AFFYMETRIX INC
10-Q, 1998-08-14
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                   FORM 10-Q
 
(MARK ONE)
 
  /X/    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934 FOR THE PERIOD ENDED JUNE 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>
                 CALIFORNIA                                     77-0319159
       (State or other jurisdiction of                       (I.R.S. Employer
       incorporation or organization)                     Identification Number)
 
    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 JUNE 30, 1998: 22,918,310
 
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- --------------------------------------------------------------------------------
<PAGE>
                                AFFYMETRIX, INC.
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                 PAGE
                                                                                                                 -----
<S>        <C>                                                                                                <C>
PART I. FINANCIAL INFORMATION
 
Item 1.    Financial Statements
 
           Condensed Balance Sheets at June 30, 1998 and December 31, 1997..................................           3
 
           Condensed Statements of Operations for the Three and Six Months Ended
             June 30, 1998 and 1997.........................................................................           4
 
           Condensed Statements of Cash Flows for the Six Months Ended June 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............           8
 
PART II. OTHER INFORMATION
 
Item 3.    Use of Proceeds..................................................................................          10
 
Item 4.    Submission of Matters to a Vote of Security Holders..............................................          10
 
Item 5.    Other Information................................................................................          11
 
Item 6.    Exhibits and Reports on Form 8-K.................................................................          11
 
SIGNATURES..................................................................................................          12
</TABLE>
 
                                       2
<PAGE>
PART 1. FINANCIAL INFORMATION
 
ITEM 1. FINANCIAL STATEMENTS
 
                                AFFYMETRIX, INC.
 
                            CONDENSED BALANCE SHEETS
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                     DECEMBER 31,
                                                                                                         1997
                                                                                         JUNE 30,    ------------
                                                                                           1998
                                                                                        -----------
                                                                                        (UNAUDITED)
 
<S>                                                                                     <C>          <C>
                                                     ASSETS
 
Current assets:
  Cash, cash equivalents and short-term investments...................................   $ 104,461    $   71,573
  Accounts receivable.................................................................       6,400         6,216
  Inventories.........................................................................       3,959         2,637
  Other current assets................................................................       1,151           748
                                                                                        -----------  ------------
    Total current assets..............................................................     115,971        81,174
Net property and equipment............................................................      23,361        19,088
Other assets..........................................................................         949           908
                                                                                        -----------  ------------
                                                                                         $ 140,281    $  101,170
                                                                                        -----------  ------------
                                                                                        -----------  ------------
 
                                      LIABILITIES AND SHAREHOLDERS' EQUITY
 
Current liabilities...................................................................   $  10,982    $    9,621
Noncurrent portion of capital lease obligation........................................         389           513
Convertible redeemable preferred stock................................................      49,857        --
Shareholders' equity:
  Common stock........................................................................     159,220       158,924
  Accumulated deficit.................................................................     (79,790)      (67,269)
  Other...............................................................................        (377)         (619)
                                                                                        -----------  ------------
    Total shareholders' equity........................................................      79,053        91,036
                                                                                        -----------  ------------
                                                                                         $ 140,281    $  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   SIX MONTHS ENDED JUNE
                                                                            JUNE 30,                 30,
                                                                      --------------------  ----------------------
                                                                        1998       1997        1998        1997
                                                                      ---------  ---------  ----------  ----------
<S>                                                                   <C>        <C>        <C>         <C>
Revenue:
  Product...........................................................  $   4,752  $     942  $    8,449  $    1,362
  Contract..........................................................      5,070      1,829       9,610       2,818
  Grant.............................................................      1,249      1,971       2,764       3,370
                                                                      ---------  ---------  ----------  ----------
    Total revenue...................................................     11,071      4,742      20,823       7,550
Costs and expenses:
  Cost of product revenue...........................................      3,432        979       5,925       1,844
  Research and development..........................................      7,941      7,212      16,452      12,710
  Selling, general and administrative...............................      6,934      3,009      12,643       5,815
                                                                      ---------  ---------  ----------  ----------
    Total costs and expenses........................................     18,307     11,200      35,020      20,369
                                                                      ---------  ---------  ----------  ----------
Loss from operations................................................     (7,236)    (6,458)    (14,197)    (12,819)
Interest income, net................................................      1,312      1,249       2,371       2,687
                                                                      ---------  ---------  ----------  ----------
Net loss............................................................     (5,924)    (5,209)    (11,826)    (10,132)
Preferred Stock dividends...........................................       (695)    --            (695)     --
                                                                      ---------  ---------  ----------  ----------
Loss attributable to Common Shareholders............................  $  (6,619) $  (5,209) $  (12,521) $  (10,132)
                                                                      ---------  ---------  ----------  ----------
                                                                      ---------  ---------  ----------  ----------
Basic and diluted loss per common share.............................  $   (0.29) $   (0.23) $    (0.55) $    (0.45)
                                                                      ---------  ---------  ----------  ----------
                                                                      ---------  ---------  ----------  ----------
</TABLE>
 
                            See accompanying notes.
 
                                       4
<PAGE>
                                AFFYMETRIX, INC.
 
                       CONDENSED STATEMENTS OF CASH FLOWS
 
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                            SIX MONTHS ENDED JUNE
                                                                                                     30,
                                                                                           -----------------------
                                                                                              1998         1997
                                                                                           -----------  ----------
<S>                                                                                        <C>          <C>
Cash flows from operating activities:
  Net loss...............................................................................  $   (11,826) $  (10,132)
  Adjustments to reconcile net loss to net cash used in operating actvities:
    Depreciation and amortization........................................................        2,508       1,254
    Amortization of investment premiums, net.............................................         (174)        206
  Change in operating assets and liabilities:
    Accounts receivable..................................................................         (184)     (2,592)
    Inventories..........................................................................       (1,322)       (137)
    Other current assets.................................................................         (403)        130
    Other assets.........................................................................          (41)       (816)
    Accounts payable and other accrued liabilities.......................................          193       2,763
    Deferred revenue.....................................................................        1,156        (292)
                                                                                           -----------  ----------
      Net cash used in operating activities..............................................      (10,093)     (9,616)
Cash flows from investing activities:
    Capital expenditures.................................................................       (6,571)     (4,443)
    Proceeds from the sale of short-term investments.....................................       73,680      66,364
    Proceeds from maturities of short-term investments...................................           --      12,252
    Purchases of short-term investments..................................................     (109,991)    (44,068)
                                                                                           -----------  ----------
      Net cash (used in)/provided by investing activities................................      (42,882)     30,105
Cash flows from financing activities:
    Issuance of common stock.............................................................          296          63
    Issuance of Series AA Convertible redeemable
      Preferred Stock, net of costs......................................................       49,857          --
    Preferred Stock dividends paid.......................................................         (695)         --
    Principal payments on capital lease obligation.......................................         (114)       (101)
                                                                                           -----------  ----------
      Net cash provided by/(used in) financing activities................................       49,344         (38)
Net (decrease)/increase in cash and cash equivalents.....................................       (3,631)     20,451
Cash and cash equivalents at beginning of period.........................................        4,779      14,143
                                                                                           -----------  ----------
Cash and cash equivalents at end of period...............................................  $     1,148  $   34,594
                                                                                           -----------  ----------
                                                                                           -----------  ----------
</TABLE>
 
                            See accompanying notes.
 
                                       5
<PAGE>
                                AFFYMETRIX, INC.
 
                    NOTES TO CONDENSED FINANCIAL STATEMENTS
 
                                 JUNE 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 six months ended June 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 is recorded as earned as defined within the
specific agreements. 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. Revenue
from subscription fees earned under EasyAccess supply agreements are recorded
ratably over the term of the agreement and are recorded in "contract" revenue.
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 June 30, 1998, short-term investments 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>
                                                                        JUNE 30,    DECEMBER 31,
                                                                          1998          1997
                                                                       -----------  -------------
<S>                                                                    <C>          <C>
Raw material.........................................................   $   1,859     $     935
Work in process......................................................          48           160
Finished goods.......................................................       2,052         1,542
                                                                       -----------       ------
  Total..............................................................   $   3,959     $   2,637
                                                                       -----------       ------
                                                                       -----------       ------
</TABLE>
 
                                       6
<PAGE>
                                AFFYMETRIX, INC.
 
              NOTES TO CONDENSED FINANCIAL STATEMENTS (CONTINUED)
 
                                 JUNE 30, 1998
                                  (UNAUDITED)
 
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 six months ended June
30, 1998 and 1997 are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                               THREE MONTHS ENDED      SIX MONTHS ENDED
                                                    JUNE 30,               JUNE 30,
                                              --------------------  ----------------------
                                                1998       1997        1998        1997
                                              ---------  ---------  ----------  ----------
<S>                                           <C>        <C>        <C>         <C>
Loss attributable to common shareholders....  $  (6,619) $  (5,209) $  (12,521) $  (10,132)
Unrealized gain (loss) on securities........         78        378          33         (34)
                                              ---------  ---------  ----------  ----------
Comprehensive Loss..........................  $  (6,541) $  (4,831) $  (12,488) $  (10,166)
                                              ---------  ---------  ----------  ----------
                                              ---------  ---------  ----------  ----------
</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.
 
                                       7
<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 June 30, 1998 and for the three and six month periods ended
June 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. 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. 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. 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 SIX MONTHS ENDED JUNE 30, 1998 AND 1997
 
    Product revenue was $4.8 million and $8.4 million for the three and six
months ended June 30, 1998, respectively, compared to $0.9 million and $1.4
million in the three and six months ended June 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 $5.1 million
and $9.6 million for the three and six months ended June 30, 1998, respectively,
compared to $1.8 million and $2.8 million in the three and six months ended June
30, 1997. The increases in commercial contract revenue resulted principally from
amounts earned under the Company's EasyAccess-TM- subscription-based supply
agreements and achievement of milestones under other commercial contracts. Grant
revenue was $1.2 million and $2.8 million for the three and six months ended
June 30, 1998, respectively, compared to $2.0 million and $3.4 million in the
three and six months ended June 30, 1997. The decreases are primarily due to
lower
 
                                       8
<PAGE>
activity under government grants including grants from the Advanced Technology
Program and NIH National Center for Human Genome Research.
 
    Cost of product revenue was $3.4 million and $5.9 million for the three and
six months ended June 30, 1998, respectively, compared to $1.0 million and $1.8
million for the three and six months ended June 30, 1997. The Company has
experienced, and continues to experience, variation in the manufacturing yield
of its GeneChip products which has impacted, and may 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. In addition, the Company sells products in certain foreign
countries and thus margins may fluctuate due to changes in currency exchange
rates.
 
    Research and development expenses were $7.9 million and $16.5 million for
the three and six months ended June 30, 1998, respectively, compared to $7.2
million and $12.7 million the three and six months ended June 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 $6.9 million and $12.6
million for the three and six months ended June 30, 1998, respectively, compared
to $3.0 million and $5.8 million the three and six months ended June 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, adds management and support
staff and continues to prosecute and defend its intellectual property position
and defend against claims made by third parties.
 
    Net interest income was $1.3 million and $2.4 million for the three and six
months ended June 30, 1998, respectively, compared to $1.2 million and $2.7
million the three and six months ended June 30, 1997. The fluctuations in net
interest income result principally from variation in the Company's investment
balances.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    As of June 30, 1998, the Company's cash, cash equivalents, and short-term
investments were $104.5 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 $10.1 million for the six months
ended June 30, 1998, as compared to $9.6 million for the six months ended June
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 $6.6 million for the six months ended June
30, 1998 and $4.4 million for the six months ended June 30, 1997. Capital
expenditures during the first six months of 1998 included investments in land,
facilities and production and laboratory equipment. Financing activities for the
six months ended June 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.
 
                                       9
<PAGE>
    The Company anticipates that its existing capital resources will enable it
to maintain currently planned operations through at least 2000. However, this
expectation is based on the Company's current operating 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
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; and
other factors.
 
                          PART II.  OTHER INFORMATION
 
ITEM 3.  USE OF PROCEEDS
 
    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 June 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 June 30, 1998, the
Company estimates that it has used a portion of the net proceeds of the offering
as follows: (i) temporary investment in marketable debt securities,
$54.6million; and (ii) working capital, $30.5 million.
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
    (a) DATE OF MEETING.
 
    The Annual Meeting of the Shareholders of Affymetrix, Inc. was held on June
11, 1998.
 
                                       10
<PAGE>
    (b) DESCRIPTION OF EACH MATTER VOTED ON AND NUMBER OF VOTES CAST.
 
<TABLE>
<CAPTION>
                                                                                      FOR        AGAINST     WITHHELD
                                                                                  ------------  ----------  ----------
<C>        <S>                                                                    <C>           <C>         <C>
       1.  To elect directors to serve until the next annual meeting of
           shareholders or until their successors are elected.
 
             John D. Diekman, Ph.D..............................................    22,762,240           0      69,653
             Stephen P.A. Fodor, Ph.D...........................................    22,762,240           0      69,653
             Paul Berg, Ph.D....................................................    22,762,240           0      69,653
             Douglas M. Hurt....................................................    22,708,961           0     122,932
             Vernon R. Loucks, Jr...............................................    22,762,240           0      69,653
             Barry C. Ross, Ph.D................................................    22,762,240           0      69,653
             David B. Singer....................................................    22,762,240           0      69,653
             Lubert Stryer, M.D.................................................    22,762,240           0      69,653
             John A. Young......................................................    22,708,961           0     122,932
 
       2.  To authorize the Company to change the Company's state of
           incorporation from California to Delaware............................    14,540,291   1,504,823   5,511,696
 
       5.  To ratify the appointment of Ernst & Young LLP as independent
           auditors of the Company for the fiscal year ending December 31,
           1998.................................................................    22,806,405      10,180      15,308
</TABLE>
 
ITEM 5.  OTHER INFORMATION
 
    Pursuant to the bylaws to be effective upon the Company's reincorporation in
Delaware, stockholders who wish to propose nominees for directors or bring
matters to the Company's 1999 annual meeting of stockholders must provide
specified information to the Company no later than April 27, 1999 (unless such
matters are included in the Company's proxy statement pursuant to Rule 14a-8
under the Securities Exchange Act of 1934, as amended).
 
ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K
 
    (a) Exhibits:
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                             DESCRIPTION OF DOCUMENT
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
    *10.32   Agreement between Affymetrix, Inc. and Roche Molecular Systems, Inc. effective as of April 23, 1998.
 
    *10.33   Agreement between Affymetrix, Inc. and Enzo Diagnostics, Inc. effective as of April 24, 1998.
 
        27   Financial data schedule.
</TABLE>
 
- ------------------------
 
*   Confidential treatment requested.
 
    (b) Reports on Form 8-K. No reports on Form 8-K were filed during the
quarter ended June 30, 1998.
 
                                       11
<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.
 
<TABLE>
<S>                             <C>  <C>
August 14, 1998                 AFFYMETRIX, INC.
 
                                By:            /s/ EDWARD M. HURWITZ
                                     -----------------------------------------
                                                 Edward M. Hurwitz
                                     VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
</TABLE>
 
                                       12
<PAGE>
                                AFFYMETRIX, INC.
                                 EXHIBIT INDEX
                                 JUNE 30, 1998
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                         DESCRIPTION OF DOCUMENT
- -----------  ------------------------------------------------------------------------------------------------
<C>          <S>                                                                                               <C>
     *10.32  Agreement between Affymetrix, Inc. and Roche Molecular Systems, Inc. effective as of April 23,
               1998.
 
     *10.33  Agreement between Affymetrix, Inc. and Enzo Diagnostics, Inc. effective as of April 24, 1998.
 
      27     Financial data schedule.
</TABLE>
 
- ------------------------
 
*   Confidential treatment requested.

<PAGE>


                            COLLABORATION AGREEMENT

                         Roche Molecular Systems, Inc.

                               Affymetrix, Inc.






- ------------------------
THE SYMBOL "**" IS USED THROUGHOUT THIS EXHIBIT TO INDICATE THAT A
PORTION OF THE EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE COMMISSION


                                       1

<PAGE>

CONTENTS

<TABLE>
<C>    <S>                                                                       <C>
I.     DEFINITIONS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
II.    NO OTHER IMPLIED LICENSE; DISTRIBUTION RESTRICTIONS.. . . . . . . . . . .   6
III.   PAYMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
IV.    PRODUCT DEVELOPMENT.. . . . . . . . . . . . . . . . . . . . . . . . . . .   9
V.     LONG RANGE FORECASTS AND PERFORMANCE MEASURES.. . . . . . . . . . . . . .  11
VI.    SUPPLY AND MARKETING. . . . . . . . . . . . . . . . . . . . . . . . . . .  12
VII.   OWNERSHIP; DEVELOPMENT LICENSE; CONFIDENTIALITY . . . . . . . . . . . . .  15
VIII.  MANAGEMENT OF RELATIONSHIP; DISPUTES. . . . . . . . . . . . . . . . . . .  17
IX.    TERM AND TERMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . .  18
X.     WARRANTY AND WARRANTY DISCLAIMERS . . . . . . . . . . . . . . . . . . . .  20
XI.    LIMITED LIABILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
XII.   INDEMNITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
XIII.  GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
</TABLE>


                                       2

<PAGE>

This Agreement is entered as of February 1, 1998 (the "Effective Date") by 
and between Affymetrix, Inc. ("AFFX"), a Delaware corporation, with its 
principal place of business at 3380 Central Expressway, Santa Clara, CA 95051 
(Telephone: 408.731.5035; Fax: 408.481.4709) and Roche Molecular Systems, 
Inc. ("RMS"), a Delaware corporation, with a place of business at 1080 US Hwy 
202, Branchburg Township, Somerville, NJ 08876-3771 (Telephone: 908.253.7510; 
Fax: 908.253.7593).

I.   DEFINITIONS.

     (a)  "Affiliate" means any corporation or other business entity in which
either party to this Agreement owns or controls, directly or indirectly, at
least fifty percent (50%) of the outstanding stock or other voting rights
entitled to elect directors, or in which such party is owned or controlled
directly or indirectly by at least fifty percent (50%) of the outstanding stock
or other voting rights entitled to elect directors; but in any country where the
local law does not permit foreign equity participation of at least fifty percent
(50%), then "Affiliate" includes  any company in which such party owns or
controls or is owned or controlled by, directly or indirectly, the maximum
percentage of outstanding or voting rights permitted by local law.
Notwithstanding the foregoing, the term "Affiliate" shall not include Genentech,
Inc. a company located at 460 Point San Bruno Boulevard, South San Francisco,
California, U.S.A.

     (b)  "AFFX Development Allocation" for a Product for a period shall mean
[**] for that Product for that period.

     (c)  "AFFX Development Cost" shall mean for any particular Product: (i) an
amount of development cost determined [**], unless the parties mutually agree by
written amendment of such Development Plan to increase that number. AFFX
Development Cost shall [**.]

     (d)  "Chip" shall mean a genetic analysis chip developed by and
manufactured by AFFX according to the Specifications for the Kit in which that
Chip is to be incorporated (or according to Exhibit A, as applicable).

     (e)  "Chip Cost" shall mean the per Chip cost for each Chip associated with
a Product as calculated according to the method specified in the Development
Plan for that Product (as determined in accordance with generally accepted
accounting principles). Chip Cost for a particular Chip will vary [**.] Chip
Cost will include, without limitation, [**.] Chip Cost shall [**.] Chip Cost
shall [**.]

     (f)  "Deductible Expenses" for a period with respect to a Product shall
mean [**,] except for other expenses expressly and unambiguously excluded from
RMS Deductible Expenses in this Agreement. RMS agrees that all Deductible
Expenses for a period will be used 


                                       3

<PAGE>

fully and only for the foregoing activities in that period. [**.]  
Notwithstanding the foregoing, RMS shall pay AFFX (according to the terms and 
conditions of this Agreement) the Chip Cost of all Chips purchased from AFFX, 
and the cost of all Readers purchased from AFFX, whether such Chips or 
Readers are acquired for promotional purposes or otherwise.

     (g)  "Deficit" will have the meaning specified in the definition of "Gross
Profit" below.

     (h)  "Delivery Dates" shall mean the dates designated as such in Section
VI(b)(i).

     (i)  "Development Costs" for a Product shall mean [**.]

     (j)  "Development Cost Recoupment Percentage" with respect to each Product
shall mean a percentage of [**.]

     (k)  "Development Plan" and "Development Schedule" shall mean,
respectively, a plan and schedule determined according to the procedure in
Section IV(a).

     (l)  "Executive Steering Committee" shall have the meaning specified in
Section VIII(a)(v) below.

     (m)  "Gross Profit" for a period shall mean [**.] A negative Gross Profit
may also be referred to as a "Deficit."

     (n)  "Joint Business Revenue" for a period with respect to a Product shall
mean [**] for that Product during that period.

     (o)  "Kits" shall mean RMS-manufactured human diagnostic assay kits
incorporating a Chip and containing all necessary reagents according to the
Specifications (or according to Exhibit A, as applicable) for that Kit and sold
for a single kit price.

     (p)  "Long Range Forecast" shall mean the forecast designated as such in
Section V(a).

     (q)  "Manufacturing Facility Fee" shall mean [**].


                                       4

<PAGE>

     (r)  "Marketing Plan" shall mean for a Product for any period a written
plan that RMS will develop in conjunction with AFFX, for that Product for such
period, that the Executive Steering Committee will approve. The Marketing Plan
will set sales and marketing strategy for that Product, including, without
limitation, plans for marketing materials, clinical trials and studies under
Article IV, trade show participation, advertising, marketing efforts and the
like that AFFX will perform and the amounts to be expended and reimbursed by
RMS, as well as a non-binding suggested pricing structure for that Product and
reports that the parties will exchange related to marketing efforts. Unless a
suggested pricing structure for a period is specifically changed in a new
Marketing Plan, it will remain in effect and be deemed part of the then
applicable Marketing Plan.

     (s)  "Net Sales" means the [**.]

     (t)  "PMA" shall mean a pre-market approval with the US Food and Drug
Administration ("FDA").

     (u)  "Products" shall mean (i) those Kits set forth on Exhibit A, (ii) any
other Kits developed hereunder by mutual agreement of the parties. However,
"Products" shall not include any of the foregoing that, the Executive Steering
Committee determines are either technically or commercially not feasible, or
with respect to which RMS loses rights under relevant sections of this
Agreement.

     (v)  "Project Coordinator" shall have the meaning specified in Section
VIII(a).

     (w)  "Proprietary Information" shall have the meaning specified in Section
VII(e).

     (x)  "Reader" shall mean a reader for reading a particular Chip provided by
a party to the other party. "AFFX Readers" shall mean Readers provided by AFFX
as specified on Exhibit B. "RMS Readers" shall mean Readers provided by RMS
conforming to specifications determined as needed for a particular Chip, as
shown in the Development Plan for such Chip. Neither party shall be responsible
for any development, production, sales or other costs associated with the other
party's Readers (and such costs shall not be included in or reflected in
Development Costs for any Product or Chip).

     (y)  "RMS Development Allocation" for a Product for a period shall mean
[**.]

     (z)  "RMS Development Cost" shall mean for any particular Product [**.] 
RMS Development Cost shall [**.]  RMS Development Cost shall [**.]


                                       5

<PAGE>

     (aa) "RMS Manufacturing Cost" shall mean for any particular Product [**.]
RMS Manufacturing Cost will include [**.] RMS Manufacturing Cost shall [**.]

     (bb) "Specifications" shall mean specifications determined according to the
procedure in Section IV(a). Notwithstanding the Specifications developed by such
procedure, Specifications of specific characteristics for Chips to be sold as
part of a Product shall adhere to the base technical specifications for minimum
and maximum Chip sizes and features set forth in Exhibit C ("Chip
Specifications").

     (cc) "Third Party Patents" shall mean the patents specified in Exhibit D.

II.  NO OTHER IMPLIED LICENSE; DISTRIBUTION RESTRICTIONS.

     (a)  Except as expressly and unambiguously granted in this Agreement, no
transfer or sale of Chips to or by RMS and its Affiliates in any form will
constitute any implied or express right or license under AFFX's intellectual
property other than as follows:

          (i)  a worldwide, nonexclusive, nontransferable right to market and
          sell chips developed by AFFX prior to the Effective Date, for
          Diagnostic Applications, in accordance with all the terms and
          conditions of this Agreement (but only if and to the extent, and on
          the terms, agreed by action of the Executive Steering Committee it
          being understood that AFFX' current HIV and p53 chips are being made
          available pursuant to this Agreement and the attached Exhibit A),
          including, without limitation, the following. RMS shall have no right
          to, and will not: (a) sell or distribute chips bundled with any
          products or services except as part of Products (and will not further
          bundle the Products, directly or indirectly, with other products);
          (b) make or have made chips in any manner (except as permitted in
          accordance with Section VI(g)); (c)  sell, distribute or use chips or
          Products for any purpose or use in the fields of detection and/or
          identification of bacterial and fungal microorganisms or the
          determination of antibiotic resistance of such bacterial and fungal
          microorganisms;

          (ii) a worldwide, exclusive, nontransferable right to market and sell
          any jointly developed Kits or Products, for Diagnostic Applications,
          in accordance with all the terms and conditions of this Agreement,
          including, without limitation, the following. RMS shall have no right
          to, and will not: (a) sell or distribute Chips bundled with any
          products or services except as part of Products (and will not further
          bundle the Products, directly or indirectly, with other products);
          (b) make or have made Chips in any manner (except as permitted in
          accordance with Section VI(g)); (c) sell, distribute or use Chips
          or Products for any purpose or 


                                       6


<PAGE>


          use in the fields of detection and/or identification of bacterial and
          fungal microorganisms or the determination of antibiotic resistance
          of such bacterial and fungal microorganisms. As used herein Diagnostic
          Applications shall mean the use of products for the measurement,
          observation or determination of attributes, characteristics, diseases,
          traits or other conditions of human beings for diagnostic purposes
          wherein the results of such use are communicated directly or 
          indirectly to a patient or a patient's primary caregiver, wherein such
          products shall include reagents, enzymes, or materials, suitable to
          perform a nucleic acid amplification based assay.

     (b)  Except as otherwise agreed to by the parties, RMS shall have no rights
to market or sell, or permit others to market or sell any chips not developed
under this Agreement.

     (c)  Except as otherwise permitted hereunder, during the term of this
Agreement AFFX will not market or sell, or permit others to market or sell,
Chips developed in accordance with this Agreement. The foregoing does not apply
to: (i) the marketing or sale of newly developed chips that perform functions
similar to the functions performed by Chips (for avoidance of doubt a newly
developed chip includes, without limitation, any chip where thirty percent (30%)
of more of the masks of such chip are different than the masks of a Chip
developed under this Agreement.; or (ii) any Chips developed by AFFX prior to
the Effective Date or other than under this Agreement, even if such Chips are
used in Kits or Products hereunder.

III. PAYMENTS.

     (a)  INITIAL DESIGN FEES. With respect to each Product, RMS shall pay AFFX
a design fee of [**] for each Chip shift mask set design and a design fee of
[**] for each Chip non-shift mask set design that AFFX needs to create to
implement the Development Plan for such Product. RMS will pay such fees [**] on
receipt of AFFX's invoice for each mask design, which AFFX shall issue when AFFX
receives the complete target sequence for each such mask set design.

     (b)  MANUFACTURING FACILITY FEES.  Upon adoption of each Development Plan,
RMS shall pay AFFX the Manufacturing Facility Fee specified in such Development
Plan. AFFX shall make available to RMS the records specifically showing how each
Manufacturing Facility Fee is spent. If circumstances result in an underage or
an overage in connection with a Manufacturing Facility Fee, the Executive
Steering Committee shall resolve, in good faith, adjustment of the Manufacturing
Facility Fee and the impact on the corresponding Product and Development Plan
and on each party's respective Development Cost and Manufacturing Cost. The
parties acknowledge that AFFX, at its sole discretion, may apply the
Manufacturing Facility Fee to the fabrication or establishment of new
facilities, or to the renovation of, addition of new lines to, or 


                                       7

<PAGE>

other modification or extension of existing facilities. The Manufacturing 
Facility Fee shall be recovered only pursuant to subsection (d) below.

     (c)  CHIP SALES. In connection with the supply arrangement under Article VI
below, for each Chip (as the partial purchase price for such Chip) RMS shall pay
AFFX the Chip Cost, [**] after receipt of AFFX's invoice therefor, which will be
issued on or after shipping of such Chips.

     (d)  PRODUCT SALES. For each Product sold or distributed by RMS, RMS shall
pay to AFFX [**] the Joint Business Revenue (as the balance of the purchase
price for the Chips), and retain [**] of the Joint Business Revenue. For each
Product sold or distributed by RMS where there are Gross Profits, RMS shall, 
[**].

     (e)  PAYMENT TERMS. All payments to AFFX under this Agreement are 
non-refundable and non-creditable (where "non-creditable" means only that 
payments made to AFFX are not intended as advances against future payments, 
and shall not otherwise affect the recovery of RMS Development Costs and 
Manufacturing Facility Fees as described herein). All such payments are to be 
made in US dollars in the United States. All conversions from foreign 
currency to US dollars will be determined on the last business day of each 
calendar quarter in the calendar quarter in which the payment, revenue, 
expenditure, or other transaction involving non-US currency occurred, based 
on the exchange rate of Wall Street Journal on the last day of that quarter. 
In no event will AFFX be required: (i) to make up any portion of any Deficit, 
(ii) to make any refund of any amounts paid to AFFX, or (iii) to apply any 
Deficit or anticipated Deficit to reduce or eliminate any payment hereunder. 
Late payments shall bear interest at the lower of: (i) the Bank of America 
[**] or (ii) the maximum rate allowed by law. All prices and payments to AFFX 
are exclusive of taxes, duties, shipping, withholdings and the like, all of 
which will be borne by RMS (except taxes or withholdings based on AFFX's 
income, but only if such taxes and withholdings are fully creditable against 
US income taxes, RMS supplies any and all necessary or requested certificates 
and documentation, and RMS gives AFFX notice of the


                                       8

<PAGE>

requirement for such taxes and withholdings and allows AFFX the opportunity 
to protest their assessment and collection.

     (f)  RECORDS AND AUDIT RIGHTS. RMS shall keep complete and accurate records
reflecting all information necessary or useful in verifying the accuracy of each
payment report. AFFX shall also keep complete and accurate records reflecting
all information necessary or useful in verifying the accuracy of its
manufacturing and development costs relevant to determination of payments to be
made by RMS to AFFX hereunder. Each party shall have the right to hire an
independent certified public accountant to inspect all such records so required
to be kept by the other (which accountant shall be reasonably acceptable to the
other party and shall agree in writing to keep all information confidential
except as needed to disclose any discovered discrepancies); provided, such
audit: (i) is conducted during normal business hours, (ii) is conducted no more
often then once per [**] (unless a discrepancy greater than [**] is discovered
in favor of the auditing party), and (iii) is conducted only after the auditing
party has given thirty days prior written notice. The auditing party shall bear
the full cost and expense of such audit, unless a discrepancy in excess of [**]
of the underage in favor of the auditing party is discovered, in which event the
audited party shall bear the full cost and expense of such audit. Regardless of
the amount of discrepancy discovered, all discrepancies (and interest thereon)
shall be immediately due and payable.

IV.  PRODUCT DEVELOPMENT.

     (a)  PRODUCT SPECIFICATIONS. With respect to each Product, other than those
listed on Exhibit A, AFFX and RMS shall mutually and in good faith determine
written specifications ("Specifications") and a written development plan and
schedule ("Development Plan" and "Development Schedule") for such Product. Any
changes to the Specifications, Development Plan or Development Schedule for a
Product shall be subject to the mutual, good faith written approval of the
parties, which approval shall not be unreasonably withheld.

          For the Products listed on Exhibit A, draft Specifications,
Development Plans and Development Schedules are attached in Exhibit E. The
parties acknowledge that such drafts are incomplete as of the Effective Date.
The Executive Steering Committee shall complete the Specifications, Development
Plans and Development Schedules for the Products listed in Exhibit A within
sixty (60) days after the Effective Date.

     (b)  AFFX DEVELOPMENT OBLIGATIONS. For each Product AFFX will use
reasonable commercial efforts to perform the following activities: (i) undertake
and complete non-clinical development of the applicable Chip according to the
Specifications, including manufacturing scale-up, (ii) prepare and provide RMS
with non-clinical development information for each applicable Chip necessary for
PMA and similar filings and (iii) supply clinical trial units of


                                       9

<PAGE>

Chips; provided that RMS provides as soon as reasonably possible on a 
continuing basis forecasts of its clinical supply needs. In addition to 
payments under Section III, RMS will, promptly upon invoice, reimburse AFFX 
for Chip Costs in connection with the foregoing.

     (c)  RMS DEVELOPMENT OBLIGATIONS.

          (i)  RMS shall at its expense use reasonable commercial efforts to
          expeditiously obtain in the United States, and each country set forth
          in the Development Plan all applicable regulatory approvals for each
          Product and to perform the following activities with respect to each
          Product, at its own expense and in accordance with the Development
          Plan and Development Schedule: (A) undertake and complete non-clinical
          development of the Product according to the Specifications, including
          manufacturing scale-up and development of any readers, assay
          equipment, or other non-Chip equipment necessary for marketing of the
          Product (provided, however, that no part of the costs of such non-Chip
          development shall be made part of RMS or AFFX Development Costs or
          Deductible Expenses), (B) complete all preclinical work (other than
          that for which AFFX is obligated under subsection (b) above) for the
          Product, (C) conduct and manage all clinical trials, including
          statistical analysis and evaluation, and (D) prepare and file all
          applicable IDE and PMA and similar documents and obtain all necessary
          regulatory, reimbursement and pricing approvals in the United States,
          and each country in the Development Plan. RMS further agrees to use
          its reasonable efforts to file a PMA (or similar filing) for each
          Product set forth on Exhibit A in the United States and each country
          in the Development Plan within [**] from the date of the US IDE filing
          and to file PMA's in the United States and similar filings in the
          countries in the Development Plan for each other Product within [**]
          of the applicable US IDE filing. RMS's obligations hereunder shall
          include, without limitation, all testing and other activity necessary
          or useful to ensure compliance with applicable FDA and other Approval
          Entity rules and regulations. Within [**] after a Product becomes a
          Product, RMS will provide AFFX with a summary pre-clinical and
          clinical plan in reasonable detail (and reasonably acceptable to AFFX)
          for such Product for the United States and each country in the
          Development Plan and will provide a status report and update with
          respect thereto every [**].

          (ii) RMS shall be entitled to submit the filings in its name;
          provided, however, that notwithstanding anything else in this
          Agreement, AFFX shall have: (A) at all times full access to all
          filings and all information and data relevant to any Product or former
          Product and (B) the right to fully use and cross reference all such


                                      10

<PAGE>

          submissions, approvals, information and data and, if RMS ceases active
          marketing or distribution in a country with respect to a Product or if
          a Product ceases to be a Product, to have such submissions, approvals,
          information and data transferred to AFFX's name. RMS will assist AFFX
          in doing so and will provide AFFX with copies of all the foregoing
          promptly as they are created.

          (iii) In the event that AFFX believes that RMS is not using
          reasonable efforts to perform any of the foregoing responsibilities
          with respect to a Product and that such failure has or may cause a
          delay with respect to the Development Schedule or the aforementioned
          period for PMA (or similar) filing, AFFX will provide written notice
          of this to RMS. Upon such written notice, RMS will have ninety (90)
          days to explain to AFFX in writing the cause of the delay. If the
          delay is caused by RMS's failure to use reasonable efforts to perform
          any of the foregoing responsibilities, AFFX shall have the right to
          terminate this Agreement with respect to the particular Product if the
          time from IND filing to PMA (or similar) filings referred to above is
          or will be exceeded.

     (d)  MUTUAL SUPPORT. Each party may, upon mutual agreement of the parties,
support the other by performing on the other's behalf certain of the other's
obligations under subsections (b) or (c) as applicable. The supporting party
will be paid for any such support within [**] of any invoice amounts equal to
that party's Development Costs. The party being supported may request a good
faith non-binding estimate of such costs.

V.   LONG RANGE FORECASTS AND PERFORMANCE MEASURES.

     (a)  LONG RANGE FORECASTS. As part of each Development Plan, RMS shall
designate at least [**] of the countries listed in such Development Plan
including the United States as "Forecast Countries." If a Development Plan lists
fewer than [**] countries including the United States then all countries in such
Development Plan shall be Forecast Countries. At least [**] prior to anticipated
commencement by RMS of clinical trials in support of an anticipated regulatory
submission for a Product in a Forecast Country, RMS will supply AFFX, in a form
reasonably acceptable to AFFX, with a preliminary [**] forecast for such
Forecast Country. At least [**] prior to any anticipated regulatory submission
or a similar filing in a Forecast Country, RMS will supply AFFX with a [**]
forecast for each applicable Product in such Forecast Country. Upon the first
marketing approval in each Forecast Country, but in no case less than [**] prior
to the first significant marketing activity or other Product launch activity in
such Forecast Country, RMS will supply AFFX with a [**] forecast for each
applicable Product for such Forecast Country reasonably acceptable to AFFX (a
"Long Range Forecast"); upon any subsequent marketing approval in any such
Forecast Country, RMS will update the then applicable Long Range Forecast for
such Forecast Country in a manner reasonably acceptable to 


                                      11

<PAGE>

AFFX to reflect the new Product or indication. [**] before the end of the 
period covered by any Long Range Forecast (whether defined in this sentence 
or the preceding sentence), RMS will supply AFFX with a [**] forecast for 
each Product for such Forecast Country reasonably acceptable to AFFX (also a 
"Long Range Forecast"). Each [**] forecast will contain forecasts for each 
Product [**]. If the parties cannot agree on a Long Range Forecast (or update 
thereto) for a Forecast Country the matter shall be resolved by the Executive 
Steering Committee. All forecasts will be reasonable and made in good faith 
with the understanding that AFFX will rely on those forecasts for planning 
its production infrastructure. Each Long Range Forecast will be broken down 
by [**] Product in a form that is reasonably acceptable to AFFX.

     (b)  MARKETING EFFORTS. RMS will use diligent efforts to market and
distribute each Product in the United States and each country specified in the
Development Plan for that Product.

     (c)  PERFORMANCE MEASURES. If Net Sales of any Product in a particular
country in any applicable period are not [**] (i) AFFX shall have the right to
market, sell and otherwise distribute (or appoint third parties, including
without limitation other distributors, to conduct such activities) such Product
in such country, and (ii) AFFX may terminate this Agreement with respect to such
Product in such country.

          Neither RMS nor any of its Affiliates will develop, manufacture,
purchase, distribute or market (or have or enter into any agreement or
arrangement with respect to) any product based on or incorporating a genetic
analysis chip or probe array component competitive with a Product as long as
this Agreement remains in effect for such Product; provided, however, that RMS
may consult with AFFX (which consultations shall be in good faith) regarding
specific business proposals that may include such competing products if such
competing products and/or proposal would not materially detract from the sale of
Products hereunder.

          If this Agreement has been terminated [**] in the Development Plan for
a particular Product, the Executive Steering Committee shall determine the
commercial feasibility of continuing to market that Product in any countries.

VI.  SUPPLY AND MARKETING.

     (a)  AFFX SUPPLY OBLIGATIONS. Subject to the terms and conditions of this
Agreement, AFFX shall use reasonable commercial efforts to fill (by full or
partial shipment) RMS's orders for Chips, FOB AFFX's plant.

     (b)  QUANTITY; FORECASTS; ORDERS.


                                      12

<PAGE>

          (i)   With respect to each Product, and in addition to the Long Range
          Forecasts of Section V(a), RMS shall deliver to AFFX (i) at least [**]
          prior to the [**] in which the first commercial sale of such Product
          is projected to occur, a forecast of RMS's quantity requirements for
          each Chip to be incorporated into such Product, broken down by form
          (wafer or packaged), for the [**] in which the first commercial sale
          of such Product is projected to occur and (ii) at least [**] prior to
          the calendar quarter in which the first commercial sale of such
          Product is projected to occur, RMS's firm order and requested delivery
          dates ("Delivery Dates") for such Chips for such [**] (which shall be
          subject to agreement by AFFX, which agreement shall not be
          unreasonably withheld). Thereafter, RMS shall deliver to AFFX within
          [**] after the beginning of each calendar quarter, RMS's firm order
          and Delivery Dates for Chips for such Product for the next [**] and a
          forecast of its quantity requirements for such Chips for the
          subsequent [**]. If a required forecast or order for a [**] is not
          timely submitted for a Product, the immediately preceding forecast of
          Chips for that Product for that [**] shall become the new forecast or
          order; if there is no preceding forecast for a [**], the forecast or
          order for the immediately preceding [**] shall become the forecast or
          order.

          (ii)  For each forecast, the quantity of any Chip forecast for
          delivery in the first of the [**] forecast shall be not less than [**]
          or more than [**] of the most recent previous forecast for such [**].
          In addition, firm orders for a particular [**] shall not cover a
          quantity of Chips more than [**] larger or smaller than the quantity
          of such Chips ordered for the previous [**].

          (iii) The total quantity of each Chip ordered by RMS for delivery
          in any [**] may not be less than [**] of RMS's most recent required
          forecast for such Chip for such [**]. In addition, AFFX's supply
          obligation will not extend to more than [**] of RMS's most recent
          forecast for such Chip for such [**]. If a RMS Chip requirement for
          any [**] exceeds [**] of RMS's most recent forecast for such Chip for
          such [**], AFFX and RMS will discuss in good faith the additional
          amount, if any, that AFFX is willing to supply consistent with its
          other obligations and RMS will adjust its order accordingly. RMS shall
          indemnify AFFX and reimburse it promptly upon request for all
          reasonable out of pocket costs and expenses, (including the cost of
          carrying increased inventory if requested by RMS to do so) to the
          extent caused by any deviation in order quantities from the limits
          imposed by the preceding sentence, and AFFX will act reasonably to
          mitigate any such costs and expenses.


                                      13
<PAGE>

          (iv)  RMS shall also be able to order from AFFX the AFFX Readers and
          other non-Chip products set forth on Exhibit B, pursuant to AFFX'
          [**], and AFFX will use reasonable efforts to fill such orders,
          subject to acceptance of each order by AFFX at its sole discretion.
          During the term of this Agreement if [**] provided, however, that RMS
          adopts all of the additional restrictions, obligations and license
          limitations imposed in such agreement.

          (v)   RMS's forecasts and orders of Chips, AFFX Readers, and other
          non-Chip products shall separately identify items to be used as free
          samples, shall be made on a country-by-country basis, and shall
          reflect its good faith expectations of customer demand. RMS shall act
          in a commercially reasonable manner to schedule orders to avoid
          creating over or under capacity problems for AFFX. RMS may indicate on
          each order of Chips whether such Chips should be shipped as wafers
          (the default if the order does not otherwise clearly indicate) or cut
          into individual chips and packaged ready for use with AFFX Readers.
          For any orders of Chips packaged for AFFX Readers, RMS must also order
          the AFFX Readers that will be used, sold or distributed with such
          Chips from or through AFFX.

     (c)  RMS'S MARKETING OBLIGATIONS. RMS represents, warrants and covenants:

          [**.]

     (d)  CHIP CONFORMANCE. At the time of shipment all Chips shall conform
[**.]

     (e)  MANUFACTURING PROCESS CHANGES. Prior to implementing any material
change to its manufacturing processes for Chips, AFFX shall give notice to RMS
of sufficient details of the planned change to allow RMS to consider the impact
of such change on regulatory requirements for the Products associated with such
Chips. The Executive Steering Committee shall determine how such changes can be
made to minimize such regulatory impact, and AFFX shall endeavor to accommodate
input from the Executive Steering Committee and RMS to achieve the changes with
minimum regulatory impact.

     (f)  RMS SUPPLY OBLIGATIONS. AFFX may, at AFFX' discretion, order from RMS
any available RMS Readers for use in markets that are not directly competitive
with the markets for Products (as shown in the Development Plans for such
Products) according to terms and conditions, prices and discounts to be mutually
determined by the parties. During the term of this Agreement if RMS [**;]
provided, however, that AFFX adopts all of the additional restrictions,
obligations and license limitations imposed in such agreement.


                                       14
<PAGE>

     (g)  SECOND SOURCE RIGHT. If AFFX: (i) fails to fill at [**] of the
Delivery Dates for such firm orders, or (ii) fails to supply any Chips to RMS
for more than [**] where there are properly forecast firm orders for Chips
outstanding; then RMS may provide written notice that RMS wants AFFX to
establish a second source for Chips. If RMS exercises its right to have AFFX
establish a second source for Chips, then AFFX shall use diligent efforts to
establish such a second source reasonably acceptable to RMS, and will negotiate
a license for the necessary rights and technology with a suitable royalty with
such second source; provided that if such second source is not able to provide
any Chips to RMS within [**] after RMS makes the request for a second source,
then RMS may provide written notice to AFFX that RMS wishes to manufacture Chips
itself. If RMS exercises its right to manufacture, AFFX will grant RMS a
worldwide, non-exclusive, non-transferable license with right of sublicense
under its rights in Chips to make, have made, import, distribute, offer for
sale, and sell Chips, subject to negotiation and on-going payment of a
reasonable royalty to AFFX, and only for so long as AFFX remains unable to
supply Chips. Nothing in this section will relieve either party of its other
obligations under this Agreement.

VII. OWNERSHIP; DEVELOPMENT LICENSE; CONFIDENTIALITY.

     (a)  OWNERSHIP. Intellectual Property shall mean all inventions (whether or
not patentable), works of authorship, know-how, designs, and other developments
created during the course of this Agreement. The parties will jointly own the
rights in Intellectual Propertry created hereunder except that (i) Intellectual
Property relating to [**] and (ii) Intellectual Property relating to [**.] Any
assignments necessary to accomplish the foregoing are hereby made and each party
will execute such further documents as may be reasonably requested by the other
with respect thereto. Neither party will be obligated under this Agreement to
obtain [**.] Notwithstanding the foregoing: [**] shall not be subject to the
provisions of this Article VII.

     (b)  JOINTLY OWNED INTELLECTUAL PROPERTY. Jointly owned Intellectual
Property may be exploited by either party for uses by such party and its
Affiliates and wholly-owned subsidiaries [**.]  Jointly owned Intellectual
Property may be non-exclusively licensed to third parties by either party
worldwide provided that [**.] With respect to patent rights in jointly owned
Intellectual Property, the parties will mutually discuss whether to obtain,
maintain, enforce or defend such patent rights and if one refuses to take any
such joint action requested by the other, the other may proceed at its own
expense and the party refusing to take action will similarly assist such other
party; no such action will change the foregoing ownership provisions, but a
party that unilaterally enforces the joint patent rights (after refusal by the
other to do so jointly) will be entitled to retain all proceeds of such action.

     (c)  NON-JOINTLY OWNED INTELLECTUAL PROPERTY. Each party shall have the
right, but not the obligation, to file patent applications relating to any
Intellectual Property solely owned by


                                       15
<PAGE>

such party ("Owning Party"). If the Owning Party does not file a patent
application in such solely owned Intellectual Property ("Invention") within
[**] after requested to do so by the other party ("Non-owning Party"), then
the Owning Party shall advise the Non-owning Party of its decision not to
file such patent applications within [**] thereafter, and the Non-owning
Party shall have the right, but not the obligation, to file such patent
applications for such Inventions on behalf of the Owning Party; provided,
however, that such filing shall not result in any change in ownership in any
Invention. [**.] Each party hereby grants to the other party a non-exclusive,
worldwide, royalty-free license to make, have made, use, sell, offer to sell,
import, export, and otherwise fully exploit the Inventions assigned to such
party pursuant to subsection (a) above; provided, however, that such license
shall not be sublicensable and shall not extend to any underlying technology
or rights in such Invention.

     (d)  DEVELOPMENT LICENSE. Subject to the terms and conditions of this
Agreement and terminating upon the termination of this Agreement for any reason,
each party hereby agrees not to assert any patents, copyrights, trade secret
rights, and other proprietary or intellectual property rights owned or
controlled by such party against the other party provided that the other party's
use of such rights is solely in fulfilling its obligations hereunder.

     (e)  CONFIDENTIALITY. Each party may give the other party (hereinafter
respectively "Disclosing Party" and "Receiving Party") access to its
"Proprietary Information", as herein defined. "Proprietary Information" shall
mean any and all information, data, know-how, whether written, oral or computer
readable, technical or non-technical, including financial information obtained
from the other party, as well as tangible materials, including without
limitation samples, chemicals, software, models, drawings or diagrams,
including, without limitation, all Intellectual Property. Proprietary
Information shall not include any information which a party has expressly
authorized for publication. Disclosing Party and Receiving Party, on behalf of
itself and its employees, agree that any Proprietary Information disclosed by
Disclosing Party will be disclosed on the following terms:

          (i)   Proprietary Information disclosed by Disclosing Party to
          Receiving Party hereunder will be received and held in strict
          confidence for a period of five (5) years from the date of disclosure
          of such Proprietary Information to the Receiving Party.

          (ii)  Receiving Party will take all reasonable steps as are necessary
          to prevent the unauthorized disclosure of Proprietary Information to
          third parties.

          (iii) Receiving Party will not utilize Proprietary Information except
          for the express purposes of:  (A) performing this Agreement;
          (B) for use in obtaining approval by the FDA and any Approval
          Entities; or (C) as otherwise expressly


                                       16
<PAGE>

          permitted in this Agreement, unless it obtains Disclosing Party's
          prior written consent to such utilization.

          (iv)  Receiving Party may disclose Proprietary Information to its
          agents, consultants, collaborators and clinical investigators only to
          the extent necessary to fulfill the obligations of this Agreement,
          file and prosecute applications, respond to governmental and
          regulatory inquiries, or as otherwise expressly provided in this
          Agreement, provided such party(s) agrees to be bound by the terms of
          this Section VII(e).

     (f)  EXCEPTIONS. The commitments set forth in subsection (e)(i) - (iv)
above shall not extend to any information disclosed by one party to the other if
one or more of the following conditions should exist:

          (i)   information which is now or becomes a part of the public domain
          without the fault of Receiving Party;

          (ii)  information which Receiving Party can reasonably demonstrate
          through written documentation was already known to Receiving Party at
          the time of disclosure;

          (iii) information which is subsequently disclosed to Receiving Party
          by a third party having no obligation of confidentiality to Disclosing
          Party or its representatives;

          (iv)  information which is independently developed by or for Receiving
          Party and Receiving Party can prove this by documentary evidence; or

          (v)   information which is required by law, regulation, rule, act or
          order of any governmental authority to be disclosed. Receiving Party
          shall give Disclosing Party timely, prior notification if it intends
          to disclose any Proprietary Information pursuant to the terms of the
          preceding sentence in order that Disclosing Party shall have an
          opportunity to intervene to limit or prevent disclosure of such
          Proprietary Information; Receiving Party shall disclose only the
          minimum Proprietary Information required to be disclosed in order to
          comply with its disclosure obligations.

          Notwithstanding the foregoing, anything assigned to a party in
connection with this Agreement shall be deemed Proprietary Information of such
party disclosed by such party to the other and exceptions (ii) and (iv) above
will not be applicable thereto.


                                       17
<PAGE>

VIII.     MANAGEMENT OF RELATIONSHIP; DISPUTES.

     (a)  PROJECT COORDINATORS. Each party will have a "Project Coordinator."
The Project Coordinators will be responsible for day-to-day communications
between the parties.

          (i)   Either party may change its Project Coordinator at any time and
          from time to time by giving the other party written notice.

          (ii)  The Project Coordinators will meet every month to discuss the
          progress of the development and marketing efforts and, if applicable,
          to exchange information.

          (iii) Project Coordinators are not authorized to amend, alter or
          extend this Agreement in any manner.

          (iv)  If the Project Coordinators disagree on any issue, and cannot
          resolve it within two (2) weeks, either Project Coordinator may submit
          the problem to the Executive Steering Committee.

          (v)   An Executive Steering Committee will consist of three (3) people
          from each party and shall meet at least quarterly to:

                (1)  Twice per year adopt or readopt an operating budget and a
                Marketing Plan. Within the parameters of this Agreement, the
                budget and Marketing Plan will describe the major financial and
                non-financial responsibilities of the parties (e.g.,
                manufacturing, sales, marketing, development, etc. and major
                objectives and Gross Profits.)

                (2)  Quarterly review performance versus budget.

                (3)  Take actions to ensure Gross Profit objectives are met,
                including Gross Profit optimization.

                (4)  Consider possible new products that might be suitable for
                collaboration between the parties, and

                (5)  Timely adopt Long Range Forecasts.

          (vi)  Each party: (A) may change its members of the Executive Steering
          Committee at any time and (B) will cause its members of the Executive
          Steering Committee to act reasonably, in good faith and consistent
          with both the terms and


                                       18

<PAGE>

          spirit of this Agreement. The Executive Steering Committee may 
          take action only by the unanimous written consent of all members 
          identified above. If an issue remains unresolved after 
          consideration by the Executive Steering Committee, any Executive 
          Steering Committee member may escalate it to the Chief Executive 
          Officers of the parties for resolution.

     (b)  DISPUTE ESCALATION. With the exception of interim equitable relief,
neither party will institute legal proceedings regarding a bona fide dispute
until it has exercised reasonable good faith efforts to achieve resolution
through the foregoing procedure.

IX.  TERM AND TERMINATION.

     (a)  TERM. Unless terminated earlier as provided herein, this Agreement
shall commence on the Effective Date and with respect to each Product this
Agreement shall have an initial term of ten (10) years starting on the date of
adoption of the Development Plan for such Product, and the Agreement as a whole
shall terminate after termination with respect to all Products.

     (b)  TERMINATION. This Agreement may be terminated in its entirety by a
party for cause immediately upon the occurrence of any of the following events:

          (i)  If the other ceases to do business, or otherwise terminates its
          business operations;

          (ii) If the other shall fail to promptly secure or renew any license,
          registration, permit, authorization or approval essential to the
          conduct of its business in the manner contemplated by this Agreement
          in any significant country, or if any such license, registration,
          permit, authorization or approval is revoked or suspended and not
          reinstated within sixty (60) days or diligent efforts are not being
          made to effect such reinstatement; provided, however, that such
          termination shall only extend to the countries and Products affected
          by the failure of such party to maintain such license, registration,
          permit, authorization or approval;

          (iii)     If the other materially breaches any material provision of
          this Agreement and fails to cure such breach within sixty (60) days of
          written notice describing the breach and the intent of such party to
          terminate if such breach is not cured within such period (provided,
          however, that nothing in this subsection shall prevent a party from
          seeking immediate, injunctive relief where appropriate to protect
          Proprietary Information or such party's proprietary or intellectual
          property rights); or

                                      19

<PAGE>

          (iv) If the other shall seek protection under any bankruptcy,
          receivership, trust deed, creditors arrangement, composition or
          comparable proceeding, or if any such proceeding is instituted against
          the other (and not dismissed within 120 days); or

          (v)  With respect to a particular Product, if RMS fails to order the
          minimum quantities of such Product specified in the Development Plan
          therefor, then, upon thirty (30) days of written notice to RMS
          describing the breach and AFFX's intent to terminate if such breach is
          not cured within thirty (30) days, AFFX may terminate this Agreement
          but only with respect to such Product.

     (c)  EFFECT OF TERMINATION. Sections IV(c)(ii), VI(c), Articles II, III
(except III(a)), VII, IX, X, XI, XII, and XIII, all rights to payment, and
remedies for breaches shall survive termination of this Agreement. Obligations
of the parties under firm orders for purchase and delivery of Chips at the time
of such termination shall remain in effect, except that in the case of
termination under Section IX(b) the terminating party may elect whether
obligations under firm orders will remain in effect; provided, however, that
AFFX will not be obligated with respect to any Delivery Dates (for firm orders
or otherwise) more than [**] after termination if the reason for termination is
not due to a breach by AFFX, or more than [**] after termination if the reason
for termination is due to a breach by AFFX. Each party will promptly return all
Proprietary Information of the other (and all copies and abstracts thereof) that
it is not entitled to use under the surviving terms of this Agreement, provided
that the parties shall not be required to return archival or backup copies of
such Proprietary Information as long as efforts are taken to erase such copies
where practicable, and such copies remain subject to the confidentiality
obligations of this Agreement. Termination of this Agreement with respect to a
particular Product in a particular country shall have the same effect as
termination of this entire Agreement, but with respect to the applicable Product
(including Chips) and country only. Termination is not the sole remedy under
this Agreement and, whether or not termination is effected, all other remedies
will remain available.

X.     WARRANTY AND WARRANTY DISCLAIMERS.

[**.]  EXCEPT FOR THE FOREGOING WARRANTIES, AND, IN CONNECTION WITH CHIPS, THE
WARRANTY OFFERED TO END USERS IN AFFX'S THEN-CURRENT END USER CHIP SALES
AGREEMENT AFFX DOES NOT WARRANT THE MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE OF THE CHIPS OR PRODUCTS OR PERFORMANCE OR NONINFRINGEMENT, DOES NOT
MAKE ANY WARRANTY, EXPRESS OR IMPLIED, WITH RESPECT TO CHIPS OR PRODUCTS,
SPECIFICATIONS, SUPPORT, SERVICE OR ANYTHING ELSE AND DOES NOT MAKE ANY WARRANTY
TO RMS'S CUSTOMERS OR AGENTS. AFFX HAS NOT 

                                      20

<PAGE>

AUTHORIZED ANYONE TO MAKE ANY REPRESENTATION OR WARRANTY OTHER THAN AS 
PROVIDED ABOVE.

XI.  LIMITED LIABILITY.

EXCEPT IN CONNECTION WITH ARTICLE VII OF THIS AGREEMENT, [**.] THIS ARTICLE DOES
NOT LIMIT LIABILITY FOR BODILY INJURY OF A PERSON.

XII. INDEMNITY.

     (a)  INDEMNIFICATION OF RMS FROM INFRINGEMENT. AFFX shall indemnify, defend
and hold harmless RMS and its officers, directors, employees, agents and
representatives and RMS's Affiliates, their officers, directors, employees,
agents and representatives ("RMS Indemnitees") [**] excluded from AFFX's
indemnity obligation by the immediately preceding sentence.

          Where [**.]

                                      21

<PAGE>

     (b)  INDEMNITY RELATING TO PRODUCTS.

          (i)  INDEMNIFICATION BY RMS   RMS shall indemnify, defend and hold
          harmless AFFX and its officers, directors, employees, agents and
          representatives  and AFFX' Affiliates, their officers, directors,
          employees, agents and representatives ("AFFX Indemnitees") from and
          against any and all liabilities, claims, demands, actions, suits,
          losses, damages, costs and expenses (including reasonable attorneys'
          fees) paid to third parties (collectively, "Damages") [**.]

          (ii) INDEMNIFICATION BY AFFX  AFFX shall indemnify, defend and hold
          harmless RMS and its officers, directors, employees, agents and
          representatives  and RMS Affiliates, their officers, directors,
          employees, agents and representatives ("RMS Indemnitees") from and
          against any and all liabilities, claims, demands, actions, suits,
          losses, damages, costs and expenses (including reasonable attorneys'
          fees) paid to third parties (collectively, "Damages") [**.]


(c)  CONDITIONS OF INDEMNIFICATION If either party proposes to seek
indemnification from the other under the provisions of this Article XII, it
shall notify the other party within fifteen (15) days of receipt of notice of
any such claim or suit and shall cooperate fully with the other party in the
defense of such claims or suits.  No settlement or compromise shall be binding
on a party hereto without its prior written consent.


XIII.     GENERAL.

     (a)  AMENDMENT AND WAIVER -- Except as otherwise expressly provided herein,
any provision of this Agreement may be amended and the observance of any
provision of this Agreement may be waived (either generally or in any particular
instance and either retroactively or prospectively) only with the written
consent of the parties. However, it is the intention of the parties that this
Agreement be controlling over additional or different terms of any purchase
order, confirmation, invoice or similar document, even if accepted in writing by
both parties, and that waivers and amendments shall be effective only if made by
non-pre-printed agreements clearly understood by both parties to be an amendment
or waiver. The failure of either party to enforce its rights under this
Agreement at any time for any period shall not be construed as a waiver of such
rights.

     (b)  GOVERNING LAW AND LEGAL ACTIONS -- This Agreement shall be governed by
and construed under the laws of the State of California and the United States
without regard to conflicts of laws provisions thereof and without regard to the
United Nations Convention on 

                                      22

<PAGE>

Contracts for the International Sale of Goods. In any action or proceeding to 
enforce rights under this Agreement, the prevailing party shall be entitled 
to recover costs and attorneys' fees.

     (c)  HEADINGS -- Headings and captions are for convenience only and are not
to be used in the interpretation of this Agreement.

     (d)  NOTICES -- Notices under this Agreement shall be sufficient only if
personally delivered, delivered by a major commercial rapid delivery courier
service or mailed by certified or registered mail, return receipt requested to
the parties to the addresses first set forth above or as amended by notice
pursuant to this subsection. If not received sooner, notice by mail shall be
deemed received 5 days after deposit in the US mails.

     (e)  ENTIRE AGREEMENT -- This Agreement supersedes all proposals, oral or
written, all negotiations, conversations, or discussions between or among
parties relating to the subject matter of this Agreement and all past dealing or
industry custom.

     (f)  SEVERABILITY -- If any provision of this Agreement is held to be
illegal or unenforceable, that provision shall be limited or eliminated to the
minimum extent necessary so that this Agreement shall otherwise remain in full
force and effect and enforceable.

     (g)  RELATIONSHIP OF PARTIES -- The parties hereto expressly understand and
agree that the other is an independent contractor in the performance of each and
every part of this Agreement. Each party (the "Indemnifying Party") is solely
responsible for all of its employees and its labor costs and expenses arising in
connection with this Agreement and is responsible for and will indemnify the
other party from any and all claims, liabilities, damages, debts, settlements,
costs, attorneys' fees, expenses, and liabilities arising out of conduct or
omissions of the Indemnifying Party's employees relating to personal injury or
workman's compensation.

     (h)  ASSIGNMENT -- This Agreement and the rights hereunder are not
transferable or assignable without the prior written consent of the parties
hereto, and any such attempted assignment or transfer shall be void and without
effect, except for rights to payment and except to a person or entity who
acquires all or substantially all of the assets or business of a party, whether
by sale, merger or otherwise.

     (i)  PUBLICITY AND PRESS RELEASES -- Except to the extent necessary under
applicable laws the parties agree that no press releases or other publicity
relating to the substance of the matters contained herein will be made without
joint approval. A press release announcing this Agreement will be jointly
developed and released by the parties.

                                      23

<PAGE>

     (j)  FORCE MAJEURE -- No liability or loss of rights hereunder shall result
to either party from delay or failure in performance (other than payment) caused
by force majeure, that is, circumstances beyond the reasonable control of the
party affected thereby, including, without limitation, acts of God, fire, flood,
war, government action, compliance with laws or regulations (including, without
limitation, those related to infringement), strikes, lockouts or other serious
labor disputes, or shortage of or inability to obtain material or equipment.

     (k)  REMEDIES -- Except as otherwise expressly stated in this Agreement,
the rights and remedies of a party set forth herein with respect to failure of
the other to comply with the terms of this Agreement (including, without
limitation, rights of full termination of this Agreement) are not exclusive, the
exercise thereof shall not constitute an election of remedies and the aggrieved
party shall in all events be entitled to seek whatever additional remedies may
be available in law or in equity.

     (l)  BASIS OF BARGAIN -- EACH PARTY RECOGNIZES AND AGREES THAT THE WARRANTY
DISCLAIMERS AND LIABILITY AND REMEDY LIMITATIONS IN THIS AGREEMENT ARE MATERIAL
BARGAINED FOR BASES OF THIS AGREEMENT AND THAT THEY HAVE BEEN TAKEN INTO ACCOUNT
AND REFLECTED IN DETERMINING THE CONSIDERATION TO BE GIVEN BY EACH PARTY UNDER
THIS AGREEMENT AND IN THE DECISION BY EACH PARTY TO ENTER INTO THIS AGREEMENT.

AFFX                                   RMS


By            /s/                      By             /s/
      -------------------------              -------------------------

Name  STEPHEN P.A. FODOR, Ph.D.        Name  ROBERT TOWEY
      -------------------------              -------------------------

Title President and CEO                Title  Vice President
      -------------------------              -------------------------

                                      24

<PAGE>

                                  EXHIBIT A

                               INITIAL PRODUCTS

- -    HIV drug resistance profiling

- -    p53 mutation detection

                                      25

<PAGE>

                                  EXHIBIT B

                              NON-CHIP PRODUCTS

- -    HP Readers

- -    AFFX Fluidics Station

- -    AFFX GeneChip Operating System Software

                                      26

<PAGE>

                                  EXHIBIT C

                       BASE TECHNICAL SPECIFICATIONS

[**]

                                      27

<PAGE>

                                  EXHIBIT D

                             THIRD PARTY PATENTS

[**]


                                      28

<PAGE>

                                  EXHIBIT E

     [**]

                                      29


<PAGE>


                                                     AFFYMETRIX.FINAL DA.4.20.98

                  ENZO DIAGNOSTICS, INC. - AFFYMETRIX, INC.
                          DISTRIBUTORSHIP AGREEMENT

THIS AGREEMENT, effective upon acceptance by both parties below, is by and
between ENZO DIAGNOSTICS, INC. ("ENZO"), a New York corporation having its
principal place of business at 60 Executive Boulevard, Farmingdale, New York
11735-4716, and AFFYMETRIX, INC. and its affiliates ("AFFYMETRIX"), a California
corporation having its principal place of business at 3380 Central Expressway,
Santa Clara, California 95051.

WHEREAS, ENZO holds rights to certain patents listed in EXHIBIT A ("PATENTS"),
and it warrants that it can grant the distributorship rights under this
AGREEMENT;

WHEREAS, ENZO manufactures and/or sells certain products listed in EXHIBIT B
("PRODUCTS") and/or certain components of the PRODUCTS ("LABELING AND DETECTION
COMPONENTS") defined below, the manufacture, sale or use of which is covered by
claims of one or more PATENTS (EXHIBIT A);

WHEREAS, ENZO owns or holds the rights to patent applications, proprietary
technology and know-how, trade secrets, and other technical and/or confidential
information, that was developed by ENZO or developed on its behalf; and

WHEREAS, AFFYMETRIX wishes to market and distribute directly or through its
designated affiliates and distributors, and to use said PRODUCTS as provided
hereunder in connection with arrays including GeneChip-Registered Trademark-
products and GeneChip-Registered Trademark- assays;

NOW, THEREFORE, in consideration of the good and valuable mutual agreements
hereinafter set forth, the parties hereto agree to the provisions below.


DEFINITIONS:

AFFYMETRIX AFFILIATE shall mean any corporation, company, partnership, joint
venture and/or firm which is controlled by AFFYMETRIX.  For purposes of this
Section, "control" shall mean, in the case of corporations (or foreign
equivalents of corporations), direct ownership of 50% or more of the stock
having the right to vote for directors of such corporation or, in the case of
partnerships, 50% or more of the ownership interest in such partnership.
AFFYMETRIX Affiliates covered by this AGREEMENT, if any, will be listed in
EXHIBIT C.  Other AFFYMETRIX Affiliates may be added to EXHIBIT C upon written
notice from AFFYMETRIX to ENZO, for the latter's written acceptance, which will
not be unreasonably withheld.

- ------------------------
THE SYMBOL "**" IS USED THROUGHOUT THIS EXHIBIT TO INDICATE THAT A
PORTION OF THE EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE COMMISSION.

<PAGE>

AFFYMETRIX DISTRIBUTOR shall mean a bona fide distributor of Affymetrix probe
array products, which distributor is required to engage in substantive
marketing, distribution, and/or market development activities on behalf of
AFFYMETRIX.  AFFYMETRIX Distributors covered by this AGREEMENT if any, will be
listed in EXHIBIT D.  Other AFFYMETRIX Distributors may be added to EXHIBIT D
upon written notice from AFFYMETRIX to ENZO, for the latter's written
acceptance, which will not be unreasonably withheld.  For purposes of this
AGREEMENT and this definition, all manufacturer's representatives of AFFYMETRIX
are considered to be AFFYMETRIX Distributors, and are also listed in EXHIBIT D.

AFFYMETRIX means Affymetrix, Inc., including AFFYMETRIX Affiliates and
AFFYMETRIX Distributors.

ENZO means Enzo Diagnostics, Inc.

PRODUCT means an individual reagent, component or combination thereof including
kits for use in nucleic acid labeling and detection, the manufacture, use or
sale of which is covered by one or more claims of ENZO PATENTS (EXHIBIT A), the
PRODUCTS being listed in EXHIBIT B.

LABELING AND DETECTION COMPONENT means a PRODUCT which comprises a labeling and
detection system manufactured by ENZO for labeling and detecting nucleic acids,
such labeling and detection methods being also covered by one or more claims of
ENZO's PATENTS.

QUALIFICATION means the demonstrated performance of a PRODUCT in an assay for
which such PRODUCT is intended as set forth in a PRODUCT specification.


1.   DISTRIBUTOR APPOINTMENT

During the term of this AGREEMENT, ENZO hereby appoints AFFYMETRIX to act as its
nonexclusive worldwide distributor for the distribution and sale of only the
PRODUCTS listed in EXHIBIT B, and AFFYMETRIX accepts such appointment and agrees
to act as such distributor under the terms and conditions set forth herein.
During the term of this AGREEMENT, ENZO agrees to manufacture and/or supply the
PRODUCTS to AFFYMETRIX under the terms set forth herein.


                                       2
<PAGE>

AFFYMETRIX hereby agrees:

a.   not to purchase any PRODUCTS from other suppliers or manufacturers;

b.   not to manufacture PRODUCTS except as otherwise stated in this AGREEMENT;

c.   to rely on ENZO as its sole source of PRODUCTS, including PRODUCTS for the
arrays including the GeneChip-Registered Trademark- arrays and
GeneChip-Registered Trademark- assays;

d.   not to use any PRODUCT(s) to manufacture other PRODUCTS or other products,
except for quality control purposes or for developing new gene chip products
under specific authorization from ENZO as provided in Section 5 below;

e.   that all PRODUCTS distributed by AFFYMETRIX are for distribution in the
research market for research use only; and that it is expressly understood that
the PRODUCTS are not intended for nor will they be used for diagnostic purposes
or as therapeutic agents; and

f.   that except for distribution under the terms and conditions of this
AGREEMENT and authorized use as provided in Section 5 below, purchase of
PRODUCTS does not include any right or license to exploit the PRODUCTS
commercially, including any right or license to sell the PRODUCTS to other
distributors (except as listed in EXHIBIT D), and that any other commercial use
or development of these PRODUCTS or development using these PRODUCTS without the
express prior written authorization of ENZO is strictly prohibited.

ENZO hereby agrees:

a.   to use reasonable efforts in QUALIFICATION of the PRODUCTS as set forth in
the PRODUCT specifications;

b.   to manufacture and/or supply the PRODUCTS (EXHIBIT B) in accordance with
commercially reasonable practices and as set forth in Sections 5, 8, and 9; and

c.   to manufacture and/or supply such PRODUCTS to meet the relevant
specifications accepted by both ENZO and AFFYMETRIX.


                                       3
<PAGE>

2.   RELATIONSHIP BETWEEN ENZO AND AFFYMETRIX

Nothing herein creates or constitutes a partnership, joint venture, or an
agreement of agency between the parties with respect to any activities
whatsoever.  The relationship between ENZO and AFFYMETRIX shall be that of
seller and buyer, and neither party shall conclude any contract or agreement or
make any commitment, representation or warranty which binds or purports to bind
the other party or otherwise act in the name of or on behalf of the other party.

ENZO and AFFYMETRIX agree that the distribution relationship between them does
not constitute, nor does it imply, a license of any of ENZO's technology or
patents, nor does it abrogate any of ENZO's rights under its patents.  ENZO
maintains full rights under its PATENTS.  The foregoing statements are paramount
to this AGREEMENT.


3.   ASSIGNMENT

This AGREEMENT may not be assigned or otherwise transferred by AFFYMETRIX
without the prior written consent of ENZO, except in the case of a
reorganization or reincorporation of AFFYMETRIX, in which case this AGREEMENT
may be assigned.  Any attempted assignment or transfer without such consent
shall be void AB INITIO.  In the case of an outright bona fide purchase by a
third party of all of AFFYMETRIX's relevant significant probe array assets, ENZO
will not unreasonably withhold its consent to the assignment or transfer of this
AGREEMENT by AFFYMETRIX to such third party.  Any such third party will be
subject to all of the provisions and obligations of this AGREEMENT.  In the
event that ENZO consents to the assignment or transfer of this AGREEMENT, then
the provisions of Section 16 below with respect to termination will be shortened
from six (6) months to four (4) months.

Notwithstanding any of the provisions of the preceding paragraph, the authorized
use rights from ENZO to AFFYMETRIX described in further detail in Section 5
below cannot be assigned or otherwise transferred by AFFYMETRIX under any
circumstances, unless prior written approval from ENZO is first obtained.


4.   PAST SALES AND ACTIVITIES

AFFYMETRIX and ENZO agree that as between [**.]


                                       4
<PAGE>

5.   PRODUCTS AND PRICE AND PAYMENT

PRODUCTS covered by this AGREEMENT are listed in EXHIBIT B. The price to
AFFYMETRIX will be [**.]  For new or modified PRODUCTS not listed in EXHIBIT B,
the transfer price to AFFYMETRIX for each PRODUCT will be [**.]  ENZO has the
right to adjust prices to AFFYMETRIX after providing AFFYMETRIX with [**]
written notice.  Any price adjustment will affect future purchases, but will not
affect those already under existing firm purchase order commitment.  ENZO will
not [**] as described further below in this section.

Notwithstanding the provisions of Section 8 below, ENZO, may, at its sole
discretion and upon written notice to AFFYMETRIX, designate another party as an
interim manufacturer to manufacture certain PRODUCTS or certain components of
PRODUCTS for ENZO.  Upon written notice to AFFYMETRIX, ENZO may, at its sole
option, either resume manufacturing such PRODUCT(s) or such PRODUCT components
itself, or it may designate another alternate manufacturer.

New products may be added to this AGREEMENT and will be considered PRODUCTS and
listed in EXHIBIT B upon the consent of ENZO and AFFYMETRIX.

ENZO agrees to permit AFFYMETRIX to use PRODUCTS and ENZO's confidential
information ("C.I.") as defined in Section 14 below only for the following
purposes and AFFYMETRIX agrees that its use of same shall be limited to:

     (a)  performing quality control procedures for the PRODUCTS;
     (b)  optimizing the function of GeneChip-Registered Trademark- products and
          GeneChip-Registered Trademark- Assays; and
     (c)  developing new gene chip products.

If any invention or product is conceived during the course of AFFYMETRIX' use of
the PRODUCTS and/or ENZO's C.I. and is directed to the PRODUCTS, or their use,
or improvements thereto, [**,] and [**.]

AFFYMETRIX agrees to reimburse ENZO for its costs and reasonable overhead
incurred in the development of any new PRODUCTS or products as reasonably
requested by AFFYMETRIX and approved in writing by both parties.


                                       5

<PAGE>


6.   TERMS OF PAYMENT AND AUDIT

Payment shall be net thirty (30) days from delivery of PRODUCT.

     At the end of each calendar year, AFFYMETRIX will additionally pay ENZO 
an amount equal to [**] for PRODUCTS sold hereunder to account for the 
distribution, sales and services provided by use of the GeneChip-Registered 
Trademark- arrays or array sets in those instances where PRODUCTS were 
purchased from ENZO in quantities less than would be used in conjunction with 
the GeneChip-Registered Trademark- arrays or array sets associated with a 
PRODUCT during such calendar year.  If [**], then AFFYMETRIX will 
additionally pay ENZO an amount equal to [**] for such PRODUCTS.  AFFYMETRIX 
can adjust this annual payment if [**.]  Any such payments shall be 
contingent upon ENZO meeting the time, quantity, and quality requirements of 
AFFYMETRIX for the PRODUCTS, provided that any adjustments shall be only to 
the extent of any deficiencies in supply by ENZO.

     AFFYMETRIX agrees to permit its books and records related to the product 
sales to be examined by ENZO on reasonable prior written notice to verify 
receipts. Examination will take place on reasonable prior written notice, as 
necessary, but not more often than once per year.

7.   PRODUCT SHIPMENTS

     All PRODUCTS shipped by ENZO to AFFYMETRIX will be shipped F. 0. B. 
Farmingdale, NY.

8.   FORECASTS AND PURCHASE ORDERS

     AFFYMETRIX will issue a forecast schedule during the [**] covering its 
estimated requirements for PRODUCTS for the succeeding [**].  Such forecast 
will be considered for planning purposes only and not a purchase commitment.  
Within ten (10) business days after the effective date of this AGREEMENT, 
AFFYMETRIX will issue to ENZO its first forecast schedule, it being 
understood by the parties that the first forecast for PRODUCTS will be based 
upon an [**.]

     A purchase order will be issued by AFFYMETRIX at least [**] in advance 
of the requested delivery of PRODUCT.  This purchase order will indicate 
specific delivery and/or shipping requirements.  Orders placed with ENZO may 
not be canceled by 


                                       6

<PAGE>

AFFYMETRIX more than [**] after issuance of the order.  ENZO will meet such 
delivery and/or shipping requirements unless it advises AFFYMETRIX within [**]
of the date of such purchase order that it is unable to supply PRODUCT as 
ordered by AFFYMETRIX, whereupon the parties agree to discuss a revised 
schedule for delivery of PRODUCT to AFFYMETRIX.  After ENZO and AFFYMETRIX 
agree to the provisions of a revised schedule, ENZO will make reasonable 
efforts to fulfill the provisions of the revised schedule; in no instance, 
however, will PRODUCT(s) be shipped [**] after issuance of the purchase order 
by AFFYMETRIX, unless agreed to by both parties.  If ENZO is unable to meet 
the revised schedule, ENZO may designate interim or temporary manufacturers 
to manufacture PRODUCTS for ENZO, until such time as ENZO is ready to 
recommence supply by itself to AFFYMETRIX.

     Each purchase order shall be governed by the relevant provisions of this 
AGREEMENT (unless otherwise expressly provided in the individual purchase 
order and confirmed in writing by ENZO and AFFYMETRIX) and no term or 
condition which may appear in the printed matter in an AFFYMETRIX order form 
or any ENZO form that is contrary to the provisions of this AGREEMENT shall 
be binding on either party or apply to any transaction under this AGREEMENT.

9.   PRODUCT DELIVERIES AND SPECIFICATIONS

     Within a reasonable period of time not to exceed thirty (30) calendar 
days after the effective date of this AGREEMENT, ENZO and AFFYMETRIX will 
confer for the purpose of drafting and finalizing specifications, 
formulations, refining the PRODUCT list, such refinements including the use 
of existing ENZO PRODUCTS or ENZO PRODUCTS under development performing in an 
equivalent manner, and package inserts for those PRODUCTS in Exhibit B that 
AFFYMETRIX intends to distribute. The purpose of such conference will also 
include any other matters or details necessary or appropriate to carry out 
the provisions of this AGREEMENT.

     When an order is placed by AFFYMETRIX, ENZO shall ship the PRODUCT in 
accordance with Sections 7 and 8 above.  Failure by AFFYMETRIX to notify ENZO 
of rejection of the PRODUCT within [**] of receipt of PRODUCT will constitute 
acceptance. ENZO will supply, at the time of shipment of the PRODUCT to 
AFFYMETRIX, a statement that the PRODUCT conforms to the PRODUCT 
specifications.[**.]


                                       7

<PAGE>

     AFFYMETRIX shall immediately give written notice to ENZO of any notice, 
claim, demand, or communication from another for which AFFYMETRIX wishes to 
obtain indemnification from ENZO.  As part of the notice given to ENZO, 
AFFYMETRIX shall include copies of all correspondence and written materials 
relating to the notice.

     In its sole and absolute discretion, [**.]

[**.]


10.  SALES PROMOTIONS

     AFFYMETRIX shall exert on its own account its commercially reasonable 
efforts in sales promotions and advertisement of the PRODUCTS in association 
with the sale of others of its products.  Such efforts may include individual 
client contact, direct mailings, catalog listings and trade meeting 
promotions.  Upon request, ENZO will provide AFFYMETRIX with literature, 
technical data, specifications and the like describing any of ENZO's PRODUCTS 
for the purpose of assisting AFFYMETRIX in the preparation of advertisements, 
catalogs and other sales and promotional material for the PRODUCTS.  
AFFYMETRIX will list PRODUCTS in its next available or published product 
catalog(s) in which the PRODUCTS can be listed after the effective date of 
this AGREEMENT.  ENZO has the right to list the PRODUCTS in its product 
catalog and other advertisements and sales and promotional materials, it 
being understood that as a result of such activities of ENZO certain PRODUCTS 
may be purchased directly from ENZO or its distributors or licensees, and 
AFFYMETRIX shall be relieved from certain of its payments under Section 6 for 
any such sales.

11.  PRODUCT WARRANTY

     ENZO warrants that the PRODUCTS manufactured by ENZO for distribution by 
AFFYMETRIX will meet the specifications described in ENZO's PRODUCT or 
package inserts. [**.]  ENZO further warrants that all relevant quality 
control tests and quality assurance procedures will be performed for each 
batch of PRODUCTS so that each batch of PRODUCT conforms with the 
specifications, and that the PRODUCTS will be contained, packaged and labeled 
as specified by the product specifications for such PRODUCTS.


                                       8

<PAGE>

12.  STORAGE AND STOCK ROTATION

     ENZO agrees to share with AFFYMETRIX all necessary storage and stock 
rotation practices which apply to the PRODUCTS.

     AFFYMETRIX further agrees to take reasonable care not to ship PRODUCTS 
to its customers which have expired, been damaged in shipping and/or 
handling, or been improperly stored by AFFYMETRIX.  AFFYMETRIX will be 
responsible for damages arising from its shipment to its customers of 
PRODUCTS that have expired, been damaged in shipping and/or handling, or been 
improperly stored by AFFYMETRIX.

13.  PRODUCT LABELS AND PACKAGING

     AFFYMETRIX and ENZO agree to ship all PRODUCTS with a joint PRODUCT 
label and joint PRODUCT insert, both of which prominently include the names

                         ENZO DIAGNOSTICS, INC.
               and
                           AFFYMETRIX, INC.

with their respective company logos where appropriate.

     AFFYMETRIX agrees to package and to ship the PRODUCTS as part of or in 
association with applicable GeneChip-Registered Trademark- assays containing 
the package inserts to be finalized in accordance with Section 9 of this 
AGREEMENT and will use reasonable efforts to cause users of that assay to 
utilize the PRODUCTS.  In that product insert, AFFYMETRIX will recommend and 
instruct the end-user of that assay to use only the PRODUCTS contained 
therein.  AFFYMETRIX will also advise the end-user of that assay that any 
warranty for that assay will not be effective as a result of failure to use 
the PRODUCTS associated with such assays contained therein.

14.  CONFIDENTIALITY

     AFFYMETRIX and ENZO agree that they will not disclose any proprietary 
and confidential information (collectively "C.I.") made available to them by 
the other party.  Both parties further agree that all C.I. material will be 
in writing and marked confidential and that they will not make more copies 
than necessary of documents or materials 


                                       9

<PAGE>

which are provided under this AGREEMENT, nor will they distribute such 
documents or materials, or copies thereof, to any third party.  Furthermore, 
both parties agree to return any such documents or materials, or copies 
thereof, which are provided under this AGREEMENT if directed or requested to 
do so.

     The above obligations shall not apply to those portions of ENZO's and 
AFFYMETRIX's C.I. which (1) are or become generally publicly available 
through no act or failure to act by the recipient party, (2) were 
demonstrably known to the receiving party prior to disclosure under this 
AGREEMENT, or (3) are subsequently disclosed by a third party having a legal 
right to do so and not having a confidential relationship with respect 
thereto.

15.  FORCE MAJEURE

     No liability shall result to either party from delay in performance or 
from nonperformance under this AGREEMENT caused by circumstances beyond the 
control of the party who has delayed performance or not performed.  The 
nonperforming party shall be diligent in attempting to remove any such cause 
and shall promptly notify the other party of its extent and probable duration.

16.  DURATION AND TERMINATION

     This AGREEMENT shall become effective as of the date of the last signing 
party below, and it will continue for a period of three (3) years.  Unless 
terminated, it will continue thereafter for successive renewal terms of one 
(1) year each. Thereafter, or six (6) months prior to the end of the initial 
three year period in the case where termination at the end of the initial 
three year period is desired, either party may terminate this AGREEMENT 
without cause at any time by giving the other party notice in writing at 
least six (6) months in advance of the effective termination date stated in 
such written notice.  Notwithstanding the foregoing provisions of this 
paragraph, all other provisions in this AGREEMENT relating to termination, 
including Sections 3 (Assignment) and 17 (Indemnification) will remain in 
full force and effect.

     Upon termination of this AGREEMENT all distribution and use rights to 
AFFYMETRIX will be deemed immediately canceled and will revert in toto to 
ENZO.


                                      10


<PAGE>

17.  INDEMNIFICATION

     Except as set forth in and subject to the following paragraphs of this 
section, no party shall be liable for damages related to the PRODUCTS of this 
AGREEMENT arising from the fault or acts of commission or omission of the 
other party.

[**.]

Notwithstanding anything herein to the contrary, [**.]

     The obligations of AFFYMETRIX set forth in this section shall be binding 
on its successors, assigns, or trustees, and shall survive liquidation, 
insolvency, bankruptcy, sale, receivership, and general assignment of 
AFFYMETRIX and its successors in interest.  No assignment or delegation by 
AFFYMETRIX shall relieve it of its obligations under this section. [**.]

     The obligations of AFFYMETRIX set forth in this section shall survive 
the termination of this AGREEMENT for any reason, even if such termination is 
based on ENZO's breach of this AGREEMENT.  Any breach by AFFYMETRIX of its 
obligations set forth in this section shall be deemed material and shall 
entitle ENZO to terminate this AGREEMENT immediately and without affording 
AFFYMETRIX an opportunity to cure.

[**.]

     Any breach of this provision by AFFYMETRIX will be considered a material 
breach of this AGREEMENT, affording ENZO a right to terminate immediately 
without notice for cause.

18.  NOTICES

     All notices to be given with respect to this AGREEMENT shall be in writing 
and shall be deemed effectively given:
     when telecopied or faxed, receipt acknowledged; or
     when addressed as set forth below, or to such other address that either
     party designates by written notice to the other party by Federal Express or
     similar overnight courier:


                                      11

<PAGE>

     ENZO:
          Enzo Diagnostics, Inc.
          c/o Enzo Biochem, Inc.
          527 Madison Avenue, 9th Floor
          New York, NY 10022
          Attn:  Dr. Barbara E. Thalenfeld
          Vice President, Corporate Development
          Fax No.: (212) 583-0150.

     AFFYMETRIX:
          Affymetrix, Inc.
          3380 Central Expressway
          Santa Clara, CA 95051
          Attn: President
          Fax No.: (408) 481-0422.


19.  GOVERNING LAW

     This AGREEMENT is made under and shall be governed by the laws of the 
State of New York.

20.  WAIVER

     Waiver by ENZO or AFFYMETRIX of any provision of this AGREEMENT shall 
not be deemed a waiver of future compliance therewith and such provision as 
well as all other provisions hereunder shall remain in full force and effect.

21.  COMPLIANCE WITH LAWS

     Each party will comply with all United States laws, ordinances and 
regulations properly applicable to the manufacture, sale and distribution of 
the PRODUCTS described herein.  Where applicable, the parties will comply 
with the laws of the country in which the product is being sold.


                                      12

<PAGE>

22.  HEADINGS

     All headings of the clauses of this AGREEMENT are inserted for 
convenience only and shall not affect any construction or interpretation of 
this AGREEMENT.

23.  SEVERABILITY

     In the event that any clause of this AGREEMENT shall be found to be void 
or unenforceable, such finding shall not be construed to render any other 
clause of this AGREEMENT either void or unenforceable, and all other clauses 
shall remain in full force and effect unless the clause(s) which is/are 
invalid or unenforceable shall substantially affect the rights or obligations 
granted to or undertaken by either party.

24.  ENTIRETY

     This AGREEMENT together with the EXHIBITS attached hereto embodies the 
entire understanding between AFFYMETRIX and ENZO, and there are no contracts 
or prior drafts of the AGREEMENT, understandings, conditions, warranties or 
representations, oral or written, express or implied, with reference to the 
subject matter hereof which are not merged herein.  Except as otherwise 
specifically stated, no modification hereto shall be of any force or effect 
unless (1) reduced to writing and signed by both parties hereto, and (2) 
expressly referred to as being modifications of this AGREEMENT.

     IN WITNESS WHEREOF, the parties have caused this AGREEMENT to be 
executed by their duly authorized representatives on the dates indicated 
below.

ENZO DIAGNOSTICS, INC.                   AFFYMETRIX, INC.


By:         /s/                          By:          /s/
   ----------------------------------       ----------------------------------

Printed Name  DEAN LEE ENGELHARDT        Printed Name STEPHEN P.A. FODOR, Ph.D.
             ------------------------                 -------------------------

Title:   Senior Vice President           Title:  President and CEO
      -------------------------------            ------------------------------

Date:    April 20, 1998                  Date:   April 24, 1998
      -------------------------------            ------------------------------

                                      13

<PAGE>

AFFYMETRIX.FINAL DA.4.20.98


                                    *******





                                      14
<PAGE>

                                   EXHIBIT A

[**]

                                     
<PAGE>

                                   EXHIBIT B

[**]

                                     
<PAGE>

                                   EXHIBIT C
                            AFFYMETRIX AFFILIATES


                     THIS PAGE IS INTENTIONALLY LEFT BLANK



                                     
<PAGE>

                                   EXHIBIT D

                            AFFYMETRIX DISTRIBUTORS


                          Amersham Pharmacia Biotech



                                     
                            

<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 JUNE 30, 1998 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                            1148
<SECURITIES>                                    103313
<RECEIVABLES>                                     6400
<ALLOWANCES>                                         0
<INVENTORY>                                       3959
<CURRENT-ASSETS>                                115971
<PP&E>                                           30825
<DEPRECIATION>                                  (7464)
<TOTAL-ASSETS>                                  140281
<CURRENT-LIABILITIES>                            10982
<BONDS>                                            389
                            49857
                                          0
<COMMON>                                        159220
<OTHER-SE>                                     (80167)
<TOTAL-LIABILITY-AND-EQUITY>                    140281
<SALES>                                           8449
<TOTAL-REVENUES>                                 20823
<CGS>                                             5925
<TOTAL-COSTS>                                     5925
<OTHER-EXPENSES>                                 29095
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                1676
<INCOME-PRETAX>                                (12521)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (12521)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (12521)
<EPS-PRIMARY>                                   (0.55)
<EPS-DILUTED>                                   (0.55)
        

</TABLE>


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