AFFYMETRIX INC
10-Q, 1998-11-16
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                   FORM 10-Q
 
  /X/    Quarterly Report Pursuant to Section 13 or 15(d) of the
         Securities Exchange Act of 1934 for the period ended SEPTEMBER
         30, 1998
 
                                       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 No. 0-28218
 
                            ------------------------
 
                                AFFYMETRIX, INC.
 
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                                           <C>
                  DELAWARE                                     77-0319159
      (State or other jurisdiction of           (I.R.S. Employer Identification Number)
       incorporation or organization)
 
   3380 CENTRAL EXPRESSWAY, SANTA CLARA,                         95051
                 CALIFORNIA                                    (Zip Code)
  (Address of principal executive offices)
</TABLE>
 
       Registrant's telephone number, including area code: (408)731-5000
 
                            ------------------------
 
    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 / /
 
          COMMON SHARES OUTSTANDING ON SEPTEMBER 30, 1998: 22,969,917
 
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                                AFFYMETRIX, INC.
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>         <C>                                                                                              <C>
PART I.     FINANCIAL INFORMATION
 
Item 1.     Financial Statements
 
            Condensed Balance Sheets at September 30, 1998 and December 31, 1997...........................           3
 
            Condensed Statements of Operations for the Three and Nine Months Ended September 30, 1998 and
              1997.........................................................................................           4
 
            Condensed Statements of Cash Flows for the Nine Months Ended September 30, 1998 and 1997.......           5
 
            Notes to Condensed Financial Statements........................................................           6
 
Item 2.     Management's Discussion and Analysis of Financial Condition and Results of Operations..........           9
 
PART II.    OTHER INFORMATION
 
Item 1.     Legal Proceedings..............................................................................          12
 
Item 2.     Changes in Securities and Use of Proceeds......................................................          12
 
Item 6.     Exhibits and Reports on Form 8-K...............................................................          13
 
SIGNATURES.................................................................................................          14
</TABLE>
 
                                       2
<PAGE>
                         PART 1.  FINANCIAL INFORMATION
 
ITEM 1.  FINANCIAL STATEMENTS
 
                                AFFYMETRIX, INC.
                            CONDENSED BALANCE SHEET
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                       SEPTEMBER 30,   DECEMBER 31,
                                                                                           1998            1997
                                                                                       -------------   ------------
                                                                                        (UNAUDITED)
<S>                                                                                    <C>             <C>
                                                      ASSETS
Current Assets:
  Cash, cash equivalents and short-term investments..................................      $ 89,970       $ 71,573
  Accounts receivable................................................................         8,500          6,216
  Inventories........................................................................         4,177          2,637
  Other current assets...............................................................         2,232            748
                                                                                       -------------   ------------
    Total current assets.............................................................       104,879         81,174
Net property and equipment...........................................................        25,299         19,088
Other assets.........................................................................        10,771            908
                                                                                       -------------   ------------
                                                                                           $140,949       $101,170
                                                                                       -------------   ------------
                                                                                       -------------   ------------
 
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities..................................................................      $ 11,341       $  9,621
Other liabilities....................................................................         5,327            513
Convertible redeemable preferred stock...............................................        49,857        --
Stockholders' equity:
  Common stock.......................................................................       159,272        158,924
  Accumulated deficit................................................................       (85,507)       (67,269)
  Other..............................................................................           659           (619)
                                                                                       -------------   ------------
    Total stockholders' equity.......................................................        74,424         91,036
                                                                                       -------------   ------------
                                                                                           $140,949       $101,170
                                                                                       -------------   ------------
                                                                                       -------------   ------------
</TABLE>
 
- - ------------------------
 
    Note:  The balance sheet at December 31, 1997 has been derived from the
           audited financial statements at that date but does not include all of
           the information and footnotes required by generally accepted
           accounting principles for complete financial statements.
 
                            See accompanying notes.
 
                                       3
<PAGE>
                                AFFYMETRIX, INC.
                       CONDENSED STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                       THREE MONTHS ENDED     NINE MONTHS ENDED
                                                                         SEPTEMBER 30,          SEPTEMBER 30,
                                                                      --------------------  ----------------------
                                                                        1998       1997        1998        1997
                                                                      ---------  ---------  ----------  ----------
<S>                                                                   <C>        <C>        <C>         <C>
Revenue:
  Product...........................................................  $   6,492  $   1,046  $   14,941  $    2,408
  Contract..........................................................      7,178      1,891      16,788       4,709
  Grant.............................................................      1,352      2,071       4,116       5,441
                                                                      ---------  ---------  ----------  ----------
    Total Revenue...................................................     15,022      5,008      35,845      12,558
 
Costs and expenses:
  Cost of product revenue...........................................      3,496        907       9,421       2,751
  Research and development..........................................      9,702      6,725      26,154      19,804
  Selling, general and administrative...............................      8,290      3,980      20,933       9,426
                                                                      ---------  ---------  ----------  ----------
    Total costs and expenses........................................     21,488     11,612      56,508      31,981
                                                                      ---------  ---------  ----------  ----------
Loss from operations................................................     (6,466)    (6,604)    (20,663)    (19,423)
Interest income, net................................................      1,561      1,297       3,932       3,984
                                                                      ---------  ---------  ----------  ----------
Net loss............................................................     (4,905)    (5,307)    (16,731)    (15,439)
Preferred Stock dividends...........................................       (813)    --          (1,508)     --
                                                                      ---------  ---------  ----------  ----------
Loss attributable to Common Stockholders............................  $  (5,718) $  (5,307) $  (18,239) $  (15,439)
                                                                      ---------  ---------  ----------  ----------
                                                                      ---------  ---------  ----------  ----------
Basic and diluted loss per common share.............................  $   (0.25) $   (0.23) $    (0.80) $    (0.68)
                                                                      ---------  ---------  ----------  ----------
                                                                      ---------  ---------  ----------  ----------
</TABLE>
 
                            See accompanying notes.
 
                                       4
<PAGE>
                                AFFYMETRIX, INC.
                       CONDENSED STATEMENTS OF CASH FLOWS
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                 (IN THOUSANDS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                              NINE MONTHS ENDED
                                                                                                SEPTEMBER 30,
                                                                                           -----------------------
                                                                                              1998         1997
                                                                                           -----------  ----------
<S>                                                                                        <C>          <C>
Cash flows from operating activities:
  Net loss...............................................................................  $   (16,731) $  (15,439)
  Adjustments to reconcile net loss to net cash used in operating activities:
    Depreciation and amortization........................................................        3,921       1,870
    Amortization of investment premiums, net.............................................      --           --
    Change in operating assets and liabilities:
      Accounts receivable................................................................       (2,284)     (1,957)
      Inventories........................................................................       (1,540)     (1,124)
      Other current assets...............................................................         (583)       (424)
      Other assets.......................................................................          (73)       (618)
      Accounts payable and other accrued liabilities.....................................         (268)      4,124
      Deferred revenue...................................................................        1,157          13
                                                                                           -----------  ----------
        Net cash used in operating activities............................................      (16,401)    (13,555)
 
Cash flows from investing activities:
  Capital expenditures...................................................................       (9,758)    (10,284)
  Payment for acquisition of technology..................................................       (5,900)     --
  Proceeds from the sale of short-term investments.......................................      107,157      90,227
  Proceeds from maturities of short-term investments.....................................      --           12,237
  Purchases of short-term investments....................................................     (127,987)    (80,673)
                                                                                           -----------  ----------
        Net cash (used in)/provided by investing activities..............................      (36,488)     11,507
 
Cash flows from financing activities:
  Issuance of common stock...............................................................          348         134
  Issuance of Series AA Convertible redeemable preferred stock, net of costs.............       49,857      --
  Preferred stock dividends paid.........................................................         (695)     --
  Principal payments on capital lease obligation.........................................         (168)       (153)
                                                                                           -----------  ----------
        Net cash provided by/(used in) financing activities..............................       49,342         (19)
Net (decrease)/increase in cash and cash equivalents.....................................       (3,547)     (2,067)
Cash and cash equivalents at beginning of period.........................................        4,779      14,143
                                                                                           -----------  ----------
Cash and cash equivalents at end of period...............................................  $     1,232  $   12,076
                                                                                           -----------  ----------
                                                                                           -----------  ----------
 
Non cash financing activities:
Obligation related to acquisition of technology..........................................  $     5,000  $   --
                                                                                           -----------  ----------
                                                                                           -----------  ----------
</TABLE>
 
                            See accompanying notes.
 
                                       5
<PAGE>
                                AFFYMETRIX, INC.
                    NOTES TO CONDENSED FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1998
                                  (UNAUDITED)
 
NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING PRINCIPLES
 
    BASIS OF PRESENTATION
 
    The accompanying unaudited condensed financial statements have been prepared
in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Article 10 of
Regulation S-X. Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles for complete
financial statements. In the opinion of management, all adjustments (consisting
of normal recurring entries) considered necessary for a fair presentation have
been included. Operating results for the three and nine months ended September
30, 1998 are not necessarily indicative of the results that may be expected for
the year ending December 31, 1998. For further information, refer to the
financial statements and notes thereto included in the Annual Report on Form
10-K for the year ended December 31, 1997 filed by Affymetrix, Inc.
("Affymetrix" or the "Company").
 
    REVENUE RECOGNITION
 
    Contract and grant revenue includes revenue earned from services performed
pursuant to commercial collaboration and supply agreements and government
grants, and subscription fees earned under EasyAccess-TM- supply agreements.
Revenue from grants and research and development reimbursements are recorded in
the period in which the costs are incurred or in which the revenue is earned as
defined in the related agreement. Revenue from subscription fees earned under
EasyAccess-TM- supply agreements are recorded ratably over the term of the
agreement. Payments received in advance under these arrangements are recorded as
deferred revenue until earned. Direct costs associated with these contracts and
grants are reported as "research and development" expense. Product revenue is
recognized upon shipment. Reserves are provided for performance contingencies,
anticipated returns and warranty expenses at the time the associated revenue is
recognized.
 
NOTE 2--CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
 
    As of September 30, 1998, debt securities held by the Company are comprised
of U.S. Government obligations and U.S. Corporate debt securities. They are
classified as available-for-sale and are carried at fair value with unrealized
gains and losses reported in shareholders' equity.
 
NOTE 3--INVENTORIES
 
    Inventories consist of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                  SEPTEMBER 30,  DECEMBER 31,
                                                                      1998           1997
                                                                  -------------  -------------
<S>                                                               <C>            <C>
Raw material....................................................    $   2,146      $     934
Work in process.................................................           44            160
Finished goods..................................................        1,987          1,543
                                                                       ------         ------
    Total.......................................................    $   4,177      $   2,637
                                                                       ------         ------
                                                                       ------         ------
</TABLE>
 
                                       6
<PAGE>
NOTE 4--COMPREHENSIVE LOSS
 
    As of January 1, 1998, the Company adopted Statement of Financial Accounting
Standards No. 130, "Reporting Comprehensive Income" ("SFAS 130"), which
establishes standards for reporting comprehensive income and its components. The
adoption of SFAS 130 had no impact on the Company's results of operations or
financial condition.
 
    The components of comprehensive loss for the three and nine months ended
September 30, 1998 and 1997 are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                       THREE MONTHS
                                                          ENDED            NINE MONTHS ENDED
                                                      SEPTEMBER 30,          SEPTEMBER 30,
                                                   --------------------  ----------------------
                                                     1998       1997        1998        1997
                                                   ---------  ---------  ----------  ----------
<S>                                                <C>        <C>        <C>         <C>
Loss attributable to common shareholders.........  $  (5,718) $  (5,307) $  (18,239) $  (15,439)
Unrealized gain (loss) on securities.............        918        105         951          71
                                                   ---------  ---------  ----------  ----------
Comprehensive loss...............................  $  (4,800) $  (5,202) $  (17,288) $  (15,368)
                                                   ---------  ---------  ----------  ----------
                                                   ---------  ---------  ----------  ----------
</TABLE>
 
NOTE 5--CONVERTIBLE REDEEMABLE PREFERRED STOCK
 
    On April 14, 1998 the Company completed the sale of 1,634,522 shares of
Series AA Preferred Stock to Glaxo Wellcome Americas, Inc. (a wholly owned
subsidiary of Glaxo Wellcome plc) for net proceeds of approximately $49.9
million. The Preferred Stock has a cumulative, annual dividend of 6.5%. The
Preferred Stock is convertible into Affymetrix Common Stock at approximately $40
per share and is subject to redemption provisions.
 
NOTE 6--AGREEMENTS WITH BECKMAN COULTER, INC. ("BCI")
 
    In July 1998, the Company entered into a series of agreements with BCI that
will provide Affymetrix with a license to commercialize DNA arrays under certain
patents, including patents owned by or licensed to BCI, including certain
patents invented by Professor Edwin Southern of Oxford University. Under the
agreements, Affymetrix made a $5.9 million payment to BCI and agreed to provide
an additional $5.0 million in services, cash or stock to BCI over the next seven
years. In addition, Affymetrix will make royalty payments based on sales of
certain products. The payments and obligations to BCI were accounted for as the
purchase of an intangible asset which will be amortized over its estimated
useful life.
 
NOTE 7--SUBSEQUENT EVENT--ADOPTION OF STOCKHOLDER RIGHTS PLAN
 
    On October 15, 1998, the Board of Directors of the Company declared a
dividend of (i) one preferred share purchase right (a "Right") for each
outstanding share of common stock of the Company, and (ii) a number of Rights
for each share of Series AA Preferred Stock of the Company equal to the number
of shares of common stock into which such share of Series AA Preferred Stock was
convertible. The dividend is payable on October 27, 1998 (the "Record Date") to
the stockholders of record on that date. Each Right entitles the registered
holder to purchase from the Company one one-thousandth of a share of Series B
Junior Participating Preferred Stock, par value $.01 per share, of the Company
(the "Series B Preferred Stock") at a price of $125.00 per one one-thousandth of
a share of Series B Preferred Stock, subject to adjustment. The Rights will be
exercisable if a person or group hereafter acquires beneficial ownership of 15%
or more of the Common Stock of the Company or announces a tender offer for 15%
or more of the Common Stock. The Board of Directors will be entitled to redeem
the Rights at one cent per Right at any time before any such person hereafter
acquires beneficial ownership of 15% or more of the outstanding Common Stock. If
a person or group hereafter acquires 15% or more of the outstanding Common Stock
of the Company, each Right will entitle its holder to purchase, at the Right's
exercise price, a number of
 
                                       7
<PAGE>
NOTE 7--SUBSEQUENT EVENT--ADOPTION OF STOCKHOLDER RIGHTS PLAN (CONTINUED)
shares of Common Stock having a market value at that time of twice the Right's
exercise price. Rights held by the 15% holder will become void and will not be
exercisable to purchase shares at the bargain purchase price. If the Company is
acquired in a merger or other business combination transaction after a person
acquires 15% or more of the Company's Common Stock, each Right will entitle its
holder to purchase, at the Right's then-current exercise price, a number of the
acquiring company's common shares having a market value at that time of twice
the Right's exercise price. Any person currently owning in excess of 15% of the
aggregate voting power of the Common Stock and Series AA Preferred Stock will
not become an "Acquiring Person" until such person acquires beneficial ownership
of additional shares of Common Stock. The Rights will expire in ten years.
 
                                       8
<PAGE>
ITEM 2.  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 as of September 30, 1998 and for the three month periods ended
September 30, 1998 and 1997 should be read in conjunction with the Management's
Discussion and Analysis of Financial Condition and Results of Operations
included in the Company's Annual Report on Form 10-K for the year ended December
31, 1997.
 
    All statements in this discussion that are not historical are
forward-looking statements within the meaning of Section 21E of the Securities
Exchange Act, including statements regarding the Company's "expectations",
"beliefs", "hopes", "intentions", "strategies" or the like. Such statements are
subject to risks and uncertainties that could cause actual results to differ
materially for Affymetrix from those projected, including, but not limited to,
uncertainties relating to technological approaches, product development,
manufacturing and market acceptance, uncertainties related to cost and pricing
of Affymetrix products, dependence on collaborative partners, uncertainties
relating to sole source suppliers, uncertainties relating to FDA and other
regulatory approvals, competition, risks relating to intellectual property of
others and the uncertainties of patent protection and litigation. These and
other risk factors are discussed in Affymetrix' Annual Report on Form 10-K for
the year ended December 31, 1997. Affymetrix expressly disclaims any obligation
or undertaking to release publicly any updates or revisions to any
forward-looking statements contained herein to reflect any change in Affymetrix'
expectations with regard thereto or any change in events, conditions, or
circumstances on which any such statements are based.
 
OVERVIEW
 
    Affymetrix, Inc. has developed and intends to establish its
GeneChip-Registered Trademark- system as the platform of choice for acquiring,
analyzing and managing complex genetic information in order to improve the
diagnosis, monitoring and treatment of disease. The Company's GeneChip system
consists of disposable DNA probe arrays containing gene sequences on a chip,
reagents for use with the probe arrays, a scanner and other instruments to
process the probe arrays, and software to analyze and manage genetic
information.
 
    The business and operations of the Company were commenced in 1991 by Affymax
N.V. ("Affymax") and were initially conducted within Affymax. In March 1992, the
Company was incorporated as a California corporation and wholly owned subsidiary
of Affymax and in September 1998 was reincorporated as a Delaware corporation.
Beginning in September 1993, the Company issued equity securities which diluted
Affymax' ownership in Affymetrix. In March 1995, Glaxo plc, now Glaxo Wellcome
plc ("Glaxo"), acquired Affymax, including its ownership interest in Affymetrix.
On April 14, 1998 the Company completed the sale of 1,634,522 shares of Series
AA Preferred Stock to Glaxo Wellcome Americas, Inc. (a wholly owned subsidiary
of Glaxo) for net proceeds of approximately $49.9 million. The Preferred Stock
is convertible into Affymetrix Common Stock at approximately $40 per share.
Glaxo's acquisition of the Series AA Preferred Stock increased Glaxo's
beneficial ownership of Affymetrix to approximately 37%.
 
RESULTS OF OPERATIONS
 
    THREE MONTHS AND NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
 
    Product revenue was $6.5 million and $14.9 million for the three and nine
months ended September 30, 1998, respectively, compared to $1.0 million and $2.4
million in the three and nine months ended September 30, 1997. The increases
resulted from growth in placements of GeneChip systems and the accompanying
sales of GeneChip probe arrays and related products. Contract revenue was $7.2
million and $16.8 million for the three and nine months ended September 30,
1998, respectively, compared to $1.9 million and $4.7 million in the three and
nine months ended September 30, 1997. The increases in commercial contract
revenue resulted principally from fees earned under the Company's EasyAccess-TM-
 
                                       9
<PAGE>
subscription-based supply agreements and achievement of milestones under other
commercial contracts, including revenue of $2.0 million earned from the
completion of a custom chip project in September 1998. Grant revenue was $1.4
million and $4.1 million for the three and nine months ended September 30, 1998,
respectively, compared to $2.1 million and $5.4 million in the three and nine
months ended September 30, 1997. The decreases are primarily due to lower
activity under government grants including grants from the Advanced Technology
Program and NIH National Center for Human Genome Research. The Company expects
grant revenues to fluctuate in the future due to the level of activity performed
under the grants and the timing of certain grant revenue billings.
 
    Cost of product revenue was $3.5 million and $9.4 million for the three and
nine months ended September 30, 1998, respectively, compared to $0.9 million and
$2.8 million for the three and nine months ended September 30, 1997. The Company
has experienced, and continues to experience, variation in the manufacturing
yield of its GeneChip products which has impacted, and will continue to impact,
the Company's ability to meet its commitments to deliver product to its
customers in a timely manner. Difficulty in providing timely delivery of
products adversely affects the Company's relationships with its customers, its
business, its financial condition and results of operations. Margins have
fluctuated, and will continue to fluctuate significantly, as a result of
variation in manufacturing yields and as the Company continues development of
its manufacturing capabilities, including the start-up of the planned West
Sacramento, California facility. Margins also fluctuate as a result of changes
in the mix of products sold. In addition, the Company sells products in certain
foreign countries and thus revenue and margins will fluctuate due to changes in
currency exchange rates. However, the impact of changing currency rates to date
has been immaterial and the Company does not engage in hedging activities.
 
    Research and development expenses were $9.7 million and $26.2 million for
the three and nine months ended September 30, 1998, respectively, compared to
$6.7 million and $19.8 million the three and nine months ended September 30,
1997. The increase in research and development expenses was attributable
primarily to the hiring of additional research and development personnel and
associated purchases of research supplies. The Company expects research and
development spending to increase over the next several years as product
development and core research efforts continue to expand.
 
    Selling, general and administrative expenses were $8.3 million and $20.9
million for the three and nine months ended September 30, 1998, respectively,
compared to $4.0 million and $9.4 million the three and nine months ended
September 30, 1997. The increase in selling, general and administrative expenses
resulted primarily from the Company's expansion of commercial activities and
significantly increased legal costs arising from the Company's ongoing patent
litigation. Selling, general and administrative expenses are expected to
continue to increase as the Company expands sales and marketing, prosecutes and
defends its intellectual property position and defends against claims made by
third parties, and adds management and support staff. In particular, the Company
expects legal costs to increase over the next several months as ongoing patent
litigation with Hyseq, Inc. and with Incyte Pharmaceuticals, Inc. and Synteni,
Inc. approach their respective trial dates.
 
    Net interest income was $1.6 million and $3.9 million for the three and nine
months ended September 30, 1998, respectively, compared to $1.3 million and $4.0
million the three and nine months ended September 30, 1997. The fluctuations in
net interest income result principally from variation in the Company's
short-term investment balances.
 
    IMPACT OF YEAR 2000
 
    The Company has begun to assess the potential impact of the Year 2000
computer problem on its products (including GeneChip systems and software),
information systems, embedded systems (including computers used in its
manufacturing process) and on the ability of certain third parties to supply
critical materials and services. The Company has completed the assessment of its
products and believes them to be Year 2000 ready. The Company expects to
complete the assessment of its computer systems, embedded systems, certain third
party suppliers and major customers by the first quarter of 1998, and to take
 
                                       10
<PAGE>
necessary remediation action by the end of 1999. Expenditures to date have not
been material and have consisted solely of the limited use of outside
consultants and the time of certain company personnel. Based on the partial
assessment completed through September 30, 1998, the Company does not currently
expect the future costs of completing the assessment, making system
modifications, purchasing replacement computer systems and assessing the Year
2000 readiness of material third party suppliers and major customers to be
material. While the Company does not anticipate a material business interruption
to result from the Year 2000 problem, the Company gives no assurances that its
systems will be Year 2000 ready and the Company cannot guarantee the Year 2000
readiness of key third party suppliers and service providers and major
customers. Pending the completion of the assessment of the Company's Year 2000
readiness, the Company may make certain contingency plans (for example the
stockpile of critical raw materials in late 1999), but currently such plans have
not been developed. If any of the Company's computer systems, embedded systems,
key third party suppliers and services providers and major customers are not
Year 2000 ready, the Company may experience a business interruption which would
have a material adverse impact on the Company's results of operations and
financial condition.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    As of September 30, 1998, the Company's cash, cash equivalents, and
short-term investments were $90.0 million compared to $71.6 million at December
31, 1997. The increase is primarily attributable to the proceeds from the
issuance of Series AA Preferred Stock partially offset by cash used to fund the
Company's operating loss and capital expenditures for expansion of manufacturing
capacity.
 
    Net cash used in operating activities was $16.4 million for the nine months
ended September 30, 1998, as compared to $13.6 million for the nine months ended
September 30, 1997. The increase in net cash used in operating activities
resulted primarily from increases in the Company's net loss and changes in
operating assets and liabilities.
 
    The Company's investing activities, other than purchases, sales and
maturities of available-for-sale securities, consisted of capital expenditures,
which totaled $9.8 million for the nine months ended September 30, 1998 and
$10.3 million for the nine months ended September 30, 1997. Capital expenditures
during the first nine months of 1998 included investments in land, facilities,
and production and laboratory equipment. The Company expects to spend an
additional $5 million to $10 million over the next year to complete the new
manufacturing facility in West Sacramento, California. Also included in
investing activities is a $5.9 million payment made to Beckman Coulter, Inc.
("BCI") under the terms of a series of agreements with BCI that will provide
Affymetrix with a license to commercialize DNA arrays under certain patents
owned by or licensed to BCI, including certain patents invented by Professor
Edwin Southern of Oxford University. Under the agreements, Affymetrix will also
provide services and make certain future payments to BCI and will pay royalties
on sales of certain products.
 
    Financing activities for the nine months ended September 30, 1998, include
net proceeds of $49.9 million from the issuance of Series AA Preferred Stock and
cash dividends paid on the Series AA Preferred Stock of $0.7 million.
 
    The Company anticipates that its existing capital resources will enable it
to maintain currently planned operations and planned capital expenditures
through at least 2000. However, this expectation is based on the Company's
current operating plan and capital expenditure plan, which could change, and
therefore the Company could require additional funding sooner than anticipated.
In addition, the Company expects its capital requirements to increase over the
next several years as it expands its facilities and acquires scientific
equipment to support expanded manufacturing and research and development
efforts. The Company's long-term capital expenditure requirements will depend on
numerous factors, including: the progress of its research and development
programs; initiation or expansion of research programs; the development of
commercial scale manufacturing capabilities; its ability to maintain existing
collaborative and customer arrangements and establish and maintain new
collaborative and customer arrangements; the costs involved in preparing,
filing, prosecuting, defending and enforcing intellectual property rights; the
effectiveness of product commercialization activities and arrangements; the
purchase of patent licenses; and other factors.
 
                                       11
<PAGE>
PART II.  OTHER INFORMATION
 
ITEM 1.  LEGAL PROCEEDINGS
 
    On August 18, 1998 the Company filed a lawsuit in Federal District Court in
the Northern District of California against Hyseq, Inc. ("Hyseq") alleging
infringement of U.S. Patent Nos. 5,795,716 and 5,744,305 ('305). Hyseq had
previously filed lawsuits alleging infringement by Affymetrix of U.S. Patent
Nos. 5,202,231; 5,525,464; and 5,695,940. On September 1, 1998 the Company added
U.S. Patent No. 5,800,992 ('992) to the complaint of infringement against Hyseq.
 
    Also on September 1, 1998, the Company filed a complaint against Synteni,
Inc. ("Synteni") and Incyte Pharmaceuticals, Inc. ("Incyte") in Federal District
Court in Delaware alleging infringement of the '305 Patent and the '992 Patent.
Earlier, in January 1998, the Company sued Synteni and Incyte asserting
infringement of U.S. Patent No. 5,445,934. On September 21, 1998, Incyte and
Synteni filed an answer asserting various defenses to the lawsuit, and asserted
several counterclaims including a request for declaration of noninfringement and
invalidity, an assertion of unfair competition, a request for a declaration that
Synteni and Dari Shalon (an employee of Synteni) have not misappropriated any of
Affymetrix' trade secrets, a claim of tortuous interference with Incyte and
Synteni's economic advantage, and a claim of trade libel. Affymetrix believes
these counterclaims are without merit. The actions by Affymetrix against Incyte,
Synteni, and Hyseq seek to enjoin commercial activities relating to the
Affymetrix patents as well as to obtain damages and attorneys' fees. In
connection with the assertion of infringement against Incyte and Synteni,
Affymetrix filed a request for preliminary injunction against Incyte and
Synteni.
 
    There can be no assurance that Affymetrix will prevail in such litigation
activities or be successful in asserting its patent rights. The Company is
likely to incur substantial costs and expend substantial personnel time in
asserting the Company's patent rights against Hyseq, Incyte, and Synteni and
defending against counterclaims filed by Hyseq, Incyte, and Synteni. Failure to
successfully enforce its patent rights or defend against counterclaims, or the
loss of these patent rights or others would remove a legal obstacle to
competitors in designing systems with similar competitive advantages, which
could have a material adverse effect on the Company's business, financial
condition and operating results.
 
ITEM 2.  CHANGES IN SECURITIES AND USE OF PROCEEDS
 
    On October 15, 1998, the Board of Directors of the Company declared a
dividend of (i) one preferred share purchase right (a "Right") for each
outstanding share of common stock of the Company, and (ii) a number of Rights
for each share of Series AA Preferred Stock of the Company equal to the number
of shares of common stock into which such share of Series AA Preferred Stock was
convertible. The dividend is payable on October 27, 1998 (the "Record Date") to
the stockholders of record on that date. Each Right entitles the registered
holder to purchase from the Company one one-thousandth of a share of Series B
Junior Participating Preferred Stock, par value $.01 per share, of the Company
(the "Series B Preferred Stock") at a price of $125.00 per one one-thousandth of
a share of Series B Preferred Stock, subject to adjustment. The Rights will be
exercisable if a person or group hereafter acquires beneficial ownership of 15%
or more of the Common Stock of the Company or announces a tender offer for 15%
or more of the Common Stock. The Board of Directors will be entitled to redeem
the Rights at one cent per Right at any time before any such person hereafter
acquires beneficial ownership of 15% or more of the outstanding Common Stock. If
a person or group hereafter acquires 15% or more of the outstanding Common Stock
of the Company, each Right will entitle its holder to purchase, at the Right's
exercise price, a number of shares of Common Stock having a market value at that
time of twice the Right's exercise price. Rights held by the 15% holder will
become void and will not be exercisable to purchase shares at the bargain
purchase price. If the Company is acquired in a merger or other business
combination transaction after a person acquires 15% or more of the Company's
Common Stock, each Right will entitle its holder to purchase, at the Right's
then-current exercise price, a number of the acquiring company's common shares
having a market value at that time of twice the Right's exercise price. Any
person currently owning in excess of 15%
 
                                       12
<PAGE>
of the aggregate voting power of the Common Stock and Series AA Preferred Stock
will not become an "Acquiring Person" until such person acquires beneficial
ownership of additional shares of Common Stock. The Rights will expire in ten
years.
 
    On June 6, 1996, a Registration Statement on Form S-1 (No. 333-3648) was
declared effective by the Securities and Exchange Commission, pursuant to which
6,153,000 shares of the Company's Common Stock, no par value, were offered and
sold for the account of the Company at a price of $15.00 per share, generating
gross offering proceeds of $92.3 million for the account of the Company. The
managing underwriters for the offering were Robertson Stephens, CS First Boston
and Montgomery Securities.
 
    From the effective date of the Registration Statement to September 30, 1998,
the Company incurred $6.2 million in underwriting discounts and commissions and
$1.0 million in other related expenses. Total expenses incurred in connection
with the offering were $7.2 million. The net proceeds of the offering, after
deducting the foregoing expenses, were $85.1 million. No direct or indirect
payments were made to directors, officers, or general partners of the Company or
their associates, or to persons owning 10% or more of any class of equity
securities of the Company and its affiliates.
 
    From the effective date of the Registration Statement to September 30, 1998,
the Company estimates that it has used the net proceeds of the offering as
follows: (i) temporary investment in marketable debt securities, $40.1 million;
and (ii) working capital, $45.0 million.
 
ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K
 
    (a) Exhibits:
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                   DESCRIPTION OF DOCUMENT
- - -----------  ------------------------------------------------------------------------------------
<S>          <C>
     10.34*  Consortium Agreement between Beckman Coulter, Inc. and Affymetrix dated July 31,
               1998.
 
     10.35   Letter Agreement between Beckman Coulter, Inc. and Affymetrix dated July 29, 1998.
 
        27   Financial data schedule.
</TABLE>
 
- - ------------------------
 
*   Confidential treatment requested.
 
    (b) Reports on Form 8-K.
 
    On September 29, 1998, the Company filed a Report on Form 8-K announcing
that it had changed its state of incorporation from California to Delaware.
 
                                       13
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of 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.
 
November 16, 1998
 
<TABLE>
<S>                             <C>  <C>
                                AFFYMETRIX, INC.
 
                                By:            /s/ EDWARD M. HURWITZ
                                     -----------------------------------------
                                                 Edward M. Hurwitz
                                     VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                                        (PRINCIPAL FINANCIAL AND ACCOUNTING
                                                      OFFICER)
</TABLE>
 
                                       14
<PAGE>
                                AFFYMETRIX, INC.
                                 EXHIBIT INDEX
                               SEPTEMBER 30, 1998
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                             DESCRIPTION OF DOCUMENT
- - -----------  --------------------------------------------------------------------------------------------------------
<S>          <C>
    10.34*   Consortium Agreement between Beckman Coulter, Inc. and Affymetrix dated July 31, 1998.
 
     10.35   Letter Agreement between Beckman Coulter, Inc. and Affymetrix dated July 29, 1998.
 
        27   Financial data schedule.
</TABLE>
 
- - ------------------------
 
*   Confidential treatment requested.

<PAGE>
                              CONSORTIUM AGREEMENT
 
    CONSORTIUM AGREEMENT effective this   day of            , 1998 by and
between BECKMAN COULTER, INC., a Delaware corporation, having a place of
business at 4300 North Harbor Boulevard, Fullerton, California 92834-3100
("BCI") and AFFYMETRIX, INC., a             corporation, having a place of
business at 3380 Central Expressway, Santa Clara, California 95051
("Affymetrix").
 
                                R E C I T A L S
 
  I. Affymetrix is in the business of developing, manufacturing and selling
     Array Chips (as that term is hereinafter defined), and has proprietary
     technology and intellectual property relative to the making and using of
     Array Chips and instruments for using and reading Array Chips.
 
 II. BCI is in the business of developing, manufacturing and selling automated
     instruments systems for the bioresearch and human clinical diagnostic
     markets. BCI has developed technology relating to the manufacture of Array
     Chips and has access to proprietary chemistry used in the preparation of
     oligomers. BCI also has proprietary technology which can be applied to
     automating processes which use Array Chips.
 
 III. The parties agree to cooperate, each with the other, to develop Array
      Chips and systems for using Array Chips, to accelerate market acceptance,
      uses and applications of Array Chips and to develop and commercialize
      Array Chip products, processes and systems.
 
    NOW THEREFORE in consideration of the mutual undertakings contained herein
and other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the parties, intending to be legally bound, agree as
follows:
 
                 ARTICLE 1.0  INTENT OF PARTIES AND DEFINITION
 
    The intent of the parties is to cooperate to accelerate market acceptance,
applicability and use of Array Chips in the bioresearch and diagnostics markets.
To this end, the parties will enter and execute the various agreements and
relationships contemplated by this Agreement and use their individual strengths,
collectively, to jointly develop individual arrays, and instruments and systems
for processing and using arrays. This Agreement shall be construed in accordance
with this intent.
 
    For purposes of this Agreement the term "Array Chip" shall mean a series of
polynucleotides arranged in an array on a substrate to perform quantitative or
qualitative analyses.
 
              ARTICLE 2.0  RESEARCH AND DEVELOPMENT OF ARRAY CHIPS
 
    AFFYMETRIX RESEARCH ON BEHALF OF BCI--Affymetrix shall, in accordance with
attached Exhibit A, perform Five Million Dollars ($5,000,000) in contract
research and development services for and under the direction of BCI on Array
Chip technology and products of interest to BCI.
 
           ARTICLE 3.0  SYSTEMS FOR USING AND PROCESSING ARRAY CHIPS;
                             COMMERCIAL COOPERATION
 
 3.1 IMMEDIATE OBJECTIVES--Affymetrix shall, within       (   ) days of the
     signing of this Agreement complete and implement the design modifications
     of the scanners and other instruments and systems it currently sells for
     use with Array Chips to efficiently and effectively interact with BCI's
     [            ].(1)
 
- - ------------------------
 
(1) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
 
                                       1
<PAGE>
 3.2 LONG TERM OBJECTIVES--Subject to Paragraph 3.4, Affymetrix, for its part,
     agrees that it will use reasonable commercial efforts consistent with
     commercial opportunity to assure any scanners, instruments and systems it
     hereafter sells and promotes during the ten (10) years following the
     effective date of this Agreement will, at the time of first commercial
     sale, be configured and adapted to efficiently and effectively interact
     with BCI's then current laboratory information and management system. BCI,
     for its part, agrees during the aforesaid term to keep Affymetrix informed
     of its developments in laboratory information and management systems and of
     the modifications required in Affymetrix' scanners, instruments and systems
     to facilitate use with BCI's laboratory information and management systems.
 
 3.3 BCI AS A PREFERRED SYSTEM PROVIDER--Subject to Paragraph 3.4, Affymetrix
     shall, during the ten (10) years following the effective date of this
     Agreement use commercially reasonable efforts to actively promote BCI, with
     Affymetrix' customers, as the preferred source for systems integration and
     laboratory information and management systems and products. Included within
     such promotion, by way of example only and not limitation, shall be (a)
     Affymetrix, at least once each calendar quarter, providing to BCI, a list
     of customers to whom it has sold an Affymetrix scanner or instrument or
     similar system for using or processing Array Chips in the preceding three
     (3) months, such list to include the name and address of the customer, the
     identity of a key contact and the type or model of Affymetrix scanner,
     instrument or system sold; the foregoing information shall only be used by
     BCI to promote the sale of its laboratory information and management
     systems, products and services; (b) semi-annual meetings between the
     relevant marketing and sales management of Affymetrix and BCI to develop,
     execute and administer co-marketing and promotional plans for Array Chips;
     scanners, instruments and systems which use and process Array Chips;
     systems which automate processing of Array Chips; and, market
     opportunities, uses and applications for Array Chips; and, (c) each party
     (a "first party") permitting the other party (a "second party") to use the
     first party's trademarks and depictions of its products in marketing and
     promotional literature; such second party literature to be subject to the
     first party's review and approval, not to be unreasonably, withheld or
     delayed, prior to release by such second party.
 
 3.4 The ten (10) year term for cooperation and collaboration in Paragraphs 3.2
     and 3.3 shall be extended thereafter, from year to year, unless either
     party provides written notice to the other party at least ninety (90) days
     prior to the expiration of the ten (10) year term or any anniversary
     thereof, of its intention to terminate such cooperation.
 
              ARTICLE 4.0  ARRAY CHIP MANUFACTURE AND DISTRIBUTION
 
    Affymetrix and BCI will enter the agreement attached hereto as Exhibit B for
the OEM manufacture by Affymetrix and the sale by BCI of Array Chips for use on
instruments and systems manufactured or distributed by BCI.
 
                 ARTICLE 5.0  EXCHANGE OF INTELLECTUAL PROPERTY
 
 5.1 BCI LICENSE TO AFFYMETRIX--BCI and Affymetrix shall enter into the license
     agreement attached hereto as Exhibit C for the license by BCI to Affymetrix
     of the BCI Array Chip making technology and intellectual property set forth
     in Exhibit C.
 
 5.2 AFFYMETRIX LICENSE TO BCI--BCI and Affymetrix shall enter into the license
     agreement attached hereto as Exhibit D for the license by Affymetrix to BCI
     of the Affymetrix Array Chip making and using technology and intellectual
     property.
 
 5.3 COOPERATION TO OBTAIN LICENSE UNDER SOUTHERN PATENTS--BCI agrees to and
     shall, promptly after the signing of this Agreement, make a written request
     to Oxford Gene Technology ("OGT"), in accordance with Section 9.2 of that
     certain Patent License Agreement between Beckman Instruments, Inc. and Isis
     Innovation Limited, to grant Affymetrix a non-exclusive, world-wide license
 
                                       2
<PAGE>
     under U.S. Patents 5,436,327 and 5,700,637 and each of their foreign
     counterparts (the "Southern Patents") on reasonable terms and conditions.
     BCI further agrees to use commercially reasonable efforts to require OGT to
     comply with its obligations under such Section. For purposes of this
     Paragraph 4.3 it is understood that commercially reasonable efforts does
     not require litigation or the bringing of a lawsuit by BCI. If the
     foregoing BCI efforts do not result in the grant of a license to Affymetrix
     under the Southern Patents [            ](2) from the date of the BCI
     letter to OGT then the parties agree to consult and cooperate with each
     other to explore alternatives available to effectuate the intent of this
     Paragraph and to further the goals of the parties to commercialize Array
     Chips.
 
 5.4 PAYMENT TO BCI--Affymetrix shall, not later than five (5) business days
     after obtaining the license under the Southern Patents from OGT, or any
     successor in interest, pay to BCI the sum of Five Million Dollars
     ($5,000,000).
 
                    ARTICLE 6.0  EXCLUSIVITY ON BCI SYSTEMS
 
    Affymetrix will not knowingly, after exercising due caution, care and
diligence, and undertaking reasonable inquiry, sell any of its Array Chips to an
end user who will use such Array Chips on an instrument, system or device
manufactured or distributed by BCI. Similarly, Affymetrix will proactively and
regularly inform each of its dealers and distributors of Affymetrix Array Chips
that such Array Chips should not be sold to end users who will use such Array
Chips on an instrument, system or device manufactured or distributed by BCI. For
the avoidance of doubt, BCI's instruments, systems and devices, as those terms
are used in this Article 6.0 does not include SAMI? or SILAS? products or
services.
 
           ARTICLE 7.0  ADDITION OF HEWLETT PACKARD TO THE CONSORTIUM
 
    It is the express intention of the parties to enter into good faith
negotiations with Hewlett Packard Company ("HP") to make HP part of this
Agreement. The execution of this intention is subject to the following
understandings: (a) HP will OEM manufacture Array Chips for Affymetrix and BCI
on reasonable terms and conditions, (b) any monetary consideration paid by HP to
joint the consortium or for the rights provided under Paragraph 5.3 hereof will
be paid to and retained by BCI, and (c) any running royalties will be paid to
and retained by Affymetrix.
 
                       ARTICLE 8.0  TRANSFER OF INTEREST
 
    Neither party may assign this Agreement or the rights set forth herein
without the prior written consent of the other party; provided that
[            ](3)
 
                           ARTICLE 9.0  MISCELLANEOUS
 
 9.1 ENTIRE AGREEMENT; BINDING PROVISIONS; SEPARABILITY--Except as to the side
     letter from BCI to Affymetrix of even date herewith, this Agreement
     constitutes the entire agreement between the parties pertaining to its
     subject matter and fully supersedes any and all prior agreements or
     understandings between the parties pertaining to such subject matter. The
     covenants and agreements contained in this Agreement shall be binding upon,
     and inure to the benefit of, the heirs, executors, administrators, personal
     representatives, successors and permitted assigns of the respective parties
     hereto. Each provision of this Agreement shall be considered separable,
     and, if for any reason any provision or provisions hereof are determined to
     be invalid or contrary to any existing or future law, such invalidity shall
     not impair the operation of effect of those portions of this Agreement that
     are valid.
 
- - ------------------------
 
 (2) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
     SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
 
 (3) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
     SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
 
                                       3
<PAGE>
 9.2 FURTHER ASSURANCES--Each of the parties hereto does hereby covenant and
     agree on behalf of itself, its successors and its assigns, without further
     consideration, to prepare, execute, acknowledge, file, record, publish and
     deliver such other instruments, documents and statements, and to take such
     other action as may be required by law or necessary to effectively carry
     out the purposes of this Agreement.
 
 9.3 NOTICES--Any notice, consent, payment, demand or communication required or
     permitted to be given by any provision of this Agreement shall be in
     writing and shall be (a) delivered personally to the party or to an officer
     of the party to whom the same is directed, or (b) sent by facsimile or
     registered or certified mail, return receipt requested, postage prepaid
     addressed as follows:
 
BCI:              Beckman Coulter, Inc.
                  4300 North Harbor Boulevard
                  Fullerton, California 92834-310
                  0 Attention:  President
 
with a copy to:   Beckman Coulter, Inc.
                  4300 North Harbor Boulevard
                  Fullerton, California 92834-3100
                  Attention:  General Counsel
 
Affymetrix:       Affymetrix, Inc.
                  3380 Central Expressway
                  Santa Clara, California 95051
                  Attention:  President
 
with a copy to:   Affymetrix, Inc.
                  3380 Central Expressway
                  Santa Clara, California 95051
                  Attention:  General Counsel
 
       Any such notice shall be deemed to be delivered, given and received for
       all purposes as of (i) the date so delivered, if delivered personally,
       (ii) upon receipt, if sent by facsimile with confirmation of receipt in
       good order requested and received, or (iii) on the date of receipt or
       refusal indicated on the return receipt, if sent by registered or
       certified mail, return receipt requested, postage prepaid, and properly
       addressed.
 
 9.4 GOVERNING LAW--This Agreement, including its existence, validity,
     construction and operating effect, and the right of each of the parties
     hereto, shall be governed by and construed in accordance with the laws of
     the State of California.
 
 9.5 AMENDMENTS--No amendments to this Agreement shall be effective without the
     prior written approval of all parties, which approval may be given or
     withheld in the sole and absolute discretion of a party.
 
 9.6 COUNTERPARTS--This Agreement may be executed in any number of multiple
     counterparts, each of which shall be deemed to be an original copy and all
     of which together shall constitute one agreement, binding on all parties
     hereto.
 
 9.7 TITLES; PRONOUNS--Article and Paragraph titles are for descriptive purposes
     only and shall not control or alter the meaning of this Agreement as set
     forth in the text. All pronouns and variations thereof shall be deemed to
     refer to the masculine, feminine, neuter, singular or plural, as
     appropriate.
 
 9.8 RELATIONSHIP--It is not the intention of the parties that this Agreement
     create a partnership or association. Neither party is granted any right or
     authority hereunder to assume or create any
 
                                       4
<PAGE>
     obligation, express or implied, or to make any representations, warranties
     or guarantees on behalf or in the name of the other party.
 
    IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement
effective as of the last date written below.
 
<TABLE>
<S>                             <C>    <C>
                                BECKMAN COULTER, INC.
                                a Delaware corporation
 
                                By:    /s/ John Wareham
                                       ---------------------------------------
 
                                Its:   Chief Executive Officer
                                       ---------------------------------------
 
                                Date:  July 31, 1998
                                       ---------------------------------------
 
                                AFFYMETRIX, INC.
                                a             corporation
 
                                By:    /s/ Stephen P.A Fodor
                                       ---------------------------------------
 
                                Its:   President and Chief Executive Officer
                                       ---------------------------------------
 
                                Date:  July 31, 1998
                                       ---------------------------------------
</TABLE>
 
                                       5
<PAGE>

                                          Exhibit A to the Consortium Agreement
                                                      dated as of July 31, 1998



                                    July 31, 1998



Mr. Steve Fodor, President
Affymetrix, Inc.
3380 Central Expressway
Santa Clara, California 95051


Dear Mr. Fodor:

This letter, with your signature below, will serve as the outline for 
agreements to be hereafter negotiated under which Affymetrix, Inc. 
("Affymetrix") has granted Beckman Coulter, Inc. ("BCI") a credit of 
$5,000,000 to be applied against contract research and development services 
to be performed by Affymetrix on array chip technology and products of 
interest to BCI.  In addition to other terms and conditions acceptable to the 
parties, the agreements will contain the following:

1.   BCI will identify the array chip technology or products of interest (the
     "Services").  There may be more than one set of Services.  Each set of
     Services will be embodied in a separate agreement.  Unless Affymetrix is
     blocked by a pre-existing agreement with a third party, it will perform the
     Services requested by BCI.
     
2.   Prior to commencing a set of Services, the parties will agree on, and
     embody in the respective agreement, a budget and milestones and a proposed
     completion date for such Services.
     
3.   Affymetrix will charge against the credit of $5,000,000 on a time and
     material basis using billing and overhead rates for the employees utilized
     which are at least as favorable as those charged internally by Affymetrix
     for its own research and development activities.
     
4.   Affymetrix will use reasonable commercial efforts to complete the services.
     
5.   BCI will own inventions and know-how generated by Affymetrix in the
     performance of the Services.  BCI will grant licenses to Affymetrix, on
     reasonable terms and 

                                     -1-

<PAGE>

     conditions to be hereafter negotiated, to use such patents and know-how on
     array chips which do not directly compete with array chips distributed by 
     BCI.

6.   If the parties do not sign an agreement for Services embodying the
     understandings of this letter within five (5) years of the above date, then
     Affymetrix, at its option, will either pay BCI $5,000,000 or give BCI
     shares of Affymetrix stock having a value of $5,000,000. If Affymetrix
     elects to give BCI shares of Affymetrix stock, such shares shall be 
     registered and fungible on receipt by BCI.  If Affymetrix does not
     perform or agree to perform Services for BCI having a value of at least
     $5,000,000 within seven (7) years of the above date, then Affymetrix will,
     at its option, either pay BCI the difference between $5,000,000
     and the value of Services performed or agreed to be performed on such
     fifth (5th) anniversary or give BCI shares of Affymetrix stock of the value
     of such difference; such shares shall be registered and fungible by BCI on
     receipt.
     
     If the foregoing properly sets forth our intent, please sign both copies of
this letter in the space indicated and return one copy to me; the second copy is
for your files.


                                   Very truly yours,

                                   Beckman Coulter, Inc.


                                   by:
                                      -------------------------------
                                   title:
                                         ----------------------------


Understood and Accepted:

Affymetrix, Inc.


by:
   ------------------------------

title:
      ---------------------------


                                      -2-

<PAGE>

                                          Exhibit B to the Consortium Agreement
                                                      dated as of July 31, 1998


                                OEM SUPPLY AGREEMENT


     OEM SUPPLY AGREEMENT ("Agreement") effective this _____ day of _____ 1998
by and between AFFYMETRIX, INC. a California corporation, having a place of
business at 3380 Central Expressway, Santa Clara, California 95051
("Affymetrix", as that term is further defined in Paragraph 1.2 hereof) and
BECKMAN COULTER, INC., a Delaware corporation, having a place of business at
4300 North Harbor Boulevard, Fullerton, California 92834-3100 ("BCI", as that
term is further defined in Paragraph 1.4 hereof).

                                          
                                  R E C I T A L S 


I.   Affymetrix is in the business of developing, manufacturing and selling
     Array Chips (as that term is hereinafter defined).
     

II.  BCI desires to purchase Array Chips from Affymetrix for resale to BCI
     customers.
     

     NOW THEREFORE, in consideration of the mutual covenants and undertakings
contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties, intending to be
legally bound, agree as follows:


                             ARTICLE 1.0   DEFINITIONS

     The following terms, when used herein with an initial capital letter and
without regard to whether they appear in the singular, plural or possessive
form, shall have the following defined meanings:
     

1.1  "AFFILIATE" shall mean any corporation or other form of limited liability
     legal person, partnership, association,  joint venture or other form of
     business entity controlled by, 

                                      -1-

<PAGE>

     controlling or under common control with a party hereto.  As used herein,
     the word and root "control" in the context of a corporation shall mean 
     the ownership, directly or indirectly, of more than fifty percent (50%) 
     of the voting shares or other  equity interests entitled to vote in the 
     election of directors of the corporation; and, in the context of any 
     other form of business entity, the right to receive more than fifty 
     percent (50%) of the net profits of such entity and the right to a 
     majority interest in the management and control of such entity; provided
     that notwithstanding the foregoing definition, BCI may not have as an
     Affiliate entitled to receive the benefits of the licenses granted under
     Section 3.1 hereof (a) a corporation wherein any of the companies listed in
     Exhibit A is more than a passive investor in such Affiliate and such
     passive investor does not have the right to manage or control such
     Affiliate or (b) a partnership wherein any of the companies listed in
     Exhibit A is a partner.
     

1.2  "AFFYMETRIX" shall mean Affymetrix, Inc., its divisions and Affiliates and
     its and their permitted successors and assigns.
     

1.3  "ARRAY CHIPS" shall mean a series of polynucleotides arranged
     on a substrate to perform quantitative or qualitative analyses.
     

1.4  "BCI" shall mean Beckman Coulter, Inc., its divisions and Affiliates and
     its and their permitted successors and assigns.
     

1.5  "BCI SYSTEM" shall mean an instrument, device or system manufactured or
     distributed by BCI which uses Array Chips to perform quantitative or
     qualitative analyses.  For the avoidance of doubt, if an instrument, device
     or system is manufactured by a third party and distributed by BCI only
     those specific instruments, devices or systems which are sold or leased or
     otherwise distributed to end users (directly or indirectly) by BCI are BCI
     Systems and the identical instrument, device or system which is sold,
     leased or otherwise distributed directly to the end user by the
     manufacturer or indirectly from the manufacturer to a third party and then
     to the end user are not BCI Systems.

                                     -2-

<PAGE>

1.6  "PRODUCT" shall mean an Array Chip manufactured by Affymetrix and sold to
     BCI under the terms of this Agreement.


               ARTICLE 2.0   IDENTIFICATION OF ARRAY CHIPS AS PRODUCTS


2.1  IDENTIFICATION OF ARRAY CHIPS BY AFFYMETRIX - Affymetrix shall, from time
     to time, notify BCI, in writing, of:  (a) Array Chips which Affymetrix is
     then manufacturing for a third party, which Array Chips are not exclusive
     or proprietary to such third party, or (b) Array Chips which Affymetrix is
     willing to manufacture for BCI.  Such notice shall contain an offer from
     Affymetrix to manufacture and supply such Array Chips to BCI under the
     terms of this Agreement.  Such notice shall also contain the specifications
     of such Array Chip, the transfer price for such Array Chip at an identified
     annual volume of purchases by BCI (the "Target Purchases") and a price
     ladder showing the transfer prices if the BCI purchases in any year are
     above or below the Target Purchases.  The proposed transfer prices in such
     offer shall be fixed for the first year of BCI purchases.
     

     2.1.1     The Affymetrix offer shall remain open for not less than six (6)
               months from the date of receipt by BCI and may be accepted by
               BCI, by written notice to that effect to Affymetrix within such
               period.  If BCI accepts such offer, such Array Chip shall become
               a Product under this Agreement.
          

2.2  IDENTIFICATION OF ARRAY CHIPS BY BCI - BCI may, from time to time, propose
     an Array Chip to be developed by Affymetrix and, when developed,
     manufactured by Affymetrix under this Agreement.  The BCI proposal shall be
     in writing and shall specify the particulars of the Array Chip and contain
     an estimate of BCI's anticipated purchases in each of the next five (5)
     years.
     

     2.2.1     The BCI proposal shall remain in effect for not less than three
               (3) months from the date of receipt by Affymetrix.  Affymetrix
               may, by written notice 

                                      -3-

<PAGE>

               to BCI, at any time within such period offer to develop and 
               manufacture the proposed Array Chip for BCI. The Affymetrix
               offer will include a development schedule, the amount (if 
               any) of Affymetrix development expenses to be reimbursed by
               BCI, the specifications for the Array Chip, a proposed first
               delivery date when commercial scale deliveries will begin, 
               a transfer price for such Array Chip at Target Purchases 
               and a price ladder showing the transfer prices if the
               BCI purchases in any year are above or below the Target
               Purchases.  The proposed transfer prices in such offer shall be
               fixed for the first year of BCI purchases.
          

     2.2.2     The Affymetrix offer shall remain open for not less than three
               (3) months from the date of receipt by BCI and may be accepted by
               BCI by written notice to Affymetrix to that effect within such
               period.  If BCI accepts such offer such Array Chip shall become a
               Product under this Agreement.
          

     2.2.3     Affymetrix and BCI are parties to a research and development
               agreement of even date herewith under which Affymetrix has agreed
               to perform $5,000,000 of contract research and development
               services on Array Chip technology and products of interest to BCI
               (the "R and D Agreement").  To the extent that any part of the
               $5,000,000 under the R and D Agreement is unspent and an
               Affymetrix offer under Paragraph 2.2.1 hereof includes
               development expenses to be reimbursed by BCI then BCI shall
               off-set such development expenses by applying the unspent R and D
               funds up to the full amount of such development expenses.
          
                                          
                        ARTICLE 3.0   MANUFACTURE AND SUPPLY
          

3.1  SUPPLY - PURCHASE COMMITMENT - Affymetrix agrees to and shall manufacture,
     sell and deliver to BCI and BCI shall purchase and take from Affymetrix
     such quantities of the Products as BCI may order in accordance with
     Paragraphs 3.4 and 3.4.1 hereof.

                                      -4-

<PAGE>

3.2  SPECIFICATIONS - Each Product shall conform to its specifications in the
     Affymetrix offer of Article 2.0.  Such specifications shall automatically
     be added to this Agreement, as Exhibit A, concurrently with the BCI
     acceptance of such offer.  Notwithstanding the preceding sentence, BCI may
     at any time request changes, modifications or additions to the
     specifications either prior or subsequent to their addition to Exhibit A. 
     Affymetrix will negotiate in good faith such changes, modifications or
     additions, including any corresponding adjustment to the transfer price or
     other applicable terms and conditions of this Agreement and will use
     reasonable commercial efforts to incorporate such BCI requested changes,
     modifications or additions.  The new specifications will then be added to
     Exhibit A in replacement for the specification in the Affymetrix offer of
     Article 2.0.
     

3.3  CHANGES TO THE PRODUCTS - Affymetrix shall notify BCI of any proposed
     changes to a Product or to the raw materials used therein, or the methods
     for their manufacture, storage or shipment which may alter the Product's
     stability or performance.  Such notice shall include a full description of
     the proposed change and sufficient samples of the proposed new product for
     BCI to determine if the new product meets each and all of the
     specifications for such Product in Exhibit A, correlates in all respects
     with the Product or requires any operating software change for the BCI
     System.  BCI will complete such determination promptly, but in no event
     longer than four (4) months after receipt of such samples.  If BCI
     determines that the proposed new product either does not meet
     specifications or does not correlate with the existing Product, then
     Affymetrix will, at its option, either not make the change or continue to
     sell BCI the existing Product for the remainder of the term of this
     Agreement.  If BCI determines that the proposed new product meets
     specifications and correlates with the existing Product but requires a
     change to the operating software for the BCI System, then Affymetrix agrees
     to and shall:  (a) continue to sell BCI the existing Product until the
     introduction of BCI's next regularly scheduled software modification for
     the effected BCI System and (b) provide sufficient samples of the new
     product at the prices specified in Paragraph 4.3, for BCI to perform system
     validation.  If BCI determines that the proposed new product meets

                                      -5-

<PAGE>

     specifications, correlates with the existing Product and does not require
     any change to the operating software, then Affymetrix may make the desired
     changes and introduce the new product on ninety (90) days prior written
     notice.
     

3.4  FORECASTS AND ORDERING OF PRODUCT - BCI shall, promptly after acceptance of
     an Affymetrix offer under Article 2.0 for a Product provide Affymetrix with
     a written forecast of the quantities of such Product which BCI anticipates
     it will purchase from Affymetrix during each of the next twelve (12)
     months.  A non-cancelable BCI Purchase Order for the total quantity, if
     any, specified during the initial six (6) months of this Agreement, shall
     accompany the forecast.  The remaining six (6) months of the forecast shall
     be BCI's best estimate of its requirements for such Product from Affymetrix
     during such period.  The forecast shall not be binding on either party and
     shall be used for planning purposes only.
     

     3.4.1     BCI shall, within ten (10) days of the end of each three (3)
               month period commencing with the acceptance of the Affymetrix
               offer of Article 2.0 for a Product, send Affymetrix a revised
               twelve (12) month forecast for such Product.  BCI shall include
               with each revised forecast a non-cancelable Purchase Order for
               the quantities, if any, of such Product specified in months four
               (4) through six (6).  The remaining six (6) months of the revised
               forecast shall be BCI's best estimate of its requirements for
               such Product from Affymetrix during such period, shall not be
               binding on either party and shall be used for planning purposes
               only.
          

     3.4.2     Affymetrix shall build Products for BCI only in response to a BCI
               Purchase Order and not to a BCI forecast.
          

     3.4.3     Each BCI Purchase Order shall set forth the quantity to be
               purchased, the delivery date, the form in which the Products are
               to be shipped and shipping instructions.

                                     -6-

<PAGE>

3.5  DELIVERY - Affymetrix shall deliver the Products in the quantities
     specified in the BCI Purchase Orders, FOB Affymetrix loading dock. 
     Affymetrix understands and accepts that BCI operates on a "just-in-time"
     manufacturing system and that the delivery date specified by BCI in the
     non-cancelable Purchase Order is when BCI needs the Products in-house. 
     Accordingly, Affymetrix will plan, manufacture, test and provide adequate
     transportation time to assure that the delivery date is met.  Affymetrix
     will promptly communicate to the BCI Purchasing Agent any anticipated
     delays in delivery so that special shipping or other arrangements can be
     made.  Affymetrix will be responsible for any extra shipping charges
     associated with or resulting from late shipments.  Any disputes arising
     from delivery scheduling shall, to the extent possible, be resolved by the
     BCI Purchasing Agent and the Affymetrix Account Manager.  Any unresolved
     disputes shall be transferred to BCI and Affymetrix Vice-Presidents for
     settlement.  Any disputes which have not been settled by the party's
     Vice-Presidents will be resolved in accordance with Paragraph 14.2.
     

     3.5.1     BCI is not required to accept partial shipments.
          

3.6  RETURN MATERIAL AUTHORIZATION - Affymetrix agrees to promptly respond to
     all requests for return material authorizations and bear all freight and
     insurance costs associated with either Products which do not meet
     specifications or over shipments of Product.
     

3.7  PRODUCT PROBLEM - Each party shall promptly communicate to the other all
     information which comes to its attention pertaining to adverse reactions,
     product anomalies, or stability problems relative to or having a bearing on
     the Products.  Affymetrix shall promptly investigate and regularly report
     back to BCI on its actions contemplated and taken to resolve all such
     problems.

                                      -7-

<PAGE>

3.8    PRODUCT CORRECTIVE ACTION - BCI shall be responsible for, coordinate and
       conduct any corrective action required for Products sold hereunder to
       its customers.  If such corrective action is caused by the failure or
       fault of Affymetrix to comply with Paragraphs 3.2 or 5.1, then
       Affymetrix shall replace, at no cost to BCI, all Products affected
       thereby and shall reimburse BCI for collection of the defective Product
       and shipment of replacement Product.
       

       3.8.1   Each party shall retain samples of each quantity of Products sold
               hereunder.  The number of samples retained shall be specified by
               BCI prior to Affymetrix establishing the Target Price and the
               conditions of storage shall be specified by the current labeling
               of the Products and shall be used to determine if any product
               failures or product corrective actions are the result of a
               failure of Affymetrix to conform with the requirements
               of Paragraphs 3.2 or 5.1 or the result of an Affymetrix design or
               manufacturing defect and thus the responsibility of Affymetrix or
               a storage or handling defect and thus the responsibility of BCI.
          

3.9    PURCHASE AND SALE FORMS - Any terms and conditions on either a BCI
       Purchase Order or an Affymetrix Order Acknowledgment or any other
       document relating to the purchase, sale or transfer of Products between
       the parties which are in conflict with any of the terms of this
       Agreement shall be null and void and without legal effect.
       

3.10   TECHNICAL LITERATURE AND MARKETING ASSISTANCE - Affymetrix shall supply
       BCI with copies of all current and hereafter developed published
       technical literature relative to the Products.  BCI may freely copy such
       literature, in whole or in part, without royalty or payment to
       Affymetrix therefor and may use such copies only in conjunction with its
       sale and customer support of the Products.  BCI shall, prior to using
       such copied literature, obtain Affymetrix approval to the copy,
       graphics and format of such copied literature, which approval shall not
       be unreasonably withheld or delayed.

                                     -8-

<PAGE>

3.11   PROGRAM MANAGER - Each party shall appoint a Program Manager who,
       except for notices under Article 6.0, shall be the source of all
       communications from, and the addressee of all communications to, such
       party relative to the Products.  The Program Managers shall meet from
       time to time, not less than semi-annually, to discuss each party's
       performance and resolve any differences.


                         ARTICLE 4.0    PRICING AND PAYMENT


4.1    PRICING - Subject to Paragraph 4.2, the transfer price from Affymetrix
       to BCI for each Product shall be that specified in the Affymetrix offer
       of Article 2.0.
       
4.2    PRICE CHANGES - Affymetrix may, after the first anniversary of this
       Agreement and subject to the restrictions in the next three (3)
       sentences, adjust the transfer prices for a Product to incorporate
       actual changes in the raw materials and labor costs associated with the
       manufacture of such Product.  There shall be not more than one (1)
       upward adjustment of the price of such Product sold hereunder during any
       continuous twelve (12) month period.  Affymetrix shall provide BCI not
       less than ninety (90) days prior written notice of any proposed increase
       in the purchase price.  Notwithstanding anything in this Paragraph 4.2
       to the contrary, the maximum increase in the transfer price of a Product
       in any twelve (12) month period shall not exceed the increase, if any,
       in the Producer Price Index for Drugs (Code #283) published by the
       Bureau of Labor Statistics of the United States Department of Labor
       using the preceding twelve (12) month period as the base year.  BCI may,
       if it has reduced its average net selling price of a Product to its
       customers as a result of competitive forces in the market place (e.g.,
       lower market prices or the introduction by a competitor of a similar
       product) request a price reduction from Affymetrix.  Such a request
       shall be made in writing and include BCI's reasoning and support
       documentation.  Affymetrix shall, not later than ninety (90) days after
       receipt of such request, confirm, in writing, whether or not it will
       reduce the purchase price for such Product by the same percentage amount
       that BCI has reduced the price of such Product to its customers.  If
       Affymetrix will reduce the purchase price,

                                      -9-

<PAGE>

       such new price shall be effective on the date of such notice.  If 
       Affymetrix will not reduce the purchase price, then BCI may, at any
       time thereafter, on one hundred eighty (180) days prior written 
       notice, terminate this Agreement without any penalty therefor or 
       any right arising in Affymetrix as a result thereof.


4.3    PRICE FOR PRODUCTS USED IN INTERNAL TESTING - Notwithstanding anything
       in this Agreement to the contrary, the prices charged by Affymetrix for
       Products to be used by BCI for application to the BCI System validation,
       systems integration or other internal or quality control testing shall
       be Affymetrix' standard cost plus twenty percent (20%).  BCI shall
       identify on its Purchase Order the quantity of Products required for the
       foregoing purposes and subject to the prices of this Paragraph 4.3 and
       certify that such Products are for internal purposes only.
       

4.4    PAYMENT TERMS - BCI shall pay each Affymetrix invoice for Products
       within thirty (30) days of the latter of receipt of the Products or the
       invoice.
       
4.5    INVOICE INFORMATION - Affymetrix will include the following information
       on all invoices and packing slips:  (i) Purchase Order number including
       the alpha character prefix, (ii) line item number, (iii) release number,
       and, on invoices, the packing slip number.  Affymetrix understands and
       agrees that failure to comply with these requirements may delay payment.
       

                 ARTICLE 5.0   QUALITY ASSURANCE AND COMPLIANCE WITH LAWS
       

5.1    WARRANTY - Subject to the next sentence, Affymetrix warrants that the
       Products are upon receipt by Beckman and shall be for a period of not
       less than six (6) months thereafter free from defects in materials and
       workmanship and shall conform to each and all of the specifications
       therefor in attached Exhibit A.  Affymetrix will use reasonable
       commercial efforts to increase the period of the warranty to twelve (12)
       months.  Affymetrix shall use reasonable commercial efforts to replace
       any Products which fail to comply with the foregoing warranty. 
       Affymetrix' sole obligation 

                                      -10-

<PAGE>

       under this warranty is limited to replacing, as soon as possible, any 
       Products that do not conform with the first sentence of this Paragraph
       5.1.
       

          THE FOREGOING WARRANTY SHALL BE IN LIEU OF ANY OTHER
          WARRANTIES EXPRESS OR IMPLIED, RESPECTING THE PRODUCTS
          SUPPLIED HEREUNDER, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED
          WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
          PURPOSE.  IN NO CASE SHALL AFFYMETRIX BE LIABLE FOR
          CONSEQUENTIAL OR INCIDENTAL DAMAGES ARISING FROM OR IN ANY WAY
          CONNECTED WITH THE WARRANTY OF THIS PARAGRAPH 5.1.
          

          5.1.1     Affymetrix, subject to the next sentence hereof,
          warrants that the Products do not infringe any valid patents
          owned by a third party and not licensed to Affymetrix.  The
          foregoing warranty shall not apply (a) to a Product wherein
          BCI specified the Gene or Genes to be incorporated and it is
          the Gene or Genes which infringe, or (b) to a Product wherein
          BCI specified a change in the design or structure of the
          Product and but for the BCI specified change the Product would
          not infringe, or (c) to a Product which, in and of itself,
          does not infringe but only that Product in combination with
          something not provided by Affymetrix which infringes.
          

5.2    QUALITY TESTING - Affymetrix agrees to and shall, prior to shipment of
       any of the Products sold hereunder, perform each of the quality tests on
       such Products to be hereafter agreed by the parties and attached to this
       Agreement as Exhibit B.  Affymetrix shall provide a Certificate of
       Analysis in a form mutually agreed upon by the parties specifying
       conformance to the preceding sentence and the numerical or other results
       of such testing.

                                     -11-

<PAGE>

5.3    RECEIPT AND ACCEPTANCE - BCI may reject any shipment of Products that
       does not conform to the warranty of Paragraph 5.1
       

5.4    GOOD MANUFACTURING PRACTICES - Affymetrix represents and warrants
       that it will at all times under this Agreement use commercially
       reasonable efforts to comply with U.S. FDA good manufacturing practices
       then in effect and conform to all other applicable statutes and
       regulations.  BCI may, from time to time, upon not less than five (5)
       days prior written notice to Affymetrix inspect the Affymetrix
       facilities where the Products are being manufactured and/or stored.


5.5    QUALITY GOAL - BCI's quality goal is to receive, and Affymetrix' quality
       goal is to supply, defect-free material.  Accordingly, the parties agree
       to a "zero-defect" objective.  Affymetrix understands BCI's supplier
       philosophy and quality supplier principles, and accepts those principles
       as the basis of the relationship between Affymetrix and BCI.  Affymetrix
       and BCI agree to communicate openly and to work together on quality
       programs to achieve long-term success for the businesses involved. 
       Meetings to review progress will be held.  This Paragraph 5.5 is not
       intended to impose on either party any legal obligations additional to
       those imposed by the other sections of this Agreement.  It is intended
       simply to recognize the quality focus on which the parties' business
       relationship is based.
       

5.6    MSDS - Affymetrix shall, if required by law, provide "Material Safety
       Data Sheets" for the Products, as required by 29 CFR 1910.1200.
       

5.7    REGULATORY APPROVAL - Affymetrix shall assist BCI in obtaining any
       regulatory approvals required to make, use and/or sell diagnostic
       products made from or with the Products.  Such assistance shall be at
       BCI's expense and include, but not be limited to, providing such
       information and data relative to the Products as may be requested or
       required by any governmental agency or body.

                                     -12-

<PAGE>

                        ARTICLE 6.0   RIGHTS TO BECKMAN


6.1    EXCLUSIVE SELLER AND DISTRIBUTOR - Affymetrix hereby appoints BCI, and
       BCI accepts appointment, as Affymetrix' sole and exclusive seller and
       distributor throughout the world of the Products for use on BCI Systems. 
       Nothing in the preceding sentence or this Agreement shall prevent
       Affymetrix from selling Array Chips identical to Products for use on
       Affymetrix systems or instruments or the instruments or systems of a
       third party.
       

6.2    RESTRICTIONS ON AFFYMETRIX - Affymetrix will not knowingly, after
       exercising due caution, care and diligence, and undertaking reasonable
       inquiry, sell any Array Chips to an end user who will use such Array
       Chips on a BCI System.  Similarly, Affymetrix will proactively and
       regularly inform each of its dealers and distributors of Affymetrix
       Array Chips that such Array Chips should not be sold to an end user who
       will use such Array Chips on a BCI System.
       
                                          
                           ARTICLE 7.0   CONFIDENTIALITY
       

7.1    CONFIDENTIALITY - Each party shall maintain in confidence (with the same
       level of care as the receiving party uses to safeguard its own highly
       confidential and proprietary information, but no less than a reasonable
       level of care) any information received during the term of this
       Agreement from the other party in written or graphic form or other
       tangible medium of expression that is marked confidential.  Neither
       party shall copy nor publish, disseminate nor disclose such information
       to any third party nor use such information except for the furtherance
       of the specific purposes of this Agreement without the express written
       permission of such other party.  Subject to the next sentence, the
       foregoing obligations of confidentiality and non-use shall continue for
       five (5) years after the expiration of this Agreement.  The obligation
       of the first two sentences shall not apply to any information which is: 
       (a) now or hereafter comes into the public domain, or (b) which is
       already in the possession of the receiving party other 

                                       -13-

<PAGE>

       than as a result of having received it from the disclosing party and as
       shown by written records, or (c) is brought to the receiving party by a
       third party who does not require that it be maintained confidential or 
       (d) is independently developed by the receiving party without use of or
       access to the information of the disclosing party.  Information shall 
       not be deemed to be in the public domain or in the receiving party's 
       possession merely because it is embraced by more general information in
       the public domain or the receiving party's possession or merely because
       individual items of the information are in the public domain or the 
       receiving party's possession.  Upon termination of this Agreement, each
       party shall, at the other party's request, destroy or return to such 
       other party all copies of such information; provided that, counsel for
       each receiving party may retain one (1) copy of such information solely
       for the purpose of monitoring such party's obligation of confidentiality
       under this Agreement.
       

7.2    OBLIGATIONS OF RECEIVING PARTY - Each party agrees that it shall, at its
       sole cost, take all measures (including but not limited to court
       proceedings) to restrain its officers, employees, directors and agents
       from unauthorized use or disclosure of the Information.
       

7.3    INJUNCTION - Each party, acknowledges and agrees that money damages
       would not be a sufficient remedy for its breach of this Article 7.0 and
       that the disclosing party shall be entitled to equitable relief
       including injunction and specific performance as a remedy for any such
       breach.  Such remedies shall not be deemed the exclusive remedy for the
       receiving party's breach but shall be in addition to all other remedies
       available to the disclosing party.  Article 14.0 shall not be a
       limitation on the remedies available to the disclosing party for a
       breach by the receiving party of this Article 7.0.

                                     -14-

<PAGE>

                          ARTICLE 8.0   THIRD PARTY PATENTS


       Subject to the next sentence hereof, Affymetrix agrees to and shall 
defend, indemnify and hold BCI and its customers harmless, including 
attorneys fees necessary to consider, advise and defend, from and against any 
suit, proceeding, claim or loss and any damages or penalties awarded or 
agreed to therein so far as such suit or proceeding is based upon an 
assertion that the use or sale of Products purchased under this Agreement 
constitutes an infringement of any Letters Patent.  The foregoing indemnity 
shall not apply (a) to a Product wherein BCI specified the Gene or Genes to 
be incorporated and it is the Gene or Genes which infringe, or (b) to a 
Product wherein BCI specified a change in the design or structure of the 
Product and but for the BCI specified change the Product would not be alleged 
to infringe, or, (c) to a Product which, in and of itself, is not alleged to 
infringe but only that Product in combination with something not provided by 
Affymetrix is alleged to infringe. If a Product is, in such suit or 
proceeding, held to infringe and its further use or sale is enjoined 
Affymetrix shall, at its sole cost and expense, either: (1) procure for BCI 
and its direct and indirect customers, the right to continue using and 
selling such Product, (2) replace the same with a non-infringing equivalent, 
or (3) modify such Product so that it becomes non-infringing. Affymetrix will 
be responsible for and manage all court proceedings on behalf of BCI for 
claims made under this Paragraph.  BCI shall assist Affymetrix at Affymetrix' 
cost in any reasonable way in handling court proceedings. Affymetrix has the 
right on behalf of BCI to settle claims brought under this Paragraph by third 
parties.

                                          
                          ARTICLE 9.0    HOLD HARMLESS


9.1    HOLD HARMLESS - Affymetrix agrees to and shall defend, indemnify and
       hold BCI, its employees, agents and officers harmless, including
       attorneys fees necessary to consider, advise and defend, from and
       against any suit or proceeding alleging injury to persons, including
       death, or property and any liability, damages or penalties awarded
       therein and resulting from and arising out of Affymetrix' negligence
       in manufacturing, storage, packaging or transport of Products prior to
       receipt thereof by BCI.  BCI agrees to and shall defend, indemnify and
       hold Affymetrix, 

                                     -15-

<PAGE>

       its employees, agents and officers harmless, including attorneys fees
       necessary to consider, advise and defend, from and against any suit 
       or proceeding alleging injury to persons, including death, or property
       and any liability, damages or penalties awarded therein and resulting
       from or arising out of BCI's negligence in handling, storage or 
       transport of Products after receipt thereof from Affymetrix.  Neither
       party will settle a claim from a third party without the prior written
       consent of the other party hereto.  Each indemnifying party will be 
       responsible for and manage court proceedings on behalf of the 
       indemnified party on claims brought by a third party under this 
       Paragraph.  The indemnified party shall assist the indemnifying party
       at the indemnifying party's cost in any reasonable way in handling 
       court proceedings.  The indemnifying party has the right on behalf 
       of the indemnified party to settle claims from third parties brought
       under this Paragraph.
       

9.2    INSURANCE - Each party shall at all times during the term of this
       Agreement self insure for, or purchase and maintain, comprehensive
       general liability insurance including products liability, contractual
       liability and broad form property damage with combined single limits for
       bodily injury and/or death and property damage of $5,000,000 for any one
       occurrence.  Such insurance shall also require thirty (30) days' prior
       written notice of cancellation or material change in coverage.  The
       insurance to apply to any claim will be governed by Paragraph 9.1 and
       with respect to a party's indemnification obligations thereunder,
       provide that such insurance is primary without right of contribution
       from any other insurance which might otherwise be available to the
       insured party and provide that in the event of loss payment under a
       policy the insurer shall waive any rights of subrogation against the
       insured party and shall waive any set-off or counterclaim or any other
       deduction whether by attachment or otherwise as respects the activities
       under this Agreement or any other agreement between the parties.

                                    -16-

<PAGE>

                       ARTICLE 10.0    TERM AND TERMINATION


10.1   TERM - the term of this Agreement shall be ten (10) years from the
       effective date identified on Page 1.
       

10.2   TERMINATION FOR CAUSE - Should either party be in default as to any
       material term of this Agreement and fail to remedy same within forty-five
       (45) days after receipt of written notice of such default by the
       non-defaulting party, then the non-defaulting party shall have, in
       addition to all other remedies available at law or in equity,
       the right to terminate this Agreement upon delivery of written notice of
       termination to the defaulting party, provided that:
       

       (a)     Such notice specifies with particularity the basis for such
               default.
          

       (b)     Such termination shall only relieve the parties of obligations
               which would have arisen under this Agreement after the effective
               date of termination and shall in no way relieve the parties from
               any obligations existing on the date of such termination.
          

       (c)     The failure of the non-defaulting party to terminate this
               Agreement for any cause shall not constitute a waiver of such
               right in the future as to any subsequent default.


                             ARTICLE 11.0    NOTICES


       All notices provided for in this Agreement shall be in writing and shall
be considered delivered when they are personally delivered or are sent by
facsimile, with acknowledgement of receipt in good order requested and received,
or deposited in the mail, registered first class, postage prepaid, or sent by
DHL, Federal Express or similar overnight carrier, addressed to the respective
parties as follows:

                                     -17-

<PAGE>

       If to Beckman:         Beckman Coulter, Inc.
                              4300 North Harbor Boulevard
                              Fullerton, California 92834-3100
                              Attention:   President

       with a copy to:        Beckman Coulter, Inc.
                              4300 North Harbor Boulevard
                              Fullerton, California  92834-3100
                              Attention:   General Counsel

       If to Affymetrix:      Affymetrix, Inc.
                              3380 Central Expressway
                              Santa Clara, California  95051
                              Attention:  President

                              Affymetrix, Inc.
                              3380 Central Expressway
                              Santa Clara, California  95051
                              Attention:   General Counsel


                                          
                            ARTICLE 12.0   SEVERABILITY


12.1   INVALID OR UNENFORCEABLE PROVISIONS - In the event a court of competent
       jurisdiction holds any provision of this Agreement to be invalid or
       unenforceable, such holding shall have no effect on the remaining
       provisions and they shall continue in full force and effect.
       

12.2   CONFLICT WITH APPLICABLE STATUTE - If any of the provisions of this
       Agreement are in conflict with any applicable statute or rule of law,
       then such provisions shall be deemed inoperative to the extent that they
       conflict therewith and shall be deemed to be modified so as to conform
       with such statute or rule of law.
       
12.3   EFFECT AND REMEDIES - In the event that the provisions of this Agreement
       are materially altered as a result of Paragraphs 12.1 and 12.2, the
       parties will renegotiate the affected terms and conditions to resolve
       any inequities.

                                      -18-

<PAGE>

                            ARTICLE 13.0   ASSIGNMENT


       Neither party shall assign this Agreement to another without the prior
written consent of the other party; provided, however, that either party may
assign this Agreement to an Affiliate or a successor in ownership of all or
substantially all of the business assets of the party seeking to assign this
Agreement.  Any other purported assignment shall be void.  This Agreement shall
be a binding obligation of the heirs, successors and permitted assigns of all
the right, title and interest of either party hereto.


                   ARTICLE 14.0    LAW GOVERNING AND CONSTRUCTION


14.1   GOVERNING LAW - This Agreement shall be governed by and construed in
       accordance with the laws of California, without regard to the conflicts
       of laws provisions thereof.  Both parties agree to use their best
       efforts in a good faith attempt to settle as promptly as possible any
       and all disputes arising from transactions pursuant to this Agreement,
       but failing an amicable settlement, such disputes shall be decided in
       accordance with Paragraph 14.2.
       

14.2   MEDIATION AND ARBITRATION - Except for breaches or anticipated breaches
       of Article 7.0, any controversy or conflict involving this Agreement,
       its interpretation or the respective rights or obligations of the
       parties shall first be submitted to their respective Vice-Presidents for
       resolution.  If they cannot agree, the controversy shall be submitted to
       mediation to be held in a mutually agreeable neutral place.  If the
       parties still cannot settle the controversy or reach an accommodation,
       the matter shall be submitted to binding arbitration to be conducted in
       California at a location to be mutually agreed in accordance with the
       following rules:

                                     -19-

<PAGE>

       (a)     there shall be a panel of three (3) arbitrators, all of whom
               shall be lawyers and at least two (2) of which shall be competent
               to fully understand the technology relating to the Products and
               BCI Systems.  If the parties cannot agree on the selection of the
               three (3) then each shall pick one (1) arbitrator and the two (2)
               so chosen shall select the third.
          

       (b)     All disputes which are not specifically raised by the parties in
               the arbitration process shall be forever waived.
          

       (c)     The arbitration proceeding shall be governed by (i) the rules and
               understandings set forth in this Paragraph 14.2 or as hereafter
               agreed upon in writing by the parties, and (ii) to the extent not
               inconsistent with such rules and understandings, by the
               Commercial Arbitration Rules of the American Arbitration
               Association.
          

       (d)     The parties agree to refrain from filing a lawsuit with regard to
               any aspect of their controversy and to abide by and perform any
               award rendered by the arbitrators.  The parties further agree
               that a judgment of a Court having jurisdiction may be entered
               upon the award and an execution may be issued for its collection.
          

       (e)     At least two (2) of the panel of arbitrators must agree on each
               point in controversy for an award to be rendered.
          

       (f)     The arbitration hearing shall be convened within forty-five (45)
               days of request therefor by either party.  The request shall be
               in writing and sent in accordance with Article 11.0.  The hearing
               shall be limited to three days:  Each party shall have a maximum
               of eight (8) hours to put on its main case and four (4) hours for
               rebuttal.  Neither party shall engage in extended
               cross-examination or other tactics which have the effect of
               substantially altering this allocation.

                                     -20-

<PAGE>

       (g)     The parties agree to exchange all documents they intend to
               produce at the hearing at least thirty (30) days in advance of
               taking of depositions, serving of interrogatories or any other
               form of discovery and neither party may compel the appearance of
               the other party's employees, officers, directors or consultants.
          

       (h)     The arbitrator's decision must be rendered within thirty (30)
               days after completion of the arbitration hearing.
          

       (i)     A transcript may, at the option of the parties, be made.  Either
               party may, at its expense, tape record or video tape the
               proceedings.
          

       (j)     All applicable common law or statutory privileges such as
               attorney-client or attorney work product shall be applicable to
               the arbitration proceedings.
          

       (k)     Either party may, at its option, use prepared testimony as long
               as the witness whose testimony is so presented is available to
               the other party for cross-examination.
          

       (l)     Each party shall bear its own expenses for the arbitration and
               they shall each share equally in the expenses and fees of the
               arbitration panel.
          

14.3   MUTUALITY - This Agreement has been drafted after considerable
       negotiation by the parties and on the basis of mutual understanding;
       neither party shall be prejudiced as being the drafter thereof.

                                      -21-

<PAGE>

                           ARTICLE 15.0   PUBLIC STATEMENTS


       Neither party shall make any public announcement or authorize or author
any statement to the press regarding this Agreement or any of its terms or
conditions of the relationships between the parties created by this Agreement
without the prior written permission of the other party.  The terms and
conditions of this Agreement shall be maintained as confidential in accordance
with Article 7.0 hereof.

                                          
                            ARTICLE 16.0    FORCE MAJEURE


       Each of the parties hereto shall be excused from the performance of its
obligations under this Agreement in the event performance is prevented by Force
Majeure.  For purposes of this Agreement, Force Majeure is defined as a cause
beyond the control of the effected party, including but not limited to acts of
God, acts, laws or regulations of any government, civil disorder, strikes,
destruction of production facilities or material by fire, water, earthquake or
storm, epidemics and failures of public utilities or common carriers.  The party
incurring a Force Majeure condition shall notify the other party that such
condition exists within five (5) days of the time such party learns of such
condition.  Should such Force Majeure condition continue for forty-five (45)
days after such notice, the non-affected party may, at its option, terminate
this Agreement.
                                          
                                          
                        ARTICLE 17.0   RELATIONSHIP CREATED


       The relationship created by this Agreement shall be strictly that of a
supplier and purchaser.  Neither party is hereby constituted an agent or legal
representative of the other party for any purpose whatsoever.  Neither party is
granted any right or authority hereunder to assume or create any obligation,
express or implied, or to make any representations, warranties or guarantees on
behalf or in the name of the other party, except to the extent that such right
or authority, or such representations, warranties or guarantees are expressly
provided for in this Agreement.

                                     -22-

<PAGE>

                 ARTICLE 18.0  ENTIRE AGREEMENT, MODIFICATION


18.1   ENTIRE AGREEMENT - This instrument contains the entire and only
       agreement between the parties respecting the subject matter hereof and
       supersedes all previous negotiations, representations, understandings,
       promises or conditions, both written and oral, heretofore made between
       the parties with respect to the subject matter hereof.
       

18.2   MODIFICATION - No waiver, alteration or modification of this Agreement
       shall be valid unless made in writing and signed by a duly authorized
       representative of BCI and Affymetrix.



       IN WITNESS WHEREOF, the parties hereto have signed this Agreement by
their duly authorized representatives as of the day and year first written
above.




Beckman Coulter, Inc.                        Affymetrix, Inc.


By:                                     By:                      
  ----------------------------             -----------------------------
Date:                                   Date:                         
     -------------------------               ---------------------------


                                      -23-
<PAGE>
                                           EXHIBIT C TO THE CONSORTIUM AGREEMENT
                                                       DATED AS OF JULY 31, 1998
 
                               LICENSE AGREEMENT
 
    License Agreement effective this   day of            1998 ("Effective Date")
by and between AFFYMETRIX, INC. a             corporation, having a place of
business at 3380 Central Expressway, Santa Clara, California 95051
("Affymetrix", as that term is more fully defined in Paragraph 1.2 hereof) and
BECKMAN COULTER, INC., a Delaware corporation, having a place of business at
4300 North Harbor Boulevard, Fullerton, California 92834-3100 ("BCI", as that
term is more fully defined in Paragraph 1.4 hereof).
 
                                R E C I T A L S
 
  I. BCI and Affymetrix are members of a consortium that has as one of its
     principal objectives the development and commercialization of Array Chips
     (as that term is hereafter defined) and analytical processes which use such
     Array Chips.
 
 II. BCI has patents and pending patent applications covering the making of
     Array Chips.
 
 III. Affymetrix desires to acquire a license under the BCI patents related to
      the making of Array Chips.
 
    NOW THEREFORE in consideration of the mutual understandings contained herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the parties intending to be legally bound, agree as
follows:
 
                            ARTICLE 1.0  DEFINITIONS
 
    The following terms, when used herein with an initial capital letter and
without regard to whether they appear in the singular, plural or possessive
form, shall have the following defined meanings:
 
 1.1 "AFFILIATE" shall mean any corporation or other form of limited liability
     legal person, partnership, association, joint venture or other form of
     business entity controlled by, controlling or under common control with a
     party hereto. As used herein, the word and root "control" in the context of
     a corporation shall mean the ownership, directly or indirectly, of more
     than fifty percent (50%) of the voting shares or other equity interests
     entitled to vote in the election of directors of the corporation; and, in
     the context of any other form of business entity the right to receive at
     least fifty percent (50%) of the net proceeds of such entity.
 
 1.2 "AFFYMETRIX" shall mean Affymetrix, Inc., its divisions and Affiliates and
     its and their permitted successors and assigns.
 
 1.3 "ARRAY CHIPS" shall mean a series of polynucleotides arranged on a
     substrate to perform quantitative or qualitative analyses.
 
 1.4 "BCI" shall mean Beckman Coulter, Inc., its divisions and Affiliates and
     its and their permitted successors and assigns.
 
 1.5 "BACTERIOLOGY FIELD" shall mean and be limited to: (i) detection and or
     identification of bacterial and fungal microorganisms, and/or (ii) the
     determination of antibiotic resistance of such bacterial and fungal
     microorganisms, in each case limited to use in the Clinical Diagnosis (as
     that term is hereafter defined) of human disease.
 
 1.6 "CLINICAL DIAGNOSIS" shall mean a process in which a sample of fluid or
     other material collected from individual humans that is used to aid in
     diagnosis of one or more human diseases, the results of such
 
                                       1
<PAGE>
     process used for communication to such persons or their physicians or other
     caregivers for clinical decisions in connection with such individual
     humans.
 
 1.7 "LICENSED PRODUCT" shall mean any Array Chip, component, product, kit,
     instrument or system which, but for the licenses and rights granted herein,
     would infringe any valid claim in an unexpired and non-lapsed patent in the
     Patent Rights.
 
 1.8 "LICENSED PROCESS" shall mean any process, method or procedure the practice
     or use of which, but for the licenses and rights granted herein, would
     infringe any valid claim in an unexpired and non-lapsed patent in the
     Patent Rights.
 
 1.9 "NET SALES" shall mean the gross receipts of Affymetrix from the sale of
     Royalty-Bearing Products to an unaffiliated third party, less those of the
     following actually incurred by Affymetrix as an element of such sales:
     transportation, special packing and crating charges, insurance, custom
     duties, commissions, returns, allowances in lieu of actual returned or
     rejected Royalty-Bearing Products, sales, use and turnover taxes, and
     trade, quantity, contract and cash discounts. The value of Royalty-Bearing
     Products transferred by Affymetrix to unaffiliated third parties as free
     samples or the use of Royalty-Bearing Products by Affymetrix for sales
     demonstration purposes or for quality control or other internal,
     non-revenue generating purposes shall not be included in the calculation of
     Net Sales.
 
     In the event a Royalty-Bearing Product is sold in combination with other
     apparatus or products, as part of a kit, or in any other combination, and
     the Royalty-Bearing Product is not separately valued on the invoice or
     other document evidencing such sale, the Net Sales of the Royalty-Bearing
     Product shall be the then current list price for the Royalty-Bearing
     Product when sold separately or, in the absence of such list price, shall
     be determined by multiplying the aggregate selling price of the combination
     by a fraction the numerator of which shall be Affymetrix' standard costs
     for the Royalty-Bearing Product and the denominator of which shall be
     Affymetrix' standard cost for the total combination at the time of the
     sale. In the event that both the Royalty-Bearing Product and other product
     have separate list prices but are being sold at a combination price which
     is less than the total of the separate list prices, then the Net Sales of
     the Royalty-Bearing Product shall be determined by multiplying the invoice
     price charged for the combination by a fraction, the numerator of which is
     the list price of the Royalty-Bearing Product and the denominator of which
     is the sum of the list prices of the Royalty-Bearing Product and such other
     products.
 
 1.10 "PATENT RIGHTS" shall mean all applications for patent and patents, filed
      or issued in any country of the world, (a) now owned or controlled by BCI
      or at any time during the twenty (20) years commencing with the Effective
      Date owned or controlled by BCI and (b) relating to or useful in the
      manufacture or use or processing of Array Chips; provided that Patent
      Rights shall not include the specific claims of any such applications or
      patents related to: (i) specific genes, or (ii) computer software for
      using the data generated from the use of Array Chips, or (iii) readers or
      instruments or systems for using Array Chips to perform analyses or for
      automating such analyses, or (iv) pre-treatment of samples prior to their
      interaction with an Array Chip. For purposes of this definition, a patent
      or application for patent is controlled by BCI if BCI is a licensee under
      such patent or application and BCI has the right to grant sublicenses to
      third parties, in each case without regard to whether BCI would thereby be
      responsible for reporting to and/or paying royalties to such third party
      as a result or as a consequence thereof or as a result or consequence of
      Affymetrix' use of such patent or application. If a patent or application
      for patent is controlled by BCI it shall be sublicensed to Affymetrix at
      the same royalty rate as BCI pays to its licensor promptly after BCI's
      acquisition of such control.
 
 1.11 "ROYALTY-BEARING PRODUCT" shall mean the Affymetrix Licensed Product with
      the lowest selling price which is separately priced for sale as an
      individual unit by Affymetrix in the ordinary course of business, even if
      the Patent Rights include one or more claims to a larger unit of the
      product, component, kit, instrument or system or to the overall product
      and Affymetrix sells such larger unit and/or overall product or the Patent
      Rights include one or more claims to the use of such product,
 
                                       2
<PAGE>
      component, kit, instrument or system or a method which utilizes such
      product, component, kit, instrument or system whether such method is
      practiced by Affymetrix or the direct or indirect customers of Licensed
      Products purchased from Affymetrix.
 
                  ARTICLE 2.0  REPRESENTATIONS AND WARRANTIES
 
 2.1 BCI REPRESENTATIONS AND WARRANTIES--BCI represents and warrants that (a) it
     owns or otherwise has the right to grant the licenses and rights provided
     for herein under all of the applications or patents presently in the Patent
     Rights, and (b) it will use commercially reasonable efforts to obtain the
     right in any license agreement it hereafter enters with third parties to
     obtain rights to applications for patent or patents of such third parties
     wherein the applications for patent or patent are useful or necessary for
     making or using Array Chips and not subject to exclusions (i)-(iv) of the
     definition of Patent Rights, to pass such license on to Affymetrix under
     the same terms and conditions as those granted to Affymetrix by such third
     parties.
 
 2.2 AFFYMETRIX REPRESENTATIONS AND WARRANTIES--Affymetrix represents and
     warrants that they will not knowingly, after exercising due caution, care
     and diligence, and undertaking reasonable inquiry sell any of its Array
     Chips (whether or not made under the license of Paragraph 3.1) to an end
     user who will use such Array Chips on an instrument, system or device
     manufactured or distributed by BCI. Affymetrix further represents and
     warrants that they will proactively and regularly inform each of their
     dealers and distributors of Array Chips (whether or not made under the
     license of Paragraph 3.1 that such Array Chips should not be sold to end
     users who will use such Array Chips on an instrument, system or device
     manufactured or distributed by BCI.
 
                           ARTICLE 3.0  LICENSE GRANT
 
 3.1 LICENSE GRANT--Subject to the proviso hereafter, BCI hereby grants to
     Affymetrix and Affymetrix accepts a royalty bearing, non-exclusive,
     world-wide right and license under the Patent Rights to (a) make, have
     made, import, use, sell, lease and otherwise dispose of Licensed Products
     in all fields, uses and applications except for the Bacteriology Field and
     except for use on any instrument, system or device manufactured or
     distributed by BCI, (b) to practice Licensed Processes, and (c) to pass on
     to its direct and indirect customers of Licensed Products the right to
     practice Licensed Processes; provided that, the exception as to the
     Bacteriology Field shall be only for so long in time and only to the extent
     that Affymetrix is excluded from such Field by the executory license
     agreement with BioMerieux in effect as of the Effective Date.
 
 3.2 PATENT MARKING--Affymetrix shall attach a label or product insert on each
     Licensed Product reasonably reflecting patent numbers of issued U.S.
     patents covering such Licensed Product and owned by BCI and will reasonably
     modify such labels or inserts periodically at the direction of BCI to add
     or delete patent numbers.
 
 3.3 NOTIFICATIONS OF NEW PATENT RIGHTS--BCI shall, promptly after (a) the
     filing of a patent application in the United States which is within the
     definition of Patent Rights, and (b) the signing of a license agreement
     with a third party granting BCI a license under an application for patent
     or patent, anywhere in the world, which would be "controlled by" BCI, as
     that term is defined in Paragraph 1.10, provide Affymetrix with a copy of
     such application or patent and a written notice that such patent or
     application (and any patent issuing from such application or any
     continuation, division, continuation-in-part or substitute of such
     application) or any reissues or reexaminations of such patents anywhere in
     the world are included within the Patent Rights and the rights and licenses
     granted to Affymetrix under Paragraph 3.1. Notwithstanding the foregoing or
     anything in this Agreement to the contrary, the failure of BCI to notify
     Affymetrix of an addition to the Patent Rights in accordance with this
     Paragraph 3.3 shall have no effect on the rights granted to Affymetrix
 
                                       3
<PAGE>
     under Paragraph 3.1 and such applications and patents shall be included in
     the Patent Rights without regard to whether Affymetrix does or does not
     receive such notice.
 
                   ARTICLE 4.0  ROYALTIES AND ROYALTY REPORTS
 
 4.1 ROYALTIES--Subject to Paragraph 4.2, Affymetrix shall pay BCI for all of
     the licenses and rights granted under Paragraph 3.1 a running royalty of
     [            ](1) of Net Sales of Royalty-Bearing Products.
 
 4.2 ROYALTY STACKING--If, at any time during the life of this Agreement,
     Affymetrix discovers that any Royalty-Bearing Product or the use thereof
     infringes claims of an unexpired patent or patents other than those in the
     Patent Rights Affymetrix may, if it has not already done so, negotiate with
     the owner of such patents for a license on such terms as Affymetrix deems
     appropriate. Should the license with the owner of such patents require the
     payment of royalties or other consideration to such owner then the
     royalties otherwise payable under this Agreement shall be reduced by the
     same amount as the royalties paid or payable to such owner, but such
     reduction shall not exceed one-half (1/2) of the royalties payable
     hereunder.
 
 4.3 ROYALTY REPORTS--Affymetrix shall, commencing with the calendar quarter
     which includes its first sale of a Royalty-Bearing Product and each
     calendar quarter thereafter, not later than forty-five (45) days after the
     close of its accounting books and records for such quarter, provide to BCI
     an accounting report of the type and quantity of each Royalty-Bearing
     Product sold by Affymetrix during such calendar quarter and the Net Sales
     received therefrom. The royalty due and payable to BCI shall accompany such
     report.
 
 4.4 Books and Records--Affymetrix shall keep or cause to be kept books, records
     and accounts in accordance with generally accepted accounting principles
     consistently applied covering Affymetrix' activities hereunder and
     containing all information necessary for the true and accurate
     determination of the amounts earned and paid hereunder. Affymetrix shall,
     not more than once per year and upon prior reasonable written notice from
     BCI, permit a certified public accountant appointed and paid for by BCI
     (the "Auditor") and reasonably acceptable to Affymetrix to inspect each
     Affymetrix facility manufacturing Royalty-Bearing Products and to review
     the previous two (2) years books, records and accounts to verify the
     amounts earned by BCI and paid by Affymetrix hereunder. The Auditors shall
     furnish to both parties reports stating only its findings during such
     inspection as to the accuracy, or the nature and extent of any inaccuracy
     of such books, records, accounts and payments.
 
    4.4.1 Any deficiency identified by the Auditor between the amounts actually
          earned by BCI under this Article 4.0 and the amounts reported to be
          earned and paid on by Affymetrix in accordance with Paragraph 4.3
          hereof shall, unless disputed by Affymetrix, be paid to BCI within
          thirty (30) days of receipt by Affymetrix of the Auditor's report. The
          parties agree to diligently negotiate and promptly settle any disputes
          as to the amount of royalties earned by BCI and payable by Affymetrix
          hereunder.
 
 4.5 TAXES ON ROYALTIES--All payments provided for in this Agreement refer to
     lawful money of the United States of America. All payments shall be made by
     Affymetrix to BCI at the office of BCI designated above and shall be made
     in the full amounts as herein specified; provided, however, that deduction
     may be made from such payments by Affymetrix for amounts required to be
     withheld and paid by Affymetrix in respect of any income tax levied or
     assessed upon such payments by, and in accordance with the laws of, any
     foreign government or taxing authority. BCI shall have the right at any
     time or from time-to-time to contest by appropriate proceedings the
     validity or amount of any such income tax withheld. If so requested by BCI,
     Affymetrix will make such payments under protest, and, on
 
- - ------------------------
 
 (1) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
     SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
 
                                       4
<PAGE>
     behalf and at the expense of BCI, take such other action and render all
     reasonable assistance that may be required by BCI in the prosecution of any
     such proceedings. Affymetrix will obtain and forward to BCI tax credit
     receipts or vouchers for all income taxes thus withheld and paid by
     Affymetrix.
 
 4.6 ROYALTIES EARNED IN FOREIGN CURRENCY--In the event that either Net Sales or
     the royalties set forth above are initially calculated in a foreign
     currency, conversion shall be made in each instance by employing the
     closing transfer buying rate for United States dollars quoted by the Wall
     Street Journal, for the last business day of the calendar quarter which the
     payment covers; provided, however, that if a foreign currency not listed in
     the Wall Street Journal is involved, then the closing transfer buying rate
     quoted by Citibank (New York) shall be employed in effecting such
     conversion thereof.
 
                      ARTICLE 5.0  CONSTRUCTION OF PATENTS
 
    If a judgment or decree is entered, which becomes final through the
exhaustion of all permissible applications for rehearing or review by a superior
tribunal, or through the expiration of the time permitted for such applications
(hereinafter referred to as an "irrevocable judgment"), on the validity, scope,
enforceability or priority of any claim or claims of any patent or patent
application included in the Patent Rights the construction placed upon any such
claim or claims by such irrevocable judgment shall be thereafter followed with
respect to acts occurring thereafter.
 
    If such irrevocable judgment holds any claim invalid or unenforceable or is
adverse to the patent containing such claim as to inventorship, or construes all
applicable claims in a patent so as not to cover Royalty-Bearing Product,
Affymetrix shall be relieved thereafter from payment of royalties under Article
4.0 hereof, as to Royalty-Bearing Products sold after the date of such
irrevocable judgment covered only by such claim or claims to which such
irrevocable judgment is applicable, and from the performance of those other acts
which may be required by this Agreement only as to such claim or claims.
 
                     ARTICLE 6.0  PROSECUTION OF INFRINGERS
 
    If Affymetrix determines that a third party is infringing a claim of a
patent in the Patent Rights by making, using or selling a product which competes
with a Licensed Product then being sold by Affymetrix, it shall notify BCI
thereof in writing. Such notice shall include information in Affymetrix'
possession relevant to such third party and the competing product. BCI shall
have ninety (90) days in which to either obtain the consent of such third party
to discontinue such infringement or to exercise its right to bring an action to
cause such infringement to cease. BCI shall have no obligation to bring an
action for infringement; provided however, if BCI does not obtain the consent of
such third party to cease infringement or does not bring suit against the third
party under the patent, then Affymetrix shall have the right to discontinue
paying royalties under the effected patent for such product until either the
third party discontinues its infringing activity or BCI brings a lawsuit against
the third party for such infringement.
 
                       ARTICLE 7.0  TERM AND TERMINATION
 
 7.1 TERMINATION BY BCI--If Affymetrix shall at any time be in material breach
     of this License Agreement, including but not limited to, default on any
     payment hereunder, or of the making of any report hereunder, or shall make
     any materially false report and should fail to remedy such material breach
     within sixty (60) days after written notice thereof by BCI, the latter may,
     at its option, terminate this License Agreement by notice to such effect,
     provided that such termination shall not release Affymetrix from its
     obligation to pay BCI royalties or other sums due and accrued prior to the
     date of such termination.
 
 7.2 TERMINATION BY AFFYMETRIX--Affymetrix shall have the right upon three (3)
     months prior written notice to BCI to terminate this Agreement in its
     entirety or to surrender all right and license under any one
 
                                       5
<PAGE>
     or more of the patents included in the Patent Rights, such surrender being
     operative to relieve Affymetrix, as of the effective date of said notice,
     of all obligation to pay royalties which would otherwise have accrued
     thereafter solely because of such patents. Such termination or surrender
     shall not relieve Affymetrix of its obligation to pay royalties or other
     sums due and accrued prior to the effective date of such notice or of its
     continuing obligation to pay royalties on other than the surrendered
     patents included in the Patent Rights.
 
 7.3 TERM--Unless previously terminated as provided herein, the life of this
     License Agreement and the license granted herein shall run from the
     Effective Date to the end of the term of the last expiring patent now or
     hereafter included in the Patent Rights.
 
                        ARTICLE 8.0  EXERCISE OF RIGHTS
 
    The failure by one of the parties under this License Agreement to assert its
rights for any breach of this License Agreement shall not be deemed a waiver of
such rights. The rights and remedies specified herein, except those specified as
exclusive, are in addition to and shall not restrict any right or remedy either
party may have at law or in equity for any breach of this License Agreement.
 
                            ARTICLE 9.0  ASSIGNMENT
 
    Affymetrix may not assign this License Agreement in whole or in part without
obtaining the prior written approval of BCI, except that Affymetrix shall have
the right to assign this License Agreement without the consent of BCI to any
Affiliate and to any successor of its business to which the subject matter of
this License Agreement relates.
 
                         ARTICLE 10.0  FAVORED LICENSEE
 
    In the event that after the Effective Date BCI enters into a license
agreement with a third party in which agreement such third party is licensed to
make, use or sell one or more products under the Patent Rights (or any part
thereof) which Affymetrix is entitled to make, use and sell under this
Agreement, then BCI will notify Affymetrix in writing within thirty (30) days of
entering such an agreement and describe the following terms of any such
agreement:
 
    (i) the scope of the license
 
    (ii) the royalty rate
 
   (iii) any cross license consideration or other consideration; and, if
         applicable
 
    (iv) the basis of BCI's belief that the terms of such agreement are not more
         favorable than those given to Affymetrix under this Agreement.
 
    If BCI determines in good faith in the exercise of reasonable business
judgment (and not for the purpose of depriving Affymetrix of its rights under
this Article 10.0) that the financial terms of the third party license are less
favorable than this Agreement, then no terms of this Agreement shall be changed.
If BCI determines that the financial terms of the third party license are more
favorable than this Agreement, then BCI shall give Affymetrix the benefit of the
more favorable financial terms for the products licensed to such third party.
For the avoidance of doubt, any Licensed Products which are covered by the grant
of license under this Agreement but are not included in the license granted to
the third party, shall remain at the royalty rate of this Agreement and only the
Licensed Products which are covered by the grant of the license under this
Agreement and are included in the license granted to the third party shall have
the benefit of the more favorable financial terms.
 
                                       6
<PAGE>
                             ARTICLE 11.0  NOTICES
 
    All notice and payments required or permitted to be given hereunder shall be
in writing and addressed to the respective parties as follows:
 
If to Affymetrix:    Affymetrix, Inc.
                     3380 Central Expressway
                     Santa Clara, California 95051
                     Attention:
 
If to BCI:           Beckman Coulter, Inc.
                     4300 North Harbor Boulevard
                     Fullerton, California 92834-3100
                     Attention:  President
 
With a copy to:      Beckman Coulter, Inc.
                     4300 North Harbor Boulevard
                     Fullerton, California 92834-3100
                     Attention:  General Counsel
 
or such other addresses as may be designated by the respective parties in
writing. A notice shall be deemed given the earlier of the date when actually
received if sent by messenger or facsimile (with notice of receipt in good order
requested and received) or three (3) days after deposit in the United States
registered or certified mail, postage prepaid, and properly addressed.
 
                         ARTICLE 12.0  SECTION HEADINGS
 
    Section headings are for convenience only and shall not be construed to
limit or extend the meaning of any portion of this License Agreement.
 
                  ARTICLE 13.0  LAW GOVERNING AND CONSTRUCTION
 
    This License Agreement shall be governed by and construed in accordance with
the laws of the State of California as if the Agreement had been delivered in
California and all acts which are done or are required to be done hereunder were
all performed within such State.
 
                          ARTICLE 14.0  MISCELLANEOUS
 
 14.1 Nothing in this Agreement shall be construed as conferring any right to
      use in advertising, publicity, or other promotional activities any name,
      trade name, trademark, or other designation of either party hereto without
      the express written approval of the other party.
 
 14.2 BCI makes no warranties as to the validity or scope of any of the Patent
      Rights, or that any manufacture, sale, use, or other disposition of the
      products licensed hereunder will be free from infringement of patents,
      utility models, and/or design patents of third parties. Nothing in this
      Agreement shall be considered as conferring any warranty or representation
      as to the usefulness, marketability, or merchantability of any products
      sold within the scope of the licenses hereunder. Affymetrix and BCI agree
      to hold the other harmless from any personal injury or products liability
      claims made as a result of the sale of products licensed hereunder.
 
 14.3 The Parties will retain the terms of this Agreement in strict confidence,
      except as may be required by regulatory agencies or courts, and will then
      use all reasonable precautions to maintain the terms of this Agreement
      confidential.
 
 14.4 BCI and Affymetrix represents that they are familiar with the Export
      Administration Regulations comprising the compilation of official
      regulations and policies governing the export licensing of
 
                                       7
<PAGE>
      commodities and technical data promulgated by the United States Department
      of Commerce, Bureau of International Commerce, Office of Export
      Administration. Notwithstanding any other provisions of this Agreement,
      and each assures the other that with respect to all information and
      licenses furnished by or under this Agreement, that it will comply with
      such official regulations.
 
 14.5 In the event that any provision of this Agreement is held invalid or
      unenforceable for any reason, such unenforceability shall not affect the
      enforceability of the remaining provisions of this Agreement, and all
      provisions of this Agreement shall be construed so as to preserve the
      enforceability hereof.
 
 14.6 This Agreement may be executed in any number of counterparts, each of
      which shall be deemed an original but all of which together shall
      constitute one and the same instrument.
 
 14.7 This License Agreement has been drafted on the basis of mutual
      understanding after considerable negotiation and neither party shall be
      prejudiced as being the drafter thereof.
 
              ARTICLE 15.0  ENTIRE AGREEMENT, MODIFICATIONS, ETC.
 
    This instrument contains the entire and only agreement between the parties
relative to the subject matter hereof and supersedes all previous negotiations,
representations, undertakings and agreements both written and oral heretofore
made between the parties as to the subject matter. Any representation, promise
or condition in connection herewith not specifically incorporated herein shall
not be binding upon either party.
 
    No modification, renewal, extension, waiver, cancellation or termination of
this Agreement or of any of the provisions herein contained shall be valid until
and unless made in writing and signed on behalf of the respective parties by
duly authorized officers thereof.
 
    IN WITNESS WHEREOF, the parties have respectively caused this Agreement to
be executed on the dates hereinafter indicated.
 
<TABLE>
<S>    <C>                                 <C>    <C>
By:    ------------------------------      By:    ------------------------------
Title:                                     Title:
       ------------------------------             ------------------------------
Date:                                      Date:
       ------------------------------             ------------------------------
</TABLE>
 
                                       8
<PAGE>

                                          Exhibit D to the Consortium Agreement
                                                      dated as of July 31, 1998

                                  LICENSE AGREEMENT


     License Agreement effective this _____ day of _____ 1998 ("Effective Date")
by and between AFFYMETRIX, INC. a California corporation, having a place of
business at 3380 Central Expressway, Santa Clara, California 95051
("Affymetrix", as that term is more fully defined in Paragraph 1.2 hereof) and
BECKMAN COULTER, INC., a Delaware corporation, having a place of business at
4300 North Harbor Boulevard, Fullerton, California 92834-3100 ("BCI", as that
term is more fully defined in Paragraph 1.4 hereof).

                                          
                                  R E C I T A L S 


I.     BCI and Affymetrix are members of a consortium that has as one of its
       principal objectives the development and commercialization of Array
       Chips (as that term is hereafter defined) and analytical processes which
       use such Array Chips.
       

II.    Affymetrix has patents and pending patent applications covering the
       making and using of Array Chips.  Affymetrix has a development program
       which has as its objective the development of technology relating to the
       making and using of Array Chips and the acquisition of patents related
       to such technology.
       

III.   BCI desires to acquire a license under certain present and hereafter
       acquired Affymetrix patents related to the making and using of Array
       Chips.

                                     -1-

<PAGE>

       NOW THEREFORE in consideration of the mutual understandings contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties intending to be legally bound, agree
as follows:

                                          
                           ARTICLE 1.0    DEFINITIONS


       The following terms, when used herein with an initial capital letter and
without regard to whether they appear in the singular, plural or possessive
form, shall have the following defined meanings:


1.1    "AFFILIATE" shall mean any corporation or other form of limited
       liability legal person, partnership, association, joint venture or other
       form of business entity controlled by, controlling or under common
       control with a party hereto.  As used herein, the word and root
       "control" in the context of a corporation shall mean the ownership,
       directly or indirectly, of more than fifty percent (50%) of the voting
       shares or other equity interests entitled to vote in the election of
       directors of the corporation; and, in the context of any other form of
       business entity, the right to receive more than fifty percent (50%) of
       the net profits of such entity and the right to a majority interest in
       the management and control of such entity; provided that,
       notwithstanding the foregoing definition, BCI may not have as an
       Affiliate entitled to receive the benefits of the licenses granted under
       Section 3.1 hereof (a) a corporation wherein any of the companies listed
       in Exhibit A is more than a passive investor in such Affiliate and such
       passive investor does not have the right to manage or control

                                     -2-

<PAGE>

       such Affiliate or (b) a partnership wherein any of the companies listed
       in Exhibit A is a partner.
       

1.2    "AFFYMETRIX" shall mean Affymetrix, Inc., its divisions and Affiliates
       and its and their permitted successors and assigns.

1.3    "ARRAY CHIPS" shall mean a series of polynucleotides arranged
       on a substrate to perform quantitative or qualitative analyses.

1.4    "BCI" shall mean Beckman Coulter, Inc., its divisions and Affiliates and
       its and their permitted successors and assigns.

1.5    "BCI ARRAY CHIP" shall mean an Array Chip which is sold or used by BCI
       and, but for the licenses and rights granted herein, would infringe any
       valid claim in an unexpired and non-lapsed patent in the Patent Rights.

1.6    "BACTERIOLOGY FIELD" shall mean and be limited to:  (i) detection and
       or identification of bacterial and fungal microorganisms, and/or (ii)
       the determination of antibiotic resistance of such bacterial and fungal
       microorganisms, in each case limited to use in the Clinical Diagnosis
       (as that term is hereafter defined) of human disease.

                                    -3-

<PAGE>

1.7    "CLINICAL DIAGNOSIS" shall mean a process in which a sample of fluid or
       other material collected from individual humans that is used to aid in
       diagnosis of one or more human diseases, the results of such process
       used for communication to such persons or their physicians or other
       caregivers for clinical decisions in connection with such individual
       humans.

1.8    "EXPRESSION ANALYSES" shall mean an Array Chip used for determination of
       the amount of one or more expressed messenger RNA in a sample.

1.9    "GENE" shall mean a nucleic acid sequence or set of sequences encoding a
       distinct messenger nucleic acid and protein as well as polymorphic
       variants of such sequence; provided that, such polymorphic variants must
       have at least 99.9% homology with the underlying gene.

1.10   "LICENSED PRODUCT" shall mean any BCI Array Chip or component thereof or
       any  product, kit, instrument or system which, but for the licenses and
       rights granted herein, would infringe any valid claim in an unexpired
       and non-lapsed patent in the Patent Rights.

1.11   "LICENSED PROCESS" shall mean any process, method or procedure the
       practice or use of which, but for the licenses and rights granted
       herein, would infringe any valid claim in an unexpired and non-lapsed
       patent in the Patent Rights.

                                     -4-

<PAGE>

1.12   "NET SALES" shall mean the gross receipts of BCI from the sale of BCI
       Array Chips to an unaffiliated third party, less those of the following
       actually incurred by BCI as an element of such sales:  transportation,
       special packing and crating charges, insurance, custom duties,
       commissions, returns, allowances in lieu of actual returned or rejected
       BCI Array Chips, sales, use and turnover taxes, and trade, quantity,
       contract and cash discounts.  The value of BCI Array Chips transferred
       by BCI to unaffiliated third parties as free samples or the use of BCI
       Array Chips by BCI for sales demonstration purposes or for quality
       control or other internal, non-revenue generating purposes shall not be
       included in the calculation of Net Sales.
       

       In the event a BCI Array Chip is sold in combination with other
       apparatus or products, as part of a kit, or in any other combination,
       and the BCI Array Chip is not separately valued on the invoice or other
       document evidencing such sale, the Net Sales of the BCI Array Chip shall
       be the then current list price for the BCI Array Chip when sold
       separately or, in the absence of such list price, shall be determined by
       multiplying the aggregate selling price of the combination by a fraction
       the numerator of which shall be BCI's standard costs for the BCI Array
       Chip and the denominator of which shall be BCI's standard cost for the
       total combination at the time of the sale.  In the event that both the
       BCI Array Chip and other product have separate list prices but are being
       sold at a combination price which is less than the total of the separate
       list prices, then the Net Sales of the BCI Array Chip shall be
       determined by multiplying the invoice price charged for the combination
       by a fraction, the numerator of which is the list price of the 

                                     -5-

<PAGE>

       BCI Array Chip and the denominator of which is the sum of the list prices
       of the BCI Array Chip and such other products.
       

1.13   "PATENT RIGHTS" shall mean all applications for patent (and any
       continuation or continuation-in-part of such applications) and patents
       (and reissues of such patents), filed or issued in any country of the
       world, (a) now owned or controlled by Affymetrix or at any time during
       the seven years and six months commencing with the Effective Date owned
       or controlled by Affymetrix and (b) relating to or useful in the
       manufacture or use or processing of Array Chips; provided that Patent
       Rights shall not include the specific claims of any such applications
       or patents related to:  (i) photolithographic means or methods for the
       manufacture of Array Chips, or (ii) specific genes, or (iii) computer
       software for using the data generated from the use of Array Chips,
       or (iv) readers or other instrument systems for using Array Chips to
       perform analyses, or (v) pre-treatment of samples prior to their
       interaction with an Array Chip.  For purposes of this definition, a
       patent or application for patent is controlled by Affymetrix if
       Affymetrix is a licensee under such patent or application and Affymetrix
       has the right to grant sublicenses to third parties, in each case
       without regard to whether Affymetrix would thereby be responsible
       for reporting to and/or paying royalties to such third party as a result
       or as a consequence thereof or as a result or consequence of BCI's use
       of such patent or application.  If a patent or application for patent is
       controlled by Affymetrix it shall be sublicensed to BCI at the same
       royalty rate as Affymetrix pays to its licensor and subject to the same
       restrictions 

                                     -6-

<PAGE>

       and obligations as apply to Affymetrix promptly after Affymetrix' 
       acquisition of such control.
       
                                          
                     ARTICLE 2.0  REPRESENTATIONS AND WARRANTIES


       Affymetrix represents and warrants that (a) it owns or otherwise has the
right to grant the licenses and rights provided for herein under all of the
applications or patents presently in the Patent Rights, and (b) it will use
commercially reasonable efforts to obtain the right in any license agreement it
hereafter enters with third parties to obtain rights to applications for patent
or patents of such third parties wherein the applications for patent or patent
are useful or necessary for making or using Array Chips and not subject to
exclusions (i)-(v) of the definition of Patent Rights, to pass such license on
to BCI under the same terms and conditions as those granted to Affymetrix by
such third parties.

                                          
                           ARTICLE 3.0   LICENSE GRANT


3.1    LICENSE GRANT - Subject to the remainder of this Paragraph 3.1,
       Affymetrix hereby grants to BCI and BCI accepts a royalty bearing,
       non-exclusive, world-wide right and license under the Patent Rights 
       (without the right to grant sublicenses) to (a) make, have made, import,
       use, sell, lease and otherwise dispose of Licensed Products in all 
       fields, uses and applications except for the Bacteriology Field, (b) to
       practice Licensed Processes, and (c) to pass on to its direct and 
       indirect customers of Licensed Products the right to practice Licensed 
       Processes on any 

                                    -7-

<PAGE>

       instrument or system distributed by BCI under a BCI trademark. The 
       foregoing license is subject to the following provisos:  (a) the 
       exception as to the Bacteriology Field shall be only for so long
       in time and only to the extent that Affymetrix is excluded from granting
       licenses to others in such Field by the license agreement with
       BioMerieux in effect as of the Effective Date; and (b) the right to have
       Licensed Products made for BCI by third parties shall not extend to any
       third party which Affymetrix has informed BCI is, at the time of BCI's
       intention to use such third party as a supplier, an infringer of the
       Patent Rights and against which Affymetrix is either in negotiation to
       grant them a license or against which Affymetrix intends to bring
       litigation to halt such infringement either within the next six (6)
       months or within six (6) months of the conclusion of any pending
       litigation against another party involving the Patent Rights, unless the
       third party intended supplier ceases its infringement or takes a license
       from Affymetrix.
       

       3.1.1   BCI shall notify Affymetrix in writing of any third party that
               BCI intends to use as a supplier of BCI Array Chips under the
               license of Paragraph 3.1.  Affymetrix shall, not later than ten
               (10) business days after receipt of such notice, inform BCI, in
               writing, whether such third party is an infringer of the Patent
               Rights and Affymetrix is either in negotiation to grant such
               third party a license or Affymetrix intends to bring litigation
               against such third party to halt such infringement within the
               next six (6) months or within six (6) months of the conclusion of
               any pending litigation against another party involving the Patent
               Rights.  If Affymetrix fails to provide such notice 

                                     -8-

<PAGE>

               then BCI may use such third party as a supplier of BCI Array 
               Chips under the license of Paragraph 3.1.  If Affymetrix 
               notifies BCI that such third party is an infringer of the 
               Patent rights but fails to grant a license within six (6) 
               months of such notice or to bring a lawsuit to halt such
               infringement within the time periods of the second sentence
               hereof, then BCI may use such third party as a supplier of
               BCI Array Chips under the license of Paragraph 3.1.
       

3.2    PATENT MARKING - BCI shall attach a label or product insert on each
       Licensed Product reasonably reflecting patent numbers of issued
       U.S. patents covering such Licensed Product and owned by Affymetrix and
       will reasonably modify such labels or inserts periodically at the
       direction of Affymetrix to add or delete patent numbers.
       

3.3    NOTIFICATIONS OF NEW PATENT RIGHTS - Affymetrix shall on or about each
       anniversary of this Agreement inform BCI of any U.S. patents which have
       issued in the preceding twelve (12) months which fall within the
       definition of Patent Rights of Paragraph 1.13 and each patent which is
       controlled by Affymetrix wherein the agreement granting such control was
       signed in the preceding twelve (12) months.  Notwithstanding the
       foregoing or anything in this License Agreement to the contrary,
       the failure of Affymetrix to notify BCI of an addition to the Patent
       Rights in accordance with this Paragraph 3.3 shall have no effect on the
       rights granted to BCI under Paragraph 3.1 and such applications and
       patents shall be included in the Patent Rights without regard to whether
       BCI does or does not receive such notice.

                                    -9-

<PAGE>

                      ARTICLE 4.0    ROYALTIES AND ROYALTY REPORTS
       

4.1    ROYALTIES - Subject to Paragraph 4.2 and Paragraphs 4.1.1, BCI shall pay
       Affymetrix for all of the licenses and rights granted under this License
       Agreement, a running royalty of [          ](1) for each Gene on each BCI
       Array Chip used for Expression Analysis and [         ](2) of Net Selling
       Price for [          ](3), in each case sold by BCI to an 
       unaffiliated third party or used by BCI on behalf of an unaffiliated 
       third party.  No royalty shall be due from BCI to Affymetrix for BCI 
       Array Chips which are:  (a) transferred by BCI to an unaffiliated third 
       party as free samples, or (b) used by BCI for sales demonstration 
       purposes, or (c) used by BCI for quality control, testing or any other 
       internal, non-revenue generating purposes.
       
       4.1.1   The royalty of Paragraph 4.1.1 for a BCI Array Chip used for
               [          ](4) shall be the applicable royalty to be paid to
               Affymetrix only so long as such royalty, when converted to a
               percentage of the actual market selling price (to distributors or
               end users) of an Array Chip which is competitive with such BCI
               Assay Chip and is sold by a party other than BCI (which party is
               not infringing the intellectual property rights of Affymetrix
               without a license from Affymetrix where Affymetrix is using
               reasonable efforts to enforce its patent rights against such
               party through litigation) is less than [          ](5) of such
               selling price.  In such event, BCI may require that the basis of
               paying royalties be converted from the foregoing fixed amount of
               [          ](6) to a [          ](7).

(1) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(2) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(3) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(4) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(5) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(6) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(7) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.


                                    -10-

<PAGE>

               of Net Sales.  BCI shall notify Affymetrix, in writing, of the 
               occurrence of such event and that the mechanism described in 
               this Paragraph 4.1.1 should be invoked with respect to a BCI 
               Array Chip.  The parties shall promptly meet and use their best 
               efforts to negotiate as to whether adjustment in the royalty 
               rate is appropriate, and if appropriate such new royalty rate.  
               If the parties cannot agree within ninety (90) days of such 
               notice, all royalties [       ](8) shall be placed in escrow 
               and the matter shall be submitted to arbitration for resolution 
               pursuant to Paragraph 13.2 below. The parties agree that the 
               following is an illustration of their intent:  [        ](9). 
               For purposes of this Paragraph an Array Chip is competitive 
               with a BCI Array Chip if such Array Chip is directed to the 
               same or substantially the same set of Genes 

(8) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

(9) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
    SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.


                                    -11-

<PAGE>

               as the BCI Array Chip.  If the parties cannot agree to a royalty
               percentage, the issue will be submitted to arbitration in
               accordance with Article 13.0 hereof.
          

       4.1.2   The royalties herein assume that profits by BCI in association
               with Array Chips sales are primarily or exclusively derived from
               sales of Array Chips.  In the event that material profits are
               derived primarily from other sources (such as associated reagent
               sales), the parties shall promptly meet and use their best
               efforts to negotiate an alternative definition of Net Sales
               to account for such sales.
       

4.2    ROYALTY STACKING - If, at any time during the life of this License
       Agreement, BCI discovers that any BCI Array Chip or the use thereof
       infringes claims of an unexpired patent or patents other than those in
       the Patent Rights BCI may, if it has not already done so, negotiate with
       the owner of such patents for a license on such terms as BCI deems
       appropriate.  Should the license with the owner of such patents
       require the payment of royalties or other consideration to such owner
       then the royalties otherwise payable under this License Agreement shall
       be reduced [        ](10) based on the value of the patents other than 
       those in the Patent Rights relative to the Patent Rights licensed 
       under this Agreement.  The parties shall meet promptly after BCI takes 
       the license under such other patents to agree on the relative value of 
       such patents and the amount of royalty reduction.  If the parties 
       cannot agree the issue may be submitted to arbitration in accordance 
       with Article 13.0 hereof.

(10) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
     SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      -12-

<PAGE>
       
4.3    ROYALTY REPORTS - BCI shall, commencing with the calendar quarter which
       includes its first sale of a BCI Array Chip and each calendar quarter
       thereafter, not later than forty-five (45) days after the close of its
       accounting books and records for such quarter, provide to Affymetrix an
       accounting report of the type and quantity of each BCI Array Chip sold
       by BCI during such calendar quarter and the Net Sales received
       therefrom.  The royalty due and payable to Affymetrix shall accompany
       such report.
       
4.4    BOOKS AND RECORDS - BCI shall keep or cause to be kept books, records
       and accounts in accordance with generally accepted accounting principles
       consistently applied covering BCI's activities hereunder and containing
       all information necessary for the true and accurate determination of the
       amounts earned and paid hereunder.  BCI shall, not more than once per
       year and upon prior reasonable written notice from Affymetrix,
       permit a certified public accountant appointed and paid for by
       Affymetrix (the "Auditor") and reasonably acceptable to BCI to inspect
       each BCI facility manufacturing BCI Array Chips and to review the
       previous two (2) years books, records and accounts to verify the amounts
       earned by Affymetrix and paid by BCI hereunder.  The Auditors shall
       furnish to both parties reports stating only its findings during such
       inspection as to the accuracy, or the nature and extent of any
       inaccuracy of such books, records, accounts and payments.
          

       4.4.1   Any deficiency identified by the Auditor between the amounts
               actually earned by Affymetrix under this Article 4.0 and the
               amounts reported 

                                    -13-

<PAGE>

               to be earned and paid on by BCI in accordance with Paragraph 4.3
               hereof shall, unless disputed by BCI, be paid to Affymetrix 
               within thirty (30) days of receipt by BCI of the Auditor's 
               report.  BCI shall also pay interest on the undisputed
               amount at the rate of one percent (1%) per month.  The parties
               agree to diligently negotiate and promptly settle any disputes as
               to the amount of royalties earned by Affymetrix and payable by
               BCI hereunder.  If the deficiency between the amount actually due
               to Affymetrix as reported by the Auditor and the amount actually
               paid to Affymetrix by BCI is greater than ten percent (10%) in
               Affymetrix' favor then BCI shall reimburse Affymetrix for the
               actual and reasonable expenses of the Auditor.
       
4.5    TAXES ON ROYALTIES - All payments provided for in this License Agreement
       refer to lawful money of the United States of America.  All payments
       shall be made by BCI to Affymetrix at the office of Affymetrix
       designated above and shall be made in the full amounts as herein
       specified; provided, however, that deduction may be made from such
       payments by BCI for amounts required to be withheld and paid by BCI in
       respect of any income tax levied or assessed upon such payments by,
       and in accordance with the laws of, any foreign government or taxing
       authority.  Affymetrix shall have the right at any time or from
       time-to-time to contest by appropriate proceedings the validity or 
       amount of any such income tax withheld.  If so requested by Affymetrix,
       BCI will make such payments under protest, and, on behalf and at the 
       expense of Affymetrix, take such other action and render 

                                     -14-

<PAGE>

       all reasonable assistance that may be required by Affymetrix in the 
       prosecution of any such proceedings.  BCI will obtain and forward to 
       Affymetrix tax credit receipts or vouchers for all income taxes thus
       withheld and paid by BCI.
       
4.6    ROYALTIES EARNED IN FOREIGN CURRENCY - In the event that either Net
       Sales or the royalties set forth above are initially calculated in a
       foreign currency, conversion shall be made in each instance by employing
       the closing transfer buying rate for United States dollars quoted by the
       Wall Street Journal, for the last business day of the calendar quarter
       which the payment covers; provided, however, that if a foreign currency
       not listed in the Wall Street Journal is involved, then the closing
       transfer buying rate quoted by Citibank (New York) shall be employed in
       effecting such conversion thereof.
                                          
                                          
                        ARTICLE 5.0   CONSTRUCTION OF PATENTS
       

       If a judgment or decree is entered, which becomes final
through the exhaustion of all permissible applications for rehearing or review
by a superior tribunal, or through the expiration of the time permitted for such
applications (hereinafter referred to as an "irrevocable judgment"), on the
validity, scope, enforceability or priority of any claim or claims of any patent
or patent application included in the Patent Rights the construction placed upon
any such claim or claims by such irrevocable judgment shall be thereafter
followed with respect to acts occurring thereafter.

                                    -15-

<PAGE>

       If such irrevocable judgment holds any claim in the Patent Rights
invalid or unenforceable or is adverse to the patent in the Patent Rights
containing such claim as to inventorship, or construes all applicable claims in
a patent in the Patent Rights so as not to cover one or more BCI Array Chips,
BCI shall be relieved thereafter from payment of royalties under Article 4.0
hereof, as to such BCI Array Chips sold after the date of such
irrevocable judgment covered only by such claim or claims to which such
irrevocable judgment is applicable, and from the performance of those other acts
which may be required by this License Agreement only as to such claim or claims.
                                          

                      ARTICLE 6.0   PROSECUTION OF INFRINGERS


       If BCI determines that a third party is infringing a claim of a patent
in the Patent Rights by making, using or selling a product which competes with a
BCI Array Chip then being sold by BCI, it shall notify Affymetrix thereof in
writing.  Such notice shall include information in BCI's possession relevant to
such third party and the competing product.  Affymetrix shall have ninety (90)
days in which to either obtain the consent of such third party to discontinue
such infringement or to exercise its right to bring an action to cause such
infringement to cease.  Affymetrix shall have no obligation to bring an action
for infringement; provided however, if Affymetrix does not obtain the consent of
such third party to cease infringement or does not bring suit against the third
party under the patent, then BCI shall have the right to discontinue paying
royalties under the effected patent for BCI Array Chips until either the third
party discontinues its infringing activity or Affymetrix brings a
lawsuit against the third party for such infringement.

                                    -16-

<PAGE>

                       ARTICLE 7.0   TERM AND TERMINATION


7.1    TERMINATION BY AFFYMETRIX - If BCI shall at any time be in material
       breach of this License Agreement, including but not limited to, default
       on any payment hereunder, or of the making of any report hereunder, or
       shall make any materially false report and should fail to remedy such
       material breach within sixty (60) days after written notice thereof
       by Affymetrix, the latter may, at its option, terminate this License
       Agreement by notice to such effect, provided that such termination shall
       not release BCI from its obligation to pay Affymetrix royalties or other
       sums due and accrued prior to the date of such termination.
       

7.2    TERMINATION BY BCI - BCI shall have the right upon three (3) months
       prior written notice to Affymetrix to terminate this License Agreement
       in its entirety, such surrender being operative to relieve BCI, as of
       the effective date of said notice, of all obligation to pay royalties
       which would otherwise have accrued thereafter pursuant to this
       Agreement.  Such termination or surrender shall not relieve BCI of its
       obligation to pay royalties or other sums due and accrued prior to the
       effective date of such notice.
       

7.3    TERM - Unless previously terminated as provided herein, the life of this
       License Agreement and the license granted herein shall run from the
       Effective Date to the end of the term of the last expiring patent now or
       hereafter included in the Patent Rights.

                                    -17-

<PAGE>

7.4    CONTESTING VALIDITY - In the event that BCI or its Affiliates contests
       the validity of one or more of the licensed patents or applications
       within the Patent Rights, the licenses to such patents or applications
       (and no others) shall immediately terminate.
                                          
                                          
                          ARTICLE 8.0   EXERCISE OF RIGHTS
       

       The failure by one of the parties under this License Agreement to assert
its rights for any breach of this License Agreement shall not be deemed a waiver
of such rights.  The rights and remedies specified herein, except those
specified as exclusive, are in addition to and shall not restrict any right or
remedy either party may have at law or in equity for any breach of this License
Agreement.

                                          
                              ARTICLE 9.0   ASSIGNMENT


       BCI may not assign this License Agreement in whole or in part without
obtaining the prior written approval of Affymetrix, except that BCI shall have
the right to assign this License Agreement without the consent of Affymetrix to
any Affiliate and to any successor of its entire business or all or
substantially all of the assets of its entire business; provided that BCI may
not sell such Affiliate or its assets other than as part of a transaction
involving BCI as a whole so long as the assets of such Affiliate include this
License Agreement.
                                          
                                          
                           ARTICLE 10.0   FAVORED LICENSEE

                                     -18-

<PAGE>

       In the event that after the Effective Date Affymetrix enters into a
license agreement with a third party in which agreement such third party is
licensed to make, use or sell one or more Array Chips under the Patent Rights
(or any part thereof) which BCI is entitled to make, use and sell under this
License Agreement, then Affymetrix will notify BCI in writing within thirty (30)
days of entering such an agreement and describe the following terms of any
such agreement:

       (i)     the scope of the license including the Genes utilized in or
               sought to be identified by the Array Chips covered in such
               license.

       (ii)    the royalty rate

       (iii)   any cross license consideration or other consideration paid by
               the licensee; and, if applicable,

       (iv)    the basis of Affymetrix' belief that the financial terms of such
               agreement are not more favorable than those given to BCI under
               this License Agreement.
          
       Subject to the proviso hereafter, if Affymetrix determines in good faith
in the exercise of reasonable business judgment (and not for the purpose of
depriving BCI of its rights under this Article 10.0) that the financial terms of
the third party license are less favorable than this License Agreement, then no
terms of this License Agreement shall be changed; provided that, if BCI
disagrees with Affymetrix' conclusion it may submit the issue to arbitration in
accordance with Article 13.0 hereof.  If Affymetrix determines that the
financial terms of the third party license are more favorable than this License
Agreement, then Affymetrix shall give BCI the benefit of the more favorable
financial terms for the products licensed to such third party; provided that the
royalty shall be adjusted in a manner that accounts for all other terms of the

                                    -19-

<PAGE>

license agreement with a third party; provided further that if BCI disagrees
with the royalty adjustment provided by Affymetrix it may submit the issue to
arbitration in accordance with Article 13.0 hereof.  For the avoidance of doubt,
any BCI Array Chips which are covered by the grant of license under this License
Agreement but are not Array Chips included in the license granted to the third
party, shall remain at the royalty rate of this License Agreement and only the
BCI Array Chips which are covered by the grant of the license under this License
Agreement and are Array Chips included in the license granted to the third party
shall have the benefit of the more favorable financial terms.

                                          
                            ARTICLE 11.0   NOTICES


       All notice and payments required or permitted to be given hereunder
shall be in writing and addressed to the respective parties as follows:

       
       If to Affymetrix:      Affymetrix, Inc.
                              3380 Central Expressway
                              Santa Clara,  California 95051
                              Attention:
                                        ----------------------------

       If to BCI:             Beckman Coulter, Inc.
                              4300 North Harbor Boulevard
                              Fullerton,  California  92834-3100
                              Attention:  President

       With a copy to:        Beckman Coulter, Inc.
                              4300 North Harbor Boulevard
                              Fullerton,  California  92834-3100
                              Attention:  General Counsel

                                    -20-

<PAGE>

or such other addresses as may be designated by the respective parties in
writing.  A notice shall be deemed given the earlier of the date when actually
received if sent by messenger or facsimile (with notice of receipt in good order
requested and received) or three (3) days after deposit in the United States
registered or certified mail, postage prepaid, and properly addressed.

                                          
                        ARTICLE 12.0   SECTION HEADINGS


       Section headings are for convenience only and shall not be construed to
limit or extend the meaning of any portion of this License Agreement.

                                          
                 ARTICLE 13.0   LAW GOVERNING AND CONSTRUCTIONS
                                          

13.1   APPLICABLE LAW - This License Agreement shall be governed by and
       construed in accordance with the laws of the State of California as if
       it has been delivered in California, and all acts performed or required
       to be performed hereunder have been performed entirely within such
       state, not including, however any conflicts of law rule of California
       which may direct or refer such determination to the laws of any other
       state or country.  Neither party shall be entitled to nor request
       injunctive or other equitable relief prior to adjudication on the
       merits.
       

13.2   MEDIATION AND ARBITRATION - Any controversy or conflict involving  this
       License Agreement, its interpretation or the respective rights or
       obligations of the parties shall 

                                    -21-

<PAGE>

       first be submitted to their respective Vice-Presidents for resolution.
       If they cannot agree, the controversy shall be submitted to mediation
       to be held in a mutually agreeable neutral place.  If the parties still
       cannot settle the controversy or reach an accommodation, the matter 
       shall be submitted to binding arbitration to be conducted in 
       California at a location to be mutually agreed in accordance with the 
       following rules:
       

       (a)     There shall be a panel of three (3) arbitrators, all of whom
               shall be lawyers and at least two (2) of which shall be competent
               to fully understand the technology relating to Array Chips.  If
               the parties cannot agree on the selection of the three (3) then
               each shall pick one (1) arbitrator and the two (2) so chosen
               shall select the third.
          

       (b)     All disputes which are not specifically raised by the parties in
               the arbitration process shall be forever waived.



                                    -22-

<PAGE>

       (c)     The arbitration proceeding shall be governed by (i) the rules and
               understandings set forth in this Paragraph 13.2 or as hereafter
               agreed upon in writing by the parties, and (ii) to the extent not
               inconsistent with such rules and understandings, by the
               Commercial Arbitration Rules of the American Arbitration
               Association.
          

       (d)     The parties agree to refrain from filing a lawsuit with regard to
               any aspect of their controversy and to abide by and perform any
               award rendered by the arbitrators.  The parties further agree
               that a judgment of a Court having jurisdiction may be entered
               upon the award and an execution may be issued for its collection.
          

       (e)     At least two (2) of the panel of arbitrators must agree on each
               point in controversy for an award to be rendered.
          

       (f)     The arbitration hearing shall be convened within forty-five (45)
               days of request therefor by either party.  The request shall be
               in writing and sent in accordance with Article 11.0.  The hearing
               shall be limited to three days:  Each party shall have a maximum
               of eight (8) hours to put on its main case and four (4) hours for
               rebuttal.  Neither party shall engage in extended
               cross-examination or other tactics which have the effect of
               substantially altering this allocation.

                                      -23-

<PAGE>

       (g)     The parties agree to exchange all documents they intend to
               produce at the hearing at least thirty (30) days in advance of
               the opening of the arbitration hearing.  There will be no taking
               of depositions, service of interrogatories or any other form of
               discovery other than producing documents relevant to the
               proceedings and neither party may compel the appearance of the
               other party's employees, officers, directors or consultants.
          

       (h)     The arbitrator's decision must be rendered within thirty (30)
               days after completion of the arbitration hearing.
          

       (i)     A transcript may, at the option of the parties, be made.  Either
               party may, at its expense, tape record or video tape the
               proceedings.
          

       (j)     All applicable common law or statutory privileges such as
               attorney-client or attorney work product shall be applicable to
               the arbitration proceedings.
          

       (k)     Either party may, at its option, use prepared testimony as long
               as the witness whose testimony is so presented is available to
               the other party for cross-examination.
          

       (l)     Each party shall bear its own expenses for the arbitration and
               they shall each share equally in the expenses and fees of the
               arbitration panel.

                                     -24-

<PAGE>

                          ARTICLE 14.0    MISCELLANEOUS


14.1   Nothing in this License Agreement shall be construed as conferring any
       right to use in advertising, publicity, or other promotional activities
       any name, trade name, trademark, or other designation of either party
       hereto without the express written approval of the other party.
       

14.2   Affymetrix makes no warranties as to the validity or scope of any of the
       Patent Rights, or that any manufacture, sale, use, or other disposition
       of the products licensed hereunder will be free from infringement of
       patents, utility models, and/or design patents of third parties. 
       Nothing in this License Agreement shall be considered as conferring any
       warranty or representation as to the usefulness, marketability,
       or merchantability of any products sold within the scope of the licenses
       hereunder.  Affymetrix and BCI agree to hold the other harmless from any
       personal injury or products liability claims made as a result of the
       sale of products licensed hereunder.
       

14.3   The Parties will retain the terms of this License Agreement in strict
       confidence, except as may be required by regulatory agencies or courts,
       and will then use all reasonable precautions to maintain the terms of
       this License Agreement confidential.
       

14.4   BCI and Affymetrix represents that they are familiar with the Export
       Administration Regulations comprising the compilation of official
       regulations and policies governing the export licensing of commodities
       and technical data 

                                     -25-

<PAGE>

       promulgated by the United States Department of Commerce, Bureau of 
       International Commerce, Office of Export Administration.  Notwithstanding
       any other provisions of this License Agreement, and each assures the 
       other that with respect to all information and licenses furnished by or
       under this License Agreement, that it will comply with such official 
       regulations.
       

14.5   In the event that any provision of this License Agreement is held
       invalid or unenforceable for any reason, such unenforceability shall not
       affect the enforceability of the remaining provisions of this License
       Agreement, and all provisions of this License Agreement shall be
       construed so as to preserve the enforceability hereof.
       

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

14.7   This License Agreement has been drafted on the basis of mutual
       understanding after considerable negotiation and neither party shall be
       prejudiced as being the drafter thereof.



                                     -26-

<PAGE>

                ARTICLE 15.0   ENTIRE AGREEMENT, MODIFICATIONS, ETC.


       This instrument contains the entire and only agreement between the
parties relative to the subject matter hereof and supersedes all previous
negotiations, representations, undertakings and agreements both written and oral
heretofore made between the parties as to the subject matter.  Any
representation, promise or condition in connection herewith not specifically
incorporated herein shall not be binding upon either party.


       No modification, renewal, extension, waiver, cancellation or termination
of this License Agreement or of any of the provisions herein contained shall be
valid until and unless made in writing and signed on behalf of the respective
parties by duly authorized officers thereof.


       IN WITNESS WHEREOF, the parties have respectively caused this License
Agreement to be executed on the dates hereinafter indicated.



Beckman Coulter, Inc.                        Affymetrix, Inc.

By:                                          By:                      
  -----------------------------------          -----------------------------
Title:                                       Title:                        
     --------------------------------             --------------------------
Date:                                        Date:                         
    ---------------------------------            ---------------------------


                                    -27-

<PAGE>

                                     EXHIBIT A





The following companies and their subsidiaries and Affiliates:


              [        ](11) 




(11) CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED 
     SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.



                                    -28-

<PAGE>

                                                      Exhibit 10.35

                                    July 29, 1998



Mr. Steve Fodor, President
Affymetrix, Inc.
3380 Central Expressway
Santa Clara, California 95051


Dear Mr. Fodor:

This letter, with your signature below, will constitute an agreement between
Affymetrix, Inc. ("Affymetrix") and Beckman Coulter, Inc. ("BCI") and will
govern the order of precedence and effective dates of the following document
sets:

I.     Consortium Agreement and its Exhibits, including Exhibits thereto
       (jointly the "Consortium Agreement").
       
II.    Asset Purchase Agreement and its Exhibits, including Exhibits thereto
       (jointly the "Asset Purchase Agreement").
       
III.   License Agreement from Affymetrix to BCI (the "License").
       
       Notwithstanding that each of the foregoing Agreements are signed
contemporaneously with this agreement and thus, by their terms and on their face
have the same effective date as this agreement, it is our intent that certain of
such Agreements not come into full force and effect on the above date and that
this agreement decide the precedence and order of such Agreements coming into
full force and effect.  We have agreed as follows:

1.     The Consortium Agreement will come into full force and effect on even
       date herewith.  The parties will promptly and diligently exercise their
       best efforts, consistent with the limitations of Paragraph 5.3 of the
       Consortium Agreement, to obtain a non-exclusive license for Affymetrix
       under the Southern Patents (as such term is defined in such Paragraph)
       on reasonable terms and conditions.  For purposes of this agreement
       "reasonable terms and conditions" means terms and conditions
       substantially equivalent 


                                     -1-

<PAGE>

       to those granted Beckman Instruments in the Isis Agreement (as that term 
       is hereafter defined) and does not include a requirement that Affymetrix 
       grant a license under its intellectual property to Oxford Gene 
       Technology ("OGT").  If OGT grants the requested license under 
       reasonable terms and conditions within the time specified in such 
       Paragraph 5.3 then the parties shall thereupon terminate the Asset 
       Purchase Agreement and the License Agreement and their relationship 
       shall be bound and determined solely by the Consortium Agreement.  BCI 
       shall refund to Affymetrix $900,000 of the $5,900,000 payment made by 
       Affymetrix under the Asset Purchase Agreement.  If OGT refuses to grant 
       the requested license under reasonable terms and conditions within the 
       time specified in such Paragraph 5.3 or any extension thereof agreed by 
       Affymetrix and BCI then the parties shall, subject to the next sentence 
       hereof, thereupon, terminate the Consortium Agreement.
              
2.     The Asset Purchase Agreement will come into full force and effect upon
       the termination of the Consortium Agreement in accordance with Paragraph
       1.
       
3.     BCI represents that as of the day prior to this agreement to its
       Knowledge (as that term is defined in the Asset Purchase Agreement) the
       Isis Agreement is in full force and effect and to its Knowledge that the
       Acquired Assets (as that term is defined in the Asset Purchase
       Agreement) includes all of BCI's assets relating to the business in
       products licensed under the Isis agreement.  For the avoidance of doubt,
       the parties agree that U.S. Patent No. 5,653,939 and its U.S. and
       foreign counterparts is not related to the business in products licensed
       under the Isis Agreement and is not an Acquired Asset.  If, for any
       reason, the LLC established by the Asset Purchase Agreement is deemed
       not to be an Affiliate of Affymetrix, as that term is defined in the
       Patent License between Isis Innovation Limited and Beckman Instruments,
       Inc. revised on April 17, 1996 (the "Isis Agreement"), and thus not
       entitled to access to and use of the Southern Patents, then the License
       Agreement shall come into full force and effect.  It is expressly
       understood and agreed that if for any reason Affymetrix shall be deemed
       not to be the assignee of the Isis Agreement under the Asset Purchase
       Agreement that Affymetrix shall have no right of action or recourse
       against BCI for breach of contract or breach of warranty or failure of
       consideration or tort or under any other legal or equitable theory and
       no right to terminate or rescind or reform the Asset Purchase Agreement
       nor to direct, indirect, special or consequential damages of any kind or
       nature nor shall Affymetrix be entitled to demand or receive return of
       the consideration paid by Affymetrix to BCI under either the Asset
       Purchase Agreement or the License Agreement; provided that if the
       foregoing representations are knowingly false Affymetrix may demand and
       receive return of all compensation paid to BCI under the Asset Purchase
       Agreement.  Affymetrix recognizes and accepts 

                                     -2-

<PAGE>

       that it enters the Asset Purchase Agreement and Affymetrix side letter
       of July 31, 1998 and the License Agreement entirely at its own risk.
       
       



       This agreement contains the full understanding of the parties relative
to it subject matter and fully supersedes any and all prior understanding or
agreement, whether oral or in writing pertaining to such subject matter.  This
agreement may only be modified in a writing signed by both of the parties.  The
covenants and agreements contained herein shall be binding upon and inure to the
benefit of the heirs, executors, administrators, personal representatives,
successors and assigns of the parties.

       This agreement, including its existence, validity, construction and
operating effect and the rights of each of the parties hereto shall be governed
by and construed in accordance with the laws of the State of California.

       If the foregoing properly sets forth our agreement and intent, please
sign both copies in the space indicated below and return one copy to me; the
second copy is for your files.



                                   Very truly yours,

                                   Beckman Coulter, Inc.


                                   by:    /s/ John Warcham
                                     -------------------------------
                                   title: Chief Executive Officer
                                        ----------------------------

Understood and Accepted:

Affymetrix, Inc.


by: /s/ Stephen P.A. Fodor
  -------------------------------------------
title:  President and Chief Executive Officer
     ----------------------------------------


                                      -3-

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ITEM 1 OF
THE COMPANY'S FORM 10-Q FOR THE PERIOD ENDED SEPTEMBER 30, 1998 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                           1,232
<SECURITIES>                                    88,738
<RECEIVABLES>                                    8,500
<ALLOWANCES>                                         0
<INVENTORY>                                      4,177
<CURRENT-ASSETS>                               104,879
<PP&E>                                          34,012
<DEPRECIATION>                                 (8,713)
<TOTAL-ASSETS>                                 140,949
<CURRENT-LIABILITIES>                           11,341
<BONDS>                                            327
                           49,857
                                          0
<COMMON>                                       159,272
<OTHER-SE>                                    (84,848)
<TOTAL-LIABILITY-AND-EQUITY>                   140,879
<SALES>                                         14,941
<TOTAL-REVENUES>                                35,845
<CGS>                                            9,421
<TOTAL-COSTS>                                    9,421
<OTHER-EXPENSES>                                47,087
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,424
<INCOME-PRETAX>                               (18,239)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (18,239)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (18,239)
<EPS-PRIMARY>                                   (0.80)
<EPS-DILUTED>                                   (0.80)
        

</TABLE>


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