AURORA BIOSCIENCES CORP
10-Q, 1997-11-14
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 10-Q


[X]     QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934

        FOR THE QUARTERLY PERIOD ENDED September 30, 1997

                                       or

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


Commission File Number:  0-22669
                        ---------


                         AURORA BIOSCIENCES CORPORATION
            --------------------------------------------------------
             (Exact name of registrant as specified in its charter)


                Delaware                                    33-0669859
- ----------------------------------------               ---------------------
    (State or other jurisdiction of                      (I.R.S. Employer
     incorporation or organization)                     Identification No.)

  11010 Torreyana Road, San Diego, CA                          92121
- ----------------------------------------               ---------------------
(Address of principal executive offices)                     (Zip code)

                                 (619) 452-5000
- --------------------------------------------------------------------------------
              (Registrant's telephone number, including area code)

                 11149 N. Torrey Pines Road, La Jolla, CA 92037
- --------------------------------------------------------------------------------
              (Former name, former address and former fiscal year,
                          if changed since last report)


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 such shorter period that the registrant was required
to file such reports), and (2) has been subject to such filing requirements for
the past 90 days. Yes [X]   No [ ]

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.

<TABLE>
<CAPTION>
                                                                Outstanding at
          Class                                                October 31, 1997
          -----                                                ----------------
<S>           <C>                                                  <C>       
Common Stock, $.001 par value                                      17,029,885
</TABLE>



<PAGE>   2

                         AURORA BIOSCIENCES CORPORATION

                                    FORM 10-Q

                                      INDEX


<TABLE>
<CAPTION>
                                                                                   PAGE NO.
                                                                                   --------
<S>     <C>                                                                           <C>
PART I.  FINANCIAL INFORMATION

        ITEM 1.  Financial Statements

        Balance Sheets - September 30, 1997 (Unaudited) and December 31, 1996..........3

        Statements of Operations (Unaudited) - Three and nine months ended
        September 30, 1997 and 1996....................................................4

        Statements of Cash Flows (Unaudited) - Nine months ended
        September 30, 1997 and 1996....................................................5

        Notes to Financial Statements (Unaudited) - September 30, 1997.................6

        ITEM 2.

        Management's Discussion and Analysis of Financial Condition and
        Results of Operations..........................................................8

PART II.  OTHER INFORMATION

        ITEM 2.  Changes in Securities and Use of Proceeds.............................11

        ITEM 6.  Exhibits and Reports on Form 8-K......................................11

SIGNATURE..............................................................................12
</TABLE>




                                      -2-
<PAGE>   3
                         PART I - FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS.

                         AURORA BIOSCIENCES CORPORATION
                                 BALANCE SHEETS


<TABLE>
<CAPTION>
                                                                     September 30,       December 31,
                                                                          1997               1996
                                                                      ------------       ------------
                                                                       (Unaudited)          (Note)
<S>                                                                   <C>                <C>         
                                     ASSETS
Current assets:
   Cash and cash equivalents                                          $ 29,346,325       $  3,914,038
   Investment securities, available-for-sale                            16,255,344          9,252,870
   Accounts receivable under collaborative agreements                    2,615,694          1,116,523
   Prepaid expenses                                                        546,667            228,029
   Other current assets                                                  2,980,707            169,175
                                                                      ------------       ------------
      Total current assets                                              51,744,737         14,680,635
Equipment, furniture and leaseholds, net                                 3,793,788          1,901,515
Notes receivable from officers and employees                               290,000            200,000
Other assets                                                             1,028,614            732,374
                                                                      ------------       ------------
                                                                      $ 56,857,139       $ 17,514,524
                                                                      ============       ============

                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Accounts payable                                                   $    844,102       $    299,819
   Accrued compensation                                                    205,432            319,770
   Unearned revenue                                                        427,501            250,000
   Capital lease obligations, current portion                              845,077            350,247
                                                                      ------------       ------------
      Total current liabilities                                          2,322,112          1,219,836

Capital lease obligations, less current portion                          2,293,689          1,110,897

Stockholders' equity:
   Convertible preferred stock, $.001 par value; 7,500,000
     and 25,000,000 shares authorized, none and 9,915,973 shares
     issued and outstanding at September 30, 1997 and
     December 31, 1996, respectively                                            --              9,916
   Common stock, $.001 par value, 50,000,000 shares
     authorized, 17,018,141 and 2,865,156 shares issued and
     outstanding at September 30, 1997 and December 31,                                        
     1996, respectively                                                     17,018              2,865
   Additional paid-in capital                                           60,436,426         18,887,790
   Deferred compensation                                                (3,319,484)          (371,573)
   Accumulated deficit                                                  (4,892,622)        (3,345,207)
                                                                      ------------       ------------
      Total stockholders' equity                                        52,241,338         15,183,791
                                                                      ------------       ------------
                                                                      $ 56,857,139       $ 17,514,524
                                                                      ============       ============
</TABLE>

Note: The balance sheet at December 31, 1996 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>   4
                         AURORA BIOSCIENCES CORPORATION
                            STATEMENTS OF OPERATIONS
                                   (UNAUDITED)



<TABLE>
<CAPTION>
                                    Three months ended September 30,      Nine months ended September 30,
                                    -------------------------------       -------------------------------
                                        1997               1996               1997               1996
                                    ------------       ------------       ------------       ------------
<S>                                 <C>                <C>                <C>                <C>         
Revenue:
   Screening systems                $  2,604,056       $         --       $  3,852,056       $         --
   Screening services                    922,907                 --          2,270,407                 --
   License fees                          487,500                 --          1,462,500                 --
                                    ------------       ------------       ------------       ------------
      Total revenue                    4,014,463                 --          7,584,963                 --

Operating expenses:
   Cost of screening systems             996,771                 --          3,263,254                 --
   Cost of screening services            567,437                 --          1,374,198                 --
   Research and development            1,289,841          1,457,514          3,132,912          2,435,683
   General and administrative            829,440            388,613          2,223,820            808,510
                                    ------------       ------------       ------------       ------------
      Total operating expenses         3,683,489          1,846,127          9,994,184          3,244,193
                                    ------------       ------------       ------------       ------------

Income (loss) from operations            330,974         (1,846,127)        (2,409,221)        (3,244,193)

Interest income                          666,338            186,676          1,098,180            416,883
Interest expense                        (100,553)           (13,742)          (236,374)           (13,742)
                                    ------------       ------------       ------------       ------------
Net income (loss)                   $    896,759       $ (1,673,193)      $ (1,547,415)      $ (2,841,052)
                                    ============       ============       ============       ============

Net income (loss) per share         $       0.05       $      (0.13)      $      (0.10)      $      (0.27)
                                    ============       ============       ============       ============

Shares used in computing
   net income (loss) per share        17,576,501         13,180,819         14,751,188         10,711,591
                                    ============       ============       ============       ============
</TABLE>



                             See accompanying notes.




                                      -4-
<PAGE>   5
                         AURORA BIOSCIENCES CORPORATION
                            STATEMENTS OF CASH FLOWS
                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                                  Nine months ended September 30,
                                                                  -------------------------------
                                                                      1997               1996
                                                                  ------------       ------------
<S>                                                               <C>                <C>          
OPERATING ACTIVITIES:
Net loss                                                          $ (1,547,415)      $ (2,841,052)
Adjustments to reconcile net loss to net cash used in
  operating activities
   Depreciation and amortization                                       616,977             46,062
   Amortization of deferred compensation                               572,493                 --
   Change in operating assets and liabilities:
      Accounts receivable under collaborative agreements            (1,499,171)                --
      Prepaid expenses and other current assets                     (3,130,170)          (713,033)
      Accounts payable and accrued compensation                        429,945            299,440
      Unearned revenue                                                 177,501                 --
                                                                  ------------       ------------
Net cash used in operating activities                               (4,379,840)        (3,208,583)
                                                                  ------------       ------------
INVESTING ACTIVITIES:
Purchases of investment securities                                 (14,472,855)       (12,139,632)
Sales and maturities of investment securities                        7,470,381          1,500,000
Purchases of equipment, furniture and leaseholds                      (382,867)          (312,362)
Notes receivable from officers and employees                           (90,000)           (23,331)
Other assets                                                          (296,240)          (133,822)
                                                                  ------------       ------------
Net cash used in investing activities                               (7,771,581)       (11,109,147)
                                                                  ------------       ------------
FINANCING ACTIVITIES:
Issuance (cost) of convertible preferred stock, net                    (36,528)        15,617,650
Issuance of common stock, net                                       38,068,997             78,013
Issuance of notes payable                                                   --            449,997
Principal payments on capital lease obligations                       (448,761)           (47,768)
                                                                  ------------       ------------
Net cash provided by financing activities                           37,583,708         16,097,892
                                                                  ------------       ------------

Net increase in cash and cash equivalents                           25,432,287          1,780,162

Cash and cash equivalents at beginning of period                     3,914,038             11,119
                                                                  ------------       ------------

Cash and cash equivalents at end of period                        $ 29,346,325       $  1,791,281
                                                                  ============       ============

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid                                                     $    236,374       $     13,742
                                                                  ============       ============
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND
   FINANCING ACTIVITIES:
Equipment acquired under capital leases                           $  2,126,383       $    991,319
                                                                  ============       ============
Conversion of notes payable to convertible preferred stock        $         --       $    924,997
                                                                  ============       ============
</TABLE>



                             See accompanying notes.




                                      -5-
<PAGE>   6
                         AURORA BIOSCIENCES CORPORATION

                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1997
                                   (UNAUDITED)

1.       BASIS OF PRESENTATION

        The accompanying unaudited financial statements of Aurora Biosciences
        Corporation ("Aurora" or the "Company") 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 adjustments, considered
        necessary for a fair presentation have been included. Interim results
        are not necessarily indicative of results for a full year. These
        financial statements should be read in conjunction with the audited
        financial statements and footnotes thereto for the year ended December
        31, 1996, included in the Company's prospectus dated June 19, 1997,
        filed with the Securities and Exchange Commission.

2.      STOCKHOLDERS' EQUITY

        On June 19, 1997, the Company completed an initial public offering of
        4,000,000 shares of common stock at $10.00 per share, with the Company
        receiving proceeds, net of underwriting discounts and commissions, of
        $37.2 million. On July 23, 1997, the Company sold an additional 150,184
        shares of common stock in connection with the partial exercise of an
        over-allotment option granted to the underwriters for net proceeds of
        $1.4 million.

3.      NET INCOME (LOSS) PER SHARE

        Net income (loss) per share is computed using the weighted average
        number of common shares and dilutive common stock equivalents
        outstanding during the periods, as adjusted for the effects of certain
        rules of the Securities and Exchange Commission for the periods prior to
        the Company's initial public offering.

        In February 1997, the Financial Accounting Standards Board issued
        Statement No. 128, Earnings per Share, which is required to be adopted
        on December 31, 1997. At that time the Company will be required to
        change the method currently used to compute earnings per share and to
        restate all prior periods. Under the new requirements for calculating
        basic earnings per share, the dilutive effect of stock options will be
        excluded. The impact of the adoption of Statement No. 128 on the
        calculation of earnings per share is not expected to be material.

4.       COLLABORATIVE AGREEMENTS

        The Company entered into a collaborative agreement in September 1997
        with Warner-Lambert Company ("Warner-Lambert") regarding the development
        and installation of the Company's ultra-high throughput screening
        ("UHTS") system. Under the terms of the agreement, the Company will
        develop and separately install three components to be integrated into
        one complete UHTS system at Warner-Lambert's Parke-Davis pharmaceutical
        research facility. In return, Warner-Lambert is obligated to make
        certain payments to the Company in the form of non-refundable up-front
        fees, milestone payments, delivery or installation payments and ongoing
        research and co-development funding. The Company is obligated to provide
        service and support for the installed UHTS system for a limited period
        of time.




                                      -6-
<PAGE>   7
                         AURORA BIOSCIENCES CORPORATION

                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1997
                                   (UNAUDITED)



        The Company and Warner-Lambert will also co-develop high throughput
        screening assays for use by Warner-Lambert or by the Company in
        connection with screening services to be performed for Warner-Lambert.
        In addition to certain payments to be made by Warner-Lambert for the use
        of these assays, assay technologies and screening services,
        Warner-Lambert will also make certain milestone and royalty payments to
        the Company if Warner-Lambert develops and commercializes compounds
        identified using co-developed high throughput screening assays.










                                      -7-
<PAGE>   8
                         AURORA BIOSCIENCES CORPORATION
                               SEPTEMBER 30, 1997



ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
        AND RESULTS OF OPERATIONS

This Form 10-Q contains certain statements of a forward-looking nature relating
to future events or the future financial performance of the Company. Such
statements are only predictions and actual events or results may differ
materially. Factors that could cause or contribute to such differences include,
without limitation, those discussed in this Item 2 as well as those discussed in
the Company's prospectus dated June 19, 1997 relating to the Company's initial
public offering.

OVERVIEW

Aurora Biosciences Corporation ("Aurora" or the "Company") designs and develops
proprietary drug discovery systems, services and technologies to accelerate and
enhance the discovery of new medicines. The Company is developing an integrated
technology platform comprised of a portfolio of proprietary fluorescent assay
technologies and an ultra-high throughput screening ("UHTS") system designed to
allow assay miniaturization and to overcome many of the limitations associated
with the traditional drug discovery process.

Although the Company was profitable for the quarter ended September 30, 1997,
the Company had an accumulated deficit of $4.9 million as of September 30, 1997.
The Company's ability to achieve sustained profitability will depend in part on
its ability to successfully develop its UHTS system, provide screen development
and screening services to pharmaceutical and biotechnology companies, achieve
acceptable performance specifications for the UHTS system and gain industry
acceptance of its systems, services and technologies. Payments from corporate
collaborators and interest income are expected to be the only sources of revenue
for the foreseeable future. Royalties or other revenue from commercial sales of
products developed from any compounds identified by using the Company's
technologies are not expected for at least several years, if at all. Payments
under collaborative agreements will be subject to significant fluctuation in
both timing and amount. Furthermore, the Company will continue to follow a
strategy of investing in new technologies to expand its core drug discovery
capabilities. Accordingly, the Company's results of operations for any period
may not be comparable to the results of operations for any other period.

RESULTS OF OPERATIONS FOR THE THREE AND NINE MONTHS ENDED
SEPTEMBER 30, 1997 AND 1996

Revenue from screening systems, screening services and license fees totaled
$2,604,000, $923,000 and $488,000, respectively, for the three months ended
September 30, 1997, and $3,852,000, $2,270,000 and $1,463,000, respectively, for
the nine months ended September 30, 1997. There was no revenue recorded for the
three and nine months ended September 30, 1996. The 1997 revenue from screening
systems primarily resulted from the Company's September 1997 collaborative
agreement with Warner-Lambert as well as previous collaborative agreements with
Bristol-Myers Squibb Pharmaceutical Research Institute ("Bristol-Myers Squibb"),
Eli Lilly and Company ("Eli Lilly"), Roche Bioscience Corporation ("Roche
Bioscience") and the Company's technology alliance with Packard Instrument
Company. Screening services revenue in 1997 resulted from the Company's
collaborative agreements with Bristol-Myers Squibb, Eli Lilly, Roche Bioscience
and Allelix Biopharmaceuticals, Inc. ("Allelix Biopharmaceuticals"). License
fees revenue in 1997 resulted from the Company's collaborative agreements with
Bristol-Myers Squibb and Eli Lilly.

Cost of screening systems and cost of screening services totaled $997,000 and
$567,000, respectively, for the three months ended September 30, 1997 and
$3,263,000 and $1,374,000, respectively, for the nine months ended September 30,
1997. There was no cost of screening systems or cost of screening 




                                      -8-
<PAGE>   9
                         AURORA BIOSCIENCES CORPORATION
                               SEPTEMBER 30, 1997



services for the three and nine months ended September 30, 1996, as the Company
had not yet entered into any collaborations with members of its UHTS system
syndicate and had not yet begun to develop screens or perform screening services
as part of other collaborations.

Research and development expenses remained relatively constant at $1,290,000 for
the three months ended September 30, 1997 compared to $1,458,000 for the three
months ended September 30, 1996. This was primarily because efforts to develop
Aurora's UHTS system during the three months ended September 30, 1997 were
shared with members of the Company's UHTS system syndicate, including
Bristol-Myers Squibb and Eli Lilly and Company. Research and development
expenses increased to $3,133,000 for the nine months ended September 30, 1997
from $2,436,000 for the nine months ended September 30, 1996, despite the fact
that efforts to develop Aurora's UHTS system were shared with members of the
Company's UHTS system syndicate in 1997. The increase was attributable to
increased research and development personnel expenses, increased equipment,
depreciation and facilities expenses in connection with the expansion of
operations, the purchase of laboratory supplies and payments under technology
development and license agreements related to continued investment in new
technology.

General and administrative expenses increased to $829,000 from $389,000 for the
three months ended September 30, 1997 and 1996, respectively, and increased to
$2,224,000 from $809,000 for the nine months ended September 30, 1997 and 1996,
respectively. The increases were attributable to increased management and
administrative personnel expenses, increased depreciation and facilities
expenses in connection with the expansion of operations and legal and
professional fees incurred in connection with the overall scale-up of the
Company's operations and business development efforts.

Net interest income increased to $566,000 from $173,000 for the three months
ended September 30, 1997 and 1996, respectively, and increased to $862,000 for
the nine months ended September 30, 1997 from $403,000 for the same period in
1996. These increases reflected interest earned on increased cash and investment
balances resulting from receipts under collaborative agreements and the
Company's initial public offering in June 1997. Interest income was partially
offset by interest expense incurred on capital lease obligations entered into
during the second half of 1996 and the first nine months of 1997.

LIQUIDITY AND CAPITAL RESOURCES

At September 30, 1997, Aurora held cash, cash equivalents and investment
securities available-for-sale of $45.6 million and working capital of $49.4
million. The Company has funded its operations to date primarily through the
issuance of equity securities with aggregate net proceeds of $57.0 million,
receipts from corporate collaborations and strategic technology alliances of
$7.7 million, capital equipment lease financing of $3.7 million and interest
income of $1.7 million through September 30, 1997.

The Company has entered into various strategic technology agreements with third
parties regarding the development of instrumentation technology which require
the Company to make future payments totaling approximately $840,000 through 1998
if all milestones are met. In addition, the Company has entered into license
agreements with third parties regarding certain inventions and technologies for
which the Company is obligated to make future payments totaling $750,000 over
the next seven years.

To date, all revenue received by the Company has been from collaborations,
interest earned on cash and investment balances and technology alliances. The
Company expects that substantially all revenue for the foreseeable future will
come from collaborators and interest income.

The Company has entered into collaborative agreements with Bristol-Myers Squibb,
Eli Lilly, Warner-Lambert, Roche Bioscience and Allelix Biopharmaceuticals. The
Company's ability to achieve 




                                      -9-
<PAGE>   10
                         AURORA BIOSCIENCES CORPORATION
                               SEPTEMBER 30, 1997



sustained profitability will be dependent in part upon its ability to enter into
additional corporate collaborations. Although the Company is actively seeking to
enter into additional collaborative agreements, there can be no assurance that
the Company will be able to negotiate such additional collaborative agreements
on acceptable terms, if at all, or that such current or future collaborative
agreements will be successful and provide the Company with expected benefits.











                                      -10-
<PAGE>   11
                         AURORA BIOSCIENCES CORPORATION
                               SEPTEMBER 30, 1997



                           PART II - OTHER INFORMATION

ITEM 2.  CHANGES IN SECURITIES AND USE OF PROCEEDS

On June 18, 1997, the Company's Form S-1 registration statement (File no.
333-23407) was declared effective by the Securities and Exchange Commission. The
registration statement, as amended, covered the offering of 4,000,000 shares of
the Company's Common Stock, $.001 par value. The offering commenced on June 18,
1997 and the sale to the public of 4,000,000 shares of Common Stock at $10.00
per share was completed on June 24, 1997 for an aggregate price of $40,000,000.
The registration statement covered an additional 600,000 shares of Common Stock
that the underwriters had the option to purchase solely to cover
over-allotments. The managing underwriters for the offering were Alex. Brown &
Sons, Inc., Hambrecht & Quist and Robertson, Stephens & Company. On July 23,
1997, the underwriters exercised their option to purchase 150,184 additional
shares of Common Stock. The offering was terminated on July 24, 1997, at which
time the remaining 449,816 shares of Common Stock covered by the registration
statement were deregistered. A total of 4,150,184 shares of Common Stock were
sold in the offering at an aggregate price of $41,501,840.
All of the shares sold in the offering were sold by the Company.

Expenses incurred by the Company through September 30, 1997 in connection with
the issuance and distribution of Common Stock in the offering included
underwriting discounts and commissions of $2,905,129 and other expenses of
$579,311. Total offering expenses of $3,484,440 resulted in net offering
proceeds to the Company of $38,017,400. No expenses were paid to directors,
officers or affiliates of the Company or 10% owners of any class of equity
securities of the Company.

Of the net offering proceeds to the Company of $38.0 million, through September
30, 1997 approximately $4.4 million was used for general corporate purposes,
approximately $1.8 million was used for facilities expansion and improvements
and approximately $400,000 was used for enhancement of internal research and
development capabilities. No payments were made to directors, officers or
affiliates of the Company or 10% owners of any class of equity securities of the
Company, other than compensation payments to officers of the Company.
Approximately $31.4 million of the net offering proceeds remain as working
capital, primarily in the form of cash and cash equivalents with approximately
$7.0 million held as temporary investments.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

(a)     Exhibits:

        10.26    First Amendment, dated September 1, 1997, to Multi-Tenant
                 Industrial Lease between the Registrant and AEW/LBA Acquisition
                 Co. II, LLC

        10.27*   Collaborative Research and License Agreement dated September
                 22, 1997 between the Registrant and Warner-Lambert Company

        11.1     Statement regarding Computation of Net Income (Loss) per Share

        27.1     Financial Data Schedule

        *  Confidential Treatment has been requested with respect to certain
           portions of this exhibit. Omitted portions have been filed separately
           with the Securities and Exchange Commission.

(b) Reports on Form 8-K filed during the quarter ended September 30, 1997:

        None




                                      -11-
<PAGE>   12
                         AURORA BIOSCIENCES CORPORATION
                               SEPTEMBER 30, 1997



                                    SIGNATURE



Pursuant to the requirements of the Securities and Exchange Act of 1934, the
registrant has duly caused this report to be signed in its behalf by the
undersigned thereunto duly authorized.


                                 Aurora Biosciences Corporation




Date: November 14, 1997          By:  /s/ Deborah J. Tower
                                    --------------------------------------------
                                 Deborah J. Tower
                                 Vice President, Finance and Administration
                                 on behalf of the Registrant and as Registrant's
                                 Principal Financial and Accounting Officer)






                                      -12-

<PAGE>   1
                                                                   EXHIBIT 10.26



                FIRST AMENDMENT TO MULTI-TENANT INDUSTRIAL LEASE
                                  (TRIPLE NET)


This FIRST AMENDMENT TO MULTI-TENANT INDUSTRIAL LEASE (TRIPLE NET) (the "FIRST
AMENDMENT") is entered into as of September 1, 1997, by and between AEW/LBA
ACQUISITION CO. II, LLC, a California limited liability company ("LANDLORD") and
AURORA BIOSCIENCES CORPORATION, a Delaware corporation ("TENANT").


                                R E C I T A L S :


A. Landlord and Tenant entered into that certain Multi-Tenant Industrial Lease
(Triple Net) dated April 7, 1997 (the "LEASE") for certain premises (the
"ORIGINAL PREMISES") located within a multi-tenant industrial building located
at 11010 Torreyana Road, La Jolla, California 92037. All terms not otherwise
defined in this First Amendment shall have the same meanings as set forth in the
Lease.

B. Tenant desires to expand the Original Premises to include all of the rentable
square footage located on the second (2nd) floor of the Building (the "EXPANSION
PREMISES").

C. Landlord and Tenant desire to amend the Lease to provide for the inclusion of
the Expansion Premises into the Premises upon the terms set forth herein.


                               A G R E E M E N T :


NOW, THEREFORE, in consideration of the foregoing, the mutual covenants
contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

1. EXPANSION PREMISES. Section 1.5 of the Summary is amended to include the
Expansion Premises within the definition of the Premises.

2. MONTHLY OPERATING EXPENSE CHARGE. Section 1.6 of the Summary is amended to
increase Tenant's Share from 67.73% to 100%.

3. RENT. Section 1.9 of the Summary is deleted and the following is substituted
therefor:

<TABLE>
<CAPTION>
   YEAR               ANNUAL BASE RENT                       MONTHLY BASIC RENT
   ----               ----------------                       ------------------
    <S>                 <C>                                    <C>
     1*                 $1,632,888.00                          $136,074.00**
     2                  $1,608,075.60                           $134,006.30
     3                  $1,732,848.90                           $144,404.08
     4                  $1,783,965.10                           $148,663.76
     5                  $1,838,165.70                           $153,180.48
     6                  $1,893,787.90                           $157,815.66
     7                  $1,949,169.70                           $162,430.81
     8                  $2,007,764.10                           $167,313.68
     9                  $2,067,911.70                           $172,325.98
    10                  $2,131,363.80                           $177,613.65
    11                  $2,194,759.20                           $182,896.60
</TABLE>

*   Plus any partial month at the beginning of the Term.
**  Notwithstanding the foregoing, Monthly Basic Rent for each of the months of
    October, November and December of 1997 shall be $34,074.00.

4. RIGHT OF FIRST REFUSAL. Tenant's right of first refusal under Section 1.4 of
the Lease is deleted.

5. VERIFICATION OF RENTABLE SQUARE FEET OF PREMISES. Section 1.5 of the Lease is
deleted. The parties stipulate that, for purposes of the Lease, the Premises and
the Building contain 81,204 rentable square feet.

6. MANAGEMENT FEE. The Management Fee for the first two (2) years of the Term
shall be Thirty-Eight Thousand Nine Hundred Seventy-Seven and 92/100 Dollars
($38,977.92). Thereafter, the Management Fee will be equal to two percent (2%)
of the Annual Basic Rent, as otherwise set forth in Section 3.4 of the Lease.

7. LANDLORD'S REPAIR OBLIGATIONS. Section 11.3 of the Lease is amended by
deleting clause (b) of the first sentence. Except as provided in Paragraph 8
below, Landlord is no longer responsible for



<PAGE>   2

the repair, maintenance or replacement of the plumbing, heating, ventilating,
air conditioning, sprinkler or electrical systems within the Building.

8. TENANT'S REPAIR OBLIGATIONS. Tenant's obligations under Section 11.4 are
amended to include the following items: plumbing, heating, ventilating, air
conditioning, sprinkler and electrical systems within the Building (the "BASIC
ELEMENTS"). Notwithstanding the foregoing, if any item of the Basic Elements
cannot be repaired other than at a cost which is in excess of sixty percent
(60%) of the cost of replacing such item of the Basic Elements (and the need for
such repair is not the result of any act, neglect, fault or omission of Tenant
or Tenant's Parties), then such item of the Basic Elements shall be replaced by
Landlord at Landlord's initial cost, and Tenant shall pay Landlord as Tenant's
prorata share thereof and as additional rent, each month during the remainder of
the Term on the date on which Monthly Basic Rent is due, an amount equal to the
product of multiplying the cost of such replacement by a fraction, the numerator
of which is one (1), and the denominator of which is the number of months of the
useful life of such replacement as such useful life is specified pursuant to
Federal income tax regulations or guidelines for depreciation thereof (including
interest on the unamortized balance as is then commercially reasonable in the
judgment of Landlord and Tenant), with Tenant reserving the right to prepay its
obligation at any time.

9. BROKERS. The provisions of Section 8 of the Lease concerning brokers applies
to this First Amendment and the Expansion Premises.

10. CONSTRUCTION ALLOWANCE. The Construction Allowance under Paragraph 6 of the
Work Letter Agreement is increased to Three Million Four Hundred Ten Thousand,
Five Hundred Fifteen Dollars ($3,410,515.00).

11. SPECIFIC IMPROVEMENTS BY LANDLORD. Landlord will, at its sole cost, perform
the following work in the Building: (i) remove the liebert air conditioning
units in the computer room and repair any associated damage to the roof
resulting therefrom; (ii) monocoat the steel beams in the Building as necessary;
(iii) cause the elevators and stairwells to comply with the Act (but without
regard to any alterations to be made by Tenant); and (iv) improve the restrooms
on the second (2nd) floor of the Building in accordance with Landlord's standard
design criteria for the Building and in accordance with the Act.

12. SPECIFIC TENANT IMPROVEMENTS. Tenant shall, at its sole cost (but subject to
reimbursement from the Construction Allowance), (i) be responsible for any
cosmetic improvements to the elevator cabs, subject to Landlord's approval of
the plans therefor and (ii) improve the lobby area of the Building, in
accordance with plans approved by Landlord, concurrently with the construction
of the Tenant Improvements.

13. CONTINUED EFFECTIVENESS OF LEASE. Except as provided herein, the Lease
remains in full force and effect.

IN WITNESS WHEREOF, the parties have executed this First Amendment as of the day
and year first above written.

        "TENANT"             AURORA BIOSCIENCES CORPORATION,
                             a Delaware corporation

                             By:    /s/   Deborah J. Tower
                                    Sr. Director, Finance and Administration


        "LANDLORD"           AEW/LBA ACQUISITION CO. II, LLC,
                             a California limited liability company

                             By:    LBA, Inc., a California corporation,
                                    its agent

                             By:    /s/   Phil Belling
                                    Principal

                                      -2-



<PAGE>   1
                                                                  EXHIBIT 10.27



                  COLLABORATIVE RESEARCH AND LICENSE AGREEMENT



                                    BETWEEN


                             WARNER-LAMBERT COMPANY


                                      AND


                         AURORA BIOSCIENCES CORPORATION


Certain confidential portions of this Exhibit were omitted by means of blackout
of the text (the "Mark"). This Exhibit has been filed separately with the
Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 24b-2 under the
Securities Exchange Act.
<PAGE>   2
                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                          <C>
1. DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
2. SYSTEM DEVELOPMENT AND DELIVERY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
  2.1. System Development.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
3. COLLABORATIVE SCREEN PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
  3.1. Collaborative Screen Program.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
  3.2. Access to the Aurora Reporter System Technology and Aurora Reporter System Patent Rights.  . . . . .  16
  3.3. Supply of Reporters.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
  3.4. Ownership of Data.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
  3.5. Development of Products.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
  3.6. Laboratory Facilities and Personnel.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
4. SERVICE AND SUPPORT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
  4.1. Service and Support.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
5. INTELLECTUAL PROPERTY RIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
  5.1. Grant of Rights from Aurora to PD.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
  5.2. Grant of Rights from PD to Aurora.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
  5.3. Ownership of  Intellectual Property and Property   . . . . . . . . . . . . . . . . . . . . . . . . .  19
6. PAYMENTS OF ROYALTIES, ACCOUNTING FOR ROYALTIES AND RECORDS. . . . . . . . . . . . . . . . . . . . . . .  20
  6.1. Payment and Reporting.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
  6.2. Currency of Payment.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
  6.3. Taxes Withheld.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
  6.4. Records.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
  6.5. Trade Secret Royalty.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
7. INTELLECTUAL PROPERTY ENFORCEMENT AND DEFENSE OF INFRINGEMENT CLAIMS . . . . . . . . . . . . . . . . . .  23
  7.1. Intellectual Property Enforcement.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
  7.2. Defense of Infringement Claims Pertaining to PD Hits, Development Compounds and Products.  . . . . .  23
  7.3. Defense of Infringement Claims Pertaining to Aurora Technology and  Aurora Patent Rights.  . . . . .  23
8. TREATMENT OF CONFIDENTIAL INFORMATION; PUBLICITY . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
  8.1. Confidentiality.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
  8.2. Publication of Results.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
  8.3. Publicity.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
9. PATENT PROSECUTION AND COPYRIGHTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
  9.1. Patents.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
  9.2. Copyrights.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
10. WARRANTIES AND INDEMNIFICATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
  10.1. Mutual Representations and Warranties.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
  10.2. Warranties and Aurora Technology.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
  10.3. Aurora Indemnification.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
</TABLE>





PD.AURORA COLLABORATION AGREEMENT      I


<PAGE>   3

<TABLE>
<S>                                                                                                          <C>
  10.4. Warranties and PD Technology.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
  10.5. PD Indemnification.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
11. TERM, PARTIAL PERFORMANCE AND TERMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
  11.1. Term.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
  11.2. Termination By Mutual Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
  11.3. Termination Without Cause by PD.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
  11.4. Partial Performance.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
  11.5. Termination for Cause.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
  11.6. Effect of Bankruptcy.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
  11.7. Effect of Expiration or Termination.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
12. MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  12.1. Assignment.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  12.2. Binding Effect.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  12.3. Force Majeure.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  12.4. Notices.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  12.5. Governing Law and Jurisdiction.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
  12.6. Waiver.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
  12.7. Severability.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
  12.8. Independent Contractors.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
  12.9. Counterparts.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
  12.10. Entire Agreement.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
  12.11. No Third Party Beneficiaries.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
  12.12. Construction.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
  12.13. Dispute Resolution.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
</TABLE>























PD.AURORA COLLABORATION AGREEMENT      II


<PAGE>   4
                  COLLABORATIVE RESEARCH AND LICENSE AGREEMENT

THIS AGREEMENT is entered into as of the Effective Date (as defined below) by
and between WARNER-LAMBERT COMPANY, a Delaware corporation, having offices at
2800 Plymouth Road Ann Arbor, Michigan, 48105 ("PD"), and AURORA BIOSCIENCES
CORPORATION, a Delaware corporation having offices at 11149 North Torrey Pines
Road, La Jolla, California 92037 ("Aurora").

                                    RECITALS

WHEREAS, Aurora has expertise in the development of automated ultra-high
throughput screening systems and screening biologies/chemistries used therein;
and

WHEREAS, Aurora has the scientific expertise and capacity to undertake the
alliance activities described below; and

WHEREAS, PD has the capability to undertake screening and development of drug
products for the prevention, and treatment of human diseases and disorders.

NOW, THEREFORE, in consideration of the foregoing premises and of the
covenants, representations and agreements set forth below, the parties agree as
follows: 

1.       DEFINITIONS

As used herein, the following terms shall have the following meanings:

"Affiliate" means any corporation, association or other entity which directly
or indirectly controls, is controlled by or is under common control with the
party in question.  As used herein, the term control shall mean direct or
indirect beneficial ownership of more than *** of the voting or income interest
in such corporation or other business entity.

"Agreement" means this agreement, together with all appendices, exhibits and
schedules hereto, and as the same may be amended or supplemented from time to
time hereafter by a written agreement duly executed by authorized
representatives of each party hereto.

"Aurora Copyrights" means all copyrights throughout the world owned or
Controlled by Aurora that permit the operation of the System in accordance with
this Agreement.

"Aurora Patent Rights" means the Aurora Reporter System Patent Rights and the
Aurora  System Patent Rights.

"Aurora Reporter" means any of the following: ***

"Aurora Reporter System" means the ***





PD.AURORA COLLABORATION AGREEMENT      1


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   5
"Aurora Reporter System Technology" means ***

"Aurora Reporter System Patent Rights" means ***

"Aurora Screening Program" shall have the meaning ***

"Aurora Technology" means ***

"Aurora System Patent Rights" means ***

"Aurora System Technology" means ***

"Collaborative Screen" means ***

"Collaborative Screen Program" shall have the meanings ***

"Compound" means ***

"Compound Supply" has the meaning ***

"Confidential Information" means ***

"Control" or "Controlled" means ***

"CPI" shall have the meaning ***

"CSP Steering Committee" shall have the meaning ***

"CSP Work Plan" shall have the meaning ***

"Deliverables" has the meaning ***

"Derivative" means ***





PD.AURORA COLLABORATION AGREEMENT      2


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   6
***

"Development Compound" means ***

"Effective Date" means the date that this Agreement is executed by the last
party to so execute.

"FDA" shall mean the United States Food and Drug Administration, or any
successor agency having regulatory jurisdiction over the manufacture,
distribution and sale of drugs in the United States or equivalent in any other
jurisdiction.

"FTE" shall have the meaning ***

"Hit" means ***

"IND" means ***

"Internal Research" means ***

"Invention" means ***

"Know-How" means ***

"Licensee" means ***

"Licensor" means ***

"Manufacturing Cost" means ***








PD.AURORA COLLABORATION AGREEMENT      3


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   7
***

"Materials" means ***

"Module One" has the meaning ***

"Module Two" has the meaning ***

"Module Three" has the meaning ***

"NDA" means ***

"Net Sales" shall mean ***:

"Patent Rights" means ***




















PD.AURORA COLLABORATION AGREEMENT      4


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   8
"PD Copyrights" means ***

"PD Patent Rights" means ***

"PD Technology" means ***

"Person" shall mean ***

"Phase III Clinical Trial" means ***

"Product" means ***

"Royalty Term" means ***

"Selection Procedure" ***

"Specifications" ***

"System" means ***

"System Steering Committee" shall have the meaning ***

"System Target Delivery Date" has the meaning ***

"Technology" ***




















PD.AURORA COLLABORATION AGREEMENT      5


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   9
"Term" means ***

"Territory" means ***

"Third Party" means ***

"Tracking Record" shall have the meaning ***

"Valid Claim" means:  ***

"Validation" has the meaning ***

2.       SYSTEM DEVELOPMENT AND DELIVERY

         2.1.    System Development.

         ***

                 2.1.1.   Project Management.

                 The parties shall establish a committee to coordinate the
                 development *** The System Steering Committee will meet at
                 least three times per year at mutually agreed upon times and
                 locations using mutually agreed upon meeting formats,
                 including tele- and video-conferencing.  On an alternating
                 basis, one party shall promptly prepare and deliver to the
                 members of the System Steering Committee minutes in respect
                 thereof, for review and approval by both parties.  ***





















PD.AURORA COLLABORATION AGREEMENT      6


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   10
                 ***

                 Aurora will also submit progress reports to the System
                 Steering Committee at such time(s) as the System Steering
                 Committee may reasonably request and no less than twice per
                 year.

                 2.1.2.   Development; Delivery.

                 From time to time during the term of this Agreement, PD
                 representatives shall have the right, upon reasonable advance
                 written notice to Aurora, to visit the facilities where the
                 System is being developed to verify the information in the
                 progress reports submitted to the System Steering Committee
                 and to confirm Aurora's compliance with the terms hereof.

                          2.1.2.1.         Development.  ***

                          i)      Module One - ***

                          ii)     Module Two - ***

                          iii)    Module Three - ***
                          2.1.2.2.         Shipment, and Installation.  Aurora
                                  will be responsible for the appropriate
                                  packaging of all Deliverables to be delivered
                                  to PD and instructions for special handling
                                  thereof.  PD will be responsible ***















PD.AURORA COLLABORATION AGREEMENT      7


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   11
                 ***

                 2.1.3.   Validation Testing.

                 All Deliverables shall be subject to testing by or for Aurora.
                 ***

                 2.1.4.   Payments Relating to Development of the System.

                 PD will make the following payments to Aurora in consideration
                 of the *** System and its modules:

                          2.1.4.1.         A payment of ***

                          2.1.4.2.         Module One:  A payment of ***

                          2.1.4.3.         Module Two:  A payment of ***

                          2.1.4.4.         Module Three: A payment of ***

























PD.AURORA COLLABORATION AGREEMENT      8


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   12
                                  ***

                                  In the event that the PD facility necessary
                                  for the installation of the Deliverables
                                  required by Sections 2.1.2.1 (i), 2.1.2.1
                                  (ii), or  2.1.2.1 (iii),  is unavailable
                                  after thirty (30) days of the receipt by PD
                                  of any such Deliverables, PD will make any
                                  remaining payment regarding such Deliverables
                                  under Sections 2.1.4.2, 2.1.4.3, or 2.1.4.4
                                  to Aurora.

                          2.1.4.5.         ***

                 2.1.5.   After Payment of all Deliverables for the System.

                 ***

                 2.1.6.   Syndicate Formation and Limitations.

                 It is understood that Aurora is seeking to collaborate with,
                 and grant certain license rights to, Third Parties with
                 respect to the use and installation of a system similar to the
                 System.  ***





















PD.AURORA COLLABORATION AGREEMENT      9


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   13

         ***

         ***
3.       COLLABORATIVE SCREEN PROGRAM
         3.1.    Collaborative Screen Program.

         For a period of *** years following the Effective Date, the parties
         will collaborate in developing and validating Collaborative Screens as
         part of a development program (a "Collaborative Screen Program" or a
         "CSP"), as follows:

                 3.1.1.   Screen Development Program.

                          PD and Aurora will collaborate to develop no less
                          than *** high throughput and/or ultra high throughput
                          screens per each consecutive twelve (12) month period
                          beginning on the Effective Date in accordance with
                          this Agreement.

                          3.1.1.1.         Screen Selection.  Within *** of the
                                  Effective Date PD will begin to propose in
                                  writing to Aurora molecular targets.  For
                                  each proposed molecular target, PD shall
                                  provide Aurora with a written proposal
                                  describing such target.  Within thirty (30)
                                  days of receiving such information, and
                                  further information as Aurora may

























PD.AURORA COLLABORATION AGREEMENT      10


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   14
                                  reasonably request regarding a proposed
                                  molecular target, Aurora shall notify PD in
                                  writing whether Aurora reasonably believes
                                  that the development of a Collaborative
                                  Screen based on the proposed molecular target
                                  is reasonably feasible and if it is
                                  consistent with Aurora's Third Party
                                  obligations (the "Selection Procedure").
                                  Each year, for the period *** following the
                                  Effective Date, PD and Aurora will repeat the
                                  Selection Procedure until Aurora, using
                                  reasonable efforts, has selected *** for such
                                  year, for which screen development shall be
                                  initiated.

                                  The molecular targets proposed by PD shall be
                                  targets that PD reasonably believes to be
                                  amenable for the development of a high
                                  throughput screen using Aurora Technology.

                          3.1.1.2.         CSP Steering Committee.  No later
                                  that *** after the Effective Date, the
                                  parties shall establish a CSP Steering
                                  Committee (the "CSP Steering Committee").
                                  The CSP Steering Committee shall consist of
                                  *** representatives designated by PD and ***
                                  representatives designated by Aurora.  Each
                                  representative will have one vote resulting
                                  in each party having exactly ***.  Decisions
                                  by the CSP Steering Committee will be made by
                                  unanimous vote, at a meeting where a quorum
                                  of *** are present.  The CSP Steering
                                  Committee will meet at least three times per
                                  year at mutually agreed upon times and
                                  locations using mutually agreed upon meeting
                                  formats, including tele- and
                                  video-conferencing.

                                  On an alternating basis, one party shall
                                  promptly prepare and deliver to the members
                                  of the CSP Steering Committee minutes in
                                  respect thereof, for review and approval by
                                  both parties.  ***

                                  The CSP Steering Committee will ***

                                  Promptly following mutual agreement on the
                                  selection of each target, the CSP Steering
                                  Committee will coordinate the preparation of
                                  a work plan (a "CSP Work Plan"), which





PD.AURORA COLLABORATION AGREEMENT      11


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   15
                                  shall set forth the respective
                                  responsibilities of the parties in the
                                  development of each Collaborative Screen, and
                                  which must be ***  Each such CSP Work Plan
                                  will also contain a description of the
                                  specific deliverables and documentation to be
                                  produced, the dates by which such activities
                                  shall be accomplished by the parties, and
                                  validation criteria for each Collaborative
                                  Screen.

                                  Promptly following the approval of each CSP
                                  Work Plan, the parties will commence their
                                  respective duties under the CSP Work Plan for
                                  the development of the applicable
                                  Collaborative Screen.  All work under a CSP
                                  Work Plan shall be performed in accordance
                                  with the provisions of this Agreement, and
                                  each party will use its reasonable efforts to
                                  complete its obligations under the CSP Work
                                  Plan as expeditiously as practicable.

                          3.1.1.3.         Payments for Screen Development.  As
                                  partial consideration for Collaborative
                                  Screens to be developed, the development of
                                  Aurora Reporter System Technology, and Aurora
                                  Screening Programs to be performed under
                                  Section 3.1.1.5 by Aurora, PD shall commit to
                                  fund ***  Such funding shall be payable in
                                  quarterly payments beginning with a first
                                  payment ***  Such payments shall be
                                  non-refundable and non-creditable.

                                  ***





PD.AURORA COLLABORATION AGREEMENT      12


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   16
                                  ***

                                  If Aurora determines that the expenses that
                                  would be incurred by Aurora with respect to
                                  the development of Collaborative Screens
                                  during any year of such *** would exceed such
                                  funding, Aurora shall notify PD, and in such
                                  event the CSP Steering Committee shall in
                                  good faith determine the amount of additional
                                  funding to be provided to Aurora by PD for
                                  the applicable Collaborative Screen Programs.
                                  Such additional funding shall be calculated
                                  based ***

                          3.1.1.4.         Screen Validation. When Aurora
                                  completes the development of a Collaborative
                                  Screen, ***

















PD.AURORA COLLABORATION AGREEMENT      13


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   17

                                  *** Upon approval of the report for the first
                                  Collaborative Screen to be developed by
                                  Aurora, Aurora will submit to PD an invoice
                                  for ***  Upon the approval of the report for
                                  the second Collaborative Screen to be
                                  developed by Aurora, Aurora will submit an
                                  invoice for ***  Upon the approval of *** to
                                  be developed by Aurora, Aurora will submit to
                                  PD an invoice for ***  All such invoices in
                                  this Section 3.1.1.4 are to be paid to Aurora
                                  within thirty days of the date of such
                                  invoice.

                          3.1.1.5.         Screening by Aurora.  For the first
                                  *** Collaborative Screens validated, pursuant
                                  to Section 3.1.1.4, and thereafter up to ***
                                  collaborative screens per calendar year,
                                  Aurora will testthe activity of at least ***
                                  provided by PD or chemicals agreed to by the
                                  parties pursuant to Section 3.1.1.6.  Aurora
                                  shall with regard to each such Collaborative
                                  Screen, screen Compounds in a manner
                                  determined by the CSP Steering Committee and
                                  provide retests of Compounds for putative
                                  Hits, and determination of crude IC50's as
                                  determined by the CSP Steering Committee (such
                                  screening by Aurora in each Collaborative
                                  Screen is referred to as an "Aurora Screening
                                  Program").

                          3.1.1.6.         Compound Supply.  PD shall ***
                                  supply Aurora Compounds selected by PD for an
                                  Aurora Screening Program.  In the event that
                                  PD desires to have Aurora test in an Aurora
                                  Screening Program a chemical (including a
                                  library of compounds) owned, accessed or
                                  Controlled by Aurora, the parties agree to
                                  negotiate in good faith the terms and
                                  conditions under which such compound may be
                                  screened.  Any chemical supplied by PD for
                                  use in an Aurora Screening Program will be
                                  provided in 96-well microtiter plates, in
                                  quantities, form and format as agreed by the
                                  CSP Steering Committee ("Compound Supply").
                                  Aurora agrees not to transfer the Compound
                                  Supply to any Third Party, attempt to analyze
                                  the Compound Supply for purposes of
                                  determining structure, or to use the Compound
                                  Supply for purposes not contemplated herein
                                  without PD's written consent.  Aurora will
                                  return or destroy such Compound Supply upon
                                  written notice by PD.

                          3.1.1.7.         Screening Payments. The CSP Steering
                                  Committee will *** Aurora Screening Program
                                  in accordance with Sections





PD.AURORA COLLABORATION AGREEMENT      14


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   18
                                  3.1.1.5 and 3.1.2. Such allocation shall be
                                  inclusive of all cost incurred by Aurora
                                  relating to labor, screening equipment, and
                                  supplies (other than compounds or reagents
                                  unique to a Collaborative Screen).  If Aurora
                                  determines that the expenses which would be
                                  incurred by Aurora with respect to any ***
                                  Aurora shall notify the CSP Steering
                                  Committee, and the CSP Steering Committee
                                  shall in good faith determine the amount of
                                  any additional funding to be allocated to
                                  Aurora by PD for the applicable Aurora
                                  Screening Program.



                 3.1.2.   Deployment of Collaborative Screen by PD.



                 For each Collaborative Screen not subject to an Aurora
                 Screening Program at Aurora, upon receipt of the payment made
                 by PD to Aurora pursuant to Section 3.1.1.4, Aurora will ship
                 the Collaborative Screen to PD.  For each such transferred
                 Collaborative Screen, PD will use reasonable efforts for ***
                 to employ such Collaborative Screen to screen Compounds, using
                 PD's then current screening practices.  If after ***, PD is
                 unable to successfully employ such Collaborative Screen ***

                 3.1.3.   Additional Screens.



                 Subject to the *** and Aurora's approval, such approval shall
                 not be unreasonably withheld, PD may elect to increase the
                 number of Collaborative Screens to *** following the Effective
                 Date.

                 3.1.4.   Payments to Aurora.



                 In addition to such payments as are made by PD to Aurora
                 pursuant to Section 3.1.1 and Section 3.1.2 hereof, the
                 following payments shall be made to Aurora:

                          3.1.4.1.         Milestones. PD will pay to Aurora:

                                  3.1.4.1.1.       ***





PD.AURORA COLLABORATION AGREEMENT      15


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   19
                                  3.1.4.1.2.       ***, that reaches the
                                             following milestones, PD will
                                             promptly notify Aurora of same and
                                             will pay the following amounts, to
                                             a bank account specified by
                                             Aurora, within thirty (30) days
                                             following such notification from
                                             PD.



                          Milestone
                           Event                      Payment    (US$)



                          i) ***                           ***



                          ii) ***                          ***



                          iii) ***                         ***



                                       ***

                          3.1.4.2.         Royalties.  With respect to *** a
                                  Collaborative Screen PD shall pay a royalty
                                  on *** as follows, the sum of the ***

3.2.   Access to the Aurora Reporter System Technology and Aurora Reporter
       System Patent Rights.



       PD's right to use ***, as set forth in the license in Section 5.1.3,
       requires that PD pay to Aurora an ***


       ***



















PD.AURORA COLLABORATION AGREEMENT      16


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   20

                 ***

         3.3.    Supply of Reporters. 


         So long as PD has made payments in accordance with Section 3.2 hereof,
         then, at PD's written request, *** Materials pertaining to *** PD will
         be charged for all supplies ***  PD will pay for all Materials so
         ordered within thirty (30) days after delivery to PD.

         3.4.    Ownership of Data.  


         All results and data concerning any Hits or Development Compounds
         generated by or for PD, or its Affiliates arising out of the use of
         the System, any Collaborative Screen, the use of any of the rights
         licensed under Section 5 hereof, or otherwise arising out of this
         Agreement shall be ***

         3.5.    Development of Products.


         PD will in its sole discretion determine which, if any, such Hit(s),
         or Derivative(s), will be approved as a Development Compound.  PD will
         be responsible for all pre-clinical and clinical development,
         including all regulatory filings, of Hits and Development Compounds
         arising out of this Agreement at no expense to Aurora.  PD shall have
         discretion and control over the conduct of all activities associated
         with the development or abandonment of any Development Compound, all
         regulatory activities relating to the manufacture, use or sale of any
         Development Compound or Product, and the commercialization and
         marketing of any Product in any country and ***  All regulatory
         filings made or filed by PD for any Development Compound or Product
         shall be owned solely by PD.  At PD's expense, Aurora shall cooperate
         to the extent reasonably necessary to permit PD to perform the
         foregoing activities.

         3.6.    Laboratory Facilities and Personnel. 


         Aurora and PD shall each, at their respective cost and expense,
         provide suitable and sufficient laboratory facilities and equipment,
         and will devote sufficient, experienced personnel, as is needed to
         carry out their respective obligations under this Agreement.















PD.AURORA COLLABORATION AGREEMENT      17


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   21
4.       SERVICE AND SUPPORT

         4.1.    Service and Support.



         For a period of *** Aurora will provide service and support for the
         System and all system components, ***  Service and support is more
         fully described on Exhibit 4.1 attached hereto ("Service and
         Support").  Aurora will be responsible for ***  Aurora will designate
         an appropriate Aurora employee to coordinate such Service and Support.



         Following ***, PD may elect to purchase Service and Support ***  This
         purchased annual Service and Support will be available to PD *** PD
         and Aurora will negotiate in good faith for further Service and
         Support.

5.       INTELLECTUAL PROPERTY RIGHTS

         5.1.    Grant of Rights from Aurora to PD.

                 5.1.1.   Intellectual Property Rights Related to the System.

                          Aurora grants to PD a ***  The grant of rights from
                          Aurora to PD does not include the right to sublicense
                          or the right to provide screening services ***  The
                          rights granted hereunder shall be subject to any and
                          all payments required under Article 2 hereof, and
                          shall continue until terminated in accordance with
                          this Agreement. The rights granted hereunder in
                          Section 5.1.1 shall be subject to any Third Party
                          obligations of Aurora, provided however, that (i) PD
                          is not obligated to pay further payments for Third
                          Party Patent Rights, copyrights and Technology coming
                          under the Control of Aurora after the Effective Date
                          from Third Parties unless PD desires to obtain rights
                          to such Patent Rights, Copyrights and Technology of
                          Third Parties ***

                 5.1.2.   Intellectual Property Rights Related to Collaborative
                          Screens.

                          Aurora, upon payment under Section 3.1.1.4,
                          *** Collaborative Screen, ***







PD.AURORA COLLABORATION AGREEMENT      18


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   22
                          *** The grant of rights from Aurora to PD does not
                          include the right to sublicense or the right to
                          provide screening services to ***  The rights granted
                          hereunder shall be subject to any and all payments
                          and royalties required under Article 3  hereof, and
                          shall continue until terminated in accordance with
                          this Agreement. The rights granted hereunder in
                          Section 5.1.2 shall be subject to any Third Party
                          obligations of Aurora, provided however, that (i) PD
                          is not obligated to pay further payments for Patent
                          Rights, Copyrights and Technology coming under the
                          Control of Aurora after the Effective Date from Third
                          Parties unless PD desires to obtain rights to such
                          Patent Rights, Copyrights and Technology of Third
                          Parties ***

                 5.1.3.   Intellectual Property Rights Related to Aurora
                          Reporters.

                          Aurora grants to PD ***  The grant of rights from
                          Aurora to PD does not include the right to sublicense
                          or to provide screening services ***  The rights
                          granted hereunder shall be subject to any and all
                          payments required under Article 3 hereof, and shall
                          continue until terminated in accordance with this
                          Agreement. The rights granted hereunder in Section
                          5.1.3 shall be subject to any Third Party obligations
                          of Aurora, provided however, that (i) PD is not
                          obligated to pay further payments for Patent Rights,
                          Copyrights and Technology coming under the Control of
                          Aurora after the Effective Date from Third Parties
                          unless PD desires to obtain rights to such Patent
                          Rights, Copyrights and Technology of Third Parties
                          ***

         5.2.    Grant of Rights from PD to Aurora.

                 PD grants to Aurora a non-exclusive, world-wide license,
                 without the right to sublicense, under PD Copyrights, PD
                 Patent Rights and PD Technology to the extent necessary for
                 Aurora to perform its obligations relating to a Collaborative
                 Screen. The rights granted hereunder shall continue until the
                 ***

         5.3.    Ownership of  Intellectual Property and Property

                 5.3.1.   Except as otherwise expressly provided in this
                          Agreement, nothing in this Agreement is intended to
                          convey or transfer ownership by one party to the
                          other of any rights, title or interest in any
                          Confidential Information, Technology, copyrights or
                          Patent Rights owned or Controlled by a party.  Except
                          as expressly provided for







PD.AURORA COLLABORATION AGREEMENT      19


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   23
                          in this Agreement, nothing in this Agreement shall be
                          construed as a license or sublicense by one party to
                          the other of any rights in any Technology,
                          copyrights, or Patent Rights owned or Controlled by a
                          party.

                 5.3.2.   PD shall own all Inventions and other Technology made
                          solely by its employees and agents, and all patent
                          applications and patents claiming such Inventions and
                          other Technology; provided, however, that if PD has a
                          license for Aurora Reporter Systems pursuant to
                          Sections 5.1.2 or 5.1.3, Aurora shall own such
                          Inventions and other Technology that consists of
                          improvements relating to an Aurora Reporter and PD
                          will assign the same to Aurora.  Aurora shall own
                          such Inventions and other Technology made solely by
                          its employees and agents, and all patent applications
                          and patents claiming such Inventions and other
                          Technology, provided, however, that PD will own all
                          Inventions and other Technology relating to PD's
                          Compounds and uses thereof conceived by Aurora in
                          performance of this Agreement and Aurora will assign
                          the same to PD.  PD and Aurora agree to execute all
                          documentation necessary to perfect such assignment.

                 5.3.3.   During the period from the Effective Date to ***
                          Inventions and other Technology conceived or made
                          jointly by employees or agents of PD and employees or
                          agents of Aurora shall be owned jointly by PD and
                          Aurora, provided however: 1) PD will own all such
                          Inventions and other Technology relating to PD's
                          therapeutic compounds and uses thereof conceived by
                          PD and Aurora in performance of this Agreement and
                          Aurora will assign the same to PD; and 2) Aurora
                          shall own such Inventions and other Technology
                          relating to Aurora Reporter or the System and PD will
                          assign the same to Aurora.  PD and Aurora agree to
                          execute all documentation necessary to perfect such
                          assignment.

                 5.3.4.   Inventorship of patentable Inventions shall be in
                          accordance with U.S. patent law.

6.       PAYMENTS OF ROYALTIES, ACCOUNTING FOR ROYALTIES AND RECORDS.

         6.1.    Payment and Reporting. 



         The royalties due under Article 3 and as follows in this Article 6,
         shall be paid within sixty (60) days after the end of each calendar
         quarter period in which such royalties are earned during the Royalty
         Term for each Product.  With each such quarterly payment, PD shall
         furnish Aurora a royalty statement setting forth on a
         country-by-country basis the relevant sales information, including the
         total number of units of each such Product and other information
         employed to calculate Net Sales for such Product.













PD.AURORA COLLABORATION AGREEMENT      20


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   24
         6.2.    Currency of Payment.

         All payments to be made under this Agreement, including the royalties
         payable to Aurora by PD, shall be paid in U.S. dollars by wire
         transfer or other mutually acceptable means to a bank account
         designated by the recipient.  Royalties earned shall be determined
         from the Net Sales in the currency of the country in which they are
         earned and then converted into dollars at the prevailing commercial
         rate of exchange for purchasing dollars with such foreign currency as
         quoted by the eastern edition of the Wall Street Journal at the close
         of business on the last business day of the calendar quarter for which
         the relevant royalty payment was earned.

         6.3.    Taxes Withheld.



         Any income or other tax that PD or any of its Affiliates, Licensees or
         Licensors is required by a government agency to withhold and pay on
         behalf of Aurora with respect to the royalties payable under this
         Agreement shall be deducted from and offset against said royalties
         prior to remittance to the recipient; provided, however, that in
         regard to any tax so deducted, PD shall give or cause to be given to
         Aurora such assistance as may reasonably be necessary to enable Aurora
         to claim exemption therefrom or credit therefor, and in each case
         shall furnish the recipient proper evidence of the taxes paid on
         Aurora's behalf.

         6.4.    Records.

                 6.4.1.   Net Sales and Royalty Calculations.



                 During the Royalty Term and for two (2) years from the date of
                 each payment of royalties, PD shall keep complete and accurate
                 records of sales and all other information necessary to
                 calculate Net Sales of each Product in sufficient detail to
                 allow the accrued royalties to be determined accurately in
                 accordance with GAAP.  Aurora, with reasonable written notice
                 to PD, shall have the right to cause Aurora's nationally
                 recognized independent, certified public accountant to audit
                 such records at the place or places of business where such
                 records are customarily kept in order to verify the accuracy
                 of the reports of Net Sales and royalty payments.  Such
                 accountant shall execute a confidentiality agreement prior to
                 entering PD's premises, obligating such accountant to keep all
                 information disclosed to it confidential and shall only be
                 permitted to disclose to Aurora the extent of any discrepancy
                 between royalty payments made by PD hereunder and the actual
                 royalty required to be so paid.  Aurora shall bear the full
                 cost of such audit unless such audit discloses a variance of
                 more than *** from the amount of the royalties due under this
                 Agreement, in which event, PD shall bear the full cost of such
                 audit. Aurora agrees not to disclose Confidential Information
                 concerning royalty payments and reports, and all information
                 learned in the course of any audit or inspection, except to
                 the extent necessary for Aurora to reveal such information in
                 order to enforce its rights under this Agreement or if
                 disclosure is required by law.









PD.AURORA COLLABORATION AGREEMENT      21


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   25
                 6.4.2.   Tracking Records for Collaborative Screens and the
                          System.

                          6.4.2.1.         The compounds, screens and targets
                                  tested using a Collaborative Screen or the
                                  fully integrated screening capabilities of
                                  the System will be recorded and stored by PD
                                  using its customary means and in a computer
                                  searchable database on a storage device. The
                                  information stored will include the target,
                                  screen type, the concentration, structure and
                                  activity of the compound tested, and date of
                                  testing.  Records of any Hits or any compound
                                  subject to additional screening will be
                                  stored by PD in a separate computer
                                  searchable data base.  Upon written request
                                  by Aurora, PD will create an annual written
                                  report of Hits or Derivatives subjected to
                                  additional screening, in vivo testing,
                                  computer modeling, medicinal chemistry or an
                                  Investigational New Drug application or
                                  foreign equivalent to date.  All the records
                                  described in this Section 6.4.2.1 are
                                  collectively referred to as tracking records
                                  (the "Tracking Records").  PD will permit a
                                  Third Party appointed by Aurora and subject
                                  to a confidential relationship with PD, to
                                  inspect the Tracking Records once per year or
                                  upon reasonable request for the sole purpose
                                  of determining the attainment of a milestone
                                  or royalty under Article 2 or 3.  The
                                  Tracking Records shall be securely retained
                                  for no less than *** from the last use of a
                                  Collaborative Screen or the System.

                          6.4.2.2.         Upon reasonable request by Aurora
                                  and at a minimum once per year, PD will
                                  provide Aurora with a summary of the status
                                  of Development Compounds and Products that
                                  may be used to calculate royalties or
                                  milestones.

         6.5.    Trade Secret Royalty.

                          *** PD agrees to pay those royalties and other
                          amounts during the Royalty Term at the applicable
                          rate specified under the Agreement, ***





PD.AURORA COLLABORATION AGREEMENT      22


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   26
         ***

7.       INTELLECTUAL PROPERTY ENFORCEMENT AND DEFENSE OF INFRINGEMENT CLAIMS

         7.1.    Intellectual Property Enforcement.



                 PD and Aurora shall have the right, but not the obligation, to
                 bring proceedings against any Third Party for the
                 inappropriate use, including patent infringement, of
                 Technology or Patent Rights solely owned or Controlled by it,
                 and at its own risk and expense.  Such party shall be entitled
                 to retain any and all awards or damages obtained in any such
                 proceeding.  At the request and expense of either party, the
                 other party shall give the requesting party all reasonable
                 assistance required to file and conduct any such proceeding.
                 For jointly owned Technology or Patent Rights, PD and Aurora
                 shall use their best efforts to coordinate pursuing a
                 commercially reasonable action to address inappropriate use,
                 including patent infringement, by Third Parties of such
                 Technology and Patent Rights and to determine how expenses and
                 any recovery from such action shall be allocated between the
                 parties.



                 PD will make reasonable efforts to provide Aurora with any
                 information known to PD relating to the suspected or actual
                 inappropriate use, including patent infringement, of Aurora
                 Technology and Aurora Patent Rights.

         7.2.    Defense of Infringement Claims Pertaining to PD Hits,
                 Development Compounds and Products.



                 Aurora will cooperate with PD, at PD's expense, in the defense
                 of any suit, action or proceeding against Aurora or PD and
                 PD's Affiliates alleging the infringement of the intellectual
                 property rights of a Third Party by reason of the manufacture,
                 use or sale of a Product by PD.  Each party shall give the
                 other party prompt written notice of the commencement of any
                 such suit, action, proceeding or claim of infringement. Aurora
                 shall give to PD all authority, information and assistance
                 necessary to defend or settle any such suit, action or
                 proceeding; provided, however, that if Aurora should join in
                 any such suit, action or proceeding pursuant to this Section
                 7.2 and at the request of PD, PD shall hold Aurora harmless
                 from any and all costs and expenses of such litigation,
                 including reasonable attorneys' fees, and Aurora shall execute
                 all documents, provide pertinent records, and take all other
                 actions, including requiring persons within its control to
                 give testimony, which may be reasonably required in connection
                 with the defense or settlement of such litigation.

         7.3.    Defense of Infringement Claims Pertaining to Aurora Technology
                 and Aurora Patent Rights.



                 PD will cooperate with Aurora, at Aurora's expense, in the
                 defense of any suit, action or proceeding against Aurora
                 alleging the infringement of the





PD.AURORA COLLABORATION AGREEMENT      23


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   27
                 intellectual property rights of a Third Party by reason of
                 Aurora's use of any Aurora Patent Rights and Aurora Technology
                 licensed to PD under this Agreement.  Aurora shall give PD
                 prompt written notice of the commencement of any such suit,
                 action, proceeding or claim of infringement.  PD shall give to
                 Aurora all authority, information and assistance necessary to
                 defend or settle any such suit, action or proceeding;
                 provided, however, that if PD should join in any such suit,
                 action or proceeding pursuant to this Section 7.3 and at the
                 request of Aurora, Aurora shall hold PD harmless from any and
                 all costs and expenses of such litigation, including
                 reasonable attorneys' fees, and PD shall execute all
                 documents, provide pertinent records, and take all other
                 actions, including requiring persons within its control to
                 give testimony, which may be reasonably required in connection
                 with the defense or settlement of such litigation.

8.       TREATMENT OF CONFIDENTIAL INFORMATION; PUBLICITY

         8.1.    Confidentiality.

                 8.1.1.   Subject to the terms and conditions of this
                          Agreement, PD and Aurora ***, it will keep
                          confidential, and will cause its Affiliates to keep
                          confidential, all Confidential Information that is
                          disclosed to it or to any of its Affiliates by the
                          other party in connection with the performance of
                          this Agreement.  Neither PD nor Aurora nor any of
                          their respective Affiliates shall use the other
                          party's Confidential Information except as expressly
                          permitted in this Agreement.

                 8.1.2.   PD and Aurora each agree that any disclosure of the
                          other's Confidential Information to any officer,
                          employee, contractor, consultant, sublicensee or
                          agent of the other party or of any of its Affiliates
                          shall be made only if and to the extent  necessary to
                          carry out its responsibilities under this Agreement
                          and to exercise the rights granted to it hereunder,
                          shall be limited to the extent consistent with such
                          responsibilities and rights, and shall be provided
                          only to such persons or entities who are bound to
                          maintain same in confidence in a like manner as the
                          party receiving same hereunder is so required.  Each
                          party shall use reasonable efforts to take such
                          action, and to cause its Affiliates to take such
                          action, to preserve the confidentiality of each
                          other's Confidential Information, which shall be the
                          same efforts as it would customarily take to preserve
                          the confidentiality of its own Confidential
                          Information.  PD's Confidential Information shall not
                          be disclosed, without PD's written consent, in a
                          patent application filed by Aurora or any Aurora
                          Affiliate.  Aurora's Confidential Information shall
                          not be disclosed, without Aurora's written consent,
                          in a patent application filed by PD or any PD
                          Affiliate.  Each party, upon the other's request,
                          will return all the Confidential Information received
                          from  the other party pursuant to this








PD.AURORA COLLABORATION AGREEMENT      24


*** CONFIDENTIAL TREATMENT REQUESTED
<PAGE>   28
                          Agreement, including all copies and extracts of
                          documents, within sixty (60) days of the request of
                          the other party following any termination of this
                          Agreement, except for one (1) copy which may be kept
                          for the purpose of ascertaining and complying with
                          continuing confidentiality obligations under this
                          Agreement.

                 8.1.3.   Confidential Information shall not include any
                          information which the receiving party can prove by
                          competent evidence:

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

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

                          iii)    is hereafter furnished to the receiving party
                          without restriction as to disclosure or use by a
                          Third Party lawfully entitled to so furnish same;

                          iv)     is independently developed by the employees,
                          agents or contractors of the receiving party without
                          the aid, application or use of the disclosing party's
                          Confidential Information; or

                          v)      is the subject of a written permission to
                          disclose provided by the disclosing party; or

                          vi)     is provided by the disclosing party to a
                          Third Party without restriction as to
                          confidentiality.

                          A party may also disclose Confidential Information of
                          the other where required to do so by law or legal
                          process, provided that, in such event, the party
                          required to so disclose shall give maximum practical
                          advance written notice of same to the other party and
                          will cooperate with the other party's efforts to
                          seek, at the request and expense of the other party,
                          all confidential treatment and protection for such
                          disclosure as is permitted by applicable law.

                          The parties agree that the material financial terms
                          of this Agreement will be considered Confidential
                          Information of both parties.  Notwithstanding the
                          foregoing, either party may disclose such terms in
                          legal proceedings or as are required to be disclosed
                          in its financial statements, by law, or under
                          strictures of confidentiality to bona fide potential
                          sublicensees.  Either party shall have the further
                          right to disclose the material financial terms of
                          this Agreement under strictures of confidentiality to
                          any potential acquirer, merger partner, bank, venture
                          capital firm, or other financial institution to
                          obtain financing.

                          The parties agree that information developed pursuant
                          to the development and use of a Collaborative Screen
                          will be considered Confidential Information of both
                          parties and shall be subject to the confidentiality
                          requirements of this Section 8.1.  Notwithstanding





PD.AURORA COLLABORATION AGREEMENT      25
<PAGE>   29
                          the foregoing, either party may disclose and use
                          information developed pursuant to the development and
                          use of a Collaborative Screen that is not specific to
                          a target selected by PDfor screen development and
                          screening under strictures of confidentiality to bona
                          fide sublicensees.

         8.2.    Publication of Results.



         Subject to Section 8.1 hereof, results and data obtained by either
         party in the course of a Collaborative Screen Program through use of
         an Aurora Reporter may be submitted for publication by PD in
         accordance with PD's customary practices, provided, however, that PD
         shall credit Aurora in such publication as the provider of the
         technology that produced, in part, the published results or data.  PD
         shall send a copy of the proposed publication and shall allow Aurora
         thirty (30) days from the date of receipt in which to determine
         whether such publication contains subject matter for which patent
         protection should be sought prior to disclosure, or otherwise contains
         Aurora Confidential Information.

         8.3.    Publicity.

         Except as required by law and as provided in this Article 8, neither
         party may make any public announcement or otherwise disclose the terms
         of this Agreement without the prior written consent of the other
         party, which consent shall not be unreasonably withheld.



9.       PATENT PROSECUTION AND COPYRIGHTS

         9.1.    Patents. 



         The control and expense of the filing, prosecution (including an
         opposition or interference) and maintenance of patents and patent
         applications claiming jointly owned Inventions will be equally shared
         by PD and Aurora.  Both Aurora and PD will use reasonable efforts to
         coordinate the filing prosecution and maintenance of patents and
         patent applications claiming jointly owned Inventions.  Should one
         party elect not to share in the control, filing, prosecution or
         maintenance of such patents or patent applications, the other party,
         upon thirty (30) days written notice, may elect to gain sole control
         of the filing, prosecution and  maintenance of such patents or patent
         applications and have sole responsibility for filing, prosecution or
         maintenance expenses.



         The control and expense of the filing, prosecution ***








PD.AURORA COLLABORATION AGREEMENT      26


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<PAGE>   30
         9.2.    Copyrights. 



         The parties agree to treat and handle, to the maximum practical
         extent, any copyrights owned or Controlled by a party in the same
         manner as Patent Rights owned or Controlled by such party.

10.      WARRANTIES AND INDEMNIFICATION

         10.1.   Mutual Representations and Warranties. 



         The parties make the following representations and warranties to each
other:



                 10.1.1.  Corporate Power.  Each party hereby represents and
                          warrants that such party (a) is duly organized and
                          validly existing under the laws of the state of its
                          incorporation and has full corporate power and
                          authority to enter into this Agreement and to carry
                          out the provisions hereof; (b) has the requisite
                          power and authority and the legal right to own and
                          operate its property and assets, to lease the
                          property and assets it operates under lease, and to
                          carry on its business as it is now being conducted;
                          and (c) is in compliance with all requirements of
                          applicable law, except to the extent that any
                          noncompliance would not have a material adverse
                          effect on the properties, business, financial or
                          other condition of it and would not materially
                          adversely affect its ability to perform its
                          obligations under the Agreement.

                 10.1.2.  Due Authorization.  Each party hereby represents and
                          warrants that such party (a) has the requisite power
                          and authority and the legal right to enter into the
                          Agreement and to perform its obligations hereunder;
                          and (b) has taken all necessary action on its part to
                          authorize the execution and delivery of the Agreement
                          and to authorize the performance of its obligations
                          hereunder and the grant of rights extended by it
                          hereunder.

                 10.1.3.  Binding Agreement.  Each party hereby represents and
                          warrants to the other that: (a) this Agreement has
                          been duly executed and delivered on its behalf and is
                          a legal and valid obligation binding upon it and is
                          enforceable in accordance with its terms; (b) the
                          execution, delivery and performance of this Agreement
                          by such party does not conflict with any agreement,
                          instrument or understanding, oral or written, to
                          which it is a party or by which it may be bound, nor
                          violate any law or regulation of any court,
                          governmental body or administrative or other agency
                          having authority over it; and (c) all necessary
                          consents, approvals and authorizations of all
                          governmental authorities and other persons required
                          to be obtained by it in connection with the Agreement
                          have been obtained.





PD.AURORA COLLABORATION AGREEMENT      27
<PAGE>   31
         10.2.   Warranties and Aurora Technology. 

         Aurora represents and warrants to PD as of the Effective Date the
following:

                 10.2.1.  To the best knowledge of Aurora Aurora has the lawful
                          right to license (or sublicense as the case maybe) to
                          PD in accordance with this Agreement Aurora Patent
                          Rights and Aurora Copyrights, including those Aurora
                          Patent Rights and Aurora Copyrights set forth in
                          Exhibit 5.1. To the best knowledge of Aurora Aurora
                          Patent Rights and Aurora Copyrights were properly
                          filed and prosecuted and no Third Party suit exists
                          relating to Aurora Patent Rights and Aurora
                          Copyrights.

                 10.2.2.  EXCEPT AS SET FORTH IN SECTION 10.2.1 ABOVE, AURORA
                          (INCLUDING ITS OFFICERS, EMPLOYEES AND AGENTS)
                          EXPRESSLY DISCLAIMS ANY REPRESENTATIONS AND
                          WARRANTIES, WHETHER EXPRESS OR IMPLIED, RELATING TO
                          AURORA PATENT RIGHTS, AURORA COPYRIGHTS AND AURORA
                          TECHNOLOGY.  AURORA FURTHER DISCLAIMS I) ANY EXPRESS
                          OR IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
                          A PARTICULAR PURPOSE OF ***

         10.3.   Aurora Indemnification.



         Aurora hereby agrees to indemnify, defend and hold PD, and its
         officers, directors, employees, and agents (collectively, the "PD
         Indemnitees") harmless from and against all damages or other amounts
         payable to a Third Party, including reasonable attorneys' fees and
         costs of litigation, resulting from a suit brought or threatened by a
         Third Party against a PD Indemnitee for *** misconduct relating to
         Aurora's performance under this Agreement, (b) Aurora's performance
         under this Agreement in the course of the Collaborative Screen Program
         at Aurora, (c) Aurora's intentional violation of any law, rule, or
         regulation (not including a law, rule or regulation relating to
         intellectual property) and (d) *** except to the extent such damages
         or other amounts payable are attributable to:  (i) a violation of law,
         regulation or court order by any PD Indemnitee, (ii) a violation of
         any contractual or fiduciary duty owed by any PD Indemnitee to a Third
         Party, (iii) the misappropriation by any such PD Indemnitee of the
         trade secrets of any Third Party, (iv) any negligent or wrongful act
         or omission of any PD Indemnitee, (v) PD's use of the System, (vi) any
         breach of this Agreement by a PD Indemnitee or misrepresentation
         contained herein, or (vii inappropriate use (including patent
         infringement) by Aurora of a target selected, or Compounds provided
         under this Agreement by PD that is owned or otherwise controlled by a
         Third Party or a Third Party's patent rights.  IN NO EVENT SHALL
         AURORA BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES SUFFERED
         BY PD RESULTING FROM





PD.AURORA COLLABORATION AGREEMENT      28


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         THE EXERCISE OF ANY RIGHTS GRANTED IN ACCORDANCE WITH THIS AGREEMENT.



         10.4.   Warranties and PD Technology.



         PD warrants to Aurora as of the Effective Date the following:

                 10.4.1.  To the best knowledge of PD as of the Effective Date,
                          PD has the lawful right to license to Aurora in
                          accordance with this Agreement PD Patent Rights and
                          PD Copyrights. To the best knowledge of PD as of the
                          Effective Date, PD Patent Rights and PD Copyrights
                          were properly filed and prosecuted and no Third Party
                          suit exists relating to PD Patent Rights, and PD
                          Copyrights.

                 10.4.2.  EXCEPT AS SET FORTH IN SECTION 10.4.1 ABOVE, PD
                          (INCLUDING ITS OFFICERS, EMPLOYEES AND AGENTS)
                          EXPRESSLY DISCLAIM ANY REPRESENTATIONS AND
                          WARRANTIES, WHETHER EXPRESS OR IMPLIED, RELATING TO
                          PD PATENT RIGHTS, PD COPYRIGHTS AND PD TECHNOLOGY.
                          PD FURTHER DISCLAIMS: I) ANY EXPRESS OR IMPLIED
                          WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
                          PARTICULAR PURPOSEOF PD TECHNOLOGY OR PD PATENT
                          RIGHTS; II) PRACTICE OF PD COPYRIGHTS, PD TECHNOLOGY
                          OR PD PATENT RIGHTS WILL NOT INFRINGE A PATENT,
                          COPYRIGHT, TRADEMARK OR OTHER RIGHT OF A THIRD PARTY;
                          AND III)  THE PATENTABILITY OF ANY PD TECHNOLOGY,
                          INCLUDING PD TECHNOLOGY CLAIMED IN PATENT
                          APPLICATIONS AS PART OF PD PATENT RIGHTS.

         10.5.   PD Indemnification.



                 PD hereby agrees to indemnify, defend and hold Aurora, and its
                 respective officers, directors, employees, and agents
                 (collectively, the "Aurora Indemnitees") harmless from and
                 against all damages or other amounts payable to a Third Party,
                 including reasonable attorneys' fees and costs of litigation,
                 resulting from a suit or other threat brought or threatened by
                 a Third Party against a Aurora Indemnitee for i) any
                 development, manufacture, use or sale of a Development
                 Compound or Product by or through PD or its Affiliates or its
                 Licensees or Licensors, ii) infringement of a Third Party
                 patent claim by PD or its Affiliates or its Licensees or
                 Licensors, and iii) infringement by Aurora of Patent Rights
                 owned or controlled by a Third Party for a target proposed by
                 PD for a Collaborative Screen, or Compounds provided under
                 this Agreement by PD; except to the extent such damages or
                 other amounts payable are attributable to:  (i) a violation of
                 law, regulation or court order by any Aurora Indemnitee, (ii)
                 a violation of any contractual or fiduciary duty owed by any
                 Aurora Indemnitee to a Third Party, (iii) ***  IN NO EVENT
                 SHALL PD BE LIABLE FOR ANY INCIDENTAL OR





PD.AURORA COLLABORATION AGREEMENT      29


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<PAGE>   33
                 CONSEQUENTIAL DAMAGES SUFFERED BY AURORA RESULTING FROM THE
                 EXERCISE OF ANY RIGHTS GRANTED IN ACCORDANCE WITH THIS
                 AGREEMENT.





11.      TERM, PARTIAL PERFORMANCE AND TERMINATION

         11.1.   Term. 



         The term of this Agreement will begin on the Effective Date and shall
         continue until there is no longer a royalty obligation owed by PD to
         Aurora unless terminated earlier in accordance with the provisions of
         Sections 11.2-11.4 hereof.

         11.2.   Termination By Mutual Agreement.

         The parties may at any time terminate this Agreement, in whole or in
         part, by written agreement executed by both Aurora and PD.  In such
         event, the document effecting such termination shall specify the
         continuation or termination of any license rights granted hereunder,
         as well as any other terms agreed to by both parties.

         11.3.   Termination Without Cause by PD.



         PD may elect to terminate this Agreement for any reason without cause,
         provided, however, that PD provide Aurora with written notice ***  In
         the event of such termination without cause by PD, the following shall
         occur:

                 11.3.1.  PD shall pay to Aurora *** payments as are necessary
                          so that PD *** under Section 2.1.4.5.

                 11.3.2.  PD shall either: ***

                 11.3.3.  All licenses and sublicenses granted in accordance
                          with this Agreement shall be terminated and all
                          Materials transferred in accordance with this
                          Agreement shall be returned to Aurora or destroyed at
                          the discretion of Aurora by PD ***














PD.AURORA COLLABORATION AGREEMENT      30


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                 *** PD will remain obligated to pay ***

                 11.3.4.  All payments by PD required in accordance with this
                          Agreement from the date of receipt by Aurora of
                          written notice of such termination by PD shall be
                          paid by PD within thirty (30) days of such notice to
                          Aurora; provided, however, that the quarterly
                          payments under Section 11.3.1 may be made quarterly.
                          ***, if such delivery is requested by PD within
                          fifteen (15) days of such termination.  Further, upon
                          such termination all of Aurora's obligations under
                          the Agreement will be satisfied.



         11.4.   Partial Performance.



         PD and Aurora agree that Aurora may, under certain circumstances,
         partially perform under this Agreement, without PD terminating the
         Agreement, as set forth below:

                 11.4.1.  ***

         11.5.   Termination for Cause.



         Either party shall have the right to terminate this Agreement at any
         time for a material breach of this Agreement by the other party,
         provided that the non-breaching party shall have given the breaching
         party (90) days written notice of the breach and intention to
         terminate this Agreement in the absence of a cure within ninety (90)
         days of receipt of such notice by the beaching party.  Upon
         termination of this Agreement for cause, all licenses and sublicenses
         granted in accordance with this Agreement shall be terminated and all
         Materials transferred





PD.AURORA COLLABORATION AGREEMENT      31


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<PAGE>   35
         in accordance with this Agreement shall be returned to the supplying
         party or destroyed at the discretion of such party ***  The non-
         breaching party, upon termination of this Agreement may seek actual or
         general damages and remedies available to it at law or in equity.

         11.6.   Effect of Bankruptcy. 



         If a party becomes insolvent or admits in writing its inability to pay
         its debts as they mature or applies for or consents to the appointment
         of a receiver or trustee for any of its properties; or a receiver or
         trustee is appointed for such party or a substantial portion of its
         properties and is not discharged within ninety (90) days; or any
         bankruptcy, reorganization, debt arrangement, dissolution, liquidation
         or other proceeding under any bankruptcy or insolvency law is
         instituted by or against such party and, if instituted against such
         party, it is consented to by such party or remains undismissed for
         ninety (90) days, then

                 11.6.1.  Notwithstanding any such event, such party shall
                          remain obligated to fulfill its obligations and
                          covenants hereunder, and any failure to do so or
                          other breach hereunder shall entitle the other party
                          to terminate this Agreement in accordance with
                          Section 11.2 hereof; and



                 11.6.2.  It is the parties desire that, if any such receiver,
                          trustee, judge, arbitrator or other adjudicator
                          conducting or controlling such proceedings on behalf
                          of a party should hold that any obligations,
                          covenants or duties of such party hereunder should be
                          suspended or declared unenforceable, in whole or in
                          part, then the rights and benefits granted to the
                          other party hereunder shall remain in full force and
                          effect, and that any such obligations, covenants or
                          duties shall be reformed by such receiver, trustee,
                          judge, arbitrator or other adjudicator so as to be
                          enforceable to the maximum extent permitted by
                          applicable law and to permit any suspension to be
                          lifted at the earliest practicable time.



         11.7.   Effect of Expiration or Termination.



         The obligations and rights of the parties under Sections 2.1.5, 3.1.4
         through 3.2, 5.3, 10.2, 10.3, 10.4, 10.5, 11.3.2 (if applicable),
         11.7, Articles 6, 8, 9, and 13, thereof, as well as any provisions,
         which, by their intent or meaning are intended to so survive, shall
         survive termination or expiration of this Agreement.  Except as
         otherwise expressly provided in this Agreement, the rights and
         obligations of the parties under Sections 5.1, and 5.2 hereof shall
         terminate and be of no further force or effect whatsoever upon any
         termination of this Agreement.





PD.AURORA COLLABORATION AGREEMENT      32


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12.      MISCELLANEOUS

         12.1.   Assignment.



         Notwithstanding any provision of this Agreement to the contrary ***



         Either party may also assign its rights or obligations under this
         Agreement in connection with the sale of all or substantially all of
         its assets, or may otherwise assign its rights or obligations under
         this Agreement with the prior written consent of the other party.
         This Agreement shall survive any merger or consolidation of either
         party with or into another party and no consent for any such merger,
         consolidation or similar reorganization shall be required hereunder;
         provided, that in the event of such merger, consolidation or similar
         reorganization or in the event of a sale of all assets, the party
         participating in such merger, consolidation or similar reorganization
         is obligated to provide consideration to the non-participating party
         for the transfer of the intellectual property rights, Technology and
         Deliverables licensed and accessed under this Agreement for twice the
         total consideration under this Agreement for such intellectual
         property rights, Technology and Deliverables licensed and accessed;
         further provided, that in the event of such merger, consolidation or
         similar reorganization or in the event of a sale of all assets, no
         intellectual property rights of the acquiring or acquired company
         shall be included in the technology licensed hereunder.

         12.2.   Binding Effect.



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



         12.3.   Force Majeure.



         Neither party shall lose any rights hereunder or be liable to the
         other party for damages or losses on account of failure of performance
         by the defaulting party if the failure is occasioned by war, fire,
         explosion, flood, earthquake, strike, lockout, embargo, act of God, or
         any other similar cause beyond the control of the defaulting party,
         provided that the party claiming force majeure has exerted all
         reasonable efforts to avoid or remedy such force majeure and
         thereafter takes all reasonable steps to mitigate any such delay in
         performance hereunder and any damages that may be incurred by the
         other party thereby.

         12.4.   Notices.



         Any notices or communications provided for in this Agreement to be
         made by either of the parties to the other shall be in writing, in
         English, and shall be made





PD.AURORA COLLABORATION AGREEMENT      33


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<PAGE>   37
         by prepaid air mail or overnight carrier with return receipt addressed
         to the other at its address set forth below.  Any such notice or
         communication may also be given by hand, or facsimile to the
         appropriate designation.  Notices shall be sent:

         If to PD, to:            Warner-Lambert Company
                                  2800 Plymouth Road
                                  Ann Arbor, Michigan, 48105

         Facsimile number:        (313) 996-1553

         Attention:               Dr. Ronald Cresswell
                                  Vice President and Chairman
                                  Parke-Davis Research Division

         Copy:                    General Counsel
                                  Warner-Lambert Company

         If to Aurora, to:        Aurora Biosciences Corporation
                                  11149 N. Torrey Pines Road
                                  La Jolla, CA 92037

         Facsimile number:        (619) 452-5723

         Attention:               Timothy J. Rink, M.D., Sc.D.
                                  Chairman, CEO, and President

         Copy:                    Paul Grayson
                                  Vice President, Corporate Development

         provided that if such notice or communication relates to an amendment
         to this Agreement or to any notice pursuant to Article 11 hereof, a
         copy shall also be sent to:

         If to PD, to:            Susan C. Moniot
                                  Director of Corporate Development and
                                  Licensing
                                  Warner-Lambert Company
                                  201 Tabor Road
                                  Moris Plains, New Jersey

         If to Aurora, to:        Dr. John Mendlein
                                  Senior Legal Counsel
                                  Aurora Biosciences Corporation
                                  11149 Torrey Pines Road
                                  La Jolla, California, 92037



         Either party may by like notice specify or change an address to which
         notices and communications shall thereafter be sent.  Notices sent by
         mail, facsimile or cable shall be effective upon receipt and notices
         given by hand shall be effective when delivered.

         12.5.   Governing Law and Jurisdiction.  


         This Agreement shall be governed by the laws of the State of
         California, as such laws are applied to contracts entered into and to
         be performed within such state.





PD.AURORA COLLABORATION AGREEMENT      34
<PAGE>   38
         Any dispute arising from this Agreement, including litigation and
         non-binding arbitration, shall be resolved in San Diego, California.

         12.6.   Waiver.

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

         12.7.   Severability.

         If any term, covenant or condition of this Agreement or the
         application thereof to any party or circumstance shall, to any extent,
         be held to be invalid or unenforceable, then the remainder of this
         Agreement, or the application of such term, covenant or condition to
         parties or circumstances other than those as to which it is held
         invalid or unenforceable, shall not be affected thereby and each term,
         covenant or condition of this Agreement shall be valid and be enforced
         to the fullest extent permitted by law; and the parties hereto
         covenant and agree to renegotiate any such term, covenant or
         application thereof in good faith in order to provide a reasonably
         acceptable alternative to the term, covenant or condition of this
         Agreement or the application thereof that is invalid or unenforceable,
         it being the intent of the parties that the basic purposes of this
         Agreement are to effectuated.

         12.8.   Independent Contractors.

         It is expressly agreed that Aurora and PD shall be independent
         contractors and that the relationship between the two parties shall
         not constitute a partnership or agency of any kind.  Neither Aurora
         nor PD shall have the authority to make any statements,
         representations or commitments of any kind, or to take any action,
         which shall be binding on the other, without the prior written
         authorization of the other party to do so.

         12.9.   Counterparts. 

         This Agreement may be executed in two (2) or more counterparts, each
         of which shall be deemed an original, but all of which together shall
         constitute one and the same instrument.

         12.10.  Entire Agreement.

         This Agreement between the parties of even date herewith set forth all
         of the covenants, promises, agreements, warranties, representations,
         conditions and understandings between the parties hereto, and
         supersedes and terminates all prior agreements and understanding
         between the parties, with respect to the subject matter hereof.  There
         are no covenants, promises, agreements, warranties, representations
         conditions or understandings, either oral or written, between the
         parties other than as set forth herein and therein.  No subsequent
         alteration, amendment, change or addition to this Agreement shall be
         binding upon the parties hereto unless reduced to writing and signed
         by the respective authorized





PD.AURORA COLLABORATION AGREEMENT      35
<PAGE>   39
         officers of the parties.  This Agreement shall not be strictly
         construed against either party hereto.  Any conflict between the terms
         set forth in the text of this Agreement and the terms of any Exhibit
         hereto shall be resolved in favor of the text of this Agreement.

         12.11.  No Third Party Beneficiaries.



         No third party, including any employee of any party this Agreement,
         shall have or acquire any rights by reason of this Agreement.  Nothing
         contained in this Agreement shall be deemed to constitute the parties
         partners with each other or any third party.

         12.12.  Construction. 



         The term "Section" can refer to any single paragraph level found
         herein or any collection of multiple paragraphs thereunder.

         12.13.  Dispute Resolution.  



         The parties recognize that disputes as to certain matters may from
         time to time arise during the term of this Agreement which relate to
         either party's rights and/or obligations hereunder.  It is the
         objective of the parties to establish procedures to

         facilitate the resolution of disputes arising under this Agreement in
         an expedient manner by mutual cooperation and without resort to
         litigation or arbitration.  The parties agree that prior to any
         litigation or arbitration concerning this Agreement, PD's president
         and Aurora's president will meet in person or by video-conferencing in
         a good faith effort to resolve any disputes concerning this Agreement.



         IN WITNESS WHEREOF, the parties have caused this Agreement to be
         executed by their duly authorized representatives.





WARNER-LAMBERT COMPANY                  AURORA BIOSCIENCES CORPORATION



By:  /s/ Anthony Wild                   By:  /s/ Timothy J. Rink
      ---------------------------             -----------------------------


Name:  Anthony Wild Ph.D.               Name:  Dr. Timothy J. Rink
      ---------------------------             -----------------------------


Title:  President, Pharma Sector        Title:  President, CEO and Chairman
      ---------------------------             -----------------------------



Date:  September 22, 1997               Date:  8/19/1997
      ---------------------------             -----------------------------





PD.AURORA COLLABORATION AGREEMENT      36
<PAGE>   40

                                LIST OF EXHIBITS





EXHIBIT 1.1:     PERFORMANCE SPECIFICATIONS



EXHIBIT 1.2:     EXHIBIT OF REPORTERS



EXHIBIT 4.1:     SERVICE AND SUPPORT



EXHIBIT 5.1:     LIST OF AURORA REPORTER SYSTEM PATENT RIGHTS


























PD.AURORA COLLABORATION AGREEMENT      37
<PAGE>   41
                              EXHIBIT 1.1 - PAGE 1


                           PERFORMANCE SPECIFICATIONS


***
























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                              EXHIBIT 1.1 - PAGE 2


                           PERFORMANCE SPECIFICATIONS



                                    MODULE 2


***
































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                              EXHIBIT 1.1 - PAGE 3



                           PERFORMANCE SPECIFICATIONS



                                    MODULE 2



***

























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                              EXHIBIT 1.1 - PAGE 4



                           PERFORMANCE SPECIFICATIONS



***





























PD.AURORA COLLABORATION AGREEMENT      41


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                                  EXHIBIT 1.2



                            DESCRIPTION OF REPORTERS



***


































PD.AURORA COLLABORATION AGREEMENT      42


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                                  EXHIBIT 4.1



                              SERVICE AND SUPPORT



         The following terms and conditions shall apply to the Service and
Support provided by Aurora to PD pursuant to Section 4.1 of the Collaborative
Research and License Agreement.  ***


























PD.AURORA COLLABORATION AGREEMENT      43


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                                  EXHIBIT 5.1

                  LIST OF AURORA REPORTER SYSTEM PATENT RIGHTS


             TITLE                                                SERIAL NUMBER


                                      ***





























PD.AURORA COLLABORATION AGREEMENT      44


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<PAGE>   1
                                                                    EXHIBIT 11.1



                         AURORA BIOSCIENCES CORPORATION
                                  EXHIBIT 11.1
             STATEMENT RE COMPUTATION OF NET INCOME (LOSS) PER SHARE



<TABLE>
<CAPTION>
                                                 Three months ended                    Nine months ended
                                                     September 30,                        September 30,
                                             ------------------------------       -------------------------------
                                                 1997              1996               1997               1996
                                             ------------      ------------       ------------       ------------
<S>                                          <C>               <C>                <C>                <C>          
Net income (loss)                            $    896,759      $ (1,673,193)      $ (1,547,415)      $ (2,841,052)

Computation of common and common
  equivalent shares outstanding:
   Weighted average common shares
      outstanding                              17,002,007         2,288,190          4,472,501          1,754,031
   Net effect of dilutive stock options
      based on the treasury stock
      method using average market price           574,494                --                 --                 --
   Convertible preferred stock assuming
      conversion from date of issuance                 --         9,457,947          9,915,973          6,924,588
                                              -----------       -----------       ------------       ------------
                                               17,576,501        11,746,137         14,388,474          8,678,619
                                              -----------       -----------       ------------       ------------ 
    
Shares related to SAB 83 based on the
  treasury stock method:  
   Common stock                                        --           630,319              6,168            845,823
   Convertible preferred stock                         --           251,914                 --            634,700
   Warrants (1)                                        --            45,290             45,290             45,290
   Common stock options granted (1)                    --           507,159            311,256            507,159
                                             ------------      ------------       ------------       ------------
                                                       --         1,434,682            362,714          2,032,972
                                             ------------      ------------       ------------       ------------
Shares used in computing
  net income (loss) per share                  17,576,501        13,180,819         14,751,188         10,711,591
                                             ============      ============       ============       ============

Net income (loss) per share                  $       0.05      $      (0.13)      $      (0.10)      $      (0.27)
                                             ============      ============       ============       ============
</TABLE>


(1)  All warrants and common stock options granted between March 14, 1996 and
     March 31, 1997 are included in this calculation as SAB 83 shares for the
     applicable periods.


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT SEPTEMBER 30, 1997 (UNAUDITED) AND THE STATEMENT OF OPERATIONS FOR THE
NINE MONTHS ENDED SEPTEMBER 30, 1997 (UNAUDITED) AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FORM 10-Q FOR THE QUARTERLY PERIOD ENDED SEPTEMBER
30, 1997.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                      29,346,325
<SECURITIES>                                16,255,344
<RECEIVABLES>                                2,615,694
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            51,744,737
<PP&E>                                       4,569,448
<DEPRECIATION>                                 775,660
<TOTAL-ASSETS>                              56,857,139
<CURRENT-LIABILITIES>                        2,322,112
<BONDS>                                              0
                                0
                                          0
<COMMON>                                        17,018
<OTHER-SE>                                  52,224,320
<TOTAL-LIABILITY-AND-EQUITY>                56,857,139
<SALES>                                              0
<TOTAL-REVENUES>                             7,584,963
<CGS>                                                0
<TOTAL-COSTS>                                4,637,452
<OTHER-EXPENSES>                             5,356,732
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             236,374
<INCOME-PRETAX>                            (1,547,415)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (1,547,415)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (1,547,415)
<EPS-PRIMARY>                                   (0.10)
<EPS-DILUTED>                                   (0.10)
        

</TABLE>


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