor any rights with regard to Plan participation or the
right to purchase shares of Common Stock under the Plan may be assigned,
transferred, pledged, or otherwise disposed of in any way by a Participant other
than by will or the laws of descent and distribution; provided, however, that
shares of Common Stock purchased on behalf of a Participant and left in his
Account shall be subject to his absolute control. Any attempted assignment,
transfer, pledge, or other disposition shall be void and without effect.

13.   AMENDMENT OR TERMINATION

The Board may at any time amend the Plan in any respect, or terminate the Plan,
provided that no amendment or termination may decrease the rights of a
Participant during an Offering Period without his consent.





                                       6
<PAGE>   7

14.   NOTICES

All notices or other communications by a Participant under or in connection with
the Plan shall be deemed to have been duly given when received in writing by the
Chief Financial Officer of the Company or when received in the form specified by
the Committee at the location and by the person designated by the Committee for
the receipt thereof.

15.   LIMITATIONS

Notwithstanding any other provisions of the Plan:

      (a)  All Employees shall have the same rights and privileges under the
      Plan, except that the amount of Common Stock that may be purchased
      pursuant to the Plan shall bear a uniform relationship to an Employee's
      Compensation. All rules and determinations of the Committee shall be
      uniformly and consistently applied to all persons in similar
      circumstances.

      (b)  Nothing in the Plan shall confer upon any Employee the right to
      continue in the employment of the Company or any Affiliate or affect the
      right that the Company or any Affiliate may have to terminate the
      employment of such Employee.

      (c)  No Participant shall have any right as a stockholder unless and
      until certificates for shares of Common Stock are issued to him or
      allocated to his Account.

      (d)  If under any provision of the Plan that requires a computation of the
      number of shares of Common Stock to be purchased, the number so computed
      is not a whole number of shares of Common Stock, such number of shares of
      Common Stock shall be rounded down to the next whole number.

      (e)  The Plan is intended to provide shares of Common Stock for investment
      and not for resale. The Company does not, however, intend to restrict or
      influence any Participant in the conduct of his own affairs. A
      Participant, therefore, may sell shares of Common Stock purchased under
      the Plan at any time he chooses, subject to compliance with any applicable
      federal or state securities laws or any applicable Company restriction or
      blackout periods; provided, however, that because of certain federal tax
      requirements, each Participant shall agree, by entering the Plan:

           (i)   that the Company may withhold, pursuant to Code ss.ss. 3102,
           3301, and 3402, from his wages and other cash compensation paid to
           him in all payroll periods following in the same calendar year, any
           taxes the Company may become liable for in respect of amounts
           includable in his income as compensation as a result of the
           acquisition of Common Stock under the Plan; and

           (ii)  that he shall repay the Company any amount of taxes the Company
           may become liable for in respect of amounts includable in his income
           as compensation as a result of a purchase of Common Stock under the
           Plan that cannot be satisfied




                                       7
<PAGE>   8

           by withholding from the wages and other cash compensation paid to him
           by the Company.


      (f)  This Plan is intended to comply in all respects with applicable law
      and regulations, including with respect to Participants who are officers
      or directors for purposes of Section 16 of the Securities Exchange Act of
      1934, as amended from time to time, Rule 16b-3 of the Securities and
      Exchange Commission. In case any one or more provisions of this Plan shall
      be held invalid, illegal, or unenforceable in any respect under applicable
      law and regulation (including Rule 16b-3), the validity, legality, and
      enforceability of the remaining provisions shall not in any way be
      affected or impaired thereby and the invalid, illegal, or unenforceable
      provision shall be deemed null and void; however, to the extent permitted
      by law, any provision that could be deemed null and void shall first be
      construed, interpreted, or revised retroactively to permit this Plan to be
      construed in compliance with all applicable law (including Rule 16b-3), so
      as to further the intent of this Plan. Notwithstanding anything herein to
      the contrary, with respect to Participants who are officers and directors
      for purposes of Section 16(b) of the Securities Exchange Act of 1934, as
      amended from time to time, and if required to comply with the rules
      promulgated thereunder, such Participants shall not be permitted to direct
      the sale of any Common Stock purchased hereunder until at least six (6)
      months have elapsed from the date of a purchase, unless the Committee
      determines that the sale of the Common Stock otherwise satisfies the then
      current Rule 16b-3 requirements.

16.   EFFECTIVE DATE AND APPROVALS

The Plan shall become effective at a time when:

      (a)   the Plan has been adopted by the Board; and

      (b)   a registration statement on Form S-8 under the Securities Act of
      1933, as amended, has become effective with respect to the Plan; and

      (c)   the Committee has notified the eligible Employees that they may
      commence participation in the Plan.

Unless sooner terminated by the Board, or as set forth above, the Plan shall
terminate upon the earlier of (i) the tenth (10th) anniversary of the adoption
of the Plan by the Board, or (ii) the date on which all shares available for
issuance under the Plan shall have been sold under the Plan.

17.   APPLICABLE LAW

All questions pertaining to the validity, construction, and administration of
the Plan shall be determined in conformity with the laws of Nevada.

Adopted the 8th day of November, 1999.





                                       8

<PAGE>   1
                                                                   EXHIBIT 10.13

                                   HYSEQ, INC.
                      SCIENTIFIC ADVISORY BOARD/CONSULTANTS
                                STOCK OPTION PLAN


                                   1. GENERAL

1.1   PURPOSE:

      Hyseq Inc., a Nevada corporation (the "Company"), hereby adopts this
Scientific Advisory Board/Consultants Stock Option Plan. This plan shall be
known as the HYSEQ, INC. SCIENTIFIC ADVISORY BOARD/CONSULTANTS STOCK OPTION PLAN
(the "Plan"). The purpose of the Plan is to foster and promote the long-term
financial success of the Company and materially increase stockholder value by:
(a) motivating superior performance by means of long-term performance related
incentives, (b) encouraging, and providing a means to obtain, an ownership
interest in the Company, (c) attracting and retaining outstanding talent by
providing incentive compensation opportunities competitive with other companies
and (d) enabling certain key non-employees to participate in the long-term
growth and financial success of the Company.

1.2   ADMINISTRATION:

      (a)   The Plan shall be administered by the Compensation Committee of the
Board of Directors of the Company (the "Board") or such other committee of
directors as is designated by the Board (the "Committee"), which shall consist
of two or more members. The members shall be appointed by the Board, and any
vacancy on the Committee shall be filled by the Board.

      (b)   Subject to the limitations of the Plan, the Committee shall have the
sole and complete authority: (i) to interpret the Plan and to adopt, amend and
rescind administrative guidelines and other rules and regulations relating to
the Plan, (ii) to correct any defect or omission or to reconcile any
inconsistency in the Plan or in any award granted hereunder and (iii) to make
all other determinations and to take all other actions necessary or advisable
for the implementation and administration of the Plan. The Committee's
determinations on matters within its authority shall be conclusive and binding
upon the Company and all other persons.

      (c)   All expenses associated with the Plan shall be borne by the Company.

      (d)   The Committee may, to the extent that any such action will not
prevent the Plan from complying with Rule 16b-3, delegate any of its authority
hereunder to such persons as it deems appropriate.






<PAGE>   2
1.3   PARTICIPATION:

      Participation in the Plan shall be limited only to those individuals
who are non-employee members of the Scientific Advisory Board (the "SAB") of the
Company (each an "SAB Member") or other non-employee consultants of the Company
who are designated by the Board or the Committee as being eligible to be granted
one or more Options under the Plan (a "Participant") . Notwithstanding the
foregoing, Options shall only be granted to consultants under the Plan if (i)
the consultant is a natural person and the consultant provides bona fide
services to the Company which services are not in connection with the offer or
sale of securities in a capital raising transaction, and do not directly or
indirectly promote or maintain a market for the Company's securities, or (ii) if
registration of the shares of Common Stock subject to such options is otherwise
permitted under the Securities Act of 1933 on a Form S-8.

1.4   TYPES OF AWARDS UNDER PLAN:

      Awards under the Plan will be in the form of non-statutory stock options
("Options"), as described in Article 2.

1.5   SHARES SUBJECT TO THE PLAN:

      Shares of stock covered by Options granted under the Plan may be, in
whole or in part, authorized and unissued or treasury shares of the Company's
common stock, $.001 par value per share, or such other shares as may be
substituted pursuant to Section 3.2 ("Common Stock"). The maximum number of
shares of Common Stock which may be issued for all purposes under the Plan shall
be thirty thousand (30,000) (subject to adjustment pursuant to Section 3.2). Any
shares of Common Stock subject to an Option which, for any reason, is canceled
or terminated without having been exercised, shall again be available for
Options under the Plan. No fractional shares shall be issued, and the Committee
shall determine the manner in which fractional share value shall be treated.

1.6   GENDER AND NUMBER:

      Except when otherwise indicated by the context, words in the masculine
gender when used in the Plan shall include the feminine gender, the singular
shall include the plural, and the plural shall include the singular.





                                       2
<PAGE>   3

                                2. STOCK OPTIONS

2.1   AWARD OF STOCK OPTIONS:

      (a)  On the later of the (i) the first meeting of the SAB Members
following the effective date of the Plan or (ii) date on which an individual
first becomes an SAB Member, such SAB Member will automatically be awarded a
stock Option (an "Initial Option" or the "Initial Options") under the Plan to
purchase 1,000 shares of Common Stock (subject to adjustment pursuant to Section
3.2). Thereafter, effective on the date of each annual meeting (the "Annual
Meeting") of the stockholders of the Company (the "Stockholders"), commencing
with the Annual Meeting of the Stockholders held in 2001, each SAB Member then
in office who satisfies the conditions set forth in Section 1.3, shall
automatically be awarded an additional stock Option (a "Subsequent Option" or
the "Subsequent Options") to purchase 1,750 shares of Common Stock.

      (b)  In addition to the Initial Option and the Subsequent Option grants
to SAB Members as set forth in Section 2.1a, the Committee may at anytime and
from time to time grant one or more Options to one or more Participants who
satisfies the conditions set forth in Section 1.3, and may designate the number
of shares to be subject to each Option so granted, and the vesting schedule
thereof as provided in Section 2.4(d).

2.2   STOCK OPTION AGREEMENTS:

      The award of an Option shall be evidenced by a signed written agreement
(a "Stock Option Agreement") containing such terms and conditions as the
Committee may from time to time determine.

2.3   OPTION PRICE:

      The purchase price of Common Stock under each Option (the "Option
Price") shall be not less than the Fair Market Value of the Common Stock on the
date the Option is awarded.

2.4   EXERCISE AND TERM OF OPTIONS:

      (a)  Options may be exercised, in whole or in part, by the delivery of
written notice of exercise and payment of the aggregate Option Price for the
shares to be purchased to the Corporate Secretary of the Company. On the date
specified in such written notice, the Company shall accept payment for the
Option shares in cash, by bank or certified check, by wire transfer, or by such
other means as may be approved by the Committee. If approved in advance by the
Committee, payment may also be made (i) by delivering shares of Common Stock
already owned for at least six (6) months by the Participant and which have a
total Fair Market Value on the date of such delivery equal to the Option Price;
(ii) by authorizing the Company to retain Option




                                       3
<PAGE>   4

shares that otherwise would be issuable upon exercise of the Option having a
total Fair Market Value on the date of delivery equal to the Option Price; (iii)
by the delivery of cash or the extension of credit by a broker-dealer to whom
the Participant has submitted a notice of exercise or otherwise indicated an
intent to exercise an Option (in accordance with part 220, Chapter II, Title 12
of the Code of Federal Regulations, a so-called "cashless" exercise); or (iv) by
any combination of the foregoing. As soon as practicable after receipt of each
notice and full payment, the Company shall deliver to the Participant a
certificate or certificates representing the acquired shares of Common Stock.

      (b)  Each certificate for shares issued upon exercise of an Option, unless
at the time of exercise such shares are registered with the Securities and
Exchange Commission (the "Commission"), under the Securities Act of 1933, as
amended (the "Act"), shall bear the following legend:

      NO SALE, TRANSFER, PLEDGE OR OTHER DISPOSITION OF THESE SHARES SHALL BE
      MADE EXCEPT PURSUANT TO REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS
      AMENDED, OR PURSUANT TO AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY
      THAT REGISTRATION IS NOT REQUIRED.

      Any certificate issued at any time in exchange or substitution for any
certificate bearing such legend (except a new certificate issued upon completion
of a public distribution pursuant to a registration statement under the Act of
the securities represented thereby) shall also bear the above legend unless, in
the opinion of such counsel as shall be reasonably approved by the Company, the
securities represented thereby need no longer be subject to such restrictions.

      (c) The Initial Option shall become exercisable on the date of grant. The
Initial Option shall continue to be exercisable until the first to occur of the
tenth anniversary of the date of grant or thirty (30) days following the date
the Participant ceases to be a member of the SAB. Each of an SAB Member's
Subsequent Options shall become exercisable on the date of grant (the date of
each Annual Meeting) and shall continue to be exercisable until the first to
occur of the tenth anniversary of the date on which the Subsequent Option(s) was
granted or thirty (30) days following the date the Participant ceases to be an
SAB Member. Notwithstanding the foregoing, in the event that a Participant
ceases to be an SAB Member as the result of his termination for "cause" (as
defined herein), all of the Participant's outstanding Options shall immediately
terminate.

      (d) All Option grants other than the Initial Options and the Subsequent
Options shall become exercisable upon the date or dates prescribed by the
Committee, and the Committee may provide that such Option rights become
exercisable in installments over a period of years, or upon the attainment of
stated goals; provided, however, no Option granted hereunder shall be
exercisable beyond the tenth anniversary of the date the Option is granted. A
Participant who




                                       4

<PAGE>   5

ceases to be engaged as a consultant by the Company for any reason other than
for cause, may exercise any Option granted to such Participant, to the extent
that the right to purchase shares thereunder has become exercisable on the date
the Participant's services are terminated, but only within thirty (30) days
after the date the Participant's services are terminated, or, if earlier, within
the originally prescribed term of the Option, and subject to the condition that
no Option shall be exercisable after the expiration of the term of the Option.
Notwithstanding the foregoing, in the event that a Participant's services are
terminated by the Company for cause, all of the Participant's outstanding
Options shall immediately terminate.


                          3. MISCELLANEOUS PROVISIONS

3.1   NON-TRANSFERABILITY:

      No Option under the Plan, and no interest therein, shall be transferable
by the Participant otherwise than by will or, if the Participant dies intestate,
by the laws of descent and distribution. All Options shall be exercisable or
received during the Participant's lifetime only by the Participant or his legal
representative. Any transfer contrary to this Section 3.1 will nullify the
Option.

3.2   ADJUSTMENTS UPON CERTAIN CHANGES:

      (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 Options. A corresponding adjustment to the
consideration payable with respect to Options granted prior to any such change
shall also be made. Any such adjustment, however, shall be made without change
in the total payment, if any, applicable to the portion of the Option not
exercised but with a corresponding adjustment in the price for each share.

      (b) Upon the dissolution or liquidation of the Company, or upon a
reorganization, merger or consolidation of the Company with one or more
corporations as a result of which the Company is not the surviving corporation
or upon sale of all or substantially all of the Company's property, the Plan
shall terminate, and any outstanding Options shall terminate and be forfeited.
Notwithstanding the foregoing, the Committee may provide in writing in
connection with, or in contemplation of, any such transaction for any or all of
the following alternatives (separately or in combinations): (i) for the
assumption by the successor corporation of the Options theretofore granted or
the substitution by such corporation for such Options of options covering the
stock of the successor corporation, or a parent or subsidiary thereof, with
appropriate adjustments as to the number and kind of shares and prices; (ii) for
the continuance







                                       5
<PAGE>   6
of the Plan by such successor corporation in which event the Plan and the
Options shall continue in the manner and under the terms so provided; or (iii)
for the payment in cash or shares of Common Stock in lieu of and in complete
satisfaction of such Options.

3.3   TAX WITHHOLDING:

      (a)   The Company shall have the power to withhold, or require a
Participant to remit to the Company, an amount sufficient to satisfy any
withholding or other tax due from the Company with respect to any amount payable
and/or shares issuable under the Plan, and the Company may defer such payment or
issuance unless indemnified to its satisfaction.

      (b)   Subject to the consent of the Committee, due to the exercise of an
Option, a Participant may make an irrevocable election (an "Election") to (A)
have shares of Common Stock otherwise issuable upon such exercise withheld, or
(B) tender back to the Company shares of Common Stock received pursuant to such
exercise or (C) deliver back to the Company pursuant to such exercise previously
acquired shares of Common Stock of the Company having a Fair Market Value
sufficient to satisfy all or part of the Participant's estimated tax obligations
associated with the transaction. Such Election must be made by an SAB Member
prior to the date on which the relevant tax obligation arises (the "Tax Date").
The Committee may disapprove of any Election, may suspend or terminate the right
to make Elections, or may provide with respect to any Option under this Plan
that the right to make Elections shall not apply to such Options.

3.4   CONDITIONS ON OPTIONS:

      In addition to the other terms hereof, in the event a Participant's
status as an SAB Member ceases by reason of disability while holding any Option,
the rights of such Participant to any such Option shall be subject to the
conditions that until any such Option is exercised, he shall (a) not engage,
either directly or indirectly, in any manner or capacity as advisor, principal,
agent, partner, officer, director, employee, member of any association or
otherwise, in any business or activity which is at the time competitive with any
business or activity conducted by the Company and (b) be available at reasonable
times for consultations (which shall not require substantial time or effort) at
the request of the Company's management with respect to phases of the business
with which he was actively connected, but such consultations shall not be
required to be performed at any place or places outside of the United States of
America or during usual vacation periods or periods of illness or other
incapacity. In the event that either of the above conditions is not fulfilled,
the Participant shall forfeit all rights to any unexercised Option held on the
date of the breach of condition. Any determination by the Board of the Company,
which shall act upon the recommendation of the Chairman, that the Participant
is, or has, engaged in a competitive business or activity as aforesaid or has
not been available for consultations as aforesaid shall be conclusive.




                                       6
<PAGE>   7
3.5   AMENDMENT, SUSPENSION AND TERMINATION OF PLAN:

      (a)   The Board may suspend or terminate the Plan or any portion thereof
at any time and may amend it from time to time in such respects as the Board may
deem advisable in order that any Options thereunder shall conform to or
otherwise reflect any change in applicable laws or regulations, or to permit the
Company or the Participants to enjoy the benefits of any change in applicable
law or regulations, or in any other respect the Board may deem to be in the best
interests of the Company; provided, however, that any amendment shall be subject
to the approval of the stockholders of the Company at or before the next annual
meeting of the Stockholders if such stockholder approval is required by the
Code, any federal or state law as regulation, the rule of any stock exchange or
automated quotation system on which the Shares maybe listed or quoted, or if the
Board in its discretion, determines to submit such changes to the Plan to its
Stockholders for approval. No such amendment, suspension or termination shall
(A) impair the rights of Participants under outstanding Options without the
consent of the Participants affected thereby or (B) make any change that would
disqualify the Plan, or any other plan of the Company intended to be so
qualified, from the exemption period provided by Rule 16b-3 promulgated under
the Securities Exchange Act of 1934 (the "Exchange Act").

      (b)   The Committee may amend or modify any outstanding Options, in any
manner to the extent that the Committee would have had the authority under the
Plan to initially award such Options, as so modified or amended, including,
without limitation, to change the date or dates as of which such Options may be
exercised. No such amendment or modification shall impair the rights of any
Participant under any such Option without the consent of such Participant.

3.6   DEFINITIONS AND OTHER GENERAL PROVISIONS:

      (a)   The term "disability" as used under the Plan shall mean a finding by
the Committee that a Participant is fully and permanently unable to serve as an
SAB Member of the Company or otherwise unable to perform services on the
Company's behalf because of a physical or mental disability.

      (b)   The term "Fair Market Value" as it relates to Common Stock on any
given date means (i) the mean of the high and low sales prices of the Company's
Common Stock as reported by the Composite Tape of the New York Stock Exchange
(or, if not so reported, on any domestic stock exchanges on which the Common
Stock is then listed); or (ii) if the Common Stock is not listed on any domestic
stock exchange, the mean of the high and low sales prices of the Company's
Common Stock as reported by the National Association of Securities Dealers
Automated Quotation System (or, if not so reported, by the system then regarded
as the most reliable source of such quotations) or, if there are no reported
sales on such date, the mean of the closing bid and asked prices as so reported;
or, (iii) if the Common Stock is listed on a domestic exchange or quoted in the
domestic over-the-counter market, but there are not reported sales or
quotations, as the case may be, on the given date, the value determined pursuant
to (i) or (ii)





                                       7
<PAGE>   8

above using the reported sale prices or quotations on the last previous date on
which so reported; or (iv) if none of the foregoing clauses apply, the fair
value as determined in good faith by the Board or the Committee.

      (c)   The term "cause" as used under the Plan shall be deemed to include
(but shall not be limited to) wrongful appropriation of funds of the Company,
divulging confidential information about the Company to the public, the
commission of a gross misdemeanor or felony, or the performance of any similar
action that the Board or the Committee, in their sole discretion, may deem to be
sufficiently injurious to the interests of the Company to constitute substantial
cause for termination. The determination of the Board or the Committee as to the
existence of cause shall be conclusive and binding upon the Participant and the
Company.

3.7   LISTING, REGISTRATION AND LEGAL COMPLIANCE:

      Each Option shall be subject to the requirement that if at any time the
Committee shall determine, in its discretion, that the listing, registration or
qualification of such Option, or any shares of Common Stock or other property
subject thereto, upon any securities exchange or under any foreign, federal or
state securities or other law or regulation, or the consent or approval of any
governmental body or the taking of any other action to comply with or otherwise
with respect to any such law or regulation, is necessary or desirable as a
condition to or in connection with the granting of such Option or the issue,
delivery or purchase of shares of Common Stock or other property thereunder, no
such Option may be exercised or paid in Common Stock or other property unless
such listing, registration, qualification, consent, approval or other action
shall have been effected or obtained free of any conditions not acceptable to
the Committee and the holder of the Option will supply the Company with such
certificates, representations and information as the Company shall request and
shall otherwise cooperate with the Company in effecting or obtaining such
listing, registration, qualification, consent, approval or other action. In the
case of persons subject to Section 16(b) of the Exchange Act, the Committee may
at any time impose any limitations upon the exercise, delivery or payment of any
Option which, in the discretion of the Committee, are necessary or desirable in
order to comply with said Section 16(b) and the rules and regulations
thereunder. If the Company, as part of an offering of securities or otherwise,
finds it desirable because of foreign, federal or state legal or regulatory
requirements to reduce the period during which Options may be exercised, the
Committee may, in its discretion and without the holders' consent, so reduce
such period on not less than 15 days written notice to the holders thereof.

3.8   LOANS:

      The Committee may provide for the Company to make loans to finance the
exercise of any Option as well as the estimated or actual amount of any taxes
payable by the holder as a result of the exercise or payment of any Option and
may prescribe, or may empower the





                                       8
<PAGE>   9

Company to prescribe, the other terms and conditions (including but not limited
to the interest rate, maturity date and whether the loan will be secured or
unsecured) of any such loan.

3.9   INDEMNIFICATION:

      Each person who is or shall have been a member of the Committee shall be
indemnified and held harmless by the Company against and from any loss, cost,
liability, or expense that may be imposed upon or reasonably incurred by him in
connection with or resulting from any claim, action, suit, or proceeding to
which he may be a party or in which he may be involved by reason of any action
taken or failure to act under the Plan and against and from any and all amounts
paid by him in settlement thereof, with the Company's approval, or paid by him
in satisfaction of any judgment in any such action, suit, or proceeding against
him, provided he shall give the Company an opportunity, at its own expense, to
handle and defend the same before he undertakes to handle and defend it on his
own behalf. The foregoing right of indemnification shall not be exclusive of any
other rights of indemnification to which such persons may be entitled under the
Company's Amended and Restated Articles of Incorporation, as amended or Bylaws,
as amended, as a matter of law, or otherwise, or any power that the Company may
have to indemnify them or hold them harmless.

3.10  BENEFICIARY DESIGNATION:

      Each Participant under the Plan may name, from time to time, any
beneficiary or beneficiaries (who may be named contingently or successively) to
whom any benefit under the Plan is to be paid in case of his death before he
receives any or all of such benefit. Each designation will revoke all prior
designations by the same Participant, shall be in a form prescribed by the
Committee, and will be effective only when filed by the Participant in writing
with the Committee during his lifetime. In the absence of any such designation,
benefits remaining unpaid at the Participant's death shall be paid to his
estate.

3.11  RIGHTS OF PARTICIPANTS:

      Nothing in the Plan shall interfere with or limit in any way the right
of the Stockholders to terminate the services of any Participant as an SAB
Member of otherwise as a consultant of the Company, nor confer upon any
Participant any right to continue as an SAB Member or other consultant of the
Company for any period of time.

3.12  REQUIREMENTS OF LAW, GOVERNING LAW:

      The granting of Options and 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. The Plan, and all agreements hereunder, shall be construed in
accordance with and governed by the laws of the State of California. The




                                       9
<PAGE>   10

provisions of the Plan shall be interpreted so as to comply with the conditions
or requirements of Rule 16b-3 under the Exchange Act, unless a contrary
interpretation of any such provisions is otherwise required by applicable law.

3.13  EFFECTIVE DATE:

      This Stock Option Plan, having been approved by the Board shall be
deemed effective as of May 24, 1999. No awards of Options shall be made
hereunder after May 23, 2009.








                                       10

<PAGE>   1
                                                                    EXHIBIT 21.1




                          SUBSIDIARIES OF HYSEQ, INC.



Hyseq Diagnostics, Inc.

GeneSolutions Inc.


<PAGE>   1

                                                                    EXHIBIT 23.1


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statements
(Forms S-8 Nos. 333-41663, as amended, 333-53089, 333-53087, 333-91471, and
333-96313) pertaining to the Hyseq, Inc. 1995 Stock Option Plan, the Hyseq, Inc.
Non-Employee Director Stock Option Plan and Stock Option Agreements, the Hyseq,
Inc. Employee Stock Purchase Plan., the Hyseq, Inc. Non-Qualified Employee Stock
Purchase Plan, and the Hyseq, Inc. Scientific Advisory Board / Consultants Stock
Option Plan and Miscellaneous Option Agreements of our report dated February 2,
2000, with respect to the consolidated financial statements of Hyseq, Inc.
included in its Annual Report (Form 10-K) for the year ended December 31, 1999.



                                       /s/ ERNST & YOUNG LLP


Palo Alto, California
March 15, 2000





<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ITEM 8 OF
FORM 10-K FOR THE PERIOD ENDED DECEMBER 31, 1999 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH 10-K.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          13,675
<SECURITIES>                                    16,962
<RECEIVABLES>                                    1,250
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                32,998
<PP&E>                                          14,228
<DEPRECIATION>                                   5,801
<TOTAL-ASSETS>                                  45,364
<CURRENT-LIABILITIES>                           10,921
<BONDS>                                              0
                                0
                                          0
<COMMON>                                        82,463
<OTHER-SE>                                    (53,241)
<TOTAL-LIABILITY-AND-EQUITY>                    45,364
<SALES>                                              0
<TOTAL-REVENUES>                                 6,397
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                26,258
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,314
<INCOME-PRETAX>                               (18,547)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (18,547)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (18,547)
<EPS-BASIC>                                     (1.43)<F1>
<EPS-DILUTED>                                   (1.43)<F1>
<FN>
<F1>FOR PURPOSES OF THIS EXHIBIT, PRIMARY MEANS BASIC AND DILUTED.
</FN>


</TABLE>


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