MOLECULAR DEVICES CORP
S-4/A, 2000-07-17
LABORATORY ANALYTICAL INSTRUMENTS
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<PAGE>   1


     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 17, 2000



                                                      REGISTRATION NO. 333-40464

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

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


                                AMENDMENT NO. 1


                                       TO


                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                         MOLECULAR DEVICES CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                             <C>                             <C>
           DELAWARE                         0-27316                       94-2914362
(STATE OR OTHER JURISDICTION OF  (PRIMARY STANDARD INDUSTRIAL          (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)    CLASSIFICATION CODE NUMBER)       IDENTIFICATION NUMBER)
</TABLE>

                               1311 ORLEANS DRIVE
                              SUNNYVALE, CA 94089
                                 (408) 747-1700
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

                             JOSEPH D. KEEGAN, PH.D
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                         MOLECULAR DEVICES CORPORATION
                               1311 ORLEANS DRIVE
                              SUNNYVALE, CA 94089
                                 (408) 747-1700
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)

                                   COPIES TO:

<TABLE>
<S>                                            <C>
             JAMES C. KITCH, ESQ.                        STEVEN J. TONSFELDT, ESQ.
        SUZANNE SAWOCHKA HOOPER, ESQ.                       MARK B. WEEKS, ESQ.
              COOLEY GODWARD LLP                             VENTURE LAW GROUP,
            FIVE PALO ALTO SQUARE                        A PROFESSIONAL CORPORATION
             3000 EL CAMINO REAL                            2800 SAND HILL ROAD
           PALO ALTO, CA 94306-2155                     MENLO PARK, CALIFORNIA 94025
                (650) 843-5000                                 (650) 854-4488
</TABLE>


     APPROXIMATE DATE OF PROPOSED SALE TO THE PUBLIC: As soon as practicable
following the effectiveness of this Registration Statement and satisfaction or
waiver of all other conditions to the proposed merger.


     If the only securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  [ ]

     If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  [ ]

     If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier
registration statement for the same offering.  [ ]

     If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier registration statement for the same
offering.  [ ]

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>   2

[MOLECULAR DEVICES LOGO][LGL BIOSYSTEMS LOGO]

                        SPECIAL MEETINGS OF STOCKHOLDERS

                 MERGER PROPOSED -- YOUR VOTE IS VERY IMPORTANT

     The boards of directors of Molecular Devices Corporation and LJL
BioSystems, Inc. have unanimously approved a merger combining Molecular Devices
and LJL BioSystems.


     If the merger is completed, holders of LJL BioSystems common stock will
receive 0.30 of a share of Molecular Devices common stock for each share of LJL
BioSystems common stock they own. This is a fixed exchange ratio that will not
be adjusted for changes in the stock price of either company before the merger
is completed. Immediately after the merger, based on the number of shares
outstanding on June 30, 2000, former stockholders of LJL BioSystems will own
approximately 28% of the outstanding shares of Molecular Devices common stock,
and persons who were stockholders of Molecular Devices immediately before the
merger will own approximately 72% of the outstanding shares of Molecular Devices
common stock.


     The Molecular Devices common stock is listed on the Nasdaq National Market
under the symbol "MDCC."

     Stockholders of Molecular Devices will be asked, at Molecular Devices'
special meeting of stockholders, to approve the issuance of shares of Molecular
Devices common stock to the stockholders of LJL BioSystems in the merger. The
board of directors of Molecular Devices has determined that the issuance of
shares of Molecular Devices common stock to the stockholders of LJL BioSystems
is in the best interests of Molecular Devices stockholders and recommends that
Molecular Devices stockholders vote in favor of such issuance.

     Stockholders of LJL BioSystems will be asked, at LJL BioSystems' special
meeting of stockholders, to adopt the merger agreement. The board of directors
of LJL BioSystems has determined that the merger and the merger agreement are in
the best interests of LJL BioSystems stockholders and has declared advisable and
recommends that LJL BioSystems stockholders adopt the merger agreement.

     The dates, times and places of the special meetings are as follows:


<TABLE>
    <S>                                          <C>
    For Molecular Devices stockholders:          For LJL BioSystems stockholders:
    Wednesday, August 30, 2000                   Wednesday, August 30, 2000
    10:30 a.m., local time                       9:00 a.m., local time
    Molecular Devices Corporation                LJL BioSystems, Inc.
    1311 Orleans Drive                           405 Tasman Drive
    Sunnyvale, CA 94089                          Sunnyvale, CA 94089
</TABLE>


     The joint proxy statement/prospectus attached to this letter provides you
with information about Molecular Devices, LJL BioSystems and the proposed
merger. In addition, you may obtain other information about Molecular Devices
and LJL BioSystems from documents filed with the Securities and Exchange
Commission. We encourage you to read the entire joint proxy statement/prospectus
carefully.
<PAGE>   3

     YOUR VOTE IS VERY IMPORTANT. WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL
MEETINGS, IF YOU ARE A HOLDER OF MOLECULAR DEVICES OR LJL BIOSYSTEMS COMMON
STOCK PLEASE TAKE THE TIME TO VOTE BY COMPLETING AND MAILING THE ENCLOSED PROXY
CARD TO US.


<TABLE>
<S>                                            <C>

/s/ JOSEPH D. KEEGAN                           /s/ LEV J. LEYTES
Joseph D. Keegan, Ph.D                         Lev J. Leytes
President, Chief Executive Officer and
  Director                                     President, Chief Executive Officer and
Molecular Devices Corporation                  Chairman of the Board
                                               LJL BioSystems, Inc.
</TABLE>


     FOR A DISCUSSION OF SIGNIFICANT MATTERS THAT SHOULD BE CONSIDERED BEFORE
VOTING AT THE SPECIAL MEETINGS, SEE "RISK FACTORS" BEGINNING ON PAGE 16.

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
REGULATORS HAVE APPROVED NOR DISAPPROVED THE MOLECULAR DEVICES COMMON STOCK TO
BE ISSUED IN THE MERGER OR DETERMINED WHETHER THE JOINT PROXY
STATEMENT/PROSPECTUS IS ACCURATE OR ADEQUATE. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.


     The joint proxy statement/prospectus is dated July   , 2000, and is first
being mailed to stockholders of Molecular Devices and stockholders of LJL
BioSystems on or about July 20, 2000.


     THE JOINT PROXY STATEMENT/PROSPECTUS IS NOT AN OFFER TO SELL THESE
SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY
STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.
<PAGE>   4

[Inside Front Cover]

     The joint proxy statement/prospectus incorporates important business and
financial information about Molecular Devices and LJL BioSystems that is not
included in or delivered with this document. This information is available
without charge to Molecular Devices stockholders and LJL BioSystems stockholders
upon written or oral request. Stockholders should contact Molecular Devices at
1311 Orleans Drive, Sunnyvale, California 94089, Attn: Investor Relations, (408)
747-1700 or LJL BioSystems at 405 Tasman Drive, Sunnyvale, California 94089,
Attn: Investor Relations, (408) 548-0542.


     To obtain timely delivery of requested documents before the special
meetings, you must request them no later than August 23, 2000, which is five
business days before the date of the special meetings.


     Also see "Where You Can Find More Information" in the joint proxy
statement/prospectus.
<PAGE>   5

                         MOLECULAR DEVICES CORPORATION
                               1311 ORLEANS DRIVE
                          SUNNYVALE, CALIFORNIA 94089
                                 (408) 741-1700
                            ------------------------

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

                         TO BE HELD ON AUGUST 30, 2000


To the stockholders of Molecular Devices Corporation:


     A special meeting of stockholders of Molecular Devices Corporation, a
Delaware corporation, will be held on Wednesday, August 30, 2000 at 10:30 a.m.,
local time, at the principal executive offices of Molecular Devices located at
1311 Orleans Drive, Sunnyvale, California, for the following purposes:


     1. To consider and vote upon the issuance of shares of Molecular Devices
        common stock in the merger contemplated by the Agreement and Plan of
        Merger and Reorganization, dated as of June 7, 2000, among Molecular
        Devices Corporation, Mercury Acquisition Sub, Inc., a Delaware
        corporation and a wholly owned subsidiary of Molecular Devices, and LJL
        BioSystems, Inc.; and

     2. To transact such other business as may properly come before the special
        meeting or any adjournment or postponement thereof.


     The board of directors of Molecular Devices has fixed the close of business
on July 14, 2000 as the record date for the determination of stockholders
entitled to notice of, and to vote at, the special meeting and any adjournment
or postponement thereof. Only holders of record of shares of Molecular Devices
common stock at the close of business on the record date are entitled to notice
of, and to vote at, the special meeting. At the close of business on the record
date, Molecular Devices had outstanding and entitled to vote 11,508,585 shares
of common stock. Holders of Molecular Devices common stock are not entitled to
dissenters' rights under the Delaware General Corporation Law.


     YOUR VOTE IS IMPORTANT. THE AFFIRMATIVE VOTE OF THE HOLDERS OF A MAJORITY
OF THE VOTES CAST IS REQUIRED FOR APPROVAL OF THE ISSUANCE OF THE MOLECULAR
DEVICES SHARES IN THE MERGER. EVEN IF YOU PLAN TO ATTEND THE SPECIAL MEETING IN
PERSON, WE REQUEST THAT YOU SIGN AND RETURN THE ENCLOSED PROXY AND THUS ENSURE
THAT YOUR SHARES WILL BE REPRESENTED AT THE SPECIAL MEETING IF YOU ARE UNABLE TO
ATTEND. IF YOU SIGN, DATE AND MAIL YOUR PROXY CARD WITHOUT INDICATING HOW YOU
WISH TO VOTE, YOUR PROXY WILL BE COUNTED AS A VOTE IN FAVOR OF THE ISSUANCE OF
SHARES OF MOLECULAR DEVICES COMMON STOCK IN THE MERGER. IF YOU FAIL TO RETURN
YOUR MOLECULAR DEVICES PROXY CARD, THE EFFECT WILL BE THAT YOUR SHARES WILL NOT
BE COUNTED FOR PURPOSES OF DETERMINING WHETHER A QUORUM IS PRESENT AT THE
MOLECULAR DEVICES SPECIAL MEETING. IF YOU DO ATTEND THE SPECIAL MEETING AND WISH
TO VOTE IN PERSON, YOU MAY WITHDRAW YOUR PROXY AND VOTE IN PERSON.

                                          By Order of the Board of Directors,


                                          /s/ JOSEPH D. KEEGAN

Sunnyvale, California                     Joseph D. Keegan, Ph.D

July 20, 2000                             President, Chief Executive Officer and
                                          Director


     MOLECULAR DEVICES' BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT MOLECULAR
DEVICES STOCKHOLDERS VOTE "FOR" THE ISSUANCE OF SHARES OF MOLECULAR DEVICES
COMMON STOCK IN THE MERGER.
<PAGE>   6

                              LJL BIOSYSTEMS, INC.
                                405 TASMAN DRIVE
                          SUNNYVALE, CALIFORNIA 94089
                                 (408) 541-8787
                            ------------------------

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

                         TO BE HELD ON AUGUST 30, 2000


To the stockholders of LJL BioSystems, Inc.:


     A special meeting of stockholders of LJL BioSystems, Inc., a Delaware
corporation, will be held on Wednesday, August 30, 2000 at 9:00 a.m., local
time, at the principal executive offices of LJL BioSystems located at 405 Tasman
Drive, Sunnyvale, California 94089, for the following purposes:


     1. To adopt the Agreement and Plan of Merger and Reorganization, dated as
        of June 7, 2000, among Molecular Devices Corporation, Mercury
        Acquisition Sub, Inc., a Delaware corporation and a wholly owned
        subsidiary of Molecular Devices, and LJL BioSystems, Inc.; and

     2. To transact such other business as may properly come before the special
        meeting or any adjournment or postponement thereof.


     The board of directors of LJL BioSystems has fixed the close of business on
July 14, 2000 as the record date for the determination of stockholders entitled
to notice of, and to vote at, the special meeting and any adjournment or
postponement thereof. Only holders of record of shares of LJL BioSystems common
stock at the close of business on the record date are entitled to notice of, and
to vote at, the special meeting. At the close of business on the record date,
LJL BioSystems had outstanding and entitled to vote 14,857,528 shares of common
stock. Holders of LJL BioSystems common stock are not entitled to dissenters'
rights under the Delaware General Corporation Law.


     YOUR VOTE IS IMPORTANT. THE AFFIRMATIVE VOTE OF THE HOLDERS OF A MAJORITY
OF THE OUTSTANDING SHARES OF LJL BIOSYSTEMS COMMON STOCK IS REQUIRED FOR
ADOPTION OF THE MERGER AGREEMENT. EVEN IF YOU PLAN TO ATTEND THE SPECIAL MEETING
IN PERSON, WE REQUEST THAT YOU SIGN AND RETURN THE ENCLOSED PROXY AND THUS
ENSURE THAT YOUR SHARES WILL BE REPRESENTED AT THE SPECIAL MEETING IF YOU ARE
UNABLE TO ATTEND. IF YOU SIGN, DATE AND MAIL YOUR PROXY CARD WITHOUT INDICATING
HOW YOU WISH TO VOTE, YOUR PROXY WILL BE COUNTED AS A VOTE IN FAVOR OF ADOPTION
OF THE MERGER AGREEMENT. IF YOU FAIL TO RETURN YOUR LJL BIOSYSTEMS PROXY CARD,
THE EFFECT WILL BE THAT YOUR SHARES WILL NOT BE COUNTED FOR PURPOSES OF
DETERMINING WHETHER A QUORUM IS PRESENT AT THE LJL BIOSYSTEMS SPECIAL MEETING.
IF YOU DO ATTEND THE SPECIAL MEETING AND WISH TO VOTE IN PERSON, YOU MAY
WITHDRAW YOUR PROXY AND VOTE IN PERSON.

                                          By Order of the Board of Directors,

                                          /s/ LEV J. LEYTES

                                          Lev J. Leytes

Sunnyvale, California                     President, Chief Executive Officer and


July 20, 2000                             Chairman of the Board


     LJL BIOSYSTEMS' BOARD OF DIRECTORS HAS DECLARED ADVISABLE, AND UNANIMOUSLY
RECOMMENDS, THAT LJL BIOSYSTEMS STOCKHOLDERS VOTE "FOR" ADOPTION OF THE MERGER
AGREEMENT.
<PAGE>   7

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
QUESTIONS AND ANSWERS ABOUT THE MERGER......................    1
SUMMARY.....................................................    3
RISK FACTORS................................................   16
  Risks Relating to the Merger..............................   16
  Risks Relating to Molecular Devices.......................   18
  Risks Relating to LJL BioSystems..........................   27
THE COMPANIES...............................................   39
  Molecular Devices.........................................   39
  Mercury Acquisition Sub, Inc. ............................   40
  LJL BioSystems............................................   40
THE SPECIAL MEETING OF MOLECULAR DEVICES STOCKHOLDERS.......   42
  Date, Time and Place......................................   42
  Purposes of the Special Meeting...........................   42
  Recommendation of Molecular Devices' Board of Directors...   42
  Record Date and Voting Power..............................   42
  Voting and Revocation of Proxies..........................   42
  Required Vote.............................................   43
  Solicitation of Proxies...................................   43
  Other Matters.............................................   43
THE SPECIAL MEETING OF LJL BIOSYSTEMS STOCKHOLDERS..........   44
  Date, Time and Place......................................   44
  Purposes of the Special Meeting...........................   44
  Recommendation of LJL BioSystems' Board of Directors......   44
  Record Date and Voting Power..............................   44
  Voting and Revocation of Proxies..........................   44
  Required Vote.............................................   44
  Solicitation of Proxies...................................   45
  Other Matters.............................................   45
THE MERGER..................................................   46
  General...................................................   46
  General Description of the Merger.........................   46
  Background................................................   46
  Reasons for the Merger....................................   48
  Molecular Devices' Reasons for the Merger.................   48
  LJL BioSystems' Reasons for the Merger....................   50
  Opinion of Molecular Devices' Financial Advisor...........   51
  Opinion of LJL BioSystems' Financial Advisor..............   57
  Interests of LJL BioSystems' Officers and Directors in the
     Merger.................................................   62
  Material Federal Income Tax Consequences..................   63
  Anticipated Accounting Treatment..........................   65
  Governmental Approvals....................................   65
  Restrictions on Resales by Affiliates.....................   65
CERTAIN TERMS OF THE MERGER AGREEMENT.......................   67
  The Merger................................................   67
  Effective Time of the Merger..............................   67
  Manner and Basis of Converting Shares.....................   67
  LJL BioSystems Stock Options and Warrants.................   68
  LJL BioSystems' Employee Stock Purchase Plan..............   68
  Continuation of Benefits..................................   68
  Representations and Warranties............................   69
</TABLE>


                                        i
<PAGE>   8


<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Covenants; Conduct of Business Prior to the Merger........   69
  Limitation on Considering Other Acquisition Proposals.....   72
  Conditions to the Merger..................................   73
  Termination of the Merger Agreement.......................   75
  Expenses and Termination Fees.............................   77
VOTING AGREEMENTS...........................................   79
  Voting Agreements Relating to Molecular Devices Shares....   79
  Voting Agreements Relating to LJL BioSystems Shares.......   79
MANAGEMENT AND OTHER INFORMATION............................   80
SECURITY OWNERSHIP BY CERTAIN BENEFICIAL OWNERS.............   81
  Beneficial Ownership of Molecular Devices Shares..........   81
  Beneficial Ownership of LJL BioSystems Shares.............   83
UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL
  STATEMENTS................................................   85
  Unaudited Pro Forma Condensed Combined Balance Sheet......   86
  Unaudited Pro Forma Condensed Combined Statements of
     Income.................................................   87
  Notes to Unaudited Pro Forma Condensed Combined Financial
     Statements.............................................   92
DESCRIPTION OF MOLECULAR DEVICES CAPITAL STOCK..............   95
  General...................................................   95
  Molecular Devices Common Stock............................   95
  Molecular Devices Preferred Stock.........................   95
  Transfer Agent and Registrar..............................   95
COMPARATIVE RIGHTS OF MOLECULAR DEVICES STOCKHOLDERS AND LJL
  BIOSYSTEMS STOCKHOLDERS...................................   96
  Size of the Board of Directors............................   96
  Removal of Directors......................................   96
  Filling New Seats or Vacancies on the Board of
     Directors..............................................   97
  Indemnification and Limitation of Liability...............   97
  Interested Director Transactions..........................   98
  Elimination of Actions by Written Consent of
     Stockholders...........................................   98
  Power to Call Special Meetings of Stockholders............   98
  Stockholder Approval of Certain Business Combinations.....   99
  Mergers...................................................  100
  Dissenters' Rights........................................  100
INDEPENDENT AUDITORS........................................  102
LEGAL MATTERS...............................................  102
EXPERTS.....................................................  102
STOCKHOLDER PROPOSALS.......................................  102
WHERE YOU CAN FIND MORE INFORMATION.........................  102
</TABLE>


<TABLE>
<S>                                                           <C>
Annexes:
A -- Agreement and Plan of Merger and Reorganization
B -- Form of Parent Voting Agreements
C -- Form of Company Voting Agreements
D -- Opinion of Gleacher & Co. LLC
E -- Opinion of ING Barings LLC
</TABLE>

                                       ii
<PAGE>   9

                     QUESTIONS AND ANSWERS ABOUT THE MERGER

 Q: WHY ARE THE TWO COMPANIES PROPOSING TO MERGE?

 A: Molecular Devices and LJL BioSystems are proposing to merge because we
    believe the resulting combination would result in a number of benefits,
    including the ability of the combined company to offer complementary product
    lines (which presents the opportunity to increase the breadth of products
    offered), the ability of the two companies to combine their technological
    resources to develop new products with increased functionality and bring
    them to market faster, and the opportunity for the combined company to
    compete more effectively in the increasingly competitive and rapidly
    changing market.

 Q: WHAT WILL LJL BIOSYSTEMS STOCKHOLDERS RECEIVE IN THE MERGER?

 A: As a result of the merger, LJL BioSystems stockholders will receive 0.30 of
    a share of Molecular Devices common stock for each share of LJL BioSystems
    common stock they own. For example, if you own 100 shares of LJL BioSystems
    common stock, you will receive 30 shares of Molecular Devices common stock
    in exchange for your LJL BioSystems shares. The number of shares of
    Molecular Devices common stock to be issued for each share of LJL BioSystems
    common stock is fixed and will not be adjusted based upon changes in the
    values of LJL BioSystems or Molecular Devices common stock. As a result, the
    value of the Molecular Devices shares you will receive in the merger will
    not be known before the merger, and will go up or down as the market price
    of Molecular Devices common stock goes up or down. We encourage you to
    obtain current market quotations of LJL BioSystems and Molecular Devices
    common stock.

 Q: WHAT DO I NEED TO DO NOW?

 A: We urge you to read this joint proxy statement/prospectus carefully,
    including its annexes, and to consider how the merger affects you. Then just
    mail your signed proxy card in the enclosed return envelope as soon as
    possible so that your shares can be voted at the special meeting of
    Molecular Devices stockholders or special meeting of LJL BioSystems
    stockholders.

 Q: WHAT HAPPENS IF I DO NOT RETURN A PROXY CARD?

 A: If you are a Molecular Devices stockholder, the failure to return your proxy
    card could be a factor in establishing a quorum for the special meeting of
    Molecular Devices stockholders. If you are an LJL BioSystems stockholder,
    the failure to return your proxy card will have the same effect as voting
    against the merger.

 Q: MAY I VOTE IN PERSON?

 A: Yes. You may attend the special meeting of Molecular Devices stockholders or
    the special meeting of LJL BioSystems stockholders, respectively, and vote
    your shares in person, rather than signing and returning your proxy card.

 Q: MAY I CHANGE MY VOTE AFTER I HAVE MAILED MY SIGNED PROXY CARD?

 A: Yes. You may change your vote at any time before your proxy card is voted at
    your special meeting. You can do this in one of three ways. First, you can
    send a written, dated notice stating that you would like to revoke your
    proxy. Second, you can complete, date, and submit a new proxy card. Third,
    you can attend the meeting and vote in person. Your attendance alone will
    not revoke your proxy. If you have instructed a broker to vote your shares,
    you must follow directions received from your broker to change those
    instructions.

                                        1
<PAGE>   10

 Q: IF MY SHARES ARE HELD IN "STREET NAME" BY MY BROKER, WILL MY BROKER VOTE MY
SHARES FOR ME?

 A: Your broker will not be able to vote your shares without instructions from
    you. You should instruct your broker to vote your shares, following the
    procedure provided by your broker.

 Q: SHOULD I SEND IN MY LJL BIOSYSTEMS STOCK CERTIFICATES NOW?

 A: No. If you are a LJL BioSystems stockholder, after the merger is completed,
    you will receive written instructions for exchanging your shares of LJL
    BioSystems common stock for shares of Molecular Devices common stock. You
    will also receive a cash payment for any fractional share. Molecular Devices
    stockholders will not exchange their stock certificates.

 Q: AM I ENTITLED TO DISSENTERS' RIGHTS?

 A: Molecular Devices and LJL BioSystems stockholders will not be entitled to
    dissenters' rights.

 Q: WHO CAN HELP ANSWER MY QUESTIONS?

 A: If you are a Molecular Devices stockholder, and would like additional
    copies, without charge, of this joint proxy statement/prospectus or if you
    have questions about the merger, including the procedures for voting your
    shares, you should contact:

       MOLECULAR DEVICES CORPORATION
       Attn: Investor Relations
       1311 Orleans Drive
       Sunnyvale, California 94089
       Telephone: (408) 747-1700

   If you are a LJL BioSystems stockholder, and would like additional copies,
   without charge, of this joint proxy statement/prospectus or if you have
   questions about the merger, including the procedures for voting your shares,
   you should contact:

       LJL BIOSYSTEMS, INC.
       Attn: Investor Relations
       405 Tasman Drive
       Sunnyvale, California 94089
       Telephone: (408) 548-0542

                                        2
<PAGE>   11

                                    SUMMARY


     This summary highlights selected information from this joint proxy
statement/prospectus and may not contain all of the information that is
important to you. To understand the merger fully and for a more complete
description of the legal terms of the merger, you should read carefully this
entire joint proxy statement/prospectus and the documents we refer to herein.
See "Where You Can Find More Information" on page 102. The merger agreement is
attached as Annex A to this joint proxy statement/prospectus. We encourage you
to read the merger agreement as it is the legal document that governs the
merger. We have included page references in parentheses to direct you to a more
complete description of the topics presented in this summary.


FORWARD-LOOKING INFORMATION

     Certain of the information relating to Molecular Devices, LJL BioSystems
and the combined company contained or incorporated by reference in this joint
proxy statement/prospectus is forward-looking in nature. All statements included
or incorporated by reference in this joint proxy statement/prospectus or made by
management of Molecular Devices or LJL BioSystems other than statements of
historical fact regarding Molecular Devices, LJL BioSystems or the combined
company are forward-looking statements. Examples of forward-looking statements
include statements regarding Molecular Devices', LJL BioSystems' or the combined
company's future financial results, operating results, product successes,
business strategies, projected costs, future products, competitive positions and
plans and objectives of management for future operations. In some cases, you can
identify forward-looking statements by terminology, such as "may," "will,"
"should," "would," "expects," "plans," "anticipates," "believes," "estimates,"
"predicts," "potential," or "continue' or the negative of these terms or other
comparable terminology. Any expectations based on these forward-looking
statements are subject to risks and uncertainties and other important factors,
including those discussed in the Risk Factors section of this joint proxy
statement/prospectus. These and many other factors could affect the future
financial and operating results of Molecular Devices, LJL BioSystems or the
combined company. These factors could cause actual results to differ materially
from expectations based on forward-looking statements made in this document or
elsewhere by or on behalf of Molecular Devices, LJL BioSystems or the combined
company.

THE COMPANIES (PAGE 39)

MOLECULAR DEVICES CORPORATION
1311 Orleans Drive
Sunnyvale, California 94089
(408) 747-1700

     Molecular Devices is a leading developer of high-performance, bioanalytical
measurement systems that accelerate and improve drug discovery and other life
sciences research. Molecular Devices' systems enable pharmaceutical and
biotechnology companies to leverage advances in genomics and combinatorial
chemistry by facilitating the high throughput and cost effective identification
and evaluation of drug candidates. Molecular Devices' instrument systems are
based on its advanced core technologies which integrate its expertise in
engineering, molecular and cell biology and chemistry. Molecular Devices'
systems are fundamental tools for drug discovery and life sciences research, and
its MAXline series of microplate readers and its FLIPR Cell Analysis systems are
market share leaders in their respective markets.

                                        3
<PAGE>   12

LJL BIOSYSTEMS, INC.
405 Tasman Drive
Sunnyvale, California 94089
(408) 541-8787

     LJL BioSystems designs, produces and sells infrastructure tools that
accelerate and enhance the process of discovering new drugs in the genomics and
post-genomics era. LJL BioSystems' products, including instruments and
consumables, are designed to provide flexible, cost-efficient, high throughput
solutions that can be used across all stages of the drug discovery process. LJL
BioSystems' customers include pharmaceutical, biotechnology and genomics
companies as well as research institutions. Since 1998, 21 of the top 25
pharmaceutical companies have purchased LJL BioSystems' products and more than
60% of these customers are repeat customers. In addition, LJL BioSystems has
entered into strategic collaborations with AstraZeneca in October 1999 and
SmithKline Beecham in September 1998 that provide each of them with early access
to certain of LJL BioSystems' new technologies. LJL BioSystems' customers
primarily use its products for high throughput drug discovery, including
screening and genotyping.

MERGER CONSIDERATION; FIXED EXCHANGE RATIO (PAGE 46)

     If you are an LJL BioSystems stockholder, you will receive 0.30 of a share
of Molecular Devices common stock in exchange for each share of LJL BioSystems
common stock you own. The actual number of whole shares you will receive in the
merger will be 0.30 multiplied by the number of shares of LJL BioSystems common
stock that you own at the effective time of the merger. You will receive cash
for any fractional share.


     The exchange ratio is fixed and, regardless of fluctuations in the market
prices of Molecular Devices common stock or LJL BioSystems common stock, will
not change between now and the date that the merger is completed. Moreover,
neither LJL BioSystems nor Molecular Devices has the right to terminate the
merger agreement or renegotiate the exchange ratio as a result of market price
fluctuations. We encourage you to obtain current market quotations of LJL
BioSystems and Molecular Devices common stock.


COMPARATIVE PER COMMON SHARE MARKET PRICE INFORMATION (PAGE 9)


     LJL BioSystems and Molecular Devices common stock are both listed on the
Nasdaq National Market. On June 7, 2000, the last full trading day prior to the
public announcement of the proposed merger, LJL BioSystems common stock closed
at $16.25, and Molecular Devices common stock closed at $59.06. On July 14,
2000, LJL BioSystems common stock closed at $24.88, and Molecular Devices common
stock closed at $84.00.


TAX MATTERS (PAGE 63)

     The exchange of shares of LJL BioSystems common stock for shares of
Molecular Devices common stock in the merger is intended to be tax-free to LJL
BioSystems stockholders for federal income tax purposes. Any cash received for
any fractional share, however, will result in the recognition of gain or loss as
if you sold your fractional share. Your tax basis in the shares of Molecular
Devices common stock that you receive in the merger will equal your current tax
basis in your LJL BioSystems common stock (reduced by the basis allocable to any
fractional share interest for which you receive cash).

     TAX MATTERS CAN BE COMPLICATED, AND THE TAX CONSEQUENCES OF THE MERGER TO
YOU WILL DEPEND ON THE FACTS OF YOUR OWN SITUATION. YOU SHOULD CONSULT YOUR OWN
TAX ADVISORS TO FULLY UNDERSTAND THE TAX CONSEQUENCES OF THE MERGER TO YOU.

                                        4
<PAGE>   13

REASONS FOR THE MERGER

MOLECULAR DEVICES (PAGE 48). The Molecular Devices board of directors approved
the merger based on a number of factors, including the following:

     - the ability of the combined company to offer complementary product lines,
       which presents the opportunity to increase the breadth of products
       offered;

     - the ability of the two companies to combine their technological resources
       to develop new products with increased functionality and bring them to
       market faster; and

     - the opportunity for the combined company to compete more effectively in
       the increasingly competitive and rapidly changing market.

LJL BIOSYSTEMS (PAGE 50). The LJL BioSystems board of directors approved the
merger based on a number of factors, including the following:

     - that by combining the sales and distribution forces of Molecular Devices
       and LJL BioSystems, the combined company could accelerate its market
       penetration rates at life science companies and broaden the impact and
       influence of the combined company throughout its customers' enterprises;

     - that by combining complementary operations, the combined company would
       have better opportunities for future growth;


     - the opportunity for LJL BioSystems stockholders to participate in a
       larger, stronger, more competitive company with a broader array of
       complementary technologies;


     - the strategic fit between Molecular Devices and LJL BioSystems, and the
       belief that the combined company has the potential to enhance stockholder
       value through additional opportunities and operating efficiencies; and

     - the strategic and financial alternatives available to LJL BioSystems.

RECOMMENDATIONS TO STOCKHOLDERS

TO MOLECULAR DEVICES STOCKHOLDERS (PAGE 42). The Molecular Devices board of
directors believes that the merger is advisable and fair to you and in your best
interests. The Molecular Devices board of directors unanimously recommends that
you vote "for" the issuance of shares of Molecular Devices common stock in the
merger.

TO LJL BIOSYSTEMS STOCKHOLDERS (PAGE 44). The LJL BioSystems board of directors
believes that the merger is advisable and fair to you and in your best
interests. The LJL BioSystems board of directors has declared advisable, and
unanimously recommends, that you vote "for" adoption of the merger agreement.

OPINIONS OF FINANCIAL ADVISORS

OPINION OF MOLECULAR DEVICES' FINANCIAL ADVISOR (PAGE 51). In deciding to
approve the merger, one of the factors that the Molecular Devices board of
directors considered was the opinion of its financial advisor, ING Barings LLC,
that, as of June 6, 2000, the exchange ratio pursuant to the merger agreement
was fair to the stockholders of Molecular Devices from a financial point of
view. The full text of the ING Barings opinion describes the basis for its
opinion and is attached as Annex E to this joint proxy statement/prospectus.
MOLECULAR DEVICES URGES YOU TO READ THE ENTIRE OPINION CAREFULLY.

OPINION OF LJL BIOSYSTEMS' FINANCIAL ADVISOR (PAGE 57). In deciding to approve
the merger, one of the factors that the LJL BioSystems board of directors
considered was the opinion of its financial advisor, Gleacher & Co. LLC,
delivered orally to the LJL BioSystems board of directors on June 6, 2000, and
confirmed in writing on June 7, 2000, that, based upon certain assumptions and
qualifications, the exchange ratio pursuant to the merger agreement was fair to
the stockholders of LJL BioSystems from a financial point of view. The full text
of the Gleacher & Co. opinion describes the basis for its opinion and

                                        5
<PAGE>   14

is attached as Annex D to this joint proxy statement/prospectus. LJL BIOSYSTEMS
URGES YOU TO READ THE ENTIRE OPINION CAREFULLY.

THE SPECIAL MEETINGS OF STOCKHOLDERS

THE MOLECULAR DEVICES SPECIAL MEETING OF STOCKHOLDERS (PAGE 42).


     Time, Date and Place. A special meeting of the stockholders of Molecular
Devices will be held on Wednesday, August 30, 2000, at the principal executive
offices of Molecular Devices located at 1311 Orleans Drive, Sunnyvale,
California at 10:30 a.m., local time, to vote on the approval of the issuance of
shares of Molecular Devices common stock in the merger.



     Record Date and Voting Power for Molecular Devices. You are entitled to
vote at the special meeting if you owned shares of Molecular Devices common
stock at the close of business on July 14, 2000, the record date for the special
meeting. You will have one vote at the special meeting for each share of
Molecular Devices common stock you owned at the close of business on the record
date. There are 11,508,585 shares of Molecular Devices common stock entitled to
be voted at the special meeting.


     Molecular Devices Required Vote. The affirmative vote of the holders of a
majority of the shares of Molecular Devices common stock present in person or
represented by proxy and entitled to vote at the special meeting is required for
approval of the issuance of the Molecular Devices shares in the merger.


     Share Ownership of Management. The directors and executive officers of
Molecular Devices and their affiliates own approximately 8.7% of the shares
entitled to vote at the special meeting. All of the directors and executive
officers of Molecular Devices have agreed to vote their shares in favor of the
issuance of shares of Molecular Devices common stock in the merger.


THE LJL BIOSYSTEMS SPECIAL MEETING OF STOCKHOLDERS (PAGE 44).


     Time, Date and Place. A special meeting of the stockholders of LJL
BioSystems will be held on Wednesday, August 30, 2000, at the principal
executive offices of LJL BioSystems located at 405 Tasman Drive, Sunnyvale,
California at 9:00 a.m., local time, to adopt the merger agreement.



     Record Date and Voting Power for LJL BioSystems. You are entitled to vote
at the special meeting if you owned shares of LJL BioSystems common stock at the
close of business on July 14, 2000, the record date for the special meeting. You
will have one vote at the special meeting for each share of LJL BioSystems
common stock you owned at the close of business on the record date. There are
14,857,528 shares of LJL BioSystems common stock entitled to be voted at the
special meeting.


     LJL BioSystems Required Vote. The adoption of the merger agreement requires
the affirmative vote of a majority of the shares of LJL BioSystems common stock
outstanding at the close of business on the record date.


     Share Ownership of Management. The directors and executive officers of LJL
BioSystems and their affiliates own approximately 25.4% of the shares entitled
to vote at the special meeting. All of the directors and executive officers of
LJL BioSystems have agreed to vote their shares in favor of adoption of the
merger agreement.


INTERESTS OF LJL BIOSYSTEMS' OFFICERS AND DIRECTORS IN THE MERGER (PAGE 62)

     When considering the recommendation by the LJL BioSystems board of
directors, you should be aware that a number of LJL BioSystems' officers and
directors have interests in the merger that are different from other LJL
BioSystems stockholders.


CONDITIONS TO THE MERGER (PAGE 73)


     The obligations of both Molecular Devices and LJL BioSystems to complete
the merger are subject to the satisfaction of certain conditions.

                                        6
<PAGE>   15


TERMINATION OF THE MERGER AGREEMENT (PAGE 75)


     Molecular Devices and LJL BioSystems can terminate the merger agreement
under certain conditions.


LIMITATION ON CONSIDERING OTHER ACQUISITION PROPOSALS (PAGE 72)


     LJL BioSystems has agreed not to consider a business combination or other
similar transaction with another party while the merger is pending unless the
other party has made an unsolicited proposal to the LJL BioSystems board of
directors for a superior transaction.


EXPENSES AND TERMINATION FEES (PAGE 77)


     The merger agreement provides that regardless of whether the merger
agreement is consummated, all expenses incurred by the parties shall be borne by
the party incurring such expenses, except in two instances where the expenses
are to be shared.

     The merger agreement requires, however, that LJL BioSystems pay Molecular
Devices a termination fee of $9.0 million if, among other things:


     - the merger agreement is terminated by LJL BioSystems or Molecular Devices
       because the special meeting of LJL BioSystems stockholders was held and
       the LJL BioSystems stockholders have failed to adopt the merger agreement
       and at or prior to the time of such termination, another acquisition
       proposal from a third party has been disclosed, announced, commenced,
       submitted or made and has not been withdrawn and abandoned by LJL
       BioSystems;


     - the merger agreement is terminated by Molecular Devices pursuant to a
       number of "triggering events" as that phrase is defined in the merger
       agreement, which include, but are not limited to, (1) a failure of the
       LJL BioSystems board of directors to recommend the adoption of the merger
       agreement, (2) LJL BioSystems fails to include a recommendation that the
       LJL BioSystems stockholders adopt the merger agreement, or (3) the board
       of directors accepts another acquisition proposal; or

     - the merger agreement is terminated by LJL BioSystems because the board of
       directors of LJL BioSystems has approved, endorsed, or recommended a
       superior offer from a third party.

     The merger agreement also requires LJL BioSystems to pay Molecular Devices
a termination fee of $5.0 million if the merger agreement is terminated by
Molecular Devices or LJL BioSystems because the special meeting of LJL
BioSystems stockholders was held and the merger agreement has not been adopted
by the stockholders of LJL BioSystems and no event has occurred since March 31,
2000 that has had, or would reasonably be expected to have, a "material adverse
effect" on Molecular Devices, as that phrase is defined in the merger agreement.

     Finally, the merger agreement requires Molecular Devices to pay LJL
BioSystems a termination fee of $5.0 million if, among other things:

     - the merger agreement is terminated by Molecular Devices or LJL BioSystems
       because the special meeting of Molecular Devices stockholders was held
       and the Molecular Devices stockholders fail to approve the issuance of
       stock in the merger and no event has occurred since March 31, 2000 that
       has had, or would reasonably be expected to have, a "material adverse
       effect" on LJL BioSystems or its subsidiary, as that phrase is defined in
       the merger agreement; or

     - subject to exceptions, the merger agreement is terminated by Molecular
       Devices or LJL BioSystems because the merger has not been consummated by
       December 31, 2000, and (1) at the time of the termination, the condition
       to the merger which specifies that Ernst & Young LLP shall deliver to
       Molecular Devices a letter concluding that the merger may be accounted
       for as a "pooling of interests" has not been satisfied and Molecular
       Devices has not waived compliance with that condition, (2) subject to
       exceptions, all other conditions to the consummation of the merger

                                        7
<PAGE>   16

       have been satisfied, and (3) the failure of Ernst & Young LLP to deliver
       the letter is not, with certain exceptions, directly or indirectly
       related to any action taken, or failed to be taken, by LJL BioSystems or
       any of its affiliates.

ANTICIPATED ACCOUNTING TREATMENT (PAGE 65)

     The merger is expected to be accounted for as a "pooling of interests" for
financial accounting purposes which means that Molecular Devices and LJL
BioSystems will be treated as if they had always been combined for accounting
and financial reporting purposes. The availability of this accounting treatment
is a condition to Molecular Devices' obligation to complete the merger.

GOVERNMENTAL APPROVALS (PAGE 65)

     The Hart-Scott-Rodino Antitrust Improvements Act prohibits us from
completing the merger until we have furnished certain information and materials
to the Antitrust Division of the Department of Justice and the Federal Trade
Commission and the required waiting period has ended. Both Molecular Devices and
LJL BioSystems have filed the required notification and report forms. The
required waiting period expires on July 27, 2000 unless extended.

                                        8
<PAGE>   17

                         MARKET PRICE AND DIVIDEND DATA

     Molecular Devices common stock and LJL BioSystems common stock are included
in the Nasdaq National Market under the symbols "MDCC" and "LJLB," respectively.
This table sets forth, for the periods indicated, the range of high and low
closing per share sales prices for Molecular Devices common stock and LJL
BioSystems common stock as reported on the Nasdaq National Market.


<TABLE>
<CAPTION>
                                                          MOLECULAR DEVICES      LJL BIOSYSTEMS
                                                             COMMON STOCK         COMMON STOCK
                                                          ------------------    ----------------
                                                            LOW       HIGH       LOW       HIGH
                                                          -------    -------    ------    ------
<S>                                                       <C>        <C>        <C>       <C>
YEAR ENDED DECEMBER 31, 1997
  First quarter.........................................  $13.38     $16.75         --        --
  Second quarter........................................   12.50      17.63         --        --
  Third quarter.........................................   16.50      21.88         --        --
  Fourth quarter........................................   14.88      23.75         --        --
YEAR ENDED DECEMBER 31, 1998
  First quarter.........................................   15.25      22.38     $ 6.75    $ 7.19
  Second quarter........................................   14.38      19.38       4.88      7.06
  Third quarter.........................................   12.12      18.50       2.50      5.00
  Fourth quarter........................................   16.00      21.75       2.13      3.25
YEAR ENDED DECEMBER 31, 1999
  First quarter.........................................   20.50      31.00       3.75      7.13
  Second quarter........................................   21.75      37.50       3.75      6.06
  Third quarter.........................................   26.06      41.50       3.00      4.63
  Fourth quarter........................................   27.94      52.00       2.25      8.25
YEAR ENDED DECEMBER 31, 2000
  First quarter.........................................   42.38     113.13       6.63     44.63
  Second quarter........................................   39.69      77.75       7.06     22.00
  Third quarter (through July 14, 2000).................   67.63      90.50      19.25     25.88
</TABLE>



     The following table sets forth the closing per share sales price of
Molecular Devices common stock and LJL BioSystems common stock, as reported on
the Nasdaq National Market, and the estimated equivalent per share price (as
explained below) of LJL BioSystems common stock on June 7, 2000, the last full
trading day before the public announcement of the proposed merger, and on July
14, 2000, the latest practicable trading day before the printing of this joint
proxy statement/prospectus:



<TABLE>
<CAPTION>
                                                                                    ESTIMATED EQUIVALENT
                                             MOLECULAR DEVICES    LJL BIOSYSTEMS       LJL BIOSYSTEMS
                                               COMMON STOCK        COMMON STOCK       PER SHARE PRICE
                                             -----------------    --------------    --------------------
<S>                                          <C>                  <C>               <C>
June 7, 2000...............................       $59.06              $16.25               $17.72
July 14, 2000..............................       $84.00              $24.88               $25.20
</TABLE>



     The estimated equivalent per share price of a share of LJL BioSystems
common stock equals the exchange ratio of 0.30 multiplied by the price of a
share of Molecular Devices common stock. You may use this calculation to
determine what your shares of LJL BioSystems common stock will be worth if the
merger is completed. If the merger had occurred on July 14, 2000, you would have
received a fraction of a share of Molecular Devices common stock worth $25.20
for each share of LJL BioSystems common stock you owned. The actual equivalent
per share price of a share of LJL BioSystems common stock that you will receive
if the merger closes may be different from this price because the per share
price of Molecular Devices common stock on the Nasdaq National Market fluctuates
continuously.


     Molecular Devices has never declared or paid cash dividends on its common
stock. Prior to June 1997, LJL BioSystems operated as an S corporation for
federal and state income tax purposes and distributed its taxable income to its
stockholders in the form of dividends. Since September 1997, shortly after LJL
BioSystems became a C corporation, LJL BioSystems has not paid any dividends.
The current policies of Molecular Devices and LJL BioSystems are to retain
earnings for use in their respective businesses. Following the merger, Molecular
Devices common stock will continue to be listed on the Nasdaq National Market,
and there will be no further market for LJL BioSystems common stock.

                                        9
<PAGE>   18

                               MOLECULAR DEVICES

             SELECTED HISTORICAL CONSOLIDATED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

     The following selected consolidated financial data should be read in
conjunction with Molecular Devices' "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and consolidated financial
statements and notes thereto, which we incorporate by reference in this joint
proxy statement/prospectus. Information as of December 31, 1999, 1998, 1997,
1996 and 1995 and for the years then ended has been derived from audited
financial statements, and the information as of March 31, 2000 and for the
three-month periods ended March 31, 2000 and 1999 has been derived from
unaudited financial statements, which are incorporated by reference in this
joint proxy statement/prospectus. Historical results are not necessarily
indicative of the results to be obtained in the future.

<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED
                                       MARCH 31,                    YEAR ENDED DECEMBER 31,
                                  -------------------   -----------------------------------------------
                                    2000       1999      1999      1998      1997      1996      1995
                                  --------   --------   -------   -------   -------   -------   -------
<S>                               <C>        <C>        <C>       <C>       <C>       <C>       <C>
CONSOLIDATED STATEMENT OF INCOME
  DATA:
Revenues........................  $17,068    $13,507    $61,985   $47,798   $38,286   $30,926   $25,615
Cost of revenues................    6,250      5,264     22,745    17,716    14,426    11,741    10,416
                                  -------    -------    -------   -------   -------   -------   -------
Gross margin....................   10,818      8,243     39,240    30,082    23,860    19,185    15,199
                                  -------    -------    -------   -------   -------   -------   -------
Operating expenses:
  Research and development......    1,888      1,590      7,363     5,686     4,721     4,581     3,639
  Write-off of acquired
     in-process research and
     development(1).............       --         --      2,037       876        --     4,637        --
  Selling, general and
     administrative.............    5,083      3,865     17,431    14,078    11,883     9,920     8,549
                                  -------    -------    -------   -------   -------   -------   -------
     Total operating expenses...    6,971      5,455     26,831    20,640    16,604    19,138    12,188
                                  -------    -------    -------   -------   -------   -------   -------
Income from operations..........    3,847      2,788     12,409     9,442     7,256        47     3,011
Other income (expense), net.....      387        421      1,421     1,584     1,220     1,079       (33)
                                  -------    -------    -------   -------   -------   -------   -------
Income before income taxes......    4,234      3,209     13,830    11,026     8,476     1,126     2,978
Income tax provision
  (benefit).....................    1,630      1,235      5,325     4,245     3,174    (1,126)   (1,081)
                                  -------    -------    -------   -------   -------   -------   -------
Net income......................  $ 2,604    $ 1,974    $ 8,505   $ 6,781   $ 5,302   $ 2,252   $ 4,059
                                  =======    =======    =======   =======   =======   =======   =======
Basic net income per share......  $  0.27    $  0.21    $  0.89   $  0.72   $  0.58   $  0.26   $  0.58
                                  =======    =======    =======   =======   =======   =======   =======
Diluted net income per share....  $  0.25    $  0.20    $  0.84   $  0.70   $  0.55   $  0.24   $  0.53
                                  =======    =======    =======   =======   =======   =======   =======
Shares used in computation of
  basic net income per share....    9,706      9,528      9,595     9,411     9,137     8,828     7,031
                                  =======    =======    =======   =======   =======   =======   =======
Shares used in computation of
  diluted net income per
  share.........................   10,596      9,963     10,071     9,738     9,721     9,524     7,644
                                  =======    =======    =======   =======   =======   =======   =======
OTHER DATA:
Diluted net income per share, as
  adjusted(2)...................  $  0.25    $  0.20    $  0.97   $  0.75   $  0.55   $  0.37   $  0.24
</TABLE>

                                       10
<PAGE>   19

<TABLE>
<CAPTION>
                                                                       DECEMBER 31,
                                          MARCH 31,   -----------------------------------------------
                                            2000       1999      1998      1997      1996      1995
                                          ---------   -------   -------   -------   -------   -------
<S>                                       <C>         <C>       <C>       <C>       <C>       <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and cash equivalents...............   $27,467    $28,192   $32,689   $26,773   $23,727   $20,379
Working capital.........................    49,080     48,745    43,438    35,752    27,395    22,786
Total assets............................    70,062     64,751    54,405    42,791    36,833    28,800
Total stockholders' equity..............    60,074     56,784    45,823    37,417    29,277    24,525
</TABLE>

-------------------------
(1) Our 1999 income from operations included a $2.0 million write-off for the
    acquisition of in-process technology and acquisition costs relating to our
    acquisition of Skatron Instruments AS. Our 1998 income from operations
    included an $876,000 write-off for the acquisition of in-process technology
    and acquisition costs relating to our acquisition of certain technology
    rights from Affymax Research Institute, a subsidiary of Glaxo Wellcome. Our
    1996 income from operations included a $4.6 million write-off for the
    acquisition of in-process technology and acquisition costs related to our
    acquisition of NovelTech Systems.

(2) We have excluded the impact of the write-offs of in-process technology and
    acquisition costs in 1996, 1998 and 1999 described in footnote (1) above,
    net of tax. We have also excluded the impact of the tax benefits we realized
    in 1995 and 1996 from the utilization of net operating loss carryforwards
    and included a provision for taxes at a 38.5% effective rate.

                                       11
<PAGE>   20

                                 LJL BIOSYSTEMS

             SELECTED HISTORICAL CONSOLIDATED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

     The following table contains LJL BioSystems' selected consolidated
financial data and is qualified by the more detailed consolidated financial
statements and notes thereto and "Management's Discussion and Analysis of
Financial Condition and Results of Operations," which we incorporate by
reference in this joint proxy statement/prospectus. Information as of December
31, 1999, 1998, 1997, 1996 and 1995 and for the years then ended has been
derived from audited financial statements, and the information as of March 31,
2000 and for the three-month periods ended March 31, 2000 and 1999 has been
derived from unaudited financial statements, which are incorporated by reference
in this joint proxy statement/prospectus. Historical results are not necessarily
indicative of the results to be obtained in the future.

<TABLE>
<CAPTION>
                                           THREE MONTHS ENDED
                                               MARCH 31,                    YEAR ENDED DECEMBER 31,
                                           ------------------   -----------------------------------------------
                                             2000      1999       1999       1998      1997      1996     1995
                                           --------   -------   --------   --------   -------   ------   ------
<S>                                        <C>        <C>       <C>        <C>        <C>       <C>      <C>
STATEMENT OF OPERATIONS DATA
Net sales................................  $  3,111   $ 1,359   $  9,917   $  4,436   $ 5,204   $9,285   $5,151
Cost of sales............................     1,111       698      3,554      2,487     2,319    2,755    1,174
                                           --------   -------   --------   --------   -------   ------   ------
  Gross profit...........................     2,000       661      6,363      1,949     2,885    6,530    3,977
                                           --------   -------   --------   --------   -------   ------   ------
Operating expenses:
  Research and development...............     2,099     1,483      6,787      5,472     3,511    2,384    1,740
  Selling, general and administrative....     2,395     1,689      8,199      5,308     2,145    4,062    1,963
                                           --------   -------   --------   --------   -------   ------   ------
    Total operating expenses.............     4,494     3,172     14,986     10,780     5,656    6,446    3,703
                                           --------   -------   --------   --------   -------   ------   ------
Income (loss) from operations............    (2,494)   (2,511)    (8,623)    (8,831)   (2,771)      84      274
Interest and other income, net...........       240       180        590        629       237      181       87
Interest expense.........................       (25)      (20)       (90)       (35)       (9)      (5)      (5)
                                           --------   -------   --------   --------   -------   ------   ------
Income (loss) before provision for income
  taxes..................................    (2,279)   (2,351)    (8,123)    (8,237)   (2,543)     260      356
Provision for income taxes...............         4        --         15         --        12        2        4
                                           --------   -------   --------   --------   -------   ------   ------
Net income (loss)........................    (2,283)   (2,351)    (8,138)    (8,237)   (2,555)     258      352
Accretion of mandatorily redeemable
  convertible preferred stock redemption
  value..................................        --        --         --       (254)     (636)      --       --
                                           --------   -------   --------   --------   -------   ------   ------
Net income (loss) available to common
  stockholders(1)........................  $ (2,283)  $(2,351)  $ (8,138)  $ (8,491)  $(3,191)  $  258   $  352
                                           ========   =======   ========   ========   =======   ======   ======
Basic and diluted net income (loss) per
  share available to common
  stockholders(1)........................  $  (0.16)  $ (0.20)  $  (0.65)  $  (0.91)  $ (0.71)  $ 0.06   $ 0.08
                                           ========   =======   ========   ========   =======   ======   ======
Shares used in computation of basic and
  diluted net income (loss) per share
  available to common stockholders(1)....    14,000    11,969     12,506      9,283     4,504    4,501    4,501
                                           ========   =======   ========   ========   =======   ======   ======
</TABLE>

<TABLE>
<CAPTION>
                                                                                  DECEMBER 31,
                                           MARCH 31,             -----------------------------------------------
                                             2000                  1999       1998      1997      1996     1995
                                           ---------             --------   --------   -------   ------   ------
<S>                                        <C>         <C>       <C>        <C>        <C>       <C>      <C>
BALANCE SHEET DATA:
Cash, cash equivalents and investments...  $ 26,460              $  8,458   $ 10,204   $ 5,525   $1,166   $1,773
Total assets.............................    32,184                14,358     13,458     6,793    2,458    2,483
Mandatorily redeemable convertible
  preferred stock........................        --                    --         --     9,308       --       --
Retained earnings (accumulated
  deficit)...............................   (22,662)              (20,379)   (12,241)   (3,750)    (226)      46
Total stockholders' equity (deficit).....    27,195                 9,780     10,420    (3,795)    (187)      85
</TABLE>

-------------------------
(1) See "Notes to Consolidated Financial Statements" in LJL BioSystems' Annual
    Report on Form 10-K for the fiscal year ended December 31, 1999 for a
    description of the computation of basic and diluted per share amounts,
    incorporated by reference herein.

                                       12
<PAGE>   21

          SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

The selected unaudited pro forma combined financial information gives effect to
the proposed merger of Molecular Devices and LJL BioSystems on a pooling of
interests basis. The Molecular Devices and LJL BioSystems unaudited pro forma
combined balance sheet data assume that the merger of Molecular Devices and LJL
BioSystems took place on March 31, 2000 and combines the Molecular Devices and
LJL BioSystems historical consolidated balance sheets at March 31, 2000. The
Molecular Devices and LJL BioSystems unaudited pro forma combined statements of
income data assume that the merger of Molecular Devices and LJL BioSystems took
place as of the beginning of the periods presented and combine Molecular
Devices' and LJL BioSystems' historical consolidated statements of income data
for the years ended December 31, 1999, 1998 and 1997 and for the three-month
periods ended March 31, 2000 and March 31, 1999.

     The selected unaudited pro forma combined financial data are presented for
illustrative purposes only and are not necessarily indicative of the combined
financial position or results of operations of future periods or the results
that actually would have been realized had the entities been a single entity
during these periods. The selected unaudited pro forma combined financial data
as of March 31, 2000 and for each of the years ended December 31, 1999, 1998,
1997, and for the three-months ended March 31, 2000 and March 31, 1999 are
derived from the unaudited pro forma condensed combined financial statements
included elsewhere in this joint proxy statement/prospectus and should be read
in conjunction with those statements and the related notes. See "Unaudited Pro
Forma Condensed Combined Financial Statements."

<TABLE>
<CAPTION>
                                                   THREE MONTHS ENDED
                                                        MARCH 31,          YEAR ENDED DECEMBER 31,
                                                   -------------------   ---------------------------
                                                     2000       1999      1999      1998      1997
                                                   --------   --------   -------   -------   -------
<S>                                                <C>        <C>        <C>       <C>       <C>
CONSOLIDATED STATEMENTS OF INCOME DATA:
Revenues.........................................  $20,179    $14,866    $71,902   $52,234   $43,490
Income from operations...........................    1,353        277      3,786       611     4,485
Net income.......................................    1,186        572      3,651     1,833     3,916
Net income per share:
  Basic..........................................     0.09       0.04       0.27      0.15      0.35
  Diluted........................................     0.08       0.04       0.26      0.14      0.33
Shares used in basic per share calculations......   13,906     13,119     13,347    12,407    11,107
Shares used in diluted per share calculations....   15,205     13,846     14,149    12,965    11,906
</TABLE>


<TABLE>
<CAPTION>
                                                              MARCH 31,
                                                                2000
                                                              ---------
<S>                                                           <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital.............................................    66,695
Total assets................................................   110,853
Total stockholders' equity..................................    78,376
</TABLE>


                                       13
<PAGE>   22

                           COMPARATIVE PER SHARE DATA

     The information below reflects:

     - the historical net income and the March 31, 2000 book value per share of
       Molecular Devices common stock and the historical net loss and the March
       31, 2000 book value per share of LJL BioSystems common stock in
       comparison with the unaudited pro forma net income and the March 31, 2000
       book value per share after giving effect to the proposed merger of
       Molecular Devices with LJL BioSystems on a pooling of interests basis;
       and

     - the equivalent historical net income and the March 31, 2000 book value
       per share attributable to 0.30 of a share of Molecular Devices common
       stock which will be received for each share of LJL BioSystems common
       stock.

     You should read the following tables in conjunction with the unaudited pro
forma condensed combined financial statements included elsewhere in this
document, the historical consolidated financial statements and related notes of
Molecular Devices and the historical consolidated financial statements of LJL
BioSystems which are incorporated by reference in this joint proxy
statement/prospectus.

                        MOLECULAR DEVICES PER SHARE DATA

<TABLE>
<CAPTION>
                                                THREE MONTHS ENDED
                                                    MARCH 31,          YEAR ENDED DECEMBER 31,
                                                ------------------    --------------------------
                                                 2000       1999       1999      1998      1997
                                                -------    -------    ------    ------    ------
<S>                                             <C>        <C>        <C>       <C>       <C>
HISTORICAL PER COMMON SHARE DATA
Net income per common share -- basic(1).......  $ 0.27     $ 0.21     $ 0.89    $ 0.72    $ 0.58
Net income per common share -- diluted(1).....  $ 0.25     $ 0.20     $ 0.84    $ 0.70    $ 0.55
Book value per share(2):......................  $ 6.16
</TABLE>

                         LJL BIOSYSTEMS PER SHARE DATA

<TABLE>
<CAPTION>
                                                THREE MONTHS ENDED
                                                    MARCH 31,          YEAR ENDED DECEMBER 31,
                                                ------------------    --------------------------
                                                 2000       1999       1999      1998      1997
                                                -------    -------    ------    ------    ------
<S>                                             <C>        <C>        <C>       <C>       <C>
HISTORICAL PER COMMON SHARE DATA
Net loss per share available to common
  stockholders -- basic and diluted(1)........  $(0.16)    $(0.20)    $(0.65)   $(0.91)   $(0.71)
Book value per share(2):......................  $ 1.84
</TABLE>

                                       14
<PAGE>   23

                      MOLECULAR DEVICES AND LJL BIOSYSTEMS
                         PRO FORMA COMBINED SHARE DATA


<TABLE>
<CAPTION>
                                                      THREE MONTHS
                                                         ENDED
                                                       MARCH 31,       YEAR ENDED DECEMBER 31,
                                                     --------------    -----------------------
                                                     2000     1999     1999     1998     1997
                                                     -----    -----    -----    -----    -----
<S>                                                  <C>      <C>      <C>      <C>      <C>
PRO FORMA COMBINED PER COMMON SHARE DATA
Net income per Molecular Devices
  share -- basic(1)................................  $0.09    $0.04    $0.27    $0.15    $0.35
Net income per Molecular Devices
  share -- diluted(1)..............................  $0.08    $0.04    $0.26    $0.14    $0.33
Net income per equivalent LJL BioSystems share --
  basic(3).........................................  $0.03    $0.01    $0.08    $0.05    $0.11
Net income per equivalent LJL BioSystems share --
  diluted(3).......................................  $0.02    $0.01    $0.08    $0.04    $0.10
Book value per Molecular Devices share(2)..........  $5.53
Book value per equivalent LJL BioSystems
  share(3).........................................  $1.66
</TABLE>


-------------------------
(1) Basic net income (loss) per share is computed using the weighted average
    number of common shares outstanding during the period. Diluted net income
    (loss) per share is computed using the weighted average number of common and
    common equivalent shares outstanding during the period. Common equivalent
    shares consist of the incremental common shares issuable upon conversion of
    the convertible preferred stock and shares issuable upon the exercise of
    stock options and warrants. Common equivalent shares are excluded from the
    computations if their effect is antidilutive.

(2) The book value per Molecular Devices share and per LJL BioSystems share is
    computed by dividing stockholders' equity by the number of shares of common
    stock outstanding at March 31, 2000. The pro forma combined book value per
    share is computed by dividing pro forma stockholders' equity by the pro
    forma number of shares of Molecular Devices common stock outstanding as of
    March 31, 2000 assuming the merger had occurred as of that date.

(3) The equivalent pro forma combined book value and net income per LJL
    BioSystems share is calculated by multiplying the pro forma combined share
    amounts by the exchange ratio of 0.30 of a share of Molecular Devices common
    stock for each share of LJL BioSystems common stock.

                                       15
<PAGE>   24

                                  RISK FACTORS

     You should consider the following risk factors in evaluating whether to
approve the issuance of shares of Molecular Devices common stock in the merger,
in the case of the Molecular Devices stockholders, or adopt the merger
agreement, in the case of the LJL BioSystems stockholders. These factors should
be considered in conjunction with the other information included or incorporated
by reference in this joint proxy statement/prospectus.

RISKS RELATING TO THE MERGER

IF WE DO NOT SUCCESSFULLY INTEGRATE THE COMPANIES INTO A SINGLE BUSINESS AND
REALIZE THE EXPECTED BENEFITS OF THE MERGER, WE WILL HAVE INCURRED SIGNIFICANT
COSTS WHICH MAY HARM OUR BUSINESS.

     Molecular Devices expects to incur costs from integrating LJL BioSystems'
operations, products and personnel. These costs may be substantial and may
include costs for:

     - employee redeployment, relocation or severance;

     - conversion of information systems;

     - reorganization or closures of facilities; and

     - relocation or disposition of excess equipment.

     We do not know whether Molecular Devices will be successful in these
integration efforts and cannot assure you that we will realize the expected
benefits of the merger.

IF CUSTOMER RELATIONSHIPS OR STRATEGIC PARTNERSHIPS ARE DISRUPTED BY THE MERGER,
OUR SALES COULD DECLINE OR WE COULD LOSE CUSTOMERS.

     Customers of Molecular Devices and LJL BioSystems may not continue their
current buying patterns during the pendency of, and following, the merger. Any
significant delay or reduction in orders for Molecular Devices' or LJL
BioSystems' products could have a material adverse effect on the combined
company's business, financial condition and results of operations. Customers may
defer purchasing decisions as they evaluate the likelihood of successful
integration of Molecular Devices' and LJL BioSystems' products and the combined
company's future product strategy. Customers may also consider purchasing
products of competitors. In addition, by increasing the breadth of Molecular
Devices' and LJL BioSystems' business, the merger may make it more difficult for
the combined company to enter into or maintain relationships, including
relationships with customers or partners.

IF WE ARE NOT SUCCESSFUL IN INTEGRATING OUR ORGANIZATIONS, WE WILL NOT BE ABLE
TO OPERATE EFFICIENTLY AFTER THE MERGER.

     Achieving the benefits of the merger will also depend in part on the
successful integration of Molecular Devices' and LJL BioSystems' operations and
personnel in a timely and efficient manner. For example, such integration
requires coordination of different development, engineering, sales, marketing,
manufacturing and administrative teams. This, too, will be difficult and
unpredictable because of possible cultural conflicts and different opinions on
technical decisions, product roadmaps and other decisions. If we cannot
successfully integrate our operations and personnel, we will not realize the
expected benefits of the merger and/or business results of operations may be
seriously harmed.

INTEGRATING OUR COMPANIES MAY DIVERT MANAGEMENT'S ATTENTION AWAY FROM OUR
OPERATIONS.

     Successful integration of Molecular Devices' and LJL BioSystems'
operations, products and personnel may place a significant burden on our
management and our internal resources. The diversion of management attention and
any difficulties encountered in the transition and integration process could
have a material adverse effect on the combined company's business, financial
condition and operating results.

                                       16
<PAGE>   25

FAILURE TO RETAIN KEY EMPLOYEES COULD DIMINISH THE BENEFITS OF THE MERGER.

     The successful combination of Molecular Devices and LJL BioSystems will
depend in part on the retention of key personnel. We cannot assure you that the
combined company will be able to retain key management, technical, sales,
customer support and other personnel, or that the anticipated benefits of their
expertise, experience and capabilities will be realized.

IF WE DO NOT SUCCESSFULLY MANUFACTURE, PROMOTE, SELL AND SERVICE OUR PRODUCTS,
AND INTEGRATE OUR TECHNOLOGIES TO DEVELOP NEW PRODUCTS, WE MAY LOSE CUSTOMERS
AND FAIL TO ACHIEVE OUR FINANCIAL OBJECTIVES.

     Achieving the benefits of the merger will depend in part on our ability to
continue to successfully manufacture, promote, sell and service our products,
and integrate our technologies to develop new products and product features, in
a timely and efficient manner. In order to provide enhanced and more valuable
products to our customers after the merger, we will need to integrate our
development organizations. This will be difficult and unpredictable because our
products:

     - are highly complex;

     - involve different technologies;

     - have been developed independently; and

     - were designed without regard to such integration.

If we cannot successfully manufacture, promote, sell and service our products
and integrate our technologies to provide customers with new products and
product features in the future on a timely basis, we may lose customers and our
business and results of operations may be seriously harmed.

BECAUSE LJL BIOSYSTEMS STOCKHOLDERS WILL RECEIVE A FIXED NUMBER OF SHARES OF
MOLECULAR DEVICES COMMON STOCK IN THE MERGER, RATHER THAN A FIXED VALUE, IF THE
MARKET PRICE OF MOLECULAR DEVICES COMMON STOCK DECLINES, THE LJL BIOSYSTEMS
STOCKHOLDERS WILL RECEIVE CONSIDERATION IN THE MERGER OF A LESSER VALUE.


     Upon completion of the merger, each share of LJL BioSystems common stock
will be converted into 0.30 of a share of Molecular Devices common stock. Since
the exchange ratio is fixed, the number of shares that LJL BioSystems
stockholders will receive in the merger will not change, even if the market
price of Molecular Devices common stock changes. There will be no adjustment of
the exchange ratio based on fluctuations in the price of Molecular Devices
common stock. In recent years, and particularly in recent months, the stock
market, in general, and the securities of technology companies, in particular,
have experienced extreme price and volume fluctuations. These market
fluctuations may adversely affect the market price of Molecular Devices common
stock. In addition, events or circumstances specific to Molecular Devices could
cause the price of its common stock to decline. See "-- Risks Relating to
Molecular Devices." The market price of Molecular Devices common stock upon and
after completion of the merger could be lower than the market price on the date
of the merger agreement or the current market price. LJL BioSystems stockholders
should obtain recent market quotations of Molecular Devices common stock and LJL
BioSystems common stock before they vote on adoption of the merger agreement.


FAILURE OF THE MERGER TO BE TREATED AS A POOLING OF INTERESTS UNDER ACCOUNTING
RULES COULD RESULT IN A REDUCTION OF REPORTED EARNINGS.

     We expect the merger to be accounted for under the pooling-of-interests
accounting method and financial reporting rules. To qualify the merger as
pooling-of-interests for accounting purposes, certain criteria established in
opinions by the Accounting Principles Board and interpreted by the Financial
Accounting Standards Board and the Securities and Exchange Commission must be
met. These opinions are complex and the interpretation of them is subject to
change. In addition, the availability of pooling-of-interests accounting
treatment depends in part upon circumstances and events occurring after the
acquisition. The failure of the merger to qualify for pooling-of-interests
accounting treatment for financial

                                       17
<PAGE>   26

reporting purposes for any reason would materially adversely affect the combined
company's reported earnings and likely, the price of its common stock.

THE MARKET PRICE OF MOLECULAR DEVICES' COMMON STOCK MAY DECLINE AS A RESULT OF
THE MERGER.

     The market price of Molecular Devices' common stock may decline as a result
of the merger if:

     - The integration of Molecular Devices and LJL BioSystems is unsuccessful;

     - We do not achieve the perceived benefits of the merger as rapidly or to
       the extent anticipated by financial analysts or investors; or

     - The effect of the merger on our financial results is not consistent with
       the expectations of financial analysts or investors.

RISKS RELATING TO MOLECULAR DEVICES

VARIATIONS IN THE AMOUNT OF TIME IT TAKES FOR MOLECULAR DEVICES TO SELL ITS
PRODUCTS AND COLLECT ACCOUNTS RECEIVABLE AND THE TIMING OF CUSTOMER ORDERS MAY
CAUSE FLUCTUATIONS IN ITS OPERATING RESULTS, WHICH COULD CAUSE ITS STOCK PRICE
TO DECLINE.

     The timing of capital equipment purchases by customers is expected to be
uneven and difficult to predict. Molecular Devices' products represent major
capital purchases for its customers. Molecular Devices estimates that the
average order price for its MAXline products is $17,000, and that the average
order price for its FLIPR products is $350,000. Accordingly, Molecular Devices'
customers generally take a relatively long time to evaluate its products, and a
significant portion of its revenues is typically derived from sales of a small
number of relatively high-priced products. Purchases are generally made by
purchase orders and not long-term contracts. Delays in receipt of anticipated
orders for Molecular Devices' relatively high priced products could lead to
substantial variability from quarter to quarter. Furthermore, Molecular Devices
has historically received purchase orders and made a significant portion of each
quarter's product shipments near the end of the quarter. If that pattern
continues, even short delays in the receipt of orders or shipment of products at
the end of a quarter could have a material adverse effect on results of
operations for that quarter.

     Molecular Devices expends significant resources educating and providing
information to its prospective customers regarding the uses and benefits of its
products. Because of the number of factors influencing the sales process, the
period between Molecular Devices' initial contact with a customer and the time
when it recognizes revenue from that customer, if ever, varies widely. Molecular
Devices' sales cycles typically range from three to six months, but can be much
longer. During these cycles, Molecular Devices commits substantial resources to
its sales efforts in advance of receiving any revenue, and it may never receive
any revenue from a customer despite its sales efforts.

     The relatively high purchase price for a customer order contributes to
collection delays that result in working capital volatility. While the terms of
most of Molecular Devices' purchase orders require payment within 30 days of
product shipment, in the past it has experienced significant collection delays.
Molecular Devices cannot predict whether it will continue to experience similar
or more severe delays.

     The capital spending policies of Molecular Devices' customers have a
significant effect on the demand for its products. Those policies are based on a
wide variety of factors, including resources available to make purchases,
spending priorities, and policies regarding capital expenditures during industry
downturns or recessionary periods. Any decrease in capital spending by Molecular
Devices' customers resulting from any of these factors could harm its business.

MOLECULAR DEVICES DEPENDS ON ORDERS THAT ARE RECEIVED AND SHIPPED IN THE SAME
QUARTER AND THEREFORE HAVE LIMITED VISIBILITY OF FUTURE PRODUCT SHIPMENTS.

     Molecular Devices' net sales in any given quarter depend upon a combination
of orders received in that quarter for shipment in that quarter and shipments
from backlog. Molecular Devices' products are

                                       18
<PAGE>   27

typically shipped within 30 to 90 days of purchase order receipt. As a result,
Molecular Devices does not believe that the amount of backlog at any particular
date is indicative of its future level of sales. Molecular Devices' backlog at
the beginning of each quarter does not include all product sales needed to
achieve expected revenues for that quarter. Consequently, Molecular Devices is
dependent on obtaining orders for products to be shipped in the same quarter
that the order is received. Moreover, customers may reschedule shipments, and
production difficulties could delay shipments.

     Accordingly, Molecular Devices has limited visibility of future product
shipments, and its results of operations are subject to significant variability
from quarter to quarter.

MANY OF MOLECULAR DEVICES' CURRENT AND POTENTIAL COMPETITORS HAVE SIGNIFICANTLY
GREATER RESOURCES THAN MOLECULAR DEVICES DOES, AND INCREASED COMPETITION COULD
IMPAIR SALES OF ITS PRODUCTS.

     Molecular Devices operates in a highly competitive industry and faces
competition from companies that design, manufacture and market instruments for
use in the life sciences research industry, from genomic, pharmaceutical,
biotechnology and diagnostic companies and from academic and research
institutions and government or other publicly-funded agencies, both in the
United States and abroad. Molecular Devices may not be able to compete
effectively with all of these competitors. Many of these companies and
institutions have greater financial, engineering, manufacturing, marketing and
customer support resources than Molecular Devices does. As a result, Molecular
Devices' competitors may be able to respond more quickly to new or emerging
technologies or market developments by devoting greater resources to the
development, promotion and sale of products, which could impair sales of
Molecular Devices' products. Moreover, there has been significant merger and
acquisition activity among competitors and potential competitors of Molecular
Devices. These transactions by its competitors and potential competitors may
provide them with a competitive advantage over Molecular Devices by enabling
them to rapidly expand their product offerings and service capabilities to meet
a broader range of customer needs. Many of Molecular Devices' existing and
potential customers are large companies that require global support and service,
which may be easier for the larger competitors of Molecular Devices to provide.

     Molecular Devices believes that competition within the markets that it
serves is primarily driven by the need for innovative products that address the
needs of customers. Molecular Devices attempts to counter competition by seeking
to develop new products and provide quality products and services that meet
customers' needs. Molecular Devices cannot assure you, however, that it will be
able to successfully develop new products or that its existing or new products
and services will adequately meet its customers' needs.

     Rapidly changing technology, evolving industry standards, changes in
customer needs, emerging competition and frequent new product and service
introductions characterize the markets for Molecular Devices' products. To
remain competitive, Molecular Devices will be required to develop new products
and periodically enhance its existing products in a timely manner. Molecular
Devices is facing increased competition as new companies entering the market
with new technologies compete, or will compete, with Molecular Devices' products
and future products. Molecular Devices cannot assure you that one or more of its
competitors will not succeed in developing or marketing technologies or products
that are more effective or commercially attractive than Molecular Devices'
products or future products, or that would render Molecular Devices'
technologies and products obsolete or uneconomical. Molecular Devices' future
success will depend in large part on its ability to maintain a competitive
position with respect to its current and future technologies, which it may not
be able to do. In addition, delays in the launch of its new products may result
in loss of market share due to its customers' purchases of competitors' products
during any delay.

IF MOLECULAR DEVICES IS NOT SUCCESSFUL IN DEVELOPING NEW AND ENHANCED PRODUCTS,
IT MAY LOSE MARKET SHARE TO ITS COMPETITORS.

     The life sciences instrumentation market is characterized by rapid
technological change and frequent new product introductions. Over 70% of
Molecular Devices' revenues in 1999 were derived from the sale

                                       19
<PAGE>   28

of products that were introduced in the last three years, and Molecular Devices'
future success will depend on its ability to enhance its current products and to
develop and introduce, on a timely basis, new products that address the evolving
needs of its customers. Molecular Devices may experience difficulties or delays
in its development efforts with respect to new products, and it may not
ultimately be successful in developing them. Any significant delay in releasing
new systems could adversely affect Molecular Devices' reputation, give a
competitor a first-to-market advantage or cause a competitor to achieve greater
market share. In addition, Molecular Devices' future success depends on its
continued ability to develop new applications for its existing products. If
Molecular Devices is not able to complete the development of these applications,
or if it experiences difficulties or delays, Molecular Devices may lose its
current customers and may not be able to attract new customers, which could
seriously harm its business and its future growth prospects.

MOLECULAR DEVICES MUST EXPEND A SIGNIFICANT AMOUNT OF TIME AND RESOURCES TO
DEVELOP NEW PRODUCTS AND IF THESE PRODUCTS DO NOT ACHIEVE COMMERCIAL ACCEPTANCE,
MOLECULAR DEVICES' OPERATING RESULTS MAY SUFFER.

     Molecular Devices expects to spend a significant amount of time and
resources to develop new products and refine existing products. In light of the
long product development cycles inherent in its industry, these expenditures
will be made well in advance of the prospect of deriving revenue from the sale
of new products. Molecular Devices' ability to commercially introduce and
successfully market new products is subject to a wide variety of challenges
during this development cycle that could delay introduction of these products.
In addition, since Molecular Devices' customers are not obligated by long-term
contracts to purchase its products, its anticipated product orders may not
materialize, or orders that do materialize may be canceled. As a result, if
Molecular Devices does not achieve market acceptance of new products, its
operating results will suffer. In particular, while FLIPR and CLIPR reagent kits
have recently been introduced to the market, they have had only limited sales to
date and have not yet been widely commercially accepted. Molecular Devices
cannot predict whether these or other new products that it expects to introduce
will achieve commercial acceptance. Molecular Devices' products are generally
priced higher than competitive products, which may impair commercial acceptance.

IF MOLECULAR DEVICES DELIVERS PRODUCTS WITH DEFECTS, ITS CREDIBILITY WILL BE
HARMED AND THE SALES AND MARKET ACCEPTANCE OF ITS PRODUCTS WILL DECREASE.

     Molecular Devices' products are complex and sometimes have contained
errors, defects and bugs when introduced. If Molecular Devices delivers products
with errors, defects or bugs, its credibility and the market acceptance and
sales of its products would be harmed. Further, if its products contain errors,
defects or bugs, Molecular Devices may be required to expend significant capital
and resources to alleviate such problems. Defects could also lead to product
liability as a result of product liability lawsuits against it or against its
customers. Molecular Devices has agreed to indemnify its customers in some
circumstances against liability arising from defects in its products. In the
event of a successful product liability claim, Molecular Devices could be
obligated to pay damages significantly in excess of its product liability
insurance limits.

THE RECENT ISSUANCE BY THE SEC OF AN ACCOUNTING BULLETIN RELATED TO REVENUE
RECOGNITION, SAB 101, MAY HAVE A MATERIAL ADVERSE IMPACT ON MOLECULAR DEVICES'
FINANCIAL PERFORMANCE.

     In December 1999, the SEC issued Staff Accounting Bulletin No. 101, Revenue
Recognition in Financial Statements, referred to as SAB 101. SAB 101 summarizes
the SEC staff's views in applying generally accepted accounting principles to
revenue recognition in financial statements. Molecular Devices is currently in
the process of evaluating SAB 101 and what effect it may have on its financial
statements. Accordingly, Molecular Devices has not determined whether SAB 101
will have a material impact on its financial position or results of operations.
In the event that the implementation of SAB 101 requires Molecular Devices to
report a change in accounting principles related to its revenue recognition
policy, Molecular Devices would be required to report such change no later than
the quarter ending December 31, 2000. In addition to other uncertain risks
related to SAB 101, it is possible that the application of the

                                       20
<PAGE>   29

guidance provided in SAB 101 will result in increased fluctuations in its
quarterly operating results and increase the likelihood that Molecular Devices
may fail to meet the expectations of securities analysts for any period.

MOST OF MOLECULAR DEVICES' CURRENT AND POTENTIAL CUSTOMERS ARE FROM THE
PHARMACEUTICAL AND BIOTECHNOLOGY INDUSTRIES AND IT IS SUBJECT TO RISKS FACED BY
THOSE INDUSTRIES.

     Molecular Devices derives a significant portion of its revenues from sales
to pharmaceutical and biotechnology companies. Molecular Devices expects that
sales to pharmaceutical and biotechnology companies will continue to be a
primary source of revenues for the foreseeable future. As a result, Molecular
Devices is subject to risks and uncertainties that affect the pharmaceutical and
biotechnology industries, such as pricing pressures as third-party payors
continue challenging the pricing of medical products and services, government
regulation and uncertainty of technological change, and reduction and delays in
research and development expenditures by companies in these industries.

     In addition, Molecular Devices' future revenues may be adversely affected
by the ongoing consolidation in the pharmaceutical and biotechnology industries,
which will reduce the number of its potential customers. Furthermore, Molecular
Devices cannot assure you that the pharmaceutical and biotechnology companies
that are its customers will not develop their own competing products or in-house
capabilities.

MOLECULAR DEVICES' PRODUCTS COULD INFRINGE ON THE INTELLECTUAL PROPERTY RIGHTS
OF OTHERS, WHICH MAY CAUSE IT TO ENGAGE IN COSTLY LITIGATION AND, IF MOLECULAR
DEVICES IS NOT SUCCESSFUL, COULD ALSO CAUSE IT TO PAY SUBSTANTIAL DAMAGES AND
PROHIBIT IT FROM SELLING ITS PRODUCTS.

     Third parties may assert infringement or other intellectual property claims
against Molecular Devices. Molecular Devices may have to pay substantial
damages, including treble damages, for past infringement if it is ultimately
determined that its products infringe a third party's proprietary rights.
Further, any legal action against Molecular Devices could, in addition to
subjecting it to potential liability for damages, prohibit Molecular Devices
from selling its products before it obtains a license to do so from the party
owning the intellectual property, which, if available at all, may require
Molecular Devices to pay substantial royalties. Even if these claims are without
merit, defending a lawsuit takes significant time, may be expensive and may
divert management attention from other business concerns. There may be
third-party patents that may relate to Molecular Devices' technology or
potential products. Any public announcements related to litigation or
interference proceedings initiated or threatened against Molecular Devices could
cause its stock price to decline. Molecular Devices believes that there may be
significant litigation in the industry regarding patent and other intellectual
property rights. If Molecular Devices becomes involved in litigation, it could
consume a substantial portion of Molecular Devices' managerial and financial
resources.

MOLECULAR DEVICES MAY NEED TO INITIATE LAWSUITS TO PROTECT OR ENFORCE ITS
PATENTS, WHICH WOULD BE EXPENSIVE AND, IF MOLECULAR DEVICES LOSES, MAY CAUSE IT
TO LOSE SOME OF ITS INTELLECTUAL PROPERTY RIGHTS, WHICH WOULD REDUCE ITS ABILITY
TO COMPETE IN THE MARKET.

     Molecular Devices relies on patents to protect a large part of its
intellectual property and its competitive position. In order to protect or
enforce its patent rights, Molecular Devices may initiate patent litigation
against third parties, such as infringement suits or interference proceedings.
Litigation may be necessary to:

     - assert claims of infringement;

     - enforce its patents;

     - protect its trade secrets or know-how; or

     - determine the enforceability, scope and validity of the proprietary
       rights of others.

                                       21
<PAGE>   30

     Lawsuits could be expensive, take significant time and divert management's
attention from other business concerns. They would put Molecular Devices'
patents at risk of being invalidated or interpreted narrowly and its patent
applications at risk of not issuing. Molecular Devices may also provoke third
parties to assert claims against it. Patent law relating to the scope of claims
in the technology fields in which Molecular Devices operates is still evolving
and, consequently, patent positions in its industry are generally uncertain.
Molecular Devices cannot assure you that it will prevail in any of these suits
or that the damages or other remedies awarded, if any, will be commercially
valuable. During the course of these suits, there may be public announcements of
the results of hearings, motions and other interim proceedings or developments
in the litigation. If securities analysts or investors perceive any of these
results to be negative, it could cause Molecular Devices' stock price to
decline.

THE RIGHTS MOLECULAR DEVICES RELIES UPON TO PROTECT ITS INTELLECTUAL PROPERTY
UNDERLYING ITS PRODUCTS MAY NOT BE ADEQUATE, WHICH COULD ENABLE THIRD PARTIES TO
USE ITS TECHNOLOGY AND WOULD REDUCE ITS ABILITY TO COMPETE IN THE MARKET.

     Molecular Devices' success will depend in part on its ability to obtain
commercially valuable patent claims and to protect its intellectual property.
Molecular Devices' patent position is generally uncertain and involves complex
legal and factual questions. Legal standards relating to the validity and scope
of claims in Molecular Devices' technology field are still evolving. Therefore,
the degree of future protection for Molecular Devices' proprietary rights is
uncertain.


     The risks and uncertainties that Molecular Devices faces with respect to
its patents and other proprietary rights include the following:


     - the pending patent applications Molecular Devices has filed or to which
       Molecular Devices has exclusive rights may not result in issued patents
       or may take longer than Molecular Devices expects to result in issued
       patents;

     - the claims of any patents which are issued may not provide meaningful
       protection;

     - Molecular Devices may not be able to develop additional proprietary
       technologies that are patentable;

     - the patents licensed or issued to Molecular Devices or its customers may
       not provide a competitive advantage;

     - other companies may challenge patents licensed or issued to Molecular
       Devices or its customers;

     - patents issued to other companies may harm Molecular Devices' ability to
       do business;

     - other companies may independently develop similar or alternative
       technologies or duplicate its technologies; and

     - other companies may design around technologies Molecular Devices has
       licensed or developed.


     In addition to patents, Molecular Devices relies on a combination of trade
secrets, nondisclosure agreements and other contractual provisions and technical
measures to protect its intellectual property rights. Nevertheless, these
measures may not be adequate to safeguard the technology underlying its
products. If Molecular Devices does not protect its rights, third parties could
use its technology, and its ability to compete in the market would be reduced.
In addition, employees, consultants and others who participate in the
development of Molecular Devices' products may breach their agreements with
Molecular Devices regarding its intellectual property, and Molecular Devices may
not have adequate remedies for the breach. Molecular Devices also may not be
able to effectively protect its intellectual property rights in some foreign
countries. For a variety of reasons, Molecular Devices may decide not to file
for patent, copyright or trademark protection or prosecute potential
infringements of its patents. Molecular Devices also realizes that its trade
secrets may become known through other means not currently foreseen by Molecular
Devices. Notwithstanding Molecular Devices' efforts to protect its intellectual
property, its competitors or customers may independently develop similar or
alternative


                                       22
<PAGE>   31

technologies or products that are equal or superior to its technology and
products without infringing on any of its intellectual property rights or design
around its proprietary technologies.

MOLECULAR DEVICES OBTAINS SOME OF THE COMPONENTS AND SUBASSEMBLIES INCLUDED IN
ITS SYSTEMS FROM A SINGLE SOURCE OR A LIMITED GROUP OF SUPPLIERS, AND THE
PARTIAL OR COMPLETE LOSS OF ONE OF THESE SUPPLIERS COULD CAUSE PRODUCTION DELAYS
AND A SUBSTANTIAL LOSS OF REVENUE.

     Molecular Devices relies on outside vendors to manufacture many components
and subassemblies. Certain components, subassemblies and services necessary for
the manufacture of its systems are obtained from a sole supplier or limited
group of suppliers, some of which are competitors of Molecular Devices.
Additional components, such as optical, electronic and pneumatic devices, are
currently purchased in configurations specific to Molecular Devices'
requirements and, together with certain other components, such as computers, are
integrated into its products. Molecular Devices maintains only a limited number
of long-term supply agreements with its suppliers.

     Molecular Devices' reliance on a sole or a limited group of suppliers
involves several risks, including the following:

     - it may be unable to obtain an adequate supply of required components;

     - it has reduced control over pricing and the timely delivery of components
       and subassemblies; and

     - its suppliers may be unable to develop technologically advanced products
       to support its growth and development of new systems.

     For example, Molecular Devices currently relies on a single supplier of
disposable plastic tips used with its FLIPR(384) system, and Molecular Devices
has in the past experienced delays and customer dissatisfaction due to its
supplier's inability to deliver an adequate supply of tips. Molecular Devices
cannot predict whether it will encounter additional similar delays in the
future. Molecular Devices' current supplier and known potential alternative
suppliers of disposable plastic tips used with its FLIPR(384) system are
competitors of Molecular Devices.

     Because the manufacturing of certain of these components and subassemblies
involves extremely complex processes and requires long lead times, Molecular
Devices may experience delays or shortages caused by suppliers. Molecular
Devices believes that alternative sources could be obtained and qualified, if
necessary, for most sole and limited source parts. However, if Molecular Devices
was forced to seek alternative sources of supply or to manufacture such
components or subassemblies internally, Molecular Devices may be forced to
redesign its systems, which could prevent it from shipping its systems to
customers on a timely basis. Some of Molecular Devices' suppliers have
relatively limited financial and other resources. Any inability to obtain
adequate deliveries, or any other circumstance that would restrict Molecular
Devices' ability to ship its products, could damage relationships with current
and prospective customers and could harm its business.

MOLECULAR DEVICES MAY ENCOUNTER MANUFACTURING AND ASSEMBLY PROBLEMS OR DELAYS,
WHICH COULD RESULT IN LOST REVENUE.

     Molecular Devices assembles its systems in its manufacturing facilities
located in Sunnyvale, California and Norway. Its manufacturing and assembly
processes are highly complex and require sophisticated, costly equipment and
specially designed facilities. As a result, any prolonged disruption in the
operations of its manufacturing facilities could seriously harm its ability to
satisfy its customer order deadlines. If Molecular Devices cannot deliver its
systems in a timely manner, its revenues will likely suffer.

     Molecular Devices' product sales depend in part upon manufacturing yields.
Molecular Devices currently has limited manufacturing capacity and experiences
variability in manufacturing yields. Molecular Devices is currently
manufacturing high throughput instruments in-house, in limited volumes and with
largely manual assembly. If demand for its high throughput instruments
increases, Molecular

                                       23
<PAGE>   32

Devices will either need to expand its in-house manufacturing capabilities or
outsource to other manufacturers. If Molecular Devices fails to deliver its
products in a timely manner, its relationships with its customers could be
seriously harmed, and revenue would decline.


     As Molecular Devices develops new products, it must transition the
manufacture of a new product from the development stage to commercial
manufacturing. Molecular Devices has only recently transitioned GEMINI XS and
SPECTRAmax PLUS(384) from the development stage to commercial manufacturing, and
Molecular Devices has only recently begun the transition process for the CLIPR
system. Molecular Devices cannot predict whether it will be able to complete
these transitions on a timely basis and with commercially reasonable costs.
Molecular Devices cannot assure that manufacturing or quality control problems
will not arise as it attempts to scale-up its production for any future new
products or that Molecular Devices can scale-up manufacturing and quality
control in a timely manner or at commercially reasonable costs. If Molecular
Devices is unable to consistently manufacture its products on a timely basis
because of these or other factors, its product sales will decline.


MOLECULAR DEVICES MAY HAVE DIFFICULTY MANAGING ITS GROWTH.

     Molecular Devices expects to continue to experience significant growth in
the number of its employees and customers and the scope of its operations. This
growth may continue to place a significant strain on its management and
operations. Molecular Devices' ability to manage this growth will depend upon
its ability to broaden its management team and its ability to attract, hire and
retain skilled employees. Its success will also depend on the ability of its
officers and key employees to continue to implement and improve its operational
and other systems, to manage multiple, concurrent customer relationships and to
hire, train and manage its employees. Molecular Devices' future success is
heavily dependent upon growth and acceptance of new products. If Molecular
Devices cannot scale its business appropriately or otherwise adapt to
anticipated growth and new product introductions, a key part of its strategy may
not be successful.

MOLECULAR DEVICES RELIES ON DISTRIBUTORS FOR PRODUCT SALES AND SUPPORT OUTSIDE
NORTH AMERICA.

     In 1999 approximately 17% of Molecular Devices' sales were made through
distributors. Molecular Devices often relies upon distributors to provide
customer support to the ultimate end users of its products. As a result, its
success depends on the continued sales and customer support efforts of its
network of distributors. The use of distributors involves certain risks,
including risks that distributors will not effectively sell or support its
products, that they will be unable to satisfy financial obligations to Molecular
Devices and that they will cease operations. Any reduction, delay or loss of
orders from its significant distributors could harm its revenues. Molecular
Devices also does not currently have distributors in a number of significant
international markets that it has targeted and will need to establish additional
international distribution relationships. There can be no assurance that
Molecular Devices will engage qualified distributors in a timely manner, and the
failure to do so could have a material adverse effect on its business, financial
condition and results of operations.

IF MOLECULAR DEVICES CHOOSES TO ACQUIRE NEW AND COMPLEMENTARY BUSINESSES,
PRODUCTS OR TECHNOLOGIES INSTEAD OF DEVELOPING THEM ITSELF, MOLECULAR DEVICES
MAY BE UNABLE TO COMPLETE THESE ACQUISITIONS OR MAY NOT BE ABLE TO SUCCESSFULLY
INTEGRATE AN ACQUIRED BUSINESS OR TECHNOLOGY IN A COST-EFFECTIVE AND NON-
DISRUPTIVE MANNER.

     Molecular Devices' success depends on its ability to continually enhance
and broaden its product offerings in response to changing technologies, customer
demands and competitive pressures. To this end, from time to time Molecular
Devices has acquired complementary businesses, products, or technologies instead
of developing them itself and may choose to do so in the future. Molecular
Devices does not know if it will be able to complete any acquisitions, or
whether Molecular Devices will be able to successfully integrate any acquired
business, operate it profitably or retain its key employees. Integrating any
business, product or technology Molecular Devices acquires could be expensive
and time consuming, disrupt its ongoing business and distract its management. In
addition, in order to finance any acquisitions, Molecular
                                       24
<PAGE>   33

Devices might need to raise additional funds through public or private equity or
debt financings. In that event, Molecular Devices could be forced to obtain
financing on terms that are not favorable to it and, in the case of equity
financing, that may result in dilution to its stockholders. If Molecular Devices
is unable to integrate any acquired entities, products or technologies
effectively, its business will suffer. In addition, any amortization of goodwill
or other assets or charges resulting from the costs of acquisitions could harm
its business and operating results.

MOLECULAR DEVICES DEPENDS ON KEY PERSONNEL, THE LOSS OF WHOM WOULD IMPAIR ITS
ABILITY TO COMPETE.

     Molecular Devices is highly dependent on the principal members of its
management, engineering and scientific staff. The loss of the service of any of
these persons could seriously harm its product development and commercialization
efforts. In addition, research, product development and commercialization will
require additional skilled personnel in areas such as chemistry and biology,
software engineering and electronic engineering. Its corporate headquarters is
located in Sunnyvale, California, where demand for personnel with these skills
is extremely high and is likely to remain high. As a result, competition for and
retention of personnel, particularly for employees with technical expertise, is
intense and the turnover rate for these people is high. If Molecular Devices is
unable to hire, train and retain a sufficient number of qualified employees, its
ability to conduct and expand its business could be seriously reduced. The
inability to retain and hire qualified personnel could also hinder the planned
expansion of its business.

MOLECULAR DEVICES IS DEPENDENT ON INTERNATIONAL SALES AND OPERATIONS, WHICH
EXPOSES IT TO FOREIGN CURRENCY EXCHANGE RATE, POLITICAL AND ECONOMIC RISKS.

     Molecular Devices maintains facilities in Norway, the United Kingdom and
Germany, and sales to customers outside the U.S. accounted for approximately 39%
of its revenues in 1999. Molecular Devices anticipates that international sales
will continue to account for a significant portion of its revenues.

     All of Molecular Devices' sales to international distributors are
denominated in U.S. dollars. All of its direct sales in the United Kingdom,
Germany and Canada are denominated in local currencies and totaled $13.8 million
(22% of total revenues) in 1999. To the extent that its sales and operating
expenses are denominated in foreign currencies, its operating results may be
adversely affected by changes in exchange rates. Historically, foreign exchange
gains and losses have been immaterial to Molecular Devices' results of
operations. However, Molecular Devices cannot predict whether these gains and
losses will continue to be immaterial, particularly as Molecular Devices
increases its direct sales outside North America. Owing to the number of
currencies involved, the substantial volatility of currency exchange rates, and
its constantly changing currency exposures, Molecular Devices cannot predict the
effect of exchange rate fluctuations on its future operating results. Molecular
Devices does not engage in foreign currency hedging transactions.

     Molecular Devices' reliance on international sales and operations exposes
it to foreign political and economic risks, including:

     - political, social and economic instability;

     - trade restrictions and changes in tariffs;

     - import and export license requirements and restrictions;

     - difficulties in staffing and managing international operations;

     - disruptions in international transport or delivery;

     - difficulties in collecting receivables; and

     - potentially adverse tax consequences.

If any of these risks materialize, Molecular Devices' international sales could
decrease and its foreign operations could suffer.

                                       25
<PAGE>   34

MOLECULAR DEVICES' OPERATING RESULTS FLUCTUATE AND ANY FAILURE TO MEET FINANCIAL
EXPECTATIONS MAY DISAPPOINT SECURITIES ANALYSTS OR INVESTORS AND RESULT IN A
DECLINE IN ITS STOCK PRICE.


     Molecular Devices typically experiences a decrease in the level of sales in
the first calendar quarter as compared to the fourth quarter of the preceding
year because of budgetary and capital equipment purchasing patterns in the life
sciences industry. Molecular Devices also typically experiences a decrease in
revenues in the third quarter compared to the second quarter, related to
seasonality primarily associated with lower European and academic sales during
the summer months. See also "The recent issuance by the SEC of an accounting
bulletin related to revenue recognition, SAB 101, may have a material adverse
impact on Molecular Devices' financial performance" above.


     Molecular Devices' quarterly operating results have fluctuated in the past,
and Molecular Devices expects they will fluctuate in the future as a result of
many factors, some of which are outside of its control. In particular, if sales
levels in a particular quarter do not meet expectations, Molecular Devices may
not be able to adjust operating expenses sufficiently quickly to compensate for
the shortfall, and its results of operations for that quarter may be seriously
harmed. Molecular Devices manufactures its products based on forecasted orders
rather than to outstanding orders. Molecular Devices' manufacturing procedures
may in certain instances create a risk of excess or inadequate inventory levels
if orders do not match forecasts. In addition, its expense levels are based, in
part, on expected future sales, and Molecular Devices generally cannot quickly
adjust operating expenses. For example, research and development and general and
administrative expenses are not affected directly by variations in revenue.

     It is possible that in some future quarter or quarters, its operating
results will be below the expectations of securities analysts or investors. In
this event, the market price of its common stock may fall abruptly and
significantly. Because its revenue and operating results are difficult to
predict, Molecular Devices believes that period-to-period comparisons of its
results of operations are not a good indication of its future performance.

MOLECULAR DEVICES' STOCK PRICE IS VOLATILE, WHICH COULD CAUSE INVESTORS TO LOSE
A SUBSTANTIAL PART OF THEIR INVESTMENT IN ITS STOCK.

     The stock market in general, and the stock prices of technology companies
in particular, have recently experienced volatility which has often been
unrelated to the operating performance of any particular company or companies.
Molecular Devices' stock price could decline regardless of its actual operating
performance, and investors could lose a substantial part of their investment as
a result of industry or market-based fluctuations. In the past, its stock has
traded relatively thinly. If a more active public market for its stock is not
sustained following the merger, it may be difficult for stockholders to resell
shares of its common stock. Because Molecular Devices does not anticipate paying
cash dividends on its common stock for the foreseeable future, stockholders will
not be able to receive a return on their shares unless they sell them.

THE MARKET PRICE OF MOLECULAR DEVICES' COMMON STOCK WILL LIKELY FLUCTUATE IN
RESPONSE TO A NUMBER OF FACTORS, INCLUDING THE FOLLOWING:

     - Molecular Devices' failure to meet the performance estimates of
       securities analysts;

     - changes in financial estimates of its revenues and operating results or
       buy/sell recommendations by securities analysts;

     - the timing of announcements by Molecular Devices or its competitors of
       significant products, contracts or acquisitions or publicity regarding
       actual or potential results or performance thereof; and

     - general stock market conditions, other economic or external factors.

                                       26
<PAGE>   35

PROVISIONS OF MOLECULAR DEVICES' CHARTER DOCUMENTS AND DELAWARE LAW MAY INHIBIT
A TAKEOVER, WHICH COULD LIMIT THE PRICE INVESTORS MIGHT BE WILLING TO PAY IN THE
FUTURE FOR ITS COMMON STOCK.


     Provisions in Molecular Devices' certificate of incorporation and bylaws
may have the effect of delaying or preventing an acquisition or merger in which
Molecular Devices is not the surviving company or changes in its management. For
example, its certificate of incorporation gives the Molecular Devices board of
directors the authority to issue shares of preferred stock and to determine the
price, rights, preferences and privileges and restrictions, including voting
rights, of those shares without any further vote or action by its stockholders.
The rights of the holders of common stock will be subject to, and may be harmed
by, the rights of the holders of any shares of preferred stock that may be
issued in the future. The issuance of preferred stock may delay, defer or
prevent a change in control, as the terms of the preferred stock that might be
issued could potentially prohibit its consummation of any merger,
reorganization, sale of substantially all of its assets, liquidation or other
extraordinary corporate transaction without the approval of the holders of the
outstanding shares of preferred stock. The issuance of preferred stock could
also have a dilutive effect on its stockholders. In addition, because Molecular
Devices is incorporated in Delaware, it is governed by the provisions of Section
203 of the Delaware General Corporation Law. These provisions may prohibit large
stockholders, in particular those owning 15% or more of the outstanding voting
stock, from consummating a merger or combination involving Molecular Devices.
These provisions could limit the price that investors might be willing to pay in
the future for its common stock.


THE ACTUAL RESULTS OF MOLECULAR DEVICES COULD DIFFER MATERIALLY FROM THOSE
ANTICIPATED IN ITS FORWARD-LOOKING STATEMENTS.


     This prospectus, including the documents that Molecular Devices
incorporates by reference, contains forward-looking statements within the
meaning of the federal securities laws that relate to future events or Molecular
Devices' future financial performance. When used in this prospectus, you can
identify forward-looking statements by terminology such as "anticipate,"
"believe," "continue," "estimate," "expect," "intend," "may," "plan,"
"potential," "predict," "should," "will" and the negative of these terms or
other comparable terminology. These statements are only predictions. The actual
results of Molecular Devices could differ materially from those anticipated in
its forward-looking statements as a result of many factors, including those set
forth here under "Risk Factors" and elsewhere in this joint proxy
statement/prospectus.



     Although Molecular Devices believes that the expectations reflected in its
forward-looking statements are reasonable, it cannot guarantee future results,
levels of activity, performance or achievements. Neither Molecular Devices nor
any other person assumes responsibility for the accuracy and completeness of
these statements. Molecular Devices assumes no duty to update any of the
forward-looking statements after the date of this joint proxy
statement/prospectus or to conform these statements to actual results.


RISKS RELATING TO LJL BIOSYSTEMS

SINCE ADOPTING ITS CURRENT BUSINESS STRATEGY IN 1996, LJL BIOSYSTEMS HAS
CONSISTENTLY HAD OPERATING LOSSES; THE MARKET FOR LJL BIOSYSTEMS' PRODUCTS IS
RELATIVELY NEW AND UNDEFINED, AND LJL BIOSYSTEMS MAY NEVER ACHIEVE
PROFITABILITY.

     LJL BioSystems began implementing its current strategic business model to
develop products for the high throughput market in 1996 and began targeting the
SNP genotyping market in 1999. In connection with this change in strategy, LJL
BioSystems shifted its focus from developing and manufacturing clinical
diagnostic and research products on an original equipment manufacturing basis to
developing, manufacturing and marketing products for the high throughput market.
As a result, LJL BioSystems' historical operating and financial performance is
generally not indicative of future financial and business results. LJL
BioSystems incurred operating losses for the quarter ended March 31, 2000 and
the years ended December 31, 1999, 1998 and 1997 as a result of its change in
business strategy and anticipates that it may continue to incur losses for at
least the next several years due to the substantial increases in expenditures
necessary to continue to develop and commercialize its product line. LJL
BioSystems began commercial shipments of its first high throughput instrument,
the Analyst HT, in the second quarter of

                                       27
<PAGE>   36

1998, began commercial shipments of its ultra-high throughput product, Acquest,
in the fourth quarter of 1998 and began commercial shipments of its Analyst AD
instrument in June 1999. Accordingly, LJL BioSystems is subject to the risks
inherent in the operation of a new business, such as failure to:

     - develop effective sales, marketing and distribution channels;

     - achieve market acceptance and demand for its product line;

     - effectively service and maintain the product line;

     - implement commercial scale-up of developed products; and

     - attract and retain key personnel.

     Furthermore, LJL BioSystems' target markets are relatively new and the use
of high throughput products by pharmaceutical, biotechnology and genomics
companies is still developing. Demand for LJL BioSystems' products will depend
upon the extent to which its customers adopt high throughput analysis as a drug
discovery tool. If high throughput analysis does not become widely used, demand
for LJL BioSystems' products will not develop as LJL BioSystems currently
expects or at all. The lack of demand for LJL BioSystems' product line would
have a material adverse effect on its business, financial condition and results
of operations.

BECAUSE LJL BIOSYSTEMS IS IN THE EARLY STAGE OF DEVELOPMENT OF CERTAIN
INSTRUMENTS, ITS ABILITY TO DEVELOP AND COMMERCIALIZE THESE PRODUCTS IS
UNCERTAIN.

     The success of LJL BioSystems will depend on its ability to develop and
commercialize its instruments. LJL BioSystems began commercial shipments of its
first high throughput instrument, the Analyst HT, in the second quarter of 1998.
LJL BioSystems began commercial shipments of its ultra-high throughput product,
Acquest, in the fourth quarter of 1998 and began commercial shipments of its
Analyst AD instrument in June 1999. LJL BioSystems had not previously developed
or commercialized products for the high throughput market before this time. LJL
BioSystems is also developing new technologies for its product line, such as
FLARe and ScreenStation. The successful development and commercialization of LJL
BioSystems' product line, including the new technologies and products currently
being developed, is a complex process requiring the integration and maintenance
of, among other technologies: advanced optics, electronics, automation and
robotics, microfluidics, fluorescence detector technologies, software and
information systems, biophysics, biology and chemistry.

     Even if LJL BioSystems' current and future products appear promising at
commercial launch, they may not achieve market acceptance at a level necessary
to enable production at a reasonable cost, to support the required sales and
marketing effort, to cost-effectively service and maintain, and to support
continuing research and development costs. In addition, LJL BioSystems' product
line instruments may:

     - be difficult or overly expensive to produce;

     - fail to achieve performance levels expected by customers;

     - have a price level that is unacceptable in its targeted industries; or

     - be precluded from commercialization by the proprietary rights of others
       or other competitive forces.

     LJL BioSystems may not be able to successfully manufacture and market its
products on a timely basis, achieve anticipated performance levels or
throughputs, gain and maintain industry acceptance of its products or develop a
profitable business. The failure to achieve any of these objectives would have a
material adverse effect on LJL BioSystems' business, financial condition and
results of operations.

BECAUSE LJL BIOSYSTEMS IS IN THE EARLY STAGE OF DEVELOPMENT, ITS ABILITY TO
DEVELOP AND COMMERCIALIZE CONSUMABLES IS UNCERTAIN.

     LJL BioSystems expects in the future that a substantial portion of its
revenues may be derived from the sale of reagents, assay kits and microplates.
LJL BioSystems has limited experience in the
                                       28
<PAGE>   37

development, manufacture and marketing of reagents, assay kits and microplates,
having only manufactured and sold a limited number of assay kits and HE
microplates. LJL BioSystems intends to continue to license assay technologies
from third parties and to develop reagents, assay kits and microplates
internally. LJL BioSystems may not succeed in licensing any additional assay
technologies on acceptable terms, if at all, and it may not successfully
commercialize any assay technologies that it licenses. In addition, LJL
BioSystems is internally developing reagents, assay kits and microplates, but
has limited experience in this area. LJL BioSystems may not successfully develop
additional reagents, assay kits or microplates internally, and any reagents,
assay kits or microplates it does develop may not achieve market acceptance. LJL
BioSystems intends to outsource the manufacture of microplates and, as sales
volumes increase, to also outsource the manufacture of reagents and assay kits.
LJL BioSystems may not be able to enter into agreements with third parties for
the manufacture of reagents, assay kits or microplates on terms commercially
acceptable to it or at all. In addition, LJL BioSystems intends to sell
reagents, assay kits and microplates to purchasers of its instruments, including
the Analyst HT, Analyst AD and Acquest. Sales of the Analyst HT, Analyst AD and
Acquest may not be sufficient to support this strategy. A failure to achieve
commercial acceptance of LJL BioSystems' reagents, assay kits and microplates
would have a material adverse effect on its business, financial condition and
results of operations.

BECAUSE LJL BIOSYSTEMS DEPENDS ON DEVELOPING TECHNOLOGIES AND ITS MARKETS ARE
SUBJECT TO RAPID TECHNOLOGICAL CHANGE, LJL BIOSYSTEMS MAY NOT BE ABLE TO
COMMERCIALIZE ITS PRODUCTS.

     The pharmaceutical, biotechnology and genomics instrumentation and reagents
markets are characterized by rapid technological change and frequent new product
introductions by many competitors. LJL BioSystems' targeted markets are in early
stages of development and may not grow as LJL BioSystems currently anticipates,
which would significantly reduce the market potential for its products. In
addition, LJL BioSystems' future success will depend on its ability to enhance
and maintain its current and planned product line and to develop and introduce,
on a timely basis, new technologies and products that address the evolving needs
of LJL BioSystems' customers. These new technologies and products include but
are not limited to fluorescence-based reagents and assay kits, products based on
LJL BioSystems' ScreenStation, HEFP, FLARe and SmartOptics technologies, as well
as future additions to its SNP genotyping platform. Development of these new
technologies subjects LJL BioSystems to significant risks and uncertainties, as
it may encounter unanticipated technical issues that may cause development
delays. These technical issues may require LJL BioSystems to cancel such
development programs altogether, if it is unable to find solutions to these
issues. Even if development is successful, LJL BioSystems anticipates that
production units for these new products may not be available for several months
or years, if at all. The production of instruments and consumables may present
manufacturing challenges. LJL BioSystems may experience difficulties that could
delay or prevent the successful manufacturing, introduction and marketing of its
new products or product enhancements. Any failure to manufacture and introduce
products in a timely manner in response to changing market demands or customer
requirements could have a material adverse effect on LJL BioSystems' business,
financial condition and results of operations.

LJL BIOSYSTEMS HAS LIMITED SALES, MARKETING AND SERVICE EXPERIENCE AND MAY NOT
BE ABLE TO DEVELOP A DIRECT SALES AND SERVICE FORCE OR DISTRIBUTION CHANNELS
THAT CAN MEET ITS CUSTOMERS' NEEDS.

     LJL BioSystems has limited experience in direct marketing, sales, service
and distribution. LJL BioSystems' future profitability will depend on its
ability to further develop a direct sales and service force to sell and maintain
its product line. LJL BioSystems' products are technical in nature and it
therefore believes it is necessary to develop a direct sales and service force
consisting of people with scientific backgrounds and expertise. Competition for
such employees is intense. LJL BioSystems may not be able to attract and retain
sufficient numbers of qualified sales and service personnel or be able to build
an efficient and effective sales, support and marketing organization. Failure to
attract or retain qualified sales and service personnel or to build such a
sales, support and marketing organization would have a material adverse effect
on LJL BioSystems' business, financial condition and results of operations.
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<PAGE>   38

     LJL BioSystems is marketing its product line in certain international
markets through distributors. While LJL BioSystems currently has two
distributors in international markets, one in Japan and another with the
territory of Belgium, Netherlands and Luxembourg, there can be no assurance that
LJL BioSystems will be able to engage additional qualified distributors. Such
distributors may:

     - fail to satisfy financial or contractual obligations to LJL BioSystems;

     - fail to adequately market LJL BioSystems' products;

     - cease operations with little or no notice to LJL BioSystems; or

     - offer, design, manufacture or promote competing product lines.

     The failure to develop and maintain effective distribution channels could
have a material adverse effect on LJL BioSystems' business, financial condition
and results of operations.

LJL BIOSYSTEMS PARTICIPATES IN A HIGHLY COMPETITIVE MARKET AND ITS PRODUCTS MAY
NOT BE ACCEPTED IN THE MARKET.

     The market for high throughput products for drug discovery and SNP
genotyping is highly competitive. LJL BioSystems anticipates that competition
will increase significantly as more customers adopt high throughput tools for
drug discovery and SNP genotyping, and as competitors enter the market with new
advanced technologies and products. LJL BioSystems is competing in many areas,
including high throughput instruments, assay development, consumables and
reagent sales. LJL BioSystems competes with companies that directly market high
throughput products. In addition, pharmaceutical and biotechnology companies,
academic institutions, governmental agencies and other research organizations
are conducting research and developing products in various areas which compete
with LJL BioSystems' technology platform, either on their own or in
collaboration with others. As a result, LJL BioSystems' potential customers may
choose not to purchase its products. LJL BioSystems' potential customers may
assemble and run high throughput systems by purchasing products from competitors
or making their own. Further, certain companies offer screening and genotyping
services on a contract or collaborative basis, and these services could
eliminate the need for a potential customer to purchase LJL BioSystems'
products. LJL BioSystems' technological approaches may be rendered obsolete or
uneconomical by advances in existing technological approaches or the development
of different approaches by one or more of its current or future competitors.
Many of these competitors have greater financial and personnel resources, and
more experience in research and development, sales and marketing and other areas
than LJL BioSystems.

THE MARKET FOR LJL BIOSYSTEMS' PRODUCT LINE IS CONCENTRATED, WHICH LIMITS THE
NUMBER OF ITS POTENTIAL CUSTOMERS.

     LJL BioSystems currently markets its product line to pharmaceutical,
biotechnology and genomics companies, as well as academic institutions; however,
LJL BioSystems' primary marketing efforts and the majority of its sales are to
pharmaceutical companies. LJL BioSystems' market for high throughput and
ultra-high throughput products is highly concentrated, with approximately 50
large pharmaceutical companies operating a substantial portion of its targeted
drug discovery laboratories. In the quarter ended March 31, 2000, sales to a
single customer accounted for 12% of LJL BioSystems' revenues. LJL BioSystems
expects a relatively small number of customers will continue to account for a
substantial portion of its revenues. LJL BioSystems faces risks associated with
a highly concentrated customer base to which it sells its product line,
including the failure to establish or maintain relationships within a limited
customer pool, or substantial financial difficulties or decreased capital
spending by its customers, any of which could have a material adverse effect on
LJL BioSystems' business, financial condition and results of operations.

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<PAGE>   39

LJL BIOSYSTEMS' PRODUCTS HAVE LENGTHY SALES CYCLES, WHICH COULD CAUSE ITS
OPERATING RESULTS TO FLUCTUATE SIGNIFICANTLY FROM QUARTER TO QUARTER.

     The sale of LJL BioSystems' product line typically involves a significant
technical evaluation and commitment of capital by customers. Accordingly, the
sales cycle associated with LJL BioSystems' products is expected to be lengthy
and subject to a number of significant risks, including seasonality, customers'
budgetary constraints and internal acceptance reviews, that are beyond LJL
BioSystems' control. Due to this lengthy and unpredictable sales cycle, LJL
BioSystems' operating results could fluctuate significantly from quarter to
quarter.

IF LJL BIOSYSTEMS' CUSTOMERS ARE UNABLE TO ADEQUATELY PREPARE SAMPLES AS
REQUIRED BY ITS INSTRUMENTS, THE OVERALL MARKET DEMAND FOR ITS PRODUCTS MAY
DECLINE.

     Before using LJL BioSystems' instruments, customers must prepare assays by
following several steps that are prone to human error. If assays are not
prepared appropriately, LJL BioSystems' instruments will not generate a useful
reading. If LJL BioSystems' customers experience these difficulties, they may
achieve lower levels of throughput or accuracy than those for which LJL
BioSystems' instruments were designed. If LJL BioSystems' customers are unable
to generate expected levels of throughput or accuracy, they may not continue to
purchase LJL BioSystems' products and they may express their discontent with its
products in the marketplace. Any or all of these actions would reduce the
overall market demand for LJL BioSystems' products.


LJL BIOSYSTEMS HAS LIMITED MANUFACTURING EXPERIENCE AND MAY NOT BE ABLE TO SCALE
UP ITS MANUFACTURING OPERATIONS TO COMMERCIAL LEVELS.


     LJL BioSystems is producing certain of its products in limited quantities,
and has not yet manufactured other products and reagents and assay kits in
significant quantities. LJL BioSystems may encounter difficulties in scaling up
production of its product line due to, among other things, quality control and
assurance, component supply and availability of qualified personnel. Even if LJL
BioSystems successfully develops and introduces its products to market, LJL
BioSystems may not be able to manufacture or support them in sufficient
quantities at acceptable cost while meeting quality control standards. LJL
BioSystems intends to outsource the manufacture of microplates and, as sales
volumes increase, to evaluate outsourcing the manufacture of reagents and assay
kits. Difficulties encountered in the manufacturing scale-up of other products
in LJL BioSystems' product line could have a material adverse effect on its
business, financial condition and results of operations.

LJL BIOSYSTEMS MAY NOT SUCCESSFULLY MANAGE ITS GROWTH.

     LJL BioSystems' success will depend on the expansion of its operations and
the effective management of growth, which will place a significant strain on its
management, operational and financial resources. To manage such growth, LJL
BioSystems must expand its facilities, augment its operational, financial and
management systems and hire and train additional qualified personnel. LJL
BioSystems' failure to manage growth effectively would have a material adverse
effect on its business, financial condition and results of operations.

LJL BIOSYSTEMS DEPENDS UPON KEY PERSONNEL WHO MAY TERMINATE THEIR EMPLOYMENT
WITH IT AT ANY TIME; LJL BIOSYSTEMS NEEDS TO HIRE ADDITIONAL QUALIFIED
PERSONNEL.

     LJL BioSystems' success will depend to a significant degree upon the
continued services of key management, technical and scientific personnel,
including Lev J. Leytes, the Chairman of its Board of Directors, President and
Chief Executive Officer. In addition, LJL BioSystems' success will depend on its
ability to attract and retain other highly skilled personnel. Competition for
qualified personnel is intense, and the process of hiring such qualified
personnel is often lengthy. There can be no assurance that LJL BioSystems can
recruit such personnel on a timely basis, if at all. LJL BioSystems' management
and other employees may voluntarily terminate their employment with it at any
time. The loss of the services of key

                                       31
<PAGE>   40

personnel, or the inability to attract and retain additional qualified
personnel, could have a material adverse effect on LJL BioSystems' business,
financial condition and results of operations.

BECAUSE LJL BIOSYSTEMS DEPENDS ON SUPPLIERS AND CONTRACT MANUFACTURERS, LJL
BIOSYSTEMS IS SUBJECT TO RISKS BEYOND ITS CONTROL.

     Certain components used in LJL BioSystems' product line are currently
purchased from a single or a limited number of outside sources. The reliance on
a sole or limited number of suppliers could result in:

     - delays associated with redesigning a product due to a failure to obtain a
       single source component;

     - an inability to obtain an adequate supply of required components; and

     - reduced control over pricing, quality and timely delivery.

     LJL BioSystems does not maintain long-term agreements with any of its
suppliers, and therefore the supply of a particular component could be
terminated at any time without penalty to the supplier. Any interruption in the
supply of single source components could have a material adverse effect on LJL
BioSystems' business, financial condition and results of operations. LJL
BioSystems intends to rely on contract manufacturers, some of which may be
single source vendors, for the development, manufacture and supply of certain of
its reagents, assay kits and microplates. There can be no assurance that LJL
BioSystems will be able to enter into such manufacturing contracts on
commercially reasonable terms, if at all, or that LJL BioSystems' current or
future contract manufacturers will meet its requirements for quality, quantity
or timeliness. If the supply of any components, reagents, assay kits or
microplates is interrupted, components, reagents, assay kits and microplates
from alternative suppliers and contract manufacturers may not be available in
sufficient volumes within required timeframes, if at all, to meet LJL
BioSystems' production needs.

IF LJL BIOSYSTEMS' PRODUCTS ARE NOT PROPERLY USED OR IF THEY CONTAIN DEFECTS,
THEY MAY SUBJECT LJL BIOSYSTEMS TO PRODUCT LIABILITY CLAIMS, COSTLY REPAIRS AND
PRODUCT RETURNS.

     LJL BioSystems' products include complex components, including high voltage
and moving parts, which must be properly used and may contain defects. Defects
may occur despite LJL BioSystems' testing and may not be discovered until after
a product has been shipped and used by LJL BioSystems' customers. For example,
LJL BioSystems recently discovered that a component provided by one of its
suppliers which is used in the power supply for certain of LJL BioSystems'
products may fail, which could cause instrument failure and, if the product is
not used properly in the presence of combustible materials, could cause
significant property damage or personal injury. Even without defects, LJL
BioSystems' products could present significant risks for customers if they are
not properly used. This risk associated with the use of LJL BioSystems'
products, together with the possibility of defects, could result in product
liability claims, costly repairs, product returns, and, more generally, delayed
market acceptance of LJL BioSystems' products or damage to its reputation and
business. In addition, defense against any claims, regardless of their merit,
could result in substantial expense to LJL BioSystems, divert management time
and attention, damage its business reputation and hurt its ability to retain
existing customers or attract new customers.

LJL BIOSYSTEMS HAS AN ACCUMULATED DEFICIT AND ITS FUTURE PROFITABILITY IS
UNCERTAIN.

     As of March 31, 2000, LJL BioSystems had an accumulated deficit of
approximately $22.7 million. The expansion of LJL BioSystems' operations and
continued development of its product line will require a substantial increase in
sales, marketing and research and development expenditures for at least the next
several years. As a result, LJL BioSystems expects to incur operating losses for
the next several years. LJL BioSystems' future profitability will depend on its
ability to successfully develop, support and commercialize its product line.
Accordingly, the extent of future losses and the time required to achieve
profitability, if achieved at all, is highly uncertain. Moreover, if
profitability is achieved, the level of such profitability cannot be predicted
and may vary significantly from quarter to quarter.

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<PAGE>   41

LJL BIOSYSTEMS MAY NEED TO RAISE CAPITAL IN THE FUTURE AND ADDITIONAL FUNDING IS
UNCERTAIN.

     LJL BioSystems may be required to raise substantial additional capital over
a period of several years in order to develop and commercialize its products.
LJL BioSystems' future capital requirements will depend on numerous factors,
including the costs associated with:

     - developing and commercializing its products;

     - developing a direct marketing, service and sales force;

     - maintaining existing, or entering into future, licensing and distribution
       agreements;

     - protecting intellectual property rights;

     - expanding its reagents and assay kits business;

     - broadening its product lines to include genotyping of SNPs;

     - expanding facilities and administrative infrastructure; and

     - consummating possible future acquisitions of technologies, products or
       businesses.

     LJL BioSystems may consume available resources more rapidly than currently
anticipated, resulting in the need for additional funding. Accordingly, LJL
BioSystems may be required to raise additional capital through a variety of
sources, including the public equity market, private equity financing,
collaborative arrangements, and public or private debt. Additional capital may
not be available on acceptable terms, if at all. If adequate funds are not
available, LJL BioSystems may be required to significantly reduce or refocus its
operations or to obtain funds through arrangements that may require LJL
BioSystems to relinquish rights to certain of its products, technologies or
potential markets, which would have a material adverse effect on its business,
financial condition and results of operations. To the extent that additional
capital is raised through the sale of equity or convertible securities, the
issuance of such securities would result in ownership dilution to LJL
BioSystems' existing stockholders.

LJL BIOSYSTEMS HAS INTERNATIONAL SALES AND OPERATIONS, WHICH SUBJECT IT TO RISKS
RELATED TO FOREIGN CURRENCY EXCHANGE RATES, TARIFFS, FOREIGN REGULATIONS, IMPORT
AND EXPORT RESTRICTIONS AND DIFFICULTIES MANAGING AND STAFFING INTERNATIONAL
OPERATIONS.

     LJL BioSystems sells products in foreign countries in local currencies,
which exposes it to foreign currency exchange risk. The U.S. dollar is the
functional currency for LJL BioSystems' U.K. subsidiary; however, LJL BioSystems
does enter into transactions in currencies other than the U.S. dollar or pound
sterling. Monetary and non-monetary assets and liabilities of LJL BioSystems'
U.K. subsidiary are remeasured into U.S. dollars at period end and historical
exchange rates, respectively. Sales and expenses are remeasured at average
exchange rates in effect during each period, except for those expenses related
to non-monetary assets, which are remeasured at historical exchange rates. Gains
or losses from foreign currency transactions are included in net income (loss)
and to date have not been material. LJL BioSystems has not entered into any
currency hedging activities but may choose to do so in the future.

     LJL BioSystems expects that international sales could account for a
significant portion of its total sales in the future. International sales and
operations are subject to a number of risks, including:

     - the imposition of government controls;

     - export license requirements;

     - restrictions on the export of critical technology;

     - political and economic instability or conflicts;

     - trade restrictions;

     - changes in tariffs and taxes;

                                       33
<PAGE>   42

     - difficulties in staffing and managing international operations;

     - problems in establishing or managing distributor relationships; and

     - general economic conditions.

     In addition, as LJL BioSystems expands its international operations and the
amount of sales invoiced in local currencies becomes a larger portion of its
business, fluctuations in the value of foreign currencies relative to the U.S.
dollar may adversely affect LJL BioSystems' business, financial condition and
results of operations.

LJL BIOSYSTEMS MAY ACQUIRE TECHNOLOGIES, PRODUCTS AND BUSINESSES, WHICH COULD
EXPOSE IT TO ADDITIONAL RISKS AND BE DILUTIVE TO EXISTING STOCKHOLDERS.

     LJL BioSystems may acquire certain technologies, products or businesses to
broaden the scope of its existing and planned product lines and technologies.
Such acquisitions would expose LJL BioSystems to:

     - the risks associated with the assimilation of new technologies,
       operations, sites and personnel;

     - the diversion of resources from its existing business and technologies;

     - the inability to generate revenues to offset associated acquisition
       costs;

     - the requirement to maintain uniform standards, controls, and procedures;
       and

     - the impairment of relationships with employees and customers as a result
       of any integration of new management personnel.

     Acquisitions may also result in the issuance of dilutive equity securities,
the incurrence or assumption of debt or additional expenses associated with the
amortization of acquired intangible assets or potential businesses. LJL
BioSystems' failure to successfully address such risks could have a material
adverse effect on its business, financial condition and results of operations.

THIRD PARTY INTELLECTUAL PROPERTY RIGHTS MAY LIMIT LJL BIOSYSTEMS' ABILITY TO
DEVELOP, SUPPORT AND SELL LJL BIOSYSTEMS' PRODUCTS; LJL BIOSYSTEMS HAS LICENSED
TECHNOLOGY THAT IT USES IN ITS PRODUCTS, BUT LJL BIOSYSTEMS COULD LOSE RIGHTS TO
THIS TECHNOLOGY AND THE ABILITY TO SELL AND SUPPORT ITS PRODUCTS.

     LJL BioSystems' success will depend in part on its ability to obtain
patents, maintain trade secret protection and operate without infringing the
proprietary rights of others. As of March 31, 2000, LJL BioSystems held seven
U.S. patents and had fourteen pending U.S. patent applications, two pending
European regional patent applications, one pending Israeli patent application,
one pending Japanese patent application, fourteen pending PCT, or international,
patent applications, and twenty-four pending U.S. provisional patent
applications. To supplement its proprietary technology, LJL BioSystems has
licensed, and expects to continue to license from time to time, certain patent
rights from third parties. These licenses may be terminated under certain
circumstances, including a material breach by LJL BioSystems. Furthermore, under
some of these agreements, the licensors may elect to convert the exclusive
rights into non-exclusive rights in the event that LJL BioSystems fails to make
certain minimum royalty payments. If these licenses are terminated due to a
material breach of the license by LJL BioSystems or otherwise, then LJL
BioSystems would lose the right to incorporate the licensed technology into its
products, which would require LJL BioSystems to exclude this certain technology
from its existing and future products and either license or internally develop
alternative technologies. There can be no assurance that LJL BioSystems would be
able to license alternative technologies on commercially acceptable terms, or at
all, or that LJL BioSystems would be capable of internally developing such
technologies. Furthermore, other companies may independently develop technology
with functionality similar or superior to the licensed technology that does not
or is claimed not to infringe the licensed patents or that otherwise circumvents
the technology LJL BioSystems has licensed.

     LJL BioSystems is aware of third party patents that contain issued claims
that may cover certain aspects of its reagent technologies. In the future LJL
BioSystems may be required to license third-party
                                       34
<PAGE>   43

patents to produce or sell certain reagents, assay kits and related products.
Licenses for such patents may not be available on commercially acceptable terms,
if at all. Any action against LJL BioSystems claiming damages and seeking to
enjoin commercial activities relating to the affected technologies could subject
LJL BioSystems to potential liability for damages. LJL BioSystems could incur
substantial costs in defending patent infringement claims, obtaining patent
licenses, engaging in interference and opposition proceedings or other
challenges to its patent rights or intellectual property rights made by third
parties, or in bringing such proceedings or enforcing any patent rights against
third parties. LJL BioSystems' inability to obtain necessary licenses or its
involvement in proceedings concerning patent rights could have a material
adverse effect on LJL BioSystems' business, financial condition and results of
operations.

     The patent positions of life science product companies, including LJL
BioSystems, are uncertain and involve complex legal and factual questions. In
addition, the coverage claimed in a patent application can be significantly
reduced before the patent is issued. Consequently, there can be no assurance
that LJL BioSystems' patent applications or those of its licensors will result
in patents being issued or that any issued patents will provide protection
against competitive technologies or will be held valid if challenged or
circumvented. Others may independently develop products similar to LJL
BioSystems' products, or design around or otherwise circumvent patents issued to
it. In the event that any relevant claims of third-party patents are upheld as
valid and enforceable, LJL BioSystems could be prevented from practicing the
subject matter claimed in such patents, or would be required to obtain licenses
from the patent owners of each of such patents or to redesign its products or
processes to avoid infringement. There can be no assurance that such licenses
would be available or, if available, would be on terms acceptable to LJL
BioSystems or that it would be successful in any attempt to redesign its
products or processes to avoid infringement. If LJL BioSystems does not obtain
the necessary licenses, it could be subject to litigation and encounter delays
in product introductions while it attempts to design around such patents.
Alternatively, the development, manufacture or sale of such products could be
prevented. Litigation would result in significant costs to LJL BioSystems as
well as diversion of management time. Adverse determinations in any such
proceedings could have a material adverse effect on LJL BioSystems' business,
financial condition and results of operations.

     LJL BioSystems also relies on trade secret and copyright law, as well as
employee and third-party nondisclosure agreements to protect its intellectual
property rights in its products and technology. There can be no assurance that
these agreements and measures will provide meaningful protection of LJL
BioSystems' trade secrets, copyrights, know-how, or other proprietary
information in the event of any unauthorized use, misappropriation or
disclosure. In addition, others may independently develop substantially
equivalent proprietary technologies. Litigation to protect LJL BioSystems' trade
secrets or copyrights would result in significant costs to it as well as
diversion of management time. Adverse determinations in any such proceedings or
unauthorized disclosure of LJL BioSystems' trade secrets could have a material
adverse effect on its business, financial condition and results of operations.
In addition, the laws of certain foreign countries do not protect LJL
BioSystems' intellectual property rights to the same extent as U.S. laws. There
can be no assurance that LJL BioSystems will be able to protect its intellectual
property in these markets.

SOME OF LJL BIOSYSTEMS' PRODUCTS ARE SUBJECT TO GOVERNMENT REGULATION, AND THE
FAILURE BY LJL BIOSYSTEMS OR ITS ORIGINAL EQUIPMENT MANUFACTURING CUSTOMERS TO
COMPLY WITH GOVERNMENT REGULATIONS COULD LIMIT ITS SALES OF THESE PRODUCTS.

     While LJL BioSystems believes that none of its products will be regulated
as medical devices or otherwise subject to FDA regulation, LJL BioSystems'
clinical diagnostics products, including the Luminometer, Q2000, Horizon and a
microplate heater, are subject to FDA regulation as medical devices, as well as
similar foreign regulation. The process of obtaining and maintaining required
regulatory clearances and approvals and otherwise remaining in regulatory
compliance in the U.S. and certain other countries is lengthy, expensive and
uncertain. Although LJL BioSystems has phased out production of the Luminometer,
Q2000 and the microplate heater, it will continue to manufacture the Horizon on
an original equipment manufacturing basis during 2000 but does not expect to
manufacture the Horizon after

                                       35
<PAGE>   44

2000. The Horizon is used in research and clinical laboratories to perform in
vitro diagnostic tests, which are exempt from investigational device exemption
requirements, including the need to obtain the FDA's prior approval, provided
that, among other things:

     - the testing is noninvasive;

     - the product is not used as a diagnostic procedure without confirmation by
       another medically established test or procedure; and

     - distribution controls are established to assure that in vitro diagnostic
       products distributed for research are used only for those purposes.

     To LJL BioSystems' knowledge, its original equipment manufacturing
customers have met these conditions. However, the FDA may not agree that LJL
BioSystems' original equipment manufacturing customers' distribution of LJL
BioSystems' clinical diagnostic products meets and has met the requirements for
investigational device exemption. Failure by LJL BioSystems, its original
equipment manufacturing customers or the recipients of its clinical diagnostic
products to comply with the investigational device exemption requirements could
result in enforcement action by the FDA, which could adversely affect LJL
BioSystems or its original equipment manufacturing customers' ability to gain
marketing clearance or approval of these products or could result in the recall
of previously distributed products.

     Applicable law requires that LJL BioSystems comply with the FDA's
regulations for the manufacture of the Horizon. The FDA monitors compliance with
its regulations by subjecting medical product manufacturers to periodic FDA
inspections of their manufacturing facilities. The FDA has recently revised its
regulations, and the new regulations impose design controls and make other
significant changes in the requirements applicable to manufacturers. LJL
BioSystems is also subject to other regulatory requirements, and may need to
submit reports to the FDA, including adverse event reporting. Failure to comply
with current FDA regulations or other applicable legal requirements can lead to,
among other things:

     - warning letters;

     - seizure of violative products;

     - suspension of manufacturing, government injunctions; and

     - potential civil or criminal liability on LJL BioSystems' part and the
       part of the responsible officers and employees.

     In addition, the government may halt or restrict continued sale of such
instruments. In conjunction with the export of its clinical diagnostics
instruments, LJL BioSystems maintains International Organization for
Standardization 9001 certification and applies the CE mark to certain products
that are exported, which subjects LJL BioSystems' operations to periodic
surveillance audits. LJL BioSystems believes it is currently in compliance with
all applicable regulations and standards, however, there can be no assurance
that its operations will be found to comply with these regulations or standards
or other applicable legal requirements in the future or that LJL BioSystems will
not be required to incur substantial costs to maintain its compliance with
existing or future manufacturing regulations, standards or other requirements.
Any such noncompliance or increased cost of compliance could have a material
adverse effect on LJL BioSystems' business, results of operations and financial
condition.

     LJL BioSystems is also subject to numerous federal, state and local laws
relating to safe working conditions, manufacturing practices, environmental
protection and storage, use and disposal of hazardous or potentially hazardous
substances. Any material failure to comply with such laws could require LJL
BioSystems to incur significant costs and would have a material, adverse effect
upon its ability to do business. Changes in existing requirements or adoption of
new requirements or policies relating to government regulations could materially
and adversely affect LJL BioSystems' ability to comply with such requirements.

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<PAGE>   45

LJL BIOSYSTEMS USES HAZARDOUS MATERIALS AND IMPROPER HANDLING OF THESE MATERIALS
BY ITS EMPLOYEES OR AGENTS COULD EXPOSE LJL BIOSYSTEMS TO SIGNIFICANT FINANCIAL
PENALTIES.

     LJL BioSystems' research and development and manufacturing operations
involve the use of hazardous materials, biological samples and chemicals. LJL
BioSystems manufactures certain reagents and assay kits, some of which contain
hazardous materials, including carcinogens. LJL BioSystems is subject to
federal, state and local laws and regulations governing the storage, use and
disposal of such materials and certain waste products. The risk of accidental
contamination or injury from the use of these materials cannot be completely
eliminated. In the event of an accident, LJL BioSystems could be held liable for
damages that result and any such liability could exceed its resources, which
would have a material adverse effect on LJL BioSystems. LJL BioSystems may incur
substantial costs to comply with environmental and safety regulations.

IF ETHICAL AND OTHER CONCERNS SURROUNDING THE USE OF GENETIC INFORMATION BECOME
WIDESPREAD, LJL BIOSYSTEMS MAY HAVE LESS DEMAND FOR ITS PRODUCTS.

     Genetic testing has raised ethical issues regarding confidentiality and the
appropriate uses of the resulting information. For these reasons, governmental
authorities may call for limits on or regulation of the use of genetic testing
or prohibit testing for genetic predisposition to certain conditions,
particularly for those that have no known cure. Any of these scenarios could
reduce the potential markets for LJL BioSystems' products, which could seriously
harm its business, financial condition and results of operation.

LJL BIOSYSTEMS' FUTURE OPERATING RESULTS ARE LIKELY TO FLUCTUATE.

     Past financial results including but not limited to revenue growth and
product gross margins are not indicative of LJL BioSystems' future operating
performance. LJL BioSystems' future operating results are likely to fluctuate
substantially from year to year and quarter to quarter. The degree of
fluctuation will depend on a number of factors, including:

     - the timing and level of sales;

     - the mix of products sold through direct sales channels and third party
       distributors; and

     - any change in the product mix among LJL BioSystems' existing and planned
       product lines.

     Fluctuations of these factors could have a material adverse effect on LJL
BioSystems' business, financial condition and results of operations. Because LJL
BioSystems expects a significant portion of its business to be derived from
orders placed by a limited number of large customers, variations in the timing
of such orders could cause significant fluctuations in LJL BioSystems' operating
results. Other factors that may result in fluctuations in operating results
include:

     - industry acceptance of high throughput and ultra-high throughput products
       as a drug discovery tool;

     - market acceptance of LJL BioSystems' products;

     - the timing of new product announcements and the introduction of new
       products and new technologies by LJL BioSystems or its competitors;

     - delays in research and development of new products;

     - increased research and development expenses;

     - increased marketing and sales expenses associated with the implementation
       of LJL BioSystems' direct marketing efforts;

     - increased spending to develop and market LJL BioSystems' SNP genotyping
       product lines;

     - availability and cost of component parts from LJL BioSystems' suppliers;

     - competitive pricing pressures; and

     - developments with respect to regulatory matters.
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<PAGE>   46

     In connection with future introductions of new products, LJL BioSystems may
be required to record charges for inventory obsolescence in connection with
unsold inventory, if any, of older generations of products.

     LJL BioSystems' expenditures for research and development, selling, support
and marketing and general and administrative functions are based in part on
future revenue projections. LJL BioSystems may be unable to adjust spending in a
timely manner in response to any unanticipated declines in revenue, which may
have a material adverse effect on its business, financial condition and results
of operations. LJL BioSystems may be required to reduce prices in response to
competitive pressures or other factors or increase spending to pursue new market
opportunities. Any decline in the average selling price of a product which is
not offset by a reduction in product costs or by sales of other products with
higher gross margins would decrease LJL BioSystems' overall gross profit and
adversely affect its business, financial condition and results of operations. In
addition, LJL BioSystems' operating results may vary from the expectations of
public market analysts and investors, and, as a result, the price of its common
stock could be materially and adversely affected.

                                       38
<PAGE>   47

                                 THE COMPANIES

MOLECULAR DEVICES

     Molecular Devices is a leading developer of high-performance, bioanalytical
measurement systems that accelerate and improve drug discovery and other life
sciences research. Molecular Devices' systems enable pharmaceutical and
biotechnology companies to leverage advances in genomics and combinatorial
chemistry by facilitating the high throughput and cost effective identification
and evaluation of drug candidates. Molecular Devices' instrument systems are
based on its advanced core technologies which integrate its expertise in
engineering, molecular and cell biology and chemistry. Molecular Devices'
systems are fundamental tools for drug discovery and life sciences research, and
its MAXline series of microplate readers and its FLIPR Cell Analysis systems are
market share leaders in their respective markets. Molecular Devices' revenues
were $62.0 million in 1999 and have increased at a compound annual rate of 25%
since 1995.

     Advances in genomics and combinatorial chemistry have resulted in an
increasing number of new disease targets and drug candidates that can be
screened or evaluated in the drug discovery process. Researchers face severe
bottlenecks in the downstream phases of the drug discovery process, including
assay development, drug candidate screening and lead optimization, which require
more advanced and efficient evaluation technologies. Molecular Devices' products
target these phases of the drug discovery process and are designed to eliminate
these bottlenecks. Industry sources estimate that in 2000, pharmaceutical
companies will spend approximately $2.7 billion on third party drug discovery
instrumentation, reagents and services. Molecular Devices currently offers three
product families to serve this market.

     - Molecular Devices' MAXline products include advanced microplate readers
       that are used to acquire and process large quantities of biochemical and
       biological data and are primarily used in assay development. Molecular
       Devices' MAXline strategy has been to continue to introduce new products
       that include first-of-a-kind features, as well as to offer varying
       feature sets and price points to address different market segments.
       Molecular Devices has historically focused on the premium end of the
       microplate reader market by offering products with advanced capabilities.
       MAXline products represented 57% of Molecular Devices' revenues in 1999.

     - Molecular Devices' Cell Analysis systems, which include FLIPR and CLIPR,
       are used to study the response of live cells to drug candidates and
       primarily address high throughput screening and lead optimization.
       Because Molecular Devices' products permit the analysis of live cells,
       they allow researchers to obtain more biologically relevant information
       than can be obtained through the use of traditional biochemical assays.
       FLIPR is the market leader in cellular high throughput screening, and in
       1999 Molecular Devices introduced the CLIPR system, which provides live
       cell analysis at an ultra high throughput rate. Molecular Devices' Cell
       Analysis systems represented 38% of its revenues in 1999.

     - Molecular Devices' Threshold system, which is comprised of a detection
       instrument and proprietary reagents, is used to quantify contaminants in
       the manufacturing and quality control of bioengineered products.
       Threshold system products represented 5% of Molecular Devices' revenues
       in 1999.

     Molecular Devices typically invests 10% to 12% of its revenues in research
and development, which has resulted in a track record of technological
innovation. Over 70% of Molecular Devices' revenues in 1999 were derived from
products that it introduced in the last three years. Molecular Devices has sold
over 14,000 instruments since the introduction of its first microplate reader in
1987. In addition, over 70 customers have purchased Molecular Devices' FLIPR
systems since introduction in 1996, including the 20 largest pharmaceutical
companies, several of which own five or more FLIPR systems. Molecular Devices
expects that increased sales of recently introduced products, including GEMINI
XS, FLIPR(384) and CLIPR, and revenues from new instrument introductions will
continue to drive Molecular Devices' growth. Molecular Devices also believes
that the introduction of reagent kits optimized for its products represents a
significant growth opportunity.
                                       39
<PAGE>   48

     Molecular Devices' objective is to be the world's leading provider of
innovative bioanalytical systems and related consumable products for life
sciences research. Molecular Devices is focusing on the drug discovery market
and, specifically, on providing complete solutions that accelerate and improve
the critical downstream drug discovery processes of assay development, drug
candidate screening and lead optimization. Key elements of Molecular Devices'
strategy include:

     - maintaining and advancing its technological leadership;

     - leveraging its market leadership position;

     - increasing recurring revenue from its consumable products;

     - expanding worldwide distribution and support of its products; and

     - acquiring complementary businesses and technologies.

     Molecular Devices was incorporated in the State of Delaware. Molecular
Devices' executive offices are located at 1311 Orleans Drive, Sunnyvale,
California 94089. Molecular Devices' telephone number is (408) 747-1700 and its
internet address is www.moleculardevices.com. The information on Molecular
Devices' website is not part of this prospectus.

MERCURY ACQUISITION SUB, INC.

     Mercury Acquisition Sub, Inc. is a wholly owned subsidiary of Molecular
Devices incorporated on December 28, 1999, in the State of Delaware. Mercury
Acquisition does not engage in any operations and exists solely to facilitate
the merger.

LJL BIOSYSTEMS

     LJL BioSystems designs, produces and sells infrastructure tools that
accelerate and enhance the process of discovering new drugs in the genomics and
post-genomics era. LJL BioSystems' products, including instruments and
consumables, are designed to provide flexible, cost-efficient, high throughput
solutions that can be used across all stages of the drug discovery process. LJL
BioSystems' customers include pharmaceutical, biotechnology and genomics
companies as well as research institutions. Since 1998, 21 of the top 25
pharmaceutical companies have purchased LJL BioSystems' products and more than
60% of these customers are repeat customers. In addition LJL BioSystems entered
into strategic collaborations with AstraZeneca in October 1999 and SmithKline
Beecham in September 1998 that provide each of them with early access to certain
of LJL BioSystems' new technologies. LJL BioSystems' customers primarily use its
products for high throughput drug discovery, including screening and genotyping.

     Screening, or testing, of compounds against a target is an essential stage
in the drug discovery process. Advances in genomics, synthetic chemistry and
other technologies have dramatically increased the number of both targets and
compounds. Screening significantly larger numbers of compounds against an
increasing number of targets requires new high throughput infrastructure tools
that can operate with a high degree of automation and analytical flexibility.

     In addition, LJL BioSystems believes there is a growing demand for high
throughput genotyping, including the analysis of certain variations in DNA,
called single nucleotide polymorphisms or SNPs. SNPs are believed to be
associated with differences between individuals, including disease
predispositions and dissimilarity in patient responses to drugs. LJL BioSystems
believes that SNP analysis will play an essential role in the development of
drugs, diagnostics and other life science applications. In order to discover and
utilize SNPs, it is expected that extremely large numbers of SNPs must be
analyzed and correlated with health and other physical and mental features. SNP
analysis requires highly accurate, cost-efficient, high throughput genotyping
technology.

                                       40
<PAGE>   49

     LJL BioSystems' current products, which are based on its proprietary
technologies, are summarized below:

<TABLE>
<CAPTION>
                  PRODUCT         COMMERCIAL LAUNCH                DESCRIPTION
                  -------         -----------------                -----------
<S>          <C>                  <C>                  <C>
INSTRUMENTS  Analyst HT            May 1998            High throughput analyzer
             Acquest               September 1998      Ultra-high throughput analyzer
             Analyst AD            April 1999          Assay development analyzer

CONSUMABLE   TKX                   June 1998           Enzyme assay kit
  REAGENTS   TKXtra                April 1999          Enzyme assay kit
             DPX                   September 1999      Receptor assay kit
             ProteasePX            September 1999      Enzyme assay kit
             cAMP                  September 1999      Cell signaling molecule assay
             Sunnyvale Red         September 1999      Reagent for detecting large
                                                         molecule interactions

CONSUMABLE   96-well HE Plate      December 1999       Microplates for miniaturized
MICROPLATES                                              96-well format assays
             384-well HE Plate     December 1999       Microplates for miniaturized
                                                         384-well format assays
</TABLE>

     LJL BioSystems' current products are based on its proprietary technologies
that integrate its expertise in a number of areas including advanced optics,
electronics, automation and robotics, microfluidics, fluorescence detector
technologies, software and information systems, biophysics, biology and
chemistry.

     One of LJL BioSystems' core technologies is called High Efficiency
Fluorescence Polarization, or HEFP. HEFP detects molecular binding events by
measuring changes in the speed of molecular rotation. HEFP enables high
throughput, cost-efficient, flexible tests, or assays, that can be easily
miniaturized and automated.

     In August 1999, LJL BioSystems created its Genomics Sciences Group to
commercialize its HEFP technology in the area of genotyping. LJL BioSystems
recently began selling and shipping its analyzer platform for high throughput
SNP genotyping to customers at several leading genomics companies and research
institutions.

     In addition to LJL BioSystems' current product offerings, it is developing
new technologies and services designed to address the evolving high throughput
demands of life science research. Some of LJL BioSystems' new technologies under
development include:

     - In September 1999, LJL BioSystems demonstrated a prototype and announced
       the introduction of its next generation instrument platform,
       ScreenStation. ScreenStation is being developed to enable integrated
       assay automation, miniaturization and multiple detection modes at a high
       throughput rate. LJL BioSystems' believes ScreenStation technology
       represents a significant advance in high throughput screening as it
       enables pharmaceutical companies to easily implement homogeneous assays
       that are fast, miniaturized, and non-radioactive. LJL BioSystems plans to
       start shipments in 2000.

     - FLARe, or Fluorescence Lifetime Assay Repertoire, is LJL BioSystems'
       proprietary instrumentation and reagent platform that significantly
       reduces the effect of background noise in certain fluorescence-based
       assays. In September 1998, LJL BioSystems entered into a collaboration
       agreement with SmithKline Beecham, which provides them early access to
       LJL BioSystems' FLARe technology. In February 2000, LJL BioSystems
       announced the successful completion of an important milestone in its
       collaboration with SmithKline Beecham with the acceptance and delivery of
       the first system utilizing LJL BioSystems' FLARe technology.

     LJL BioSystems was incorporated in the State of Delaware. LJL BioSystems'
principal executive offices are located at 405 Tasman Drive, Sunnyvale, CA 94089
and its telephone number is (408) 541-8787. LJL BioSystems' corporate web site
is www.ljlbio.com. LJL BioSystems' website is not a part of this prospectus.

                                       41
<PAGE>   50

             THE SPECIAL MEETING OF MOLECULAR DEVICES STOCKHOLDERS

DATE, TIME AND PLACE


     The special meeting of Molecular Devices stockholders will be held on
Wednesday, August 30, 2000, at the principal executive offices of Molecular
Devices located at 1311 Orleans Drive, Sunnyvale, California commencing at 10:30
a.m. local time. We are sending this joint proxy statement/prospectus to you in
connection with the solicitation of proxies by the Molecular Devices board of
directors for use at the Molecular Devices special meeting and any adjournments
or postponements of the special meeting.


PURPOSES OF THE SPECIAL MEETING

     The purposes of the special meeting are:

     - to consider and vote on the proposal to approve the issuance of shares of
       Molecular Devices common stock in the merger; and

     - to transact such other business as may properly come before the special
       meeting or any adjournments or postponements of the special meeting.

RECOMMENDATION OF MOLECULAR DEVICES' BOARD OF DIRECTORS

     THE MOLECULAR DEVICES BOARD OF DIRECTORS HAS CONCLUDED THAT THE PROPOSAL TO
APPROVE THE ISSUANCE OF SHARES OF MOLECULAR DEVICES COMMON STOCK IN THE MERGER
IS ADVISABLE AND IN THE BEST INTERESTS OF MOLECULAR DEVICES AND ITS STOCKHOLDERS
AND HAS UNANIMOUSLY APPROVED AND ADOPTED THE PROPOSAL. ACCORDINGLY, THE
MOLECULAR DEVICES BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT ALL MOLECULAR
DEVICES STOCKHOLDERS VOTE "FOR" THE ISSUANCE OF SHARES OF MOLECULAR DEVICES
COMMON STOCK IN THE MERGER.

RECORD DATE AND VOTING POWER


     Only holders of record of Molecular Devices common stock at the close of
business on the record date, July 14, 2000, are entitled to notice of, and to
vote at, the special meeting. There were approximately 92 holders of record of
Molecular Devices common stock at the close of business on the record date, with
11,508,585 shares of Molecular Devices common stock issued and outstanding. Each
share of Molecular Devices common stock entitles the holder thereof to one vote
on each matter submitted for stockholder approval. See "Security Ownership by
Certain Beneficial Owners -- Beneficial Ownership of Molecular Devices Shares"
for information regarding persons known to the management of Molecular Devices
to be the beneficial owners of more than 5% of the outstanding shares of
Molecular Devices common stock.


VOTING AND REVOCATION OF PROXIES

     All properly executed proxies that are not revoked will be voted at the
special meeting and at any adjournments or postponements of the special meeting
in accordance with the instructions contained in the proxy. If a holder of
Molecular Devices common stock executes and returns a proxy and does not specify
otherwise, the shares represented by that proxy will be voted "for" the issuance
of shares of Molecular Devices common stock in the merger in accordance with the
recommendation of the Molecular Devices board of directors.

     A Molecular Devices stockholder who has executed and returned a proxy may
revoke it at any time before it is voted at the special meeting by executing and
returning a proxy bearing a later date, filing written notice of revocation with
the Secretary of Molecular Devices stating that the proxy is revoked or
attending the special meeting and voting in person.

                                       42
<PAGE>   51

REQUIRED VOTE

     The presence, in person or by proxy, at the special meeting of the holders
of a majority of the shares of Molecular Devices common stock outstanding and
entitled to vote at the special meeting is necessary to constitute a quorum at
the meeting. The affirmative vote of the holders of a majority of the votes cast
is required for approval of the issuance of the Molecular Devices shares in the
merger. Abstentions and broker non-votes are counted towards a quorum but are
not counted for any purpose in determining whether the proposal is approved.


     At the record date for the special meeting, the directors and executive
officers of Molecular Devices owned approximately 8.7% of the outstanding shares
of Molecular Devices common stock entitled to vote at the meeting. Moshe H.
Alafi, David L. Anderson, A. Blaine Bowman, Paul Goddard, Ph.D, Andre F. Marion,
Harden M. McConnell, Ph.D, and J. Allan Waitz, Ph.D, directors of Molecular
Devices, and Joseph D. Keegan, Ph.D (also a director), Timothy A. Harkness,
Gillian M.K. Humphries, Ph.D, Tony M. Lima, Robert J. Murray, Andrew T. Zander
and John S. Senaldi, executive officers of Molecular Devices, Alafi Capital
Company, Harden M. McConnell and Sophia G. McConnell Trust under Agreement Dated
March 29, 1992, the Anderson Living Trust UAD 1/22/98, Anvest, L.P. and Dionex
Corporation have each entered into a voting agreement with LJL BioSystems dated
June 7, 2000. They have agreed in the voting agreements to vote all shares of
Molecular Devices common stock owned by them as of the record date in favor of
the issuance of shares of Molecular Devices common stock in the merger and in
favor of the election of Lev J. Leytes to the board of directors of Molecular
Devices. They granted LJL BioSystems an irrevocable proxy to vote their shares
of Molecular Devices common stock in favor of the issuance of shares of
Molecular Devices common stock in the merger and in favor of the election of Lev
J. Leytes to the board of directors of Molecular Devices. Approximately
1,380,220 shares of Molecular Devices common stock, which represents
approximately 12% of the outstanding shares of Molecular Devices common stock as
of the record date, are subject to the voting agreements. See "Voting
Agreements -- Voting Agreements Relating to Molecular Devices Shares."


SOLICITATION OF PROXIES


     In addition to solicitation by mail, the directors, officers, employees and
agents of Molecular Devices may solicit proxies from Molecular Devices
stockholders by personal interview, telephone, telegram or otherwise. Molecular
Devices will bear the costs of the solicitation of proxies from its
stockholders, except that Molecular Devices and LJL BioSystems will each pay
one-half of the cost of printing this joint proxy statement/prospectus.
Arrangements will also be made with brokerage firms and other custodians,
nominees and fiduciaries who are record holders of Molecular Devices common
stock for the forwarding of solicitation materials to the beneficial owners of
Molecular Devices common stock. Molecular Devices will reimburse these brokers,
custodians, nominees and fiduciaries for the reasonable out-of-pocket expenses
they incur in connection with the forwarding of solicitation materials.


OTHER MATTERS

     At the date of this joint proxy statement/prospectus, the Molecular Devices
board of directors does not know of any business to be presented at the special
meeting other than as set forth in the notice accompanying this joint proxy
statement/prospectus. If any other matters should properly come before the
special meeting, it is intended that the shares represented by proxies will be
voted with respect to such matters in accordance with the judgment of the
persons voting such proxies.

                                       43
<PAGE>   52

               THE SPECIAL MEETING OF LJL BIOSYSTEMS STOCKHOLDERS

DATE, TIME AND PLACE


     The special meeting of LJL BioSystems stockholders will be held on
Wednesday, August 30, 2000, at the principal executive offices at LJL BioSystems
located at 405 Tasman Drive, Sunnyvale, California 94089 commencing at 9:00 a.m.
local time. We are sending this joint proxy statement/ prospectus to you in
connection with the solicitation of proxies by the LJL BioSystems board of
directors for use at the LJL BioSystems special meeting and any adjournments or
postponements of the special meeting.



PURPOSES OF THE SPECIAL MEETING


     The purposes of the special meeting are:

     - to consider and vote upon a proposal to adopt the merger agreement; and

     - to transact such other business as may properly come before the special
       meeting or any adjournments or postponements of the special meeting.

RECOMMENDATION OF LJL BIOSYSTEMS' BOARD OF DIRECTORS

     THE LJL BIOSYSTEMS BOARD OF DIRECTORS HAS CONCLUDED THAT THE PROPOSAL TO
ADOPT THE MERGER AGREEMENT IS ADVISABLE AND IN THE BEST INTERESTS OF LJL
BIOSYSTEMS AND ITS STOCKHOLDERS AND HAS UNANIMOUSLY APPROVED AND ADOPTED THE
MERGER AND THE MERGER AGREEMENT. ACCORDINGLY, THE LJL BIOSYSTEMS BOARD OF
DIRECTORS HAS DECLARED ADVISABLE, AND UNANIMOUSLY RECOMMENDS, THAT ALL LJL
BIOSYSTEMS STOCKHOLDERS VOTE "FOR" THE ADOPTION OF THE MERGER AGREEMENT.

RECORD DATE AND VOTING POWER


     Only holders of record of LJL BioSystems common stock at the close of
business on the record date, July 14, 2000, are entitled to notice of, and to
vote at, the special meeting. There were approximately 109 holders of record of
LJL BioSystems common stock at the close of business on the record date, with
14,857,528 shares of LJL BioSystems common stock issued and outstanding. Each
share of LJL BioSystems common stock entitles the holder thereof to one vote on
each matter submitted for stockholder approval. See "Security Ownership by
Certain Beneficial Owners -- Beneficial Ownership of LJL BioSystems Shares" for
information regarding persons known to the management of LJL BioSystems to be
the beneficial owners of more than 5% of the outstanding shares of LJL
BioSystems common stock.


VOTING AND REVOCATION OF PROXIES

     All properly executed proxies that are not revoked will be voted at the
special meeting and at any adjournments or postponements of the special meeting
in accordance with the instructions contained in the proxy. If a holder of LJL
BioSystems common stock properly executes and returns a proxy and does not
specify otherwise, the shares represented by that proxy will be voted "for"
adoption of the merger agreement in accordance with the recommendation of the
LJL BioSystems board of directors.

     A LJL BioSystems stockholder who has executed and returned a proxy may
revoke it at any time before it is voted at the special meeting by executing and
returning a proxy bearing a later date, filing written notice of revocation with
the Secretary of LJL BioSystems stating that the proxy is revoked or attending
the special meeting and voting in person.

REQUIRED VOTE

     The presence, in person or by proxy, at the special meeting of the holders
of a majority of the shares of LJL BioSystems common stock outstanding and
entitled to vote at the special meeting is necessary to constitute a quorum at
the meeting. The affirmative vote of the holders of a majority of the shares of
LJL

                                       44
<PAGE>   53

BioSystems common stock outstanding as of the record date is required to approve
the principal terms of the merger. In determining whether the principal terms of
the merger have received the requisite number of affirmative votes, abstentions
and broker non-votes will have the same effect as a vote against the principal
terms of the merger.


     At the record date for the special meeting, the directors and executive
officers of LJL BioSystems owned approximately 3,771,387 shares of LJL
BioSystems common stock, which represents 25.4% of the outstanding shares of LJL
BioSystems common stock entitled to vote at the meeting. Michael F. Bigham,
George W. Dunbar, Jr., John G. Freund, M.D. and Daniel S. Janney, directors of
LJL BioSystems, and, Lev J. Leytes, Larry Tannenbaum, Richard M. Eglen, Ph.D,
James S. Richey, Anthony H. Bautista, Robert T. Beggs, Douglas N. Modlin, Ph.D
and Galina Leytes, executive officers of LJL BioSystems, and Yalta Investments,
L.P., the Leytes Revocable Trust UADTD 8/13/99, Mary E. Leytes Irrevocable Trust
UADTD 6/21/96, Doug Modlin, Custodian for Anna Lark Modlin U/CA/UTMA, Doug
Modlin, Custodian for Sara Elayne Modlin U/CA/UTMA, the Freund-Sexton 1997
Irrevocable Childrens Trust UADTD 1/20/97 and Dina L. Leytes Irrevocable Trust
UADTD 6/21/96 and the Freund/Sexton Living Trust dated 2/8/91 have each entered
into a voting agreement with Molecular Devices dated June 7, 2000. They have
agreed in the voting agreements to vote all shares of LJL BioSystems common
stock owned by them of record as of the record date in favor of the adoption of
the merger agreement. In addition, they have granted Molecular Devices an
irrevocable proxy to vote their shares of LJL BioSystems common stock in favor
of the adoption of the merger agreement. Approximately 3,771,387 shares of LJL
BioSystems common stock, which represents approximately 25.4% of the outstanding
shares of LJL BioSystems common stock as of the record date, are subject to the
voting agreements. See "Voting Agreements -- Voting Agreements Relating to LJL
BioSystems Shares."


SOLICITATION OF PROXIES

     In addition to solicitation by mail, the directors, officers, employees and
agents of LJL BioSystems may solicit proxies from LJL BioSystems' stockholders
by personal interview, telephone, telegram or otherwise. LJL BioSystems will
bear the costs of the solicitation of proxies from its stockholders, except that
Molecular Devices and LJL BioSystems will each pay one-half of the cost of
printing this joint proxy statement/prospectus. Arrangements will also be made
with brokerage firms and other custodians, nominees and fiduciaries who are
record holders of LJL BioSystems common stock for the forwarding of solicitation
materials to the beneficial owners of LJL BioSystems common stock. LJL
BioSystems will reimburse these brokers, custodians, nominees and fiduciaries
for the reasonable out-of-pocket expenses they incur in connection with the
forwarding of solicitation materials.

OTHER MATTERS

     At the date of this joint proxy statement/prospectus, the LJL BioSystems
board of directors does not know of any business to be presented at the special
meeting other than as set forth in the notice accompanying this joint proxy
statement/prospectus. If any other matters should properly come before the
special meeting, it is intended that the shares represented by proxies will be
voted with respect to such matters in accordance with the judgment of the
persons voting such proxies.

                                       45
<PAGE>   54

                                   THE MERGER

GENERAL

     This section of the document describes aspects of the proposed merger that
we consider to be important. The discussion of the merger in this joint proxy
statement/prospectus and the description of the principal terms of the merger
agreement are only summaries of the material features of the proposed merger.
You can obtain a more complete understanding of the merger by reading the merger
agreement, a copy of which is attached to this joint proxy statement/prospectus
as Annex A. You are encouraged to read the merger agreement and the other
annexes to this joint proxy statement/prospectus in their entirety.

GENERAL DESCRIPTION OF THE MERGER

     At the effective time, Merger Sub will be merged with and into LJL
BioSystems. LJL BioSystems will be the surviving corporation and will continue
as a wholly owned subsidiary of Molecular Devices. In the merger, each share of
LJL BioSystems common stock outstanding at the effective time will automatically
be converted into 0.30 of a share of Molecular Devices common stock.


     Based on the number of shares of Molecular Devices common stock and LJL
BioSystems common stock outstanding as of the record date, 4,457,258 shares of
Molecular Devices common stock will be issuable pursuant to the merger
agreement, representing approximately 28% of the total Molecular Devices common
stock to be outstanding after such issuance. This assumes that no LJL BioSystems
or Molecular Devices stock options are exercised.


BACKGROUND

     As part of its business strategy for the past few years, Molecular Devices
has identified and pursued opportunities for growth through the acquisition of,
or combination with, complementary businesses. LJL BioSystems has articulated
and pursued a similar strategy.

     Molecular Devices and LJL BioSystems have been familiar with each other's
businesses for many years. During this time, senior executives of the two
companies have frequently encountered one another in a variety of business and
industry settings. The two companies entered into formal discussions regarding a
potential merger and began financial and technical due diligence with respect to
the other company's business in late 1999; however, these talks were terminated
on January 8, 2000, due to the inability of the parties to reach agreement on
several key deal terms. All confidential information received by Molecular
Devices and LJL BioSystems regarding the other's business was returned to the
disclosing parties or destroyed by the end of February 2000. Between January 8,
2000 and May 30, 2000, no discussions occurred between Molecular Devices and LJL
BioSystems regarding any potential combination of the companies.


     On May 31, 2000, Joseph Keegan, Ph.D, Molecular Devices' President and
Chief Executive Officer, made a telephone call to Lev J. Leytes, LJL BioSystems'
President and Chief Executive Officer to initiate a dialogue with respect to a
possible business combination between the companies, and Dr. Keegan and Mr.
Leytes agreed to meet face-to-face on June 2, 2000. At the meeting on the
morning of June 2, 2000, Dr. Keegan and Mr. Leytes discussed a possible business
combination between the companies. Dr. Keegan and Mr. Leytes then agreed to meet
later that afternoon, together with the Chief Financial Officers of their
respective companies, to continue the discussion. At the meeting on the
afternoon of June 2, 2000, Dr. Keegan, Mr. Leytes, Timothy Harkness, the Chief
Financial Officer of Molecular Devices and Larry Tannenbaum, the Chief Financial
Officer of LJL BioSystems, engaged in discussions concerning valuation issues
and agreed to continue discussions regarding a merger of the two companies. In
addition, the chief financial officers of both companies discussed the process
for renewed due diligence investigations.


     On May 18, 1999, LJL BioSystems engaged Gleacher & Co. LLC to provide
strategic and financial advice in connection with the potential sale of LJL
BioSystems. From late January 2000 through May 31, 2000, Gleacher & Co. did not
provide services to LJL BioSystems with respect to the merger. Pursuant to the
terms of this engagement, on June 2, 2000, LJL BioSystems requested Gleacher &
Co. to provide

                                       46
<PAGE>   55

financial advisory services to the LJL BioSystems board of directors in
connection with a potential transaction with Molecular Devices.

     On November 16, 1999, Molecular Devices engaged ING Barings LLC to provide
strategic and financial advice in connection with a potential acquisition or
merger by Molecular Devices. Pursuant to the terms of this engagement, on June
2, 2000, Molecular Devices requested ING Barings to provide financial advisory
services to the Molecular Devices board of directors in connection with a
potential transaction with LJL BioSystems.


     On June 2, 2000, due diligence request lists were exchanged and the Chief
Financial Officers of both companies, along with their respective outside legal
counsel and financial advisors, exchanged various telephone calls with a view
toward preparing for subsequent due diligence meetings. Each party and its
respective legal counsel, independent auditors and financial advisors continued
its due diligence investigation of the other party through June 7, 2000.


     On June 3, 2000, outside legal counsel to Molecular Devices delivered a
first draft of a merger agreement to outside legal counsel to LJL BioSystems.
Between June 3, 2000 and June 7, 2000, representatives of Molecular Devices and
representatives of LJL BioSystems and the respective outside legal counsel and
financial advisors to Molecular Devices and LJL BioSystems held numerous
meetings and telephone conferences during which the merger agreement and various
related agreements were discussed and negotiated.

     On June 4, 2000, the board of directors of LJL BioSystems held a telephonic
meeting to discuss the proposed merger with Molecular Devices. The board of
directors of LJL BioSystems discussed, among other issues, valuation, the
potential synergies of the proposed combination, the provisions contained in the
proposed merger agreement and the status of due diligence efforts.
Representatives of LJL BioSystems' outside legal counsel and financial advisor
also participated in this meeting.

     On June 5, 2000, the Molecular Devices board of directors met via
conference call to discuss the proposed merger with LJL BioSystems. The
Molecular Devices board of directors discussed, among other issues, valuation,
the potential synergies of the proposed combination, the provisions contained in
the proposed merger agreement and the status of due diligence efforts.
Representatives of Molecular Devices' outside legal counsel and financial
advisor participated in this meeting.


     On June 6, 2000, LJL BioSystems' board of directors met with senior
management and LJL BioSystems' legal and financial advisors at a special
telephonic meeting of the board of directors to discuss the status of the
negotiations with Molecular Devices, LJL BioSystems' due diligence review of
Molecular Devices, and the directors' comments on the draft of the merger
agreement. After management provided its view of the proposed merger, Gleacher &
Co. presented its analysis of various information to serve as the basis for
evaluating the proposed exchange ratio and orally informed LJL BioSystems' board
of directors of its opinion (subsequently confirmed in writing) that, based upon
certain assumptions and qualifications, the exchange ratio pursuant to the
merger agreement was fair, from a financial point of view, to the holders of the
outstanding shares of LJL BioSystems common stock. See "-- Opinion of LJL
BioSystems' Financial Advisor" and the full text of the written opinion of
Gleacher & Co. attached as Annex D. Gleacher & Co. also responded to questions
raised by members of LJL BioSystems' board of directors regarding its analysis
and opinion. Following this presentation, LJL BioSystems' board of directors
engaged in a full discussion of the terms of the proposed merger, including the
strategic benefits of the combination, the terms and conditions of the proposed
merger agreement, and the analysis and opinion of Gleacher & Co. LJL BioSystems'
board of directors concluded that the merger agreement was fair to LJL
BioSystems' stockholders and that the proposed merger was in the best interests
of LJL BioSystems and its stockholders. Accordingly, the LJL BioSystems board of
directors approved the merger and the merger agreement and related documents and
authorized management to proceed with the execution of the merger documents.


     On June 6, 2000, the Molecular Devices board of directors also met via
conference call to consider the proposed merger. At this meeting, ING Barings
made a presentation to the board of directors of

                                       47
<PAGE>   56


Molecular Devices regarding the financial aspects of the merger. In addition,
the board of directors, members of Molecular Devices' management and
representatives of Molecular Devices' outside legal counsel and financial
advisor discussed the terms of the merger agreement and related agreements. At
the conclusion of the financial presentation and the discussion of the terms of
the merger agreement and related agreements, ING Barings provided the board of
directors of Molecular Devices with an oral opinion (subsequently confirmed in
writing) that, based upon certain assumptions and qualifications, the proposed
exchange ratio pursuant to the merger agreement was fair to the stockholders of
Molecular Devices from a financial point of view. The board of directors of
Molecular Devices voted unanimously to approve the merger agreement, the related
agreements and the transactions contemplated by the merger agreement and the
related agreements and authorized the officers of Molecular Devices to finalize
and execute the merger agreement and related agreements.


     On June 7, 2000, the last remaining items of due diligence were completed
by both parties. In addition, on June 7, 2000, Mr. Leytes discussed the
resolution of the board of directors of LJL BioSystems to approve and adopt the
merger and merger agreement with the management of LJL BioSystems and the
management endorsed the decision.

     The merger agreement and related agreements were executed and delivered by
the parties late on June 7, 2000.

     Prior to the opening of the market on June 8, 2000, Molecular Devices and
LJL BioSystems issued a joint press release announcing the execution of the
merger agreement.

REASONS FOR THE MERGER

     The following discussion of the parties' reasons for the merger contains a
number of forward-looking statements that reflect the current views of Molecular
Devices and/or LJL BioSystems with respect to future events that may have an
effect on their future financial performance. Forward-looking statements are
subject to risks and uncertainties. Actual results and outcomes may differ
materially from the results and outcomes discussed in the forward-looking
statements. Cautionary statements that identify important factors that could
cause or contribute to differences in results and outcomes include those
discussed in "Summary -- Forward-Looking Information" and "Risk Factors."

MOLECULAR DEVICES' REASONS FOR THE MERGER

     Molecular Devices' primary reasons for seeking to consummate a business
combination with LJL BioSystems are the beliefs of the Molecular Devices board
of directors and management that a business combination would result in a number
of benefits, including:

     - the ability of the combined company to offer complementary product lines,
       which presents the opportunity to increase the breadth of products
       offered;

     - the ability of the two companies to combine their technological resources
       to develop new products with increased functionality and bring them to
       market faster; and

     - the opportunity for the combined company to compete more effectively in
       the increasingly competitive and rapidly changing market.

     The board of directors of Molecular Devices has determined that the merger
is in the best interests of Molecular Devices and its stockholders. In reaching
its determination, the board of directors of Molecular Devices considered a
number of factors, including the factors discussed above and listed below. The
conclusions of the board of directors of Molecular Devices with respect to each
of these factors supported its determination that the merger and the issuance of
shares of Molecular Devices common stock in the merger were fair to, and in the
best interests of, Molecular Devices and its stockholders. The most relevant
information reviewed and factors considered are set forth below:


     - the strategic benefits of the merger to Molecular Devices associated with
       the integration of LJL BioSystems' products into Molecular Devices'
       product lines;

                                       48
<PAGE>   57

     - the combination of the LJL BioSystems' sales organization with Molecular
       Devices' sales and distribution network;

     - LJL BioSystems' significant technical, engineering, management and sales
       expertise, which is in high demand and short supply;

     - the judgment, advice and analyses of Molecular Devices' management with
       respect to the potential strategic, financial and operational benefits of
       the merger, including Molecular Devices' management's favorable
       recommendation of the merger, based in part on the business, technical,
       financial, accounting and legal due diligence investigations performed
       with respect to LJL BioSystems;


     - the results of operations and financial condition of Molecular Devices
       and LJL BioSystems and the anticipated effect of the combination on
       Molecular Devices' fully-diluted earnings per share;


     - the opinion of ING Barings rendered at the June 6, 2000 meeting of the
       board of directors of Molecular Devices that, based upon certain analyses
       performed by ING Barings and discussed with the board of directors at
       that meeting (portions of which analyses are described below under
       "-- Opinion of Molecular Devices' Financial Advisor"), and based upon and
       subject to the various conditions set forth in the opinion of ING
       Barings, the exchange ratio was fair to the stockholders of Molecular
       Devices from a financial point of view as of June 6, 2000;

     - the complementary fit between Molecular Devices' and LJL BioSystems'
       cultures and market segments, which should facilitate integration of the
       two companies;

     - the terms of the merger agreement and related agreements, including price
       and structure, which were considered by both the board of directors and
       management of Molecular Devices to provide a fair and equitable basis for
       the merger; and

     - the ability to effect the merger as a pooling of interests for financial
       accounting purposes.

     The Molecular Devices board of directors also considered a number of
potentially negative factors in its deliberations concerning the merger. The
negative factors considered by the board of directors of Molecular Devices
included:

     - the risk that the merger might not be completed in a timely manner or at
       all;

     - the negative impact of any customer or supplier confusion after
       announcement of the proposed merger;


     - the potential negative effect on the price of Molecular Devices common
       stock if revenue and earnings expectations of the combined company are
       not met;


     - the potential loss of key LJL BioSystems employees critical to the
       ongoing success of the LJL products and to the successful integration of
       the Molecular Devices and LJL BioSystems product lines;

     - the general difficulties of integrating products, technologies and
       companies;

     - the possibility of cultural conflicts between the two companies; and

     - the other risks and uncertainties discussed above under "Risk Factors."


     The foregoing discussion of information and factors considered by the board
of directors of Molecular Devices is not intended to be exhaustive but is
believed to include all material factors considered by the board of directors of
Molecular Devices. In view of the wide variety of factors considered by the
board of directors of Molecular Devices, the Molecular Devices board of
directors did not find it practicable to quantify or otherwise assign relative
weights to the specific factors considered. In addition, the Molecular Devices
board of directors did not reach any specific conclusion on each factor
considered, or any aspect of any particular factor, but conducted an overall
analysis of these factors. Individual members of the board of directors of
Molecular Devices may have given different weights to different factors. After
taking into account all of the factors set forth above, however, the board of
directors of Molecular Devices

                                       49
<PAGE>   58

unanimously agreed that the merger agreement and the merger were fair to, and in
the best interests of, Molecular Devices and its stockholders and that Molecular
Devices should proceed with the merger.

     THERE CAN BE NO ASSURANCE THAT THE BENEFITS OF THE POTENTIAL GROWTH,
SAVINGS, SYNERGIES OR OPPORTUNITIES CONSIDERED BY THE BOARD OF DIRECTORS OF
MOLECULAR DEVICES WILL BE ACHIEVED THROUGH CONSUMMATION OF THE MERGER. SEE "RISK
FACTORS" BEGINNING ON PAGE 16.

LJL BIOSYSTEMS' REASONS FOR THE MERGER


     At the telephonic meeting of the board of directors of LJL BioSystems on
June 6, 2000, the directors present at the meeting voted unanimously to enter
into the merger agreement and to recommend that LJL BioSystems stockholders vote
to adopt the merger agreement.



     In the course of reaching its decision to approve and adopt the merger and
the merger agreement, the board of directors of LJL BioSystems consulted with
LJL BioSystems' senior management, outside legal counsel and financial advisor
reviewed a significant amount of information and considered a number of factors.
The most relevant information reviewed and factors considered are set forth
below:


     - that by combining the sales and distribution forces of Molecular Devices
       and LJL BioSystems, the combined company could accelerate its market
       penetration rates at life science companies and broaden the impact and
       influence of the combined company throughout its customers' enterprises;

     - that by combining complementary operations, the combined company would
       have better opportunities for future growth;


     - the opportunity for the LJL BioSystems stockholders to participate in a
       larger, stronger, more competitive company with a broader array of
       complementary technologies;


     - the strategic fit between Molecular Devices and LJL BioSystems, and the
       belief that the combined company has the potential to enhance stockholder
       value through additional opportunities and operating efficiencies;

     - the strategic and financial alternatives available to LJL BioSystems;

     - information concerning the business, earnings, operations, competitive
       position and prospects of LJL BioSystems and Molecular Devices both
       individually and on a combined basis including, but not limited to, the
       compatibility of the two companies' operations as a result of the
       consolidation of LJL BioSystems' and Molecular Devices' operations;

     - the opinion of LJL BioSystems' financial advisor delivered orally to the
       LJL BioSystems board of directors on June 6, 2000, and confirmed in
       writing on June 7, 2000, that, based upon certain assumptions and
       qualifications, the exchange ratio pursuant to the merger agreement was
       fair to the LJL BioSystems stockholders from a financial point of view,
       and the financial presentation made by LJL BioSystems' financial advisor
       to the board of directors of LJL BioSystems in connection with the
       delivery of its opinion;

     - the possibility, as alternatives to the merger, of seeking to acquire
       another company, seeking to engage in one or more joint ventures, seeking
       to raise additional capital, or seeking to engage in a combination with a
       company other than Molecular Devices;


     - the amount and form of consideration to be received by the LJL BioSystems
       stockholders in the merger and information on the historical trading
       ranges of LJL BioSystems common stock and Molecular Devices common stock;


     - the likely impact of the merger on LJL BioSystems' employees and
       customers;

     - the expected effect of the merger on LJL BioSystems' existing
       relationships with third parties;

                                       50
<PAGE>   59

     - the interests that certain executive officers and directors of LJL
       BioSystems may have with respect to the merger, in addition to their
       interests as stockholders of LJL BioSystems generally, as described in
       "Interests of LJL BioSystems' Officers and Directors in the Merger;" and

     - the qualification of the merger as a tax-free transaction for United
       States federal income tax purposes (except for tax resulting from any
       cash received for fractional shares by the holders of LJL BioSystems
       common stock).


     The LJL BioSystems board of directors also considered a number of
potentially negative factors in its deliberations concerning the merger. The
negative factors considered by the board of directors of LJL BioSystems
included:



     - the risk that the merger might not be completed in a timely manner or at
       all;



     - the negative impact of any customer or supplier confusion after
       announcement of the proposed merger;



     - the potential negative effect on the price of LJL BioSystems common stock
       if revenue and earnings expectations of the combined company are not met;



     - the potential loss of key LJL BioSystems employees critical to the
       ongoing success of the LJL products and to the successful integration of
       the Molecular Devices and LJL BioSystems product lines;



     - the general difficulties of integrating products, technologies and
       companies;



     - the possibility of cultural conflicts between the two companies; and



     - the other risks and uncertainties discussed above under "Risk Factors."



     The foregoing discussion of the information and factors considered by the
board of directors of LJL BioSystems is not intended to be exhaustive. In view
of the wide variety of the material factors considered in connection with the
evaluation of the merger and the complexity of these matters, the board of
directors of LJL BioSystems did not find it practicable to, and did not,
quantify or otherwise attempt to assign any relative weight to the various
factors considered. In addition, the board of directors of LJL BioSystems did
not undertake to make any specific determination as to whether any particular
factor, or any aspect of any particular factor, was favorable or unfavorable to
the ultimate determination of the board of directors of LJL BioSystems, but
rather the board of directors of LJL BioSystems conducted an overall analysis of
the factors described above, including discussions with and questioning of LJL
BioSystems' senior management, and outside legal counsel and financial advisor.
In considering the factors described above, individual members of the board of
directors of LJL BioSystems may have given different weight to different
factors.


     THERE CAN BE NO ASSURANCE THAT THE BENEFITS OF THE POTENTIAL GROWTH,
SAVINGS, SYNERGIES OR OPPORTUNITIES CONSIDERED BY THE BOARD OF DIRECTORS OF LJL
BIOSYSTEMS WILL BE ACHIEVED THOUGH CONSUMMATION OF THE MERGER. SEE "RISK
FACTORS" BEGINNING ON PAGE 16.

OPINION OF MOLECULAR DEVICES' FINANCIAL ADVISOR


     ING Barings LLC was retained by Molecular Devices to act as its financial
advisor in connection with the proposed acquisition by Molecular Devices of LJL
BioSystems and to render a fairness opinion to the Molecular Devices board
regarding the exchange ratio provided in the merger agreement. At the meeting of
the Molecular Devices board held on June 6, 2000, ING Barings delivered an oral
opinion, subsequently confirmed in writing, to the Molecular Devices board
stating that, as of such date, and based upon the assumptions made, matters
considered and limits of review set forth in the ING Barings opinion, the
exchange ratio was fair from a financial point of view to the stockholders of
Molecular Devices. This analysis, as presented to the Molecular Devices board,
is summarized below. All of the members of the Molecular Devices board were
present at the meeting on June 6, 2000 and had an opportunity to ask questions
regarding ING Barings' presentation.

                                       51
<PAGE>   60


     THE FULL TEXT OF THE ING BARINGS OPINION, WHICH SETS FORTH THE ASSUMPTIONS
MADE, MATTERS CONSIDERED AND CERTAIN LIMITATIONS ON THE SCOPE OF REVIEW
UNDERTAKEN BY ING BARINGS, IS ATTACHED AS ANNEX E TO THIS JOINT PROXY
STATEMENT/PROSPECTUS. EACH HOLDER OF MOLECULAR DEVICES COMMON STOCK IS URGED TO
READ THE OPINION IN ITS ENTIRETY. THE ING BARINGS OPINION WAS INTENDED FOR THE
USE AND BENEFIT OF THE MOLECULAR DEVICES BOARD, WAS DIRECTED ONLY TO THE
FAIRNESS OF THE EXCHANGE RATIO FROM A FINANCIAL POINT OF VIEW TO THE
STOCKHOLDERS OF MOLECULAR DEVICES, AND DOES NOT ADDRESS MOLECULAR DEVICES'
UNDERLYING BUSINESS DECISION TO APPROVE THE MERGER OR CONSTITUTE A
RECOMMENDATION TO ANY STOCKHOLDER AS TO HOW SUCH STOCKHOLDER SHOULD VOTE WITH
RESPECT TO THE MERGER OR ANY TRANSACTION RELATED THERETO. THE EXCHANGE RATIO WAS
DETERMINED ON THE BASIS OF NEGOTIATIONS BETWEEN MOLECULAR DEVICES AND LJL
BIOSYSTEMS AND WAS APPROVED BY THE MOLECULAR DEVICES BOARD. THE SUMMARY OF THE
ING BARINGS OPINION SET FORTH IN THIS JOINT PROXY STATEMENT/PROSPECTUS IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF SUCH OPINION.


     In arriving at their opinion, ING Barings, among other things: (i) reviewed
certain publicly available business and financial information relating to
Molecular Devices and LJL BioSystems which ING Barings deemed to be relevant;
(ii) reviewed certain information, including financial forecasts, relating to
the business, earnings, cash flow, assets, liabilities and prospects of
Molecular Devices and LJL BioSystems furnished to ING Barings by Molecular
Devices and LJL BioSystems; (iii) conducted discussions with members of senior
management of Molecular Devices and LJL BioSystems concerning the matters
described in clauses (i) and (ii) above, as well as their respective businesses
and prospects before and after giving effect to the merger; (iv) reviewed the
market prices and valuation multiples for LJL BioSystems common stock and
compared them with those of certain publicly traded companies that ING Barings
deemed relevant; (v) reviewed the results of operations of LJL BioSystems and
compared them with those of certain publicly traded companies that ING Barings
deemed relevant; (vi) participated in certain discussions among representatives
of Molecular Devices and LJL BioSystems and their financial and legal advisors;
(vii) reviewed a draft of the merger agreement; and (viii) reviewed such other
financial studies and analyses and took into account such other matters as ING
Barings deemed necessary, including ING Barings' assessment of general economic,
market and monetary conditions.

     The ING Barings opinion relates to the relative values of Molecular Devices
and LJL BioSystems common stock and the exchange ratio of LJL BioSystems common
stock for Molecular Devices common stock as provided in the merger agreement.
ING Barings did not express any opinion as to what the value of Molecular
Devices common stock actually will be when issued to the holders of the LJL
BioSystems common stock in the merger or the prices at which Molecular Devices
common stock will trade after the merger.

     In preparing their opinion, ING Barings assumed and relied on the accuracy
and completeness of all information supplied or otherwise made available to ING
Barings, discussed with or reviewed by or for ING Barings, or publicly
available. ING Barings also did not assume any responsibility for independently
verifying such information or for undertaking an independent evaluation or
appraisal of any of the assets or liabilities of Molecular Devices or LJL
BioSystems, and ING Barings has not been furnished with any such evaluation or
appraisal. In addition, ING Barings did not assume any obligation to conduct any
physical inspection of the properties or facilities of Molecular Devices or LJL
BioSystems. ING Barings expressed no view as to, and its opinion does not
address, the relative merits of the merger as compared to any alternative
business strategies that might exist for Molecular Devices or the effect of any
other transaction in which Molecular Devices might engage. With respect to the
financial forecast information furnished to or discussed with ING Barings by
Molecular Devices and LJL BioSystems, ING Barings assumed that they have been
reasonably prepared and reflect the best currently available estimates and
judgment of Molecular Devices' or LJL BioSystems' management as to the expected
future financial performance of Molecular Devices or LJL BioSystems.

                                       52
<PAGE>   61


THE FOLLOWING IS A BRIEF SUMMARY OF THE MATERIAL FINANCIAL AND COMPARATIVE
ANALYSES PERFORMED AND FACTORS CONSIDERED BY ING BARINGS IN CONNECTION WITH THE
RENDERING OF THE ING BARINGS OPINION AND REVIEWED WITH THE BOARD OF DIRECTORS OF
MOLECULAR DEVICES AT ITS JUNE 6, 2000 MEETING.


     HISTORICAL AND PROJECTED FINANCIAL POSITION. In rendering its opinion, ING
Barings reviewed and analyzed historical, current and projected financial
information of LJL BioSystems prepared by LJL BioSystems' management which
included LJL BioSystems' current and projected annual income statements.

     HISTORICAL EXCHANGE RATIO ANALYSIS. ING Barings compared the average of the
daily ratios of the closing price of LJL BioSystems common stock to the closing
price of Molecular Devices common stock over the period between March 13, 1998
and June 5, 2000 using closing prices provided by Factset Research. ING Barings
noted that the average of the daily ratios of the closing prices of LJL
BioSystems common stock compared to Molecular Devices common stock for the
period between March 13, 1998 and June 5, 2000 was 0.2194, compared to the
exchange ratio in the proposed transaction of 0.30 (the "Exchange Ratio").


     HISTORICAL STOCK PRICE PERFORMANCE VS. INDICES. ING Barings reviewed and
analyzed the daily closing per share market prices and trading volume for LJL
BioSystems common stock in the periods between (i) March 13, 1998 and June 5,
2000 and (ii) June 4, 1999 and June 5, 2000. In addition, ING Barings compared
the movement of such daily closing prices with the movement of the Standard &
Poor's 500 composite average (the "S&P 500") and the movement of a drug
discovery instrumentation composite average (consisting of Affymetrix Inc.,
Aurora Biosciences Corp., IGEN International Inc., Invitrogen Corp.,
Pharmacopeia Inc., Qiagen N.V. and Molecular Devices). This information was
presented to provide the Molecular Devices board with background information
regarding the stock price performance of LJL BioSystems over the period
indicated. ING Barings noted that, on a relative basis, the LJL BioSystems
common stock outperformed the S&P 500 and underperformed the drug discovery
instrumentation composite average for a majority of the indicated period.



     DISCOUNTED CASH FLOW ANALYSIS. ING Barings performed a discounted cash flow
analysis for LJL BioSystems using financial projections for years 2000 through
2003 provided by the management of LJL BioSystems, 2004 from research estimates
and 2005 based on ING Barings' estimates. ING Barings aggregated the present
value of the cash flows from 2001 through 2005 with the present value of a range
of terminal values. The terminal values were computed using a multiple of
projected EBITDA in calendar year 2005 and a range of terminal multiples of
16.0x to 20.0x. All cash flows were discounted at rates ranging from 15.0% to
17.0%. ING Barings arrived at such discount rates based on its judgment of the
weighted average cost of capital of LJL BioSystems and arrived at such terminal
values based on its review of the trading characteristics of the common stock of
selected publicly traded bioanalytical instrument companies (Aurora Biosciences
Corp., Caliper Technologies Corp., IGEN International Inc., Invitrogen Corp.,
Packard Bioscience Company, Pharmacopeia Inc., PE BioSystems and Qiagen N.V.
(collectively, the "Bioanalytical Instrument Companies")). This analysis
indicated a range of values for LJL BioSystems common stock of $19.23 to $25.00
per share. ING Barings noted that the implied offer price of $18.19 per share,
based on the Exchange Ratio multiplied by Molecular Devices stock price on June
5, 2000 of $60.63 per share ("the Offer") was below the valuation range and that
this fact supported a determination that the Exchange Ratio was fair to the
stockholders of Molecular Devices. ING Barings also performed a discounted cash
flow analysis for LJL BioSystems using financial projections for years 2000
through 2003 provided by the management of Molecular Devices, adjusted to
reflect estimated cost savings and an estimated cash restructuring charge to
achieve these savings, 2004 from research estimates, and 2005 based on ING
Barings' estimates. ING Barings aggregated the present value of the cash flows
from 2001 through 2005 with the present value of a range of terminal values.
Using the same terminal multiples and discount rates, the analysis indicated a
range of values for LJL BioSystems common stock of $24.04 to $31.43 per share.
ING Barings noted that the Offer was below the valuation range and that this
fact supported a determination that the Exchange Ratio was fair to the
stockholders of Molecular Devices.


                                       53
<PAGE>   62

     ANALYSIS OF PUBLICLY TRADED COMPANIES. ING Barings compared certain
financial information and commonly used valuation measurements for LJL
BioSystems to corresponding information for the Bioanalytical Instrument
Companies, which were selected as comparable publicly traded companies in the
bioanalytical instrument industry. Such financial information included, among
other things, (i) common equity market valuation ("Equity Value"); (ii) ratios
of Equity Value as adjusted for debt and cash ("Enterprise Value") to revenues,
for the latest reported 12 month period as derived from publicly available
information, and the projected periods for the fiscal years ended 2000, 2001 and
2002. The ratios set forth above were calculated using closing stock prices as
of June 5, 2000. ING Barings also computed such ratios for LJL BioSystems using
LJL BioSystems' Equity Value as implied in the Offer (the "Offer Equity Value")
and Enterprise Value as implied in the Offer (the "Offer Enterprise Value"),
where each was appropriate. The financial information used in connection with
the multiples of the Bioanalytical Instrument Companies provided below was based
on the latest reported 12 month period as derived from publicly available
information and on forecast results for calendar years 2000, 2001 and 2002 as
provided by brokerage security analysts.

     ING Barings informed the Molecular Devices Board that because the public
trading multiple ranges for the selected comparable companies were extremely
broad and the operations of LJL BioSystems are in the early stages of
development and therefore have not yet produced substantial earnings or cash
flow, ING Barings used the Mean and Median revenue multiples for the
Bioanalytical Instrument Companies.

     ING Barings noted that (a) the multiple of the Offer Enterprise Value to
trailing 12 month revenues was 23.2x for LJL BioSystems, compared to a range of
14.0x to 23.2x for the Bioanalytical Instrument Companies; (b) the multiple of
the Offer Enterprise Value to estimated 2000 revenues was 16.0x for LJL
BioSystems, compared to a range of 9.9x to 17.0x for the Bioanalytical
Instrument Companies; (c) the multiple of the Offer Enterprise Value to
estimated 2001 revenues was 7.3x for LJL BioSystems, compared to a range of 8.2x
to 10.7x for the Bioanalytical Instrument Companies; and (d) the multiple of the
Offer Enterprise Value to estimated 2002 revenues was 3.6x for LJL BioSystems,
compared to a range of 6.2x to 8.2x for the Bioanalytical Instrument Companies.
ING Barings also applied the multiple ranges indicated to the historical and
projected results of LJL BioSystems, resulting in implied equity values per
share of LJL BioSystems common stock of (i) $11.95 to $18.24 based on trailing
12 months revenues; (ii) $12.20 to $19.23 based on estimated 2000 revenues;
(iii) $20.10 to $25.50 based on estimated 2001 revenues; and (iv) $29.65 to
$38.44 based on estimated 2002 revenues. After comparing the foregoing multiples
to the Offer price of $18.19, ING Barings noted that the multiples implied in
the Offer were within the ranges of trading multiples for the Bioanalytical
Instrument Companies for the latest twelve months and 2000 and below the ranges
of trading multiples for 2001 and 2002; that the Offer price was within the
ranges of implied equity values per share for the latest twelve months and 2000
and below the ranges of implied equity values per share for 2001 and 2002; and
that these facts supported a determination that the Exchange Ratio was fair to
the stockholders of Molecular Devices.


     ANALYSIS OF SELECTED PRECEDENT TRANSACTIONS. ING Barings informed the
Molecular Devices board that, because of a lack of sufficient precedent
transaction data (as many of the acquirees in the selected transactions had no
earnings and no product sales when their respective transactions were effected),
there were a limited number of benchmark valuation multiples derivable from the
comparable transactions to apply to the merger. Furthermore, ING Barings
informed the Molecular Devices board that because the transaction multiples in
these transactions varied widely (reflecting a broad range of strategic
considerations which may have led to the transactions) and the operations of LJL
BioSystems are in the early stages of development and therefore have not yet
produced substantial earnings or cash flow, an analysis based on quantitative
comparison with these transactions would not be meaningful. Finally, ING Barings
informed the Molecular Devices board of directors that an appropriate use of
this analysis would involve qualitative judgments concerning differences between
the characteristics of those transactions and the proposed transaction that
could affect the acquisition value of the acquired companies and businesses in
the comparable analysis or the acquisition value of LJL BioSystems.


     TAKEOVER PREMIUM ANALYSIS. ING Barings reviewed the premiums paid in
twenty-one selected mergers and acquisitions since June 1999 in the life
sciences industry (the "Life Sciences Transactions").
                                       54
<PAGE>   63

ING Barings noted that (a) the mean premium paid per share in the Life Sciences
Transactions based on the closing stock price one day prior to announcement was
33.4% compared to the implied premium per share based on the Offer of 37.3%; and
(b) the mean premium paid per share in the Life Sciences Transactions based on
the closing stock price one month prior to announcement was 65.4% compared to
the implied premium per share based on the Offer of 67.3%. ING Barings noted
that based on the foregoing conclusions, the premiums implied in the Offer were
in line with the premiums paid in the Life Sciences Transactions and that this
fact supported a determination that the Exchange Ratio was fair to the
stockholders of Molecular Devices.

     IMPLIED PREMIUM ANALYSIS. ING Barings compared the Offer to the historical
stock prices of LJL BioSystems and the average prices of LJL BioSystems for the
periods ending June 5, 2000. The following table sets forth the implied premium
of the Offer per share of LJL BioSystems common stock to the historical prices,
provided by Factset Research for the periods ending June 5, 2000.

<TABLE>
<CAPTION>
                                                                 AVERAGE
                    IMPLIED PREMIUM TO:                       TRADING PRICE    PREMIUM
                    -------------------                       -------------    -------
<S>                                                           <C>              <C>
Closing Price as of June 5, 2000............................     $13.25          37.3%
5 Day Average Price.........................................      10.80          68.4%
15 Day Average Price........................................      10.01          81.7%
30 Day Average Price........................................      10.87          67.3%
60 Day Average Price........................................      13.47          35.0%
90 Day Average Price........................................      18.17           0.1%
52 Week High (March 3, 2000)................................      47.00         (61.3)%
52 Week Low (November 4, 1999)..............................       1.88         870.0%
</TABLE>

ING Barings noted that the Offer was at a discount to the 52 week high of LJL
BioSystems and that this fact supported a determination that the Exchange Ratio
was fair to the stockholders of Molecular Devices.

     CONTRIBUTION ANALYSIS. Based upon estimates from LJL BioSystems' and
Molecular Devices' management, ING Barings analyzed the respective contributions
of the revenues of LJL BioSystems (as provided by management and as adjusted by
Molecular Devices' management (the "LJL Conservative Revenues")) and of
Molecular Devices to the estimated revenues of the combined company for the
latest twelve months and for fiscal years 2000, 2001 and 2002. The actual
revenues achieved may vary from the estimated revenues and the variations may be
material.

<TABLE>
<CAPTION>
                                                           REVENUES               ADJUSTED REVENUES
                                                    ----------------------   ----------------------------
                                                    MOLECULAR      LJL       MOLECULAR   LJL CONSERVATIVE
                                                     DEVICES    BIOSYSTEMS    DEVICES        REVENUES
                                                    ---------   ----------   ---------   ----------------
<S>                                                 <C>         <C>          <C>         <C>
Latest Twelve Months..............................    84.8%        15.2%       84.8%           15.2%
Fiscal Year 2000 estimated........................    82.6%        17.4%       82.6%           17.4%
Fiscal Year 2001 estimated........................    73.2%        26.8%       76.5%           23.5%
Fiscal Year 2002 estimated........................    62.9%        37.1%       71.8%           28.2%
</TABLE>

ING Barings also analyzed the respective contributions of LJL BioSystems and
Molecular Devices based on discounted cash flow analysis and employee headcount.
The following tables set forth the results of this analysis.

<TABLE>
<CAPTION>
               RELATIVE DISCOUNTED
              CASH FLOW EQUITY VALUE
              ----------------------
<S>                                                 <C>
Molecular Devices.................................      67.6%
LJL BioSystems....................................      32.4%
</TABLE>

<TABLE>
<CAPTION>
                    EMPLOYEES
                    ---------
<S>                                                 <C>
Molecular Devices.................................      70.1%
LJL BioSystems....................................      29.9%
</TABLE>

                                       55
<PAGE>   64

As of the date of our opinion, based on the conversion of all vested options and
warrants for Molecular Devices and LJL BioSystems, LJL BioSystems stockholders
would own approximately 27.8% of the combined company and Molecular Devices
stockholders would own approximately 72.2% of the combined company. ING Barings
noted that the relative contribution of LJL BioSystems to the combined company
was consistent with the projected pro forma ownership of LJL BioSystems in the
combined company and that this fact supported a determination that the Exchange
Ratio was fair to the stockholders of Molecular Devices.

     RELEVANT MARKET AND ECONOMIC FACTORS. In rendering its opinion, ING Barings
considered, among other factors, the condition of the U.S. equity market and the
current level of economic activity, particularly in the bioanalytical
instruments industry. No company used in the analysis of publicly traded
companies nor any transaction used in the analysis of selected precedent
transactions summarized above is identical to LJL BioSystems or to the
transaction. In addition, ING Barings believes that both the analysis of certain
other publicly traded companies and the analysis of selected precedent
transactions are not simply mathematical. Rather, such analyses must take into
account differences in the financial and operating characteristics of these
companies and other factors, such as general economic conditions, conditions in
the markets in which such companies compete and strategic and operating plans
for such companies, that could affect the public trading value and acquisition
value of these companies.


     While the foregoing summary describes the analyses and factors that ING
Barings deemed material in its presentation to the board of directors of
Molecular Devices, it is not a comprehensive description of all analyses and
factors considered by ING Barings. The preparation of a fairness opinion is a
complex process involving various determinations as to the most appropriate and
relevant methods of financial analysis and the applications of these methods to
the particular circumstances and, therefore, such an opinion is not readily
susceptible to summary description. ING Barings believes that its analyses must
be considered as a whole and that selecting portions of its analyses and of the
factors considered by it, without considering all analyses and factors, would
create an incomplete view of the evaluation process underlying the ING Barings
opinion. In performing its analyses, ING Barings considered general economic,
market and financial conditions and other matters, many of which are beyond the
control of Molecular Devices and LJL BioSystems. The analyses performed by ING
Barings are not necessarily indicative of actual values or future results, which
may be significantly more or less favorable than those suggested by such
analyses. Accordingly, such analyses and estimates are inherently subject to
substantial uncertainty. Additionally, analyses relating to the value of a
business do not purport to be appraisals or to reflect the prices for which the
business actually may be purchased.


     ING Barings assumed that the merger will (i) qualify as a tax-free
"reorganization" pursuant to Section 368(a) of the Internal Revenue Code of
1986; (ii) be accounted for as a "pooling-of-interests" in accordance with U.S.
generally accepted accounting principles ("U.S. GAAP"); (iii) be consummated
without any regulatory limitations, restrictions, conditions, amendments or
modifications that collectively would have a material effect on LJL BioSystems
or Molecular Devices.

     The ING Barings opinion is necessarily based upon market, economic and
other conditions as they exist and can be evaluated on the basis of the
information made available to ING Barings as of the date of the ING Barings
opinion. ING Barings assumed that in the course of obtaining the necessary
regulatory or other consents or approvals (contractual or otherwise) for the
merger, no restrictions, including any divestiture requirements or amendments or
modifications, will be imposed that would have a material adverse effect on the
contemplated benefits of the merger. Furthermore, ING Barings assumed that none
of the merger, the pre-merger transactions or other transactions contemplated by
the merger will adversely affect the operations of Molecular Devices and LJL
BioSystems.

     The Molecular Devices board selected ING Barings to render a fairness
opinion because ING Barings is an internationally recognized investment banking
firm with substantial experience in transactions similar to the merger and
because it is familiar with Molecular Devices and its business. ING Barings is
continually engaged in the valuation of businesses and their securities in
connection with mergers and

                                       56
<PAGE>   65

acquisitions, leveraged buyouts, negotiated underwritings, secondary
distributions of listed and unlisted securities and private placements.


     Pursuant to a letter agreement dated November 16, 1999, Molecular Devices
has agreed to pay ING Barings a transaction fee equal to 1.25% of the aggregate
consideration payable in the transaction for its financial advisory services and
the delivery of the ING Barings opinion. In addition, Molecular Devices has
agreed to reimburse ING Barings for reasonable out-of-pocket expenses incurred
by ING Barings in performing its services, including the fees and expenses of
its legal counsel, and under certain circumstances to indemnify ING Barings and
certain related persons against certain liabilities, including certain
liabilities under the federal securities laws, arising out of its engagement.


     ING Barings has, in the past, provided financial advisory services to
Molecular Devices and may continue to do so and has received, and may receive,
fees for the rendering of such services. In addition, in the ordinary course of
its business, ING Barings may actively trade in the securities of Molecular
Devices or LJL BioSystems for its own account and for the accounts of customers
and, accordingly, may at any time hold a long or short position in such
securities.

OPINION OF LJL BIOSYSTEMS' FINANCIAL ADVISOR

     LJL BioSystems engaged Gleacher & Co. LLC to act as LJL BioSystems'
financial advisor in connection with the proposed merger between Molecular
Devices and LJL BioSystems and related matters based upon Gleacher & Co.'s
qualifications, expertise and reputation. In connection with this engagement,
LJL BioSystems requested Gleacher & Co. to evaluate the fairness, from a
financial point of view, of the exchange ratio, as provided in the merger
agreement, to LJL BioSystems stockholders. On June 6, 2000, the LJL BioSystems
board of directors convened (via telephone conference) to review the proposed
transaction with Molecular Devices and the terms of the merger agreement. During
this meeting, Gleacher & Co. rendered its oral opinion, subsequently confirmed
in writing on June 7, 2000, that, as of that date, based upon and subject to the
various considerations set forth in the Gleacher & Co. opinion, the exchange
ratio was fair, from a financial point of view, to LJL BioSystems stockholders.
Gleacher & Co. expressed no opinion as to the prices at which LJL BioSystems and
Molecular Devices Stock will trade following announcement of the execution of
the merger agreement or upon consummation of the transactions contemplated
thereby.

     THE FULL TEXT OF GLEACHER & CO.'S OPINION, WHICH SETS FORTH, AMONG OTHER
THINGS, ASSUMPTIONS MADE, PROCEDURES FOLLOWED, MATTERS CONSIDERED AND
LIMITATIONS ON THE REVIEW UNDERTAKEN IN CONNECTION WITH THE DELIVERY OF THIS
OPINION, IS ATTACHED AS ANNEX D TO THIS JOINT PROXY STATEMENT/PROSPECTUS. LJL
BIOSYSTEMS STOCKHOLDERS ARE URGED TO READ THE GLEACHER & CO. OPINION CAREFULLY
AND IN ITS ENTIRETY. THE SUMMARY OF THE OPINION OF GLEACHER & CO. SET FORTH IN
THIS JOINT PROXY STATEMENT/PROSPECTUS IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO THE FULL TEXT OF SUCH OPINION. GLEACHER & CO.'S OPINION IS ADDRESSED TO THE
LJL BIOSYSTEMS BOARD OF DIRECTORS AND IS DIRECTED ONLY TO THE FAIRNESS, FROM A
FINANCIAL POINT OF VIEW, OF THE EXCHANGE RATIO TO LJL BIOSYSTEMS STOCKHOLDERS
AND IS NOT INTENDED TO AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY
STOCKHOLDER OF LJL BIOSYSTEMS AS TO HOW SUCH STOCKHOLDER SHOULD VOTE WITH
RESPECT TO THE MERGER. ALTHOUGH GLEACHER & CO. EVALUATED THE FINANCIAL TERMS OF
THE MERGER AND PARTICIPATED IN DISCUSSIONS CONCERNING THE DETERMINATION OF THE
EXCHANGE RATIO, GLEACHER & CO. WAS NOT ASKED TO AND DID NOT RECOMMEND THIS
EXCHANGE RATIO, WHICH WAS THE RESULT OF ARM'S LENGTH NEGOTIATIONS BETWEEN LJL
BIOSYSTEMS AND MOLECULAR DEVICES.

     In connection with rendering its opinion, Gleacher & Co., among other
things:

     - reviewed certain publicly available financial statements and other
       information of LJL BioSystems and Molecular Devices;

     - reviewed certain internal financial statements and other financial and
       operating data concerning LJL BioSystems prepared by the management of
       LJL BioSystems;

     - analyzed certain financial projections prepared by the management of LJL
       BioSystems;

                                       57
<PAGE>   66

     - discussed the past and current operations and financial condition and the
       prospects of LJL BioSystems with senior executives of LJL BioSystems;

     - analyzed certain internal financial statements and other financial and
       operating data concerning Molecular Devices prepared by the management of
       Molecular Devices;

     - discussed the past and current operations and financial condition and the
       prospects of Molecular Devices with senior executives of Molecular
       Devices, and reviewed the pro forma financial impact of the merger on
       Molecular Devices;

     - analyzed certain financial projections prepared by the management of
       Molecular Devices;

     - reviewed the reported prices and trading activity for LJL BioSystems
       common stock and Molecular Devices common stock;

     - compared the financial performance of LJL BioSystems and Molecular
       Devices and the prices and trading activity of the LJL BioSystems common
       stock and the Molecular Devices common stock with that of certain other
       comparable publicly traded companies and their securities;

     - reviewed the financial terms, to the extent publicly available, of
       certain comparable acquisition transactions;

     - reviewed a draft of the merger agreement and certain related documents;
       and

     - performed such other analyses and considered such other factors as
       Gleacher & Co. has deemed appropriate.

     In rendering its opinion, Gleacher & Co. has assumed and relied upon
without independent verification the accuracy and completeness of the financial
and other information reviewed by it for the purposes of this opinion. With
respect to the financial projections, Gleacher & Co. has assumed that they have
been reasonably prepared on bases reflecting the best currently available
estimates and judgments of the senior management of LJL BioSystems and Molecular
Devices as to the future financial performance of LJL BioSystems and Molecular
Devices. Gleacher & Co. has relied upon without independent verification the
assumptions of the management of LJL BioSystems and Molecular Devices regarding
the pro forma financial impact of the merger on Molecular Devices. Gleacher &
Co. assumes no responsibility for and expresses no view as to such forecasts and
pro forma analyses or the assumptions on which they are based, and Gleacher &
Co. has relied upon the assurances of the senior management of LJL BioSystems
and Molecular Devices that they are unaware of any facts that would make the
information provided to or reviewed by Gleacher & Co. incomplete or misleading.
Gleacher & Co. has not made any independent valuation or appraisal of the assets
or liabilities of LJL BioSystems or Molecular Devices, nor has Gleacher & Co.
been furnished with any such valuations or appraisals. Gleacher & Co. has
assumed that the merger will be treated as a "pooling-of-interests" business
combination in accordance with U.S. generally accepted accounting principles and
will qualify as a "reorganization" within the meaning of Section 368(a) of the
Internal Revenue Code of 1986. Gleacher & Co. has also assumed that the merger
will be consummated in accordance with the terms set forth in the merger
agreement and that all of the representations and warranties of the parties to
the merger agreement are true, that the covenants of each party to the merger
agreement will be fully complied with, and that all conditions to the merger set
forth in the merger agreement will be satisfied and not waived. In addition,
Gleacher & Co. has taken into account its past efforts to solicit interest from
potential third party acquirors, although Gleacher & Co. was not requested to
solicit interest from third parties in connection with the proposed merger.
Gleacher & Co.'s opinion is necessarily based on economic, market and other
conditions as in effect on, and the information made available to it as of, June
7, 2000.

     The following is a brief summary of the material valuation, financial and
comparative analyses considered by Gleacher & Co. in connection with the
rendering of its opinion. This summary does not purport to be a complete
description of the analyses underlying the Gleacher & Co. opinion. The following
summary of the analyses contains information in tabular format. In order fully
to understand the financial

                                       58
<PAGE>   67

analyses used by Gleacher & Co., the tables must be read in conjunction with the
text of each summary. The tables alone do not constitute a complete description
of the financial analyses summarized therein.

     TRANSACTION SUMMARY. Gleacher & Co. reviewed the principal terms of the
merger agreement, noting, among other things, that:

     - the exchange ratio is fixed at 0.30 of a share of Molecular Devices
       common stock per share of LJL BioSystems common stock with no "collar";
       namely, that the exchange ratio is fixed, regardless of the relative
       subsequent trading ranges of Molecular Devices common stock and LJL
       BioSystems common stock;

     - the merger agreement provides for a voting agreement whereby certain
       members of LJL BioSystems' management and board of directors have agreed
       to vote their shares, representing approximately 25% of the LJL
       BioSystems shares outstanding, in favor of the merger agreement;

     - the merger agreement provides for a termination fee of $9.0 million, in
       the event of a superior offer (as defined therein), subject to certain
       provisions of the merger agreement;

     - the merger is expected to be treated as a "pooling-of-interests" business
       combination in accordance with U.S. generally accepted accounting
       principles; and

     - the merger is expected to qualify as a "reorganization" within the
       meaning of Section 368(a) of the Internal Revenue Code of 1986.

     HISTORICAL STOCK PRICE PERFORMANCE AND IMPLIED MARKET EXCHANGE RATIOS AND
PREMIUMS. Gleacher & Co. reviewed the historical closing stock prices of
Molecular Devices common stock and LJL BioSystems common stock and the implied
market exchange ratios, determined by dividing the closing price per share of
LJL BioSystems common stock by the closing price per share of Molecular Devices
common stock, on various dates and over various periods of time. The following
table shows (i) the market exchange ratio as of June 7, June 6, June 5 and June
2, 2000, as well as the average market exchange ratio for various periods
leading up to and including June 7, 2000, and (ii) the premium of the exchange
ratio pursuant to the merger agreement to these market exchange ratios:

<TABLE>
<CAPTION>
                                                         MERGER EXCHANGE
                                              MARKET      RATIO PREMIUM
                                             EXCHANGE       TO MARKET
               DATE/PERIOD*                   RATIO      EXCHANGE RATIO
               ------------                  --------    ---------------
<S>                                          <C>         <C>
As of June 7, 2000.........................   0.275x           9.0%
As of June 6, 2000.........................   0.270           11.1
As of June 5, 2000.........................   0.219           37.3
As of June 2, 2000.........................   0.183           63.8
10 Trading Days............................   0.208           44.3
20 Trading Days............................   0.216           38.7
30 Trading Days............................   0.225           33.6
50 Trading Days............................   0.231           29.9
100 Trading Days...........................   0.289            4.0
150 Trading Days...........................   0.234           28.1
250 Trading Days...........................   0.191           57.2
</TABLE>

-------------------------
* Trading periods are up to and including June 7, 2000.


     Gleacher & Co. also analyzed the stock price performance of LJL BioSystems
as compared to Molecular Devices, the LJL BioSystems Comparable Companies
(defined below) and the Molecular Devices Comparable Companies (defined below)
over the four trading days leading up to and including June 7, 2000. From June
2, 2000 to June 7, 2000, LJL BioSystems' share price increased 36.1%, compared
to a mean increase of 18.3% (ranging from 0.4% to 36.5%) for the LJL BioSystems
Comparable Companies, and Molecular Devices' share price declined 9.4%, compared
to a mean increase of 7.3% (ranging from -6.2% to 40.8%) for the Molecular
Devices Comparable Companies.

                                       59
<PAGE>   68

     COMPARABLE COMPANY ANALYSIS. Gleacher & Co. reviewed the relative
performance and value of each of Molecular Devices and LJL BioSystems by
comparing certain market trading statistics for Molecular Devices and LJL
BioSystems with other publicly traded companies that Gleacher & Co. considered
to be broadly comparable to Molecular Devices and LJL BioSystems, respectively.

     For LJL BioSystems, the selected comparison group included a total of five
companies: ArQule, Inc.; Aurora Biosciences Corporation; IGEN International,
Inc.; Invitrogen Corporation; and QIAGEN N.V. (the "LJL BioSystems Comparable
Companies"). Market information used in the ratios provided below is as of June
7, 2000. This analysis showed, among other things, that the ratio of enterprise
value to historical revenues for LJL BioSystems over the latest twelve months
(LTM) and expected revenues for LJL BioSystems for calendar years 2000 and 2001
was 20.5x, 14.2x and 9.2x, respectively. This compares to a mean of 18.8x
(ranging from 4.8x to 37.5x), 14.3x (ranging from 2.6x to 29.3x) and 10.9x
(ranging from 2.3x to 22.4x) for the enterprise value multiples of LTM, expected
2000 and expected 2001 revenues, respectively, for the LJL BioSystems Comparable
Companies. 2000 and 2001 expected revenues were based upon estimates of various
Wall Street research analysts for LJL BioSystems and the LJL BioSystems
Comparable Companies.

     For Molecular Devices, the selected comparison group included a total of
eight companies: Beckman Coulter, Inc.; Becton, Dickinson and Company; Nycomed
Amersham plc; Packard BioScience Company; PE Corp-PE Biosystems Group;
PerkinElmer, Inc.; Pharmacopeia, Inc.; and Waters Corporation (the "Molecular
Devices Comparable Companies"). Market information used in the ratios provided
below is as of June 7, 2000. This analysis showed, among other things, that the
ratio of price per common share to expected earnings per share (EPS) for
Molecular Devices for calendar years 2000 and 2001 was 47.0x and 36.8x,
respectively. This compares to a mean of 52.9x (ranging from 15.2x to 135.7x)
and 37.8x (ranging from 13.5x to 73.9x) for the share price multiples of 2000
and 2001 calendar year expected EPS, respectively, for the Molecular Devices
Comparable Companies. This analysis also showed, among other things, that the
ratio of price per common share to expected EPS for Molecular Devices for
calendar year 2000 divided by the Institutional Brokers Estimate System expected
long-term EPS growth rate for Molecular Devices was 1.9x. This compares to a
mean of 2.4x (ranging from 1.1x to 5.4x) for the Molecular Devices Comparable
Companies. Expected EPS figures and long-term EPS growth rates were based on
Institutional Brokers Estimate System mean estimates.

     No company used in the comparable company analysis is identical to LJL
BioSystems or Molecular Devices. Accordingly, comparable company analysis
necessarily involves complex considerations and judgments concerning differences
in financial and operating characteristics of LJL BioSystems and Molecular
Devices and other factors that could affect the public trading value of the
companies to which they are being compared. Mathematical analysis (such as
determining the mean or median) is not in itself a meaningful method of using
comparable company data.

     SELECTED TRANSACTION ANALYSIS. Gleacher & Co. reviewed the premiums and
multiples paid in certain selected precedent transactions announced in recent
years. Premiums to the target's stock price as of one day, one week and one
month prior to the announcement of the transaction and enterprise value
multiples of LTM revenues and one-year forward revenues implied by the
consideration to be received by stockholders of LJL BioSystems in the merger
were compared with premiums paid and revenue multiples paid in the selected
precedent transactions. The selected comparison group included a total of eleven
transactions:

     - Thermo BioAnalysis Corp. acquisition by Thermo Instrument Systems Inc.;

     - Life Technologies, Inc. announced pending acquisition by Dexter
       Corporation;

     - Research Genetics, Inc. acquisition by Invitrogen Corp.;

     - Genetic MicroSystems, Inc. acquisition by Affymetrix Inc.;

     - Novex Corporation acquisition by Invitrogen Corp.;

     - Ribi Immunochem Research Inc. acquisition by Corixa Corporation;
                                       60
<PAGE>   69

     - Clontech Laboratories, Inc. acquisition by Becton, Dickinson and Company;

     - CN Biosciences, Inc. acquisition by EM Industries, Inc.;

     - Molecular Dynamics, Inc. acquisition by Amersham Pharmacia Biotech Inc.;

     - Synteni, Inc. acquisition by Incyte Pharmaceuticals Inc.; and

     - PerSeptive Biosystems, Inc. acquisition by Perkin-Elmer Corp. (the
       "Selected Transactions").


     This analysis showed, among other things, that the mean of the premiums
paid to the target price one day, one week and one month prior to the
announcement was 26.4% (ranging from 8.1% to 51.4%), 25.3% (ranging from -4.3%
to 55.6%) and 38.9% (ranging from -3.4% to 101.2%), respectively, for the
Selected Transactions, compared to 9.0%, 95.5% and 42.5%, respectively, for the
merger. The mean LTM revenue multiple for the Selected Transactions was 9.8x
(ranging from 2.1x to 43.3x), compared to 22.3x for the merger. The mean
one-year forward revenue multiple for the Selected Transactions was 2.7x
(ranging from 1.9x to 3.4x), compared to 15.4x for the merger.


     No transaction used in the selected transaction analysis is identical to
the merger. Accordingly, selected transaction analysis necessarily involves
complex considerations and judgments concerning differences in financial and
operating characteristics of LJL BioSystems and other factors that could affect
the value of the companies to which it is being compared and of the transactions
to which the merger is being compared. Mathematical analysis (such as
determining the mean or median) is not in itself a meaningful method of using
selected transaction data.

     DISCOUNTED CASH FLOW ANALYSIS. Gleacher & Co. performed a discounted cash
flow analysis to calculate an estimate of the present fully-diluted equity value
per share of each of LJL BioSystems and Molecular Devices using financial
forecasts through 2003 and 2004 for LJL BioSystems and Molecular Devices,
respectively, that were provided by LJL BioSystems and Molecular Devices
management, respectively.

     For LJL BioSystems, Gleacher & Co. utilized discount rates ranging from
15.0% to 17.0% (based on an estimate of LJL BioSystems' weighted average cost of
capital) and earnings before interest, taxes, depreciation and amortization
("EBITDA") terminal value multiples ranging from 14.0x to 22.0x applied to
forecasted EBITDA for the year 2003 (implying, at a 16.0% discount rate, a range
of perpetual free cash flow growth rates of 13.1% to 14.1%). This analysis
showed, among other things, a range of present values per fully diluted LJL
BioSystems share of $13.84 to $21.53. This compares to a per share value of
$17.72 implied by Molecular Devices' closing price on June 7, 2000 of $59.06 and
the exchange ratio of 0.30. This analysis did not purport to be indicative of
actual values or expected values of the shares of LJL BioSystems common stock
before or after the merger.

     For Molecular Devices, Gleacher & Co. utilized discount rates ranging from
10.0% to 12.0% (based on an estimate of Molecular Devices' weighted average cost
of capital) and EBITDA terminal value multiples ranging from 14.0x to 22.0x
applied to forecasted EBITDA for the year 2004 (implying, at an 11.0% discount
rate, a range of perpetual free cash flow growth rates of 7.0% to 8.5%). This
analysis showed, among other things, a range of present values per fully diluted
Molecular Devices share of $49.58 to $74.21. This compares to Molecular Devices'
closing price on June 7, 2000 of $59.06. This analysis did not purport to be
indicative of actual values or expected values of the shares of Molecular
Devices common stock before or after the merger.

     CONTRIBUTION ANALYSIS. Gleacher & Co. analyzed the relative revenue
contribution of LJL BioSystems and Molecular Devices to the pro forma combined
company resulting from the merger, before taking into account any of the
possible benefits that may be realized following the merger, for calendar years
2000, 2001 and 2002. This analysis showed, among other things, that LJL
BioSystems is expected to contribute 17.4%, 26.3% and 36.4% and Molecular
Devices is expected to contribute 82.6%, 73.7% and 63.6% of revenues in years
2000, 2001 and 2002, respectively. The estimates were based on LJL BioSystems'
management's and Molecular Devices' management's projections, respectively.
Gleacher & Co. compared

                                       61
<PAGE>   70

the above results with the expected percentage of ownership of LJL BioSystems
stockholders in the merged company of approximately 27.9% and 27.5% on a primary
and fully converted basis, respectively.

     The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to a partial analysis or summary description. Gleacher &
Co. believes that its analyses must be considered as a whole and that selecting
portions of its analyses, without considering all analyses, would create an
incomplete view of the process underlying its opinion and the presentation to
the LJL BioSystems board of directors. Gleacher & Co. has not indicated that any
of the analyses which it performed had a greater significance from any other. In
addition, Gleacher & Co. may have deemed various assumptions more or less
probable than other assumptions, so that the ranges of valuations resulting from
any particular analysis described above should not be taken to be Gleacher &
Co.'s view of the actual value of LJL BioSystems, Molecular Devices or the
combined company.

     In performing its analyses, Gleacher & Co. made numerous assumptions with
respect to industry performance, general business and economic conditions and
other matters, many of which are beyond the control of either LJL BioSystems or
Molecular Devices. The analyses performed by Gleacher & Co. are not necessarily
indicative of actual values, which may be significantly more or less favorable
than suggested by such analyses. Such analyses were prepared solely as a part of
Gleacher & Co.'s analysis of the fairness of the exchange ratio to LJL
BioSystems and were provided to the LJL BioSystems board of directors in
connection with the delivery of Gleacher & Co.'s opinion. The analyses do not
purport to be appraisals or necessarily reflect the prices at which businesses
or securities might actually be sold, which are inherently subject to
uncertainty. In addition, as described above, Gleacher & Co.'s opinion and
presentation to the LJL BioSystems board of directors was one of many factors
taken into consideration by the LJL BioSystems board of directors in making its
determination to approve the merger. Consequently, the Gleacher & Co. analyses
described above should not be viewed as determinative of the LJL BioSystems
board of directors' or LJL BioSystems management's opinion with respect to the
merger.

     Gleacher & Co. is an internationally recognized investment banking and
advisory firm that regularly engages in the valuation of businesses and their
securities in connection with mergers and acquisitions.

     LJL BioSystems has agreed to pay Gleacher & Co. a financial advisory fee of
$5.0 million pursuant to the terms of its engagement letter dated May 18, 1999,
as amended on June 6, 2000. In addition, LJL BioSystems has agreed, among other
things, to reimburse Gleacher & Co. for all reasonable out-of-pocket expenses
incurred in connection with the services provided by Gleacher & Co., and to
indemnify and hold harmless Gleacher & Co. and certain related parties from and
against certain liabilities and expenses, including certain liabilities under
the federal securities laws, in connection with its engagement.

INTERESTS OF LJL BIOSYSTEMS' OFFICERS AND DIRECTORS IN THE MERGER


     In considering the recommendation of the LJL BioSystems board of directors
with respect to adopting the merger agreement, the LJL BioSystems stockholders
should be aware that certain members of the board of directors and management of
LJL BioSystems have interests in the merger that are in addition to the
interests of stockholders of LJL BioSystems generally. The LJL BioSystems board
of directors was aware of these interests and considered them, among other
matters, in approving the principal terms of the merger, the merger agreement
and the merger transactions.


     COMBINED COMPANY BOARD OF DIRECTORS. The merger agreement provides that as
a condition to LJL BioSystems' obligation to consummate the merger, Lev J.
Leytes must have been duly appointed to the board of directors of Molecular
Devices.

     INDEMNIFICATION AND INSURANCE. The merger agreement provides for the
survival after the merger of all indemnification rights of the members of the
board directors and officers of LJL BioSystems for acts and omissions occurring
before the merger, as their rights existed as of June 7, 2000, in the LJL
BioSystems bylaws and in indemnification agreements with LJL BioSystems.
Molecular Devices will guarantee that the surviving company observes all of
these indemnification rights to the fullest extent permitted by Delaware law for
a period of five years after the merger. In addition, for a period of five

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years after the merger, Molecular Devices will maintain a directors' and
officers' liability insurance policy covering those persons who are currently
covered by LJL BioSystems' directors' and officers' liability insurance policy
with coverage in amount and scope at least as favorable as LJL BioSystems'
existing coverage. If the annual premiums of such insurance coverage exceed
$75,000, Molecular Devices will obtain a policy with the greatest coverage
available for a cost not exceeding that amount.

     AUTOMATIC ACCELERATION OF STOCK OPTIONS; SEVERANCE PAYMENTS. Before the
initiation of discussions relating to the merger, LJL BioSystems entered into
agreements containing change in control provisions with Lev J. Leytes, the
President, Chief Executive Officer and Chairman of the Board of LJL BioSystems,
Larry Tannenbaum, the Senior Vice President and Chief Financial Officer of LJL
BioSystems, Richard M. Eglen, Ph.D, the Senior Vice President of Assay
Technologies of LJL BioSystems, Daniel S. Janney, a director of LJL BioSystems,
Michael F. Bigham, a director of LJL BioSystems, George Dunbar, a director of
LJL BioSystems and John G. Freund, M.D., a director of LJL BioSystems. These
arrangements provide for benefits if there is a change in control of LJL
BioSystems. The merger is a change in control for this purpose.


     DIRECTORS' PLAN AND RESTRICTED STOCK ACCELERATION. Under the LJL BioSystems
Directors' Stock Option Plan, all unvested options will become exercisable
immediately before the completion of a change in control. The merger is a change
in control for this purpose. Therefore, all options held by the four non-
employee directors of LJL BioSystems under this plan will be fully vested
immediately before the effective time of the merger. In addition, shares of
restricted stock held by certain directors will become fully vested immediately
prior to the consummation of the merger.



     PROFESSIONAL FEE. The Bay City Capital Fund I, L.P. provided certain
financial advice to LJL BioSystems in connection with the merger and will
receive a $200,000 fee in connection therewith. John D. Diekman, Ph.D, a former
member of the board of directors of LJL BioSystems, and a partner of The Bay
City Capital Fund I, L.P., was a member of the board at the time of the board's
approval of the merger and the merger agreement.


MATERIAL FEDERAL INCOME TAX CONSEQUENCES


     The following discussion summarizes the material federal income tax
considerations of the merger that are expected to apply generally to LJL
BioSystems stockholders upon an exchange of their LJL BioSystems common stock
for Molecular Devices common stock in the merger. This summary is based upon
current provisions of the Internal Revenue Code, existing regulations under the
Internal Revenue Code and current administrative rulings and court decisions,
all of which are subject to change. Any change, which may or may not be
retroactive, could alter the tax consequences to Molecular Devices, LJL
BioSystems or the stockholders of LJL BioSystems as described in this summary.
No attempt has been made to comment on all federal income tax consequences of
the merger that may be relevant to particular stockholders, including
stockholders:


     - who are subject to special tax rules such as dealers in securities,
       foreign persons, mutual funds, insurance companies, tax-exempt entities;

     - who are subject to the alternative minimum tax provisions of the Internal
       Revenue Code;

     - who acquired their shares in connection with stock option or stock
       purchase plans or in other compensatory transactions;

     - who hold their shares as a hedge or as part of a hedging, straddle or
       other risk reduction strategy;

     - whose shares are qualified small business stock for purposes of Section
       1202 of the Internal Revenue Code; and

     - who do not hold their shares as capital assets.

     In addition, the following discussion does not address the tax consequences
of the merger under state, local and foreign tax laws. Furthermore, the
following discussion does not address (i) the tax consequences

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<PAGE>   72


of transactions effectuated before, after or at the same time as the merger,
whether or not they are in connection with the merger, including, without
limitation, transactions in which shares of LJL BioSystems common stock are
acquired or shares of Molecular Devices common stock are disposed of, (ii) the
tax consequences to holders of options issued by LJL BioSystems which are
assumed, exercised or converted, as the case may be, in connection with the
merger, (iii) the tax consequences of the receipt of shares of Molecular Devices
common stock other than in exchange for shares of LJL BioSystems common stock,
or (iv) the tax implications of a failure of the merger to qualify as a
reorganization. Accordingly, holders of LJL BioSystems common stock are advised
and expected to consult their own tax advisers regarding the federal income tax
consequences of the merger in light of their personal circumstances and the
consequences under state, local and foreign tax laws.


     It is a condition to the consummation of the merger that Cooley Godward LLP
and Venture Law Group, A Professional Corporation, must render tax opinions that
the merger will constitute a reorganization within the meaning of Section 368(a)
of the Internal Revenue Code (a "Reorganization"). The tax opinions discussed in
this section assume and are conditioned upon the following:

     - the truth and accuracy of the statements, representations and warranties
       contained in the merger agreement, in the tax certificates to be received
       from Molecular Devices, Merger Sub and LJL BioSystems to support the tax
       opinions and in all other instruments and documents related to the
       formation, organization and operation of Molecular Devices, Merger Sub
       and LJL BioSystems examined by and relied upon by Cooley Godward LLP and
       Venture Law Group, A Professional Corporation, in connection with the
       merger;

     - that original documents submitted to such counsel are authentic,
       documents submitted to such counsel as copies conform to the original
       documents, and that all of these documents have been (or will be by the
       effective time) duly and validly executed and delivered where due
       execution and delivery are a prerequisite to the effectiveness of these
       documents;

     - that all covenants contained in the merger agreement and the tax
       certificates, described above, are performed without waiver or breach of
       any material provision of these covenants; and

     - that any representation or statement made "to the best of knowledge" or
       similarly qualified is correct without that qualification.

     No ruling from the Internal Revenue Service has been or will be requested
in connection with the merger. In addition, stockholders of LJL BioSystems
should be aware that the tax opinions discussed in this section are not binding
on the IRS, the IRS could adopt a contrary position and a contrary position
could be sustained by a court.

     Subject to the assumptions and limitations discussed above, it is the
opinion of Cooley Godward LLP, tax counsel to Molecular Devices, and Venture Law
Group, A Professional Corporation, tax counsel to LJL BioSystems, that:

     - the merger will be treated for federal income tax purposes as a
       Reorganization;

     - Molecular Devices, Merger Sub and LJL BioSystems will each be a party to
       the Reorganization;

     - Molecular Devices, Merger Sub and LJL BioSystems will not recognize any
       gain or loss solely as a result of the merger;

     - stockholders of LJL BioSystems will not recognize any gain or loss upon
       the receipt of solely Molecular Devices common stock for their LJL
       BioSystems common stock, other than with respect to cash received in lieu
       of fractional shares of Molecular Devices common stock;


     - the aggregate basis of the shares of Molecular Devices common stock
       received by an LJL BioSystems stockholder in the merger (including any
       fractional share of Molecular Devices common stock deemed received) will
       be the same as the aggregate basis of the shares of LJL BioSystems common
       stock surrendered in exchange therefor;


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<PAGE>   73

     - the holding period of the shares of Molecular Devices common stock
       received by an LJL BioSystems stockholder in the merger will include the
       holding period of the shares of LJL BioSystems common stock surrendered
       in exchange therefor; and


     - a stockholder of LJL BioSystems who receives cash in lieu of a fractional
       share of Molecular Devices common stock will recognize capital gain or
       loss equal to the difference, if any, between such stockholder's basis in
       the fractional share of Molecular Devices common stock and the amount of
       cash received.


     LJL BioSystems stockholders will be required to attach a statement to their
federal income tax returns for the year of the merger that contains the
information listed in Treasury Regulation Section 1.368-3(b). Such statement
must include the stockholder's tax basis in the stockholder's LJL BioSystems
common stock and a description of the Molecular Devices common stock received.

     Irrespective of the merger's status as a Reorganization, a LJL BioSystems
stockholder will recognize gain to the extent shares of Molecular Devices common
stock received in the merger are treated as received in exchange for services or
property other than solely LJL BioSystems common stock. All or a portion of any
such gain could be taxable as ordinary income. Gain also will be recognized to
the extent a LJL BioSystems stockholder is treated as receiving (directly or
indirectly) consideration other than Molecular Devices common stock in exchange
for LJL BioSystems common stock or to the extent the LJL BioSystems common stock
surrendered in the merger is not equal in value to the Molecular Devices common
stock received in exchange therefor.

ANTICIPATED ACCOUNTING TREATMENT

     The merger is expected to be accounted for using the "pooling of interests"
method of accounting pursuant to Opinion No. 16 of the Accounting Principles
Board and related interpretations. The pooling of interests method of accounting
assumes that the combining companies have been merged from inception, and the
historical consolidated financial statements for periods prior to consummation
of the merger are restated as though the companies had been combined from
inception. Subject to payment of a $5.0 million termination fee, Molecular
Devices may terminate the merger agreement if the merger cannot be accounted for
as a pooling of interests.

GOVERNMENTAL APPROVALS

     Transactions such as the merger are subject to review by the Department of
Justice and the FTC to determine whether they comply with applicable antitrust
laws. Under the provisions of the HSR Act, the merger may not be consummated
until the specified waiting period requirements of the HSR Act have been
satisfied. Molecular Devices and LJL BioSystems filed notification reports,
together with requests for early termination of the waiting period, with the
Department of Justice and the FTC under the HSR Act on June 27, 2000 and the
waiting period terminates on July 27, 2000 unless extended.

RESTRICTIONS ON RESALES BY AFFILIATES

     The shares of Molecular Devices common stock to be received by LJL
BioSystems stockholders in the merger have been registered under the Securities
Act and, except as described in this paragraph, may be freely traded without
restriction. The shares of Molecular Devices common stock to be issued in the
merger and received by persons who may be considered to be "affiliates" (as that
term is defined in Rule 144 under the Securities Act) of LJL BioSystems before
the merger may be resold by them only in transactions permitted by the resale
provisions of Rule 145 under the Securities Act or as otherwise permitted under
the Securities Act. Under guidelines published by the SEC, the sale or other
disposition of Molecular Devices common stock or LJL BioSystems common stock by
an affiliate of either Molecular Devices or LJL BioSystems within 30 days before
the effective time or the sale or other disposition of Molecular Devices common
stock after the merger and before the publication of financial results that
include at least 30 days of post-merger combined operations of Molecular Devices
and LJL BioSystems could preclude pooling of interests accounting treatment of
the merger. Accordingly, the merger agreement
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<PAGE>   74

provides that Molecular Devices and LJL BioSystems will obtain a signed
affiliate agreement from all persons who may be considered to be their
affiliates. The affiliate agreements provide that these persons will not sell,
transfer or otherwise dispose of any shares of Molecular Devices common stock or
LJL BioSystems common stock during the pooling period referred to above and,
with respect to affiliates of LJL BioSystems, that they will not sell, transfer
or otherwise dispose of Molecular Devices common stock at any time in violation
of the Securities Act or the rules and regulations promulgated under the
Securities Act, including Rule 145. As indicated under "-- Anticipated
Accounting Treatment," Molecular Devices and LJL BioSystems have obtained
executed affiliate agreements from all persons known to the managements of
Molecular Devices or LJL BioSystems to be affiliates of such corporations.

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<PAGE>   75

                     CERTAIN TERMS OF THE MERGER AGREEMENT

     The following description of the merger agreement describes the material
terms of the merger agreement. The full text of the merger agreement is attached
as Annex A to this joint proxy statement/ prospectus and is incorporated herein
by reference. We encourage you to read the entire merger agreement.

THE MERGER


     The merger agreement provides that at the effective time, Mercury
Acquisition will be merged with and into LJL BioSystems. Upon completion of the
merger, LJL BioSystems will continue as the surviving corporation and will be a
wholly-owned subsidiary of Molecular Devices.


EFFECTIVE TIME OF THE MERGER

     The merger shall take effect at the time the certificate of merger is filed
with the Secretary of State of the State of Delaware or at such later time as
may be specified in the certificate of merger. If all the conditions to the
merger agreement are satisfied or waived, we anticipate that the filing of the
certificate of merger will occur no later than the second business day after
such satisfaction or waiver.

MANNER AND BASIS OF CONVERTING SHARES

     At the effective time, each share of LJL BioSystems common stock will
automatically be converted into 0.30 of a share of Molecular Devices common
stock. This fraction is referred to in this Joint Proxy Statement/Prospectus as
the "exchange ratio."


     As soon as practicable following the effective time, Molecular Devices will
deposit with EquiServe, L.P., which Molecular Devices has selected as the
exchange agent, (1) certificates representing the shares of Molecular Devices
common stock issuable under the Merger Agreement and (2) a sufficient amount of
cash to provide for cash payments in lieu of fractional shares of Molecular
Devices common stock. Following the effective time, EquiServe will mail to each
record holder of LJL BioSystems common stock a transmittal letter, which record
holders will use to exchange LJL BioSystems common stock certificates for
Molecular Devices common stock certificates, and cash for any fractional shares.
Upon surrender of a LJL BioSystems stock certificate to EquiServe, together with
a duly executed letter of transmittal and other documents reasonably requested
by EquiServe or Molecular Devices, the holder of the LJL BioSystems stock
certificate shall be entitled to receive a certificate representing the number
of whole shares of Molecular Devices common stock which such holder has the
right to receive under the merger agreement in exchange for the shares formerly
represented by the LJL BioSystems stock certificate and cash in lieu of any
fractional shares of Molecular Devices common stock. Immediately following the
surrender of a LJL BioSystems stock certificate to EquiServe for this exchange,
the LJL BioSystems stock certificate shall be cancelled. 360 days following the
effective time, Molecular Devices has the right to demand return of all
certificates representing shares of Molecular Devices common stock and cash for
payment in lieu of fractional shares of Molecular Devices common stock which
then remain undistributed in exchange for certificates of LJL BioSystems common
stock. Following such request, stockholders who have yet to surrender their LJL
BioSystems stock certificates to EquiServe should seek to exchange their
certificates with Molecular Devices for certificates representing Molecular
Devices common stock, together with cash in lieu of fractional shares of
Molecular Devices common stock.


     If any shares of the outstanding common stock of LJL BioSystems immediately
prior to the effective time are unvested or subject to a repurchase option, risk
of forfeiture or other similar condition, then the shares of Molecular Devices
common stock issued in exchange for such shares will also be unvested or subject
to the same repurchase option, risk of forfeiture or other similar condition.


     No fractional shares of Molecular Devices common stock will be issued in
the merger. Instead, each LJL BioSystems stockholder entitled to a fractional
share of Molecular Devices common stock will receive a cash amount (rounded to
the nearest whole cent), without interest, based on the closing price for


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Molecular Devices common stock on the Nasdaq National Market on the second day
before the closing date.


     Without any further action on the part of Molecular Devices, LJL BioSystems
or Merger Sub, after the effective time, until it is surrendered and exchanged,
each LJL BioSystems stock certificate shall be deemed to represent only the
right to receive shares of Molecular Devices common stock and the right to
receive cash in lieu of any fractional share of Molecular Devices common stock.
Molecular Devices will not pay dividends or other distributions on any shares of
Molecular Devices common stock to be issued in exchange for any unsurrendered
LJL BioSystems common stock certificate until the LJL BioSystems common stock
certificate is surrendered as provided in the merger agreement.



     If between the date of the merger agreement and the effective time of the
merger, the outstanding shares of LJL BioSystems common stock or Molecular
Devices common stock are changed into a different number or class of shares, by
reason of any stock split, divisions or subdivision of shares, stock dividend,
reverse stock split, consolidation of shares, reclassification, recapitalization
or other similar transaction, the exchange ratio will be properly adjusted.


LJL BIOSYSTEMS STOCK OPTIONS AND WARRANTS

     At the effective time, Molecular Devices will assume each outstanding LJL
BioSystems stock option and warrant. Each outstanding LJL BioSystems stock
option and warrant will be converted into and become rights to purchase the
number of shares of Molecular Devices common stock determined by multiplying the
number of shares of LJL BioSystems common stock subject to such LJL BioSystems
stock option or warrant immediately prior to the effective time by the exchange
ratio rounding down to the nearest whole share. The per share exercise price
under each such LJL BioSystems option and warrant will be adjusted by dividing
the per share exercise price under the LJL BioSystems option or warrant by the
exchange ratio. All other terms and conditions of the LJL BioSystems stock
options and warrants will not change and will operate in accordance with their
terms. The parties intend that the LJL BioSystems incentive stock options
assumed by Molecular Devices will continue to qualify as incentive stock options
for federal income tax purposes.


LJL BIOSYSTEMS' EMPLOYEE STOCK PURCHASE PLAN


     LJL BioSystems' Employee Stock Purchase Plan will be terminated at the
effective time. The last business day before the effective time will be treated
as the last day of each offering period then underway under the Employee Stock
Purchase Plan. Pro-rata adjustments may be required under the Employee Stock
Purchase Plan to reflect each reduced offering period, but each offering period
will otherwise be treated as a fully effective and completed offering period for
all purposes of the plan. The change in each offering period described above is
conditioned upon the completion of the merger.

CONTINUATION OF BENEFITS

     All employees of LJL BioSystems who continue employment with Molecular
Devices or LJL BioSystems after the effective time will be eligible to
participate in Molecular Devices' health, vacation and other employee benefit
plans to the same extent as current employees of Molecular Devices in similar
positions and at similar grade levels. Employees of LJL BioSystems who continue
employment with Molecular Devices or LJL BioSystems may also participate in
Molecular Devices' employee stock purchase plan upon the commencement of the
first new offering period that commences following the effective time. Further,
until such time that the continuing LJL BioSystems employees are covered under
an employee benefit plan of Molecular Devices, they shall continue to be covered
under the corresponding LJL BioSystems plan that offers the same type of
benefit.

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REPRESENTATIONS AND WARRANTIES

     The merger agreement contains customary representations and warranties of
LJL BioSystems and Molecular Devices relating to, among other things, certain
aspects of the respective businesses and assets of the parties and other
matters. The representations and warranties expire at the effective time.

COVENANTS; CONDUCT OF BUSINESS PRIOR TO THE MERGER

     AFFIRMATIVE COVENANTS OF LJL BIOSYSTEMS. LJL BioSystems has agreed that
from the date of the merger agreement until the effective time it will:

     - ensure that LJL BioSystems and its subsidiary, LJL BioSystems, Ltd., a UK
       Corporation (LJL BioSystems and its subsidiary are referred to as the
       "acquired corporations" in the merger agreement) conduct its business and
       operations only in the ordinary course and in accordance with past
       practices, use commercially reasonable efforts to preserve intact the
       acquired corporations' current business organization, keep available the
       services of the acquired corporations' current officers and employees and
       maintain the acquired corporations' relations and goodwill with all
       suppliers, customers, landlords, creditors, licensors, licensees,
       employees and other persons having business relationships with it, and
       keep in full force or renew all insurance policies;

     - ensure that the acquired corporations substantially comply with all
       applicable laws and material requirements of material contracts;

     - provide Molecular Devices with reasonable access to the acquired
       corporations' representatives, personnel and assets and to all existing
       books, records, tax returns, work papers and other documents and provide
       copies of these materials, and additional financial, operating and other
       data and information regarding the acquired corporations as Molecular
       Devices may reasonably request;

     - deliver to Molecular Devices all material operating and financial reports
       prepared by LJL BioSystems and its subsidiary for LJL BioSystems senior
       management, any written materials or communication sent by LJL BioSystems
       to its stockholders, and any material or reports filed with any
       governmental body in connection with the merger or any related
       transaction contemplated by the merger agreement or received from any
       governmental body;

     - use commercially reasonable efforts to file all notices, reports and
       other documents required to be filed with any governmental body with
       respect to the merger, including the notifications required under the HSR
       Act and any applicable federal and state antitrust laws or regulations in
       connection with the merger; and


     - call and hold a special meeting of its common stockholders to vote upon
       the adoption and approval of the merger agreement and the merger.



     LJL BioSystems has also agreed that its board of directors will unanimously
recommend that the LJL BioSystems stockholders vote to approve the merger.
Notwithstanding the foregoing, however, at any time before the LJL BioSystems
special meeting of stockholders, the LJL BioSystems board of directors is
entitled to withdraw or modify its unanimous recommendation that the LJL
BioSystems stockholders vote to approve the merger if certain requirements,
including the following, are satisfied:


     - an unsolicited, bona fide written offer made by a third party to purchase
       more than 50% of the outstanding shares of LJL BioSystems common stock is
       made and is not withdrawn;

     - LJL BioSystems has not solicited, encouraged or otherwise induced the
       making of an offer to acquire LJL BioSystems;

     - LJL BioSystems satisfies requirements to provide notice of alternative
       offers to Molecular Devices;

     - the LJL BioSystems board of directors concludes in good faith, after
       consultation with its financial advisor and after consultation with its
       outside legal counsel, that, in light of a superior offer, it would be
       inconsistent with its fiduciary obligations to the LJL BioSystems
       stockholders not to

                                       69
<PAGE>   78

       withdraw, amend or modify its recommendation to vote in favor of the
       merger with Molecular Devices; and

     - the LJL BioSystems board of directors does not withdraw, amend or modify
       its unanimous recommendation in favor of the merger for at least 48 hours
       after the LJL BioSystems provides Molecular Devices with the name of the
       person making a superior offer and a copy of the superior offer.

     For purposes of the merger agreement, the term "superior offer" means an
unsolicited, bona fide written offer made by a third party to purchase more than
50% of the outstanding shares of LJL BioSystems common stock, which the LJL
BioSystems board of directors determines, in good faith, after consultation with
its financial advisor, to be more favorable to the LJL BioSystems stockholders
than the merger and the third party making the offer has, or is reasonably
capable of obtaining, adequate financing to consummate the transaction.

     If the LJL BioSystems board of directors withdraws or modifies its
recommendation that the LJL BioSystems stockholders vote to approve the
principal terms of the merger, LJL BioSystems may be required to pay a fee of
$9.0 million to Molecular Devices. See "-- Expenses and Termination Fees."

     NEGATIVE COVENANTS OF LJL BIOSYSTEMS. LJL BioSystems has agreed that before
the effective time, without the prior written consent of Molecular Devices, it
will not, will not agree to, and will not permit its subsidiary, LJL BioSystems,
Ltd. to:

     - declare, accrue, set aside or pay any or make any other distribution in
       respect of any shares of capital stock, or repurchase, redeem or
       otherwise reacquire any shares of capital stock or other securities
       except for repurchases under employment or consulting agreements;

     - subject to exceptions, sell, issue, grant or authorize any capital stock
       or any option or right to acquire any capital stock;

     - amend or waive any of its rights under, or accelerate the vesting under,
       any provision of any of LJL BioSystems' stock option plans or any
       agreement evidencing any outstanding stock option, warrant or other
       rights to acquire stock of LJL BioSystems;

     - amend or permit the adoption of any amendment to its certificate of
       incorporation or bylaws or to effect or join as a party to any major
       business combination of, recapitalization or similar transaction;

     - form any subsidiary or acquire any equity interest or other interest in
       any other entity;

     - make any capital expenditure exceeding $100,000 in the aggregate during
       the pre-closing period;

     - enter into, become bound by, amend or terminate any material contract
       (except that LJL BioSystems and its subsidiary may enter into or become
       bound by contracts made in the ordinary course of business consistent
       with past practices);

     - amend or terminate, or waive or exercise any material right or remedy
       under, any material contract, other than in the ordinary course of
       business consistent with past practices;

     - acquire, lease or license any right or other asset from any other person
       or sell or otherwise dispose of, or lease or license, any right or other
       asset to any other person or waive or relinquish any material right,
       except in the ordinary course of business and consistent with past
       practices;

     - subject to exceptions, lend money to any person or entity or incur or
       guarantee any indebtedness;

     - subject to exceptions, establish or amend any employee benefit plan, pay
       any bonus or make any profit-sharing payment to, or increase the amount
       of the wages, salary, commissions, fringe benefits or other compensation
       payable to, any of its directors, officers or employees;

     - hire any new employee at the level of vice president or above or with an
       annual base salary in excess of $100,000;
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     - change its pricing policies, product return policies, product maintenance
       polices, service policies, product modification or upgrade policies,
       personnel policies or other business policies, or any of its methods of
       accounting or accounting practices in any respect;

     - take or permit to be taken any action that could preclude Molecular
       Devices from accounting for the merger as a "pooling of interests" for
       accounting purposes;

     - make any tax election inconsistent with past practice;

     - subject to certain exceptions, initiate or settle any material legal
       proceeding involving payments by the acquired corporations in excess of
       $100,000 or equitable relief against the acquired corporations;

     - enter into any material transaction or take any other material action
       outside the ordinary course of business or inconsistent with past
       practices; or

     - agree to take any of the actions previously described.

     AFFIRMATIVE COVENANTS OF MOLECULAR DEVICES. Molecular Devices has agreed
that before the effective time, it will:

     - provide LJL BioSystems with reasonable access to Molecular Devices
       representatives, personnel and assets and to all its existing books,
       records, tax returns, work papers and other documents;

     - exercise commercially reasonable efforts to obtain regulatory approvals
       necessary to register under the securities law the shares of Molecular
       Devices common stock issuable in the merger;

     - use commercially reasonable efforts to file all notices, reports and
       other documents required to be filed with any governmental agency with
       respect to the merger, including the notifications required under the HSR
       Act and any applicable federal and states antitrust laws or regulations
       in connection with the merger;


     - call and hold a special meeting of its stockholders to vote on the
       issuance of shares of Molecular Devices common stock in the merger and to
       elect Lev J. Leytes to the board of directors of Molecular Devices, as
       may be required under its certificate of incorporation, bylaws and
       applicable law; and


     - conduct its business and operations only in the ordinary course and in
       accordance with past practices and in substantial compliance with all
       applicable legal requirements and the material requirements of all
       material contracts, use commercially reasonable efforts to preserve
       intact its current business organization, keep available the services of
       its current officers and employees and maintain its relations and
       goodwill with all suppliers, customers, landlords, creditors, licensors,
       licensees, employees and other persons having business relationships with
       it, and keep in full force or renew all insurance policies.

     NEGATIVE COVENANTS OF MOLECULAR DEVICES. Prior to the effective time,
Molecular Devices has agreed that neither Molecular Devices nor any of its
subsidiaries will directly or indirectly do, or propose to do, any of the
following without the prior written consent of LJL BioSystems:

     - amend or otherwise change its certificate of incorporation or bylaws or
       equivalent organizational documents of Molecular Devices or its
       subsidiaries;

     - alter the corporate structure of Molecular Devices;

     - amend the terms of, repurchase, redeem or otherwise acquire, or permit
       any of Molecular Devices' subsidiaries to repurchase, redeem or otherwise
       acquire, any of Molecular Devices' securities or any securities of its
       subsidiaries, or propose to do any of the actions just described;

     - acquire or agree to acquire any business (or a division thereof), or
       otherwise acquire or agree to acquire any assets which are material,
       individually or in the aggregate, to the business of Molecular Devices or
       enter into any joint ventures, strategic partnerships or alliances where
       such acquisition or

                                       71
<PAGE>   80

       agreement is reasonably likely to materially delay consummation of the
       merger or materially adversely affect Molecular Devices' ability to
       consummate the merger;

     - adopt a plan of complete or partial liquidation or dissolution of
       Molecular Devices;

     - fail to make, in a timely manner, any material filings with the
       Securities and Exchange Commission required under the Securities Act or
       the Exchange Act; or

     - agree to take any of the actions previously described.

     Molecular Devices has also agreed that its board of directors will
unanimously recommend that the Molecular Devices stockholders vote to approve
the issuance of shares of Molecular Devices common stock in the merger and the
election of Lev. J. Leytes to Molecular Devices board of directors. The merger
agreement prohibits the Molecular Devices board of directors from withdrawing or
modifying its unanimous recommendation. If the Molecular Devices board of
directors breaches the merger agreement and withdraws or modifies its
recommendation that the Molecular Devices stockholders vote to approve the
issuance of shares of Molecular Devices common stock in the merger, Molecular
Devices may be liable for significant damages, including the payment of a $5.0
million fee to LJL BioSystems. See "-- Expenses and Termination Fees."

LIMITATION ON CONSIDERING OTHER ACQUISITION PROPOSALS

     For the purposes of the merger agreement, the term "acquisition proposal"
means any offer, proposal or inquiry (other than by Molecular Devices) relating
to:

     - any business combination, issuance or acquisition of securities, tender
       offer, exchange offer or other similar transaction in which (1) any of
       the acquired corporations is a constituent company, (2) in which a person
       or "group" (as defined in the Exchange Act) of persons acquires LJL
       BioSystems or more than 40% of LJL BioSystems' business or more than 40%
       of the outstanding securities of any class of voting securities of any of
       the acquired corporations, or (3) in which any of the acquired
       corporations issues securities representing more than 40% of the
       outstanding securities of any class of voting securities of LJL
       BioSystems;

     - any sale, lease, exchange, transfer, license, acquisition or disposition
       of more than 40% of the assets of LJL BioSystems; or

     - any liquidation or dissolution of LJL BioSystems.

     LJL BioSystems has agreed that it will not and that it will not authorize
or permit its subsidiary, LJL BioSystems, Ltd. or any representative of LJL
BioSystems, Ltd. to directly or indirectly:

     - solicit, initiate, encourage, induce the making, submission or
       announcement of any offer, proposal, inquiry or take any action that
       could be expected to lead to an acquisition proposal by a third party;

     - furnish any information regarding LJL BioSystems or its subsidiary to any
       person in connection with or in response to an acquisition proposal;

     - engage in discussions or negotiations with any person with respect to any
       acquisition proposal;

     - approve, endorse or recommend any acquisition proposal; or

     - enter into any letter of intent or similar agreement contemplating or
       relating to any acquisition transaction.

     However, the foregoing restrictions will not prohibit LJL BioSystems from
furnishing information to, or entering into discussions with, any person if:

     - it does so in response to an unsolicited superior offer (defined above);

     - neither LJL BioSystems nor any representatives of the acquired
       corporations shall have violated its obligations not to solicit or
       encourage alternative acquisition proposals;

                                       72
<PAGE>   81

     - the LJL BioSystems board of directors, after consultation with its
       outside legal counsel, concludes in good faith that the failure to take
       such action would be inconsistent with its fiduciary obligations to the
       LJL BioSystems stockholders;

     - prior to furnishing any such nonpublic information to, or entering into
       discussions with, such person, LJL BioSystems gives Molecular Devices
       written notice of the identity of such person and of LJL BioSystems'
       intention to provide this information, and the information is furnished
       pursuant to an appropriate confidentiality agreement; and

     - prior to furnishing any nonpublic information to such person, LJL
       BioSystems furnishes the nonpublic information to Molecular Devices, but
       only to the extent such nonpublic information has not been previously
       furnished to Molecular Devices.

     If the LJL BioSystems board of directors receives an acquisition proposal,
then LJL BioSystems must promptly advise Molecular Devices orally and in writing
of the terms of the proposal and the identity of the person making it. LJL
BioSystems must keep Molecular Devices fully informed of the status of any
acquisition proposal and any modification or proposed modification thereto.

CONDITIONS TO THE MERGER

     CONDITIONS TO THE OBLIGATIONS OF EACH PARTY. The obligations of Molecular
Devices and LJL BioSystems to complete the merger are subject to the
satisfaction of the following conditions:

     - The Form S-4 registration statement shall have become effective in
       accordance with the provisions of the Securities Act and shall not be
       subject to any stop order;

     - the LJL BioSystems stockholders shall have approved the merger and the
       Molecular Devices stockholders shall have approved the issuance of shares
       of Molecular Devices common stock in the merger;

     - all applicable waiting periods under the HSR Act shall have expired or
       been terminated and all material foreign antitrust approval required to
       be obtained shall have been obtained;

     - the shares of Molecular Devices common stock to be issued in the merger
       shall have been approved for listing (subject to notice of issuance) on
       the Nasdaq National Market;

     - no court order or injunction shall be in effect that prohibits the
       consummation of the merger;

     - there shall not be pending or overtly threatened any action or legal
       proceeding involving any governmental body that challenges or prohibits
       the consummation of the merger; and

     - there shall not be pending any action or legal proceeding in which there
       is a reasonable likelihood of an outcome that would have a material
       adverse effect on LJL BioSystems or Molecular Devices challenging or
       seeking to restrain or prohibit the consummation of the merger.

     CONDITIONS TO THE OBLIGATION OF MOLECULAR DEVICES. The obligation of
Molecular Devices to complete the merger is subject to the satisfaction of the
following additional conditions:

     - the representations and warranties made by LJL BioSystems in the merger
       agreement shall be accurate in all material respects as of the date of
       the merger agreement, and accurate in all respects as of the closing date
       as if made on the closing date, except for any inaccuracies that do not
       constitute a material adverse effect on LJL BioSystems or changes
       contemplated by the merger agreement;

     - LJL BioSystems shall have complied in all material respects with all
       covenants and obligations required to be complied with by it under the
       merger agreement at or prior to the closing date;

     - the holders of not more than 5% of the shares of LJL BioSystems common
       stock shall have exercised dissenters' rights pursuant to Chapter 13 of
       the California Corporations Code;

                                       73
<PAGE>   82

     - LJL BioSystems shall have obtained all material consents required to be
       obtained in connection with the merger, except where the failure to do so
       would not reasonably have a material adverse effect on LJL BioSystems;


     - Molecular Devices shall have received (1) agreements from each person
       considered to be an "affiliate" of LJL BioSystems; (2) noncompetition
       agreement and release agreement executed by Lev J. Leytes; (3) a letter
       from PricewaterhouseCoopers LLP, dated as of the closing date, with
       respect to the availability of "pooling of interests" accounting
       treatment with respect to LJL BioSystems for the merger; (4) a letter
       from Ernst & Young LLP, dated as of the closing date, regarding the
       appropriateness of "pooling of interests" accounting for the merger under
       Accounting Principles Board Opinion No. 16 if the merger is closed and
       consummated in accordance with the merger agreement; (5) a tax opinion
       that the merger will constitute a reorganization for federal income tax
       purposes; (6) the written resignations of all officers and members of the
       board of directors of LJL BioSystems effective as of effective time; (7)
       a "comfort" letter from PricewaterhouseCoopers dated as of the closing
       date relating to the Form S-4 registration statement registering the
       shares of Molecular Devices common stock issuable in the merger; and (8)
       a certificate executed by Lev. J. Leytes on behalf of LJL BioSystems that
       certain conditions set forth in the merger agreement have been satisfied;
       and



     - the Form S-4 registration statement shall have become effective in
       accordance with the provisions of the Securities Act, and no stop order
       shall have been issued by the SEC with respect to such Form S-4
       registration statement.



     As used in the merger agreement, "material adverse effect" means, with
respect to LJL BioSystems, any event, violation, inaccuracy, circumstance or
other matter which would have a material adverse effect on (1) the business,
condition, capitalization, assets, liabilities, operations or financial
performance of LJL BioSystems and its subsidiary taken as a whole, (2) the
ability of LJL BioSystems to consummate the merger or any of the other
transactions contemplated by the merger agreement or to perform any of its
obligations under the merger agreement, or (3) Molecular Devices' ability to
vote or exercise ownership rights with respect to the common stock of LJL
BioSystems. However, none of the following constitute a material adverse effect
on LJL BioSystems:


     - a change in the market price or trading volume of the LJL BioSystems
       common stock;

     - an event, violation, inaccuracy, circumstance or other matter that
       results from conditions affecting the U.S. economy or the world economy;

     - an event, violation, inaccuracy, circumstance or other matter that
       results from conditions affecting the biotechnology industry so long as
       such conditions do not affect LJL BioSystems in a disproportionate manner
       as compared with companies of a similar size;

     - a delay in customer orders arising primarily out of or resulting
       primarily from the announcement of the transactions contemplated by the
       merger agreement;

     - an event, violation, inaccuracy, circumstance or other matter that
       results from the taking of any action required by the merger agreement;
       and

     - any failure by LJL BioSystems to meet internal projections or forecasts
       or published revenue or earnings predictions for any period ending (or
       for which revenues or earnings are released) on or after the date of the
       merger agreement (provided that LJL BioSystems complies with the conduct
       of business requirements set forth in the merger agreement).

     CONDITIONS TO THE OBLIGATION OF LJL BIOSYSTEMS. The obligation of LJL
BioSystems to complete the merger is subject to the satisfaction of the
following additional conditions:

     - the representations and warranties made by Molecular Devices in the
       merger agreement shall have been accurate in all material aspects as of
       the date of the merger agreement and shall be accurate in all respects as
       of the closing date as if made on the closing date, except for any
       inaccuracies in

                                       74
<PAGE>   83

       the representations and warranties that do not constitute a material
       adverse effect on Molecular Devices;

     - Molecular Devices shall have complied in all material respects with all
       covenants and obligations required to be complied with by it under the
       merger agreement at or prior to the closing date;

     - LJL BioSystems shall have received a tax opinion that the merger will
       constitute a reorganization for federal income tax purposes; and


     - Lev J. Leytes shall have been duly elected as a member of the board of
       directors of Molecular Devices.


     As used in the merger agreement, "material adverse effect" means, with
respect to Molecular Devices, any event, violation, inaccuracy, circumstance or
other matter which would have a material adverse effect on (1) the business,
condition, capitalization, assets, liabilities, operations or financial
performance of Molecular Devices; (2) the ability of Molecular Devices to
consummate the merger or perform any of its obligations under the merger
agreement. However, none of the following will be deemed to have a material
adverse effect on Molecular Devices:

     - a change in the market price or trading volume of Molecular Devices
       common stock;

     - an event, violation, inaccuracy, circumstance or other matter that
       results from conditions affecting the U.S. economy or the world economy;

     - an event, violation, inaccuracy, circumstance or other matter that
       results from conditions affecting the biotechnology industry so long as
       such conditions do not affect Molecular Devices in a disproportionate
       manner as compared with companies of a similar size;

     - a delay in customer orders arising primarily out of or resulting
       primarily from the announcement of the transactions contemplated by the
       merger agreement;

     - an event, violation, inaccuracy, circumstance or other matter that
       results from the taking of any action required by the merger agreement;
       and

     - any failure by Molecular Devices to meet internal projections or
       forecasts or published revenue or earnings predictions for any period
       ending (or for which revenues or earnings are released) on or after the
       date of the merger agreement, provided, that Molecular Devices has
       complied with conduct of business requirements of the merger agreement.

TERMINATION OF THE MERGER AGREEMENT

     Molecular Devices and LJL BioSystems can by mutual written consent
terminate the merger agreement at any time before the merger is completed,
whether before or after approval of the merger by LJL BioSystems stockholders
vote. In addition, either company can terminate the merger agreement if:

     - the merger is not completed on or before December 31, 2000, unless the
       failure to consummate the merger is attributable to a failure on the part
       of the party seeking to terminate this agreement to perform any material
       obligation required to be performed by such party at or prior to the
       effective time; provided, however, if at December 31, 2000 there is a
       reasonable likelihood that all of the condition precedents to both
       parties would be satisfied with additional time, then LJL BioSystems
       shall have the right to extend the termination date to no later than
       February 28, 2001;

     - a court or government body issues a final order prohibiting the merger or
       having the effect of permanently restraining or otherwise prohibiting the
       merger;

     - the LJL BioSystems stockholders do not approve the merger; provided,
       however, that if LJL BioSystems terminates the merger agreement for this
       reason it shall pay Molecular Devices a termination fee;

                                       75
<PAGE>   84

     - the Molecular Devices stockholders do not approve the issuance of shares
       of Molecular Devices common stock in the merger; provided, however, that
       if Molecular Devices terminates the merger agreement for this reason it
       shall pay LJL BioSystems a termination fee; or

     - the representations and warranties of the non-terminating company were
       materially inaccurate as of the date of the merger agreement or become
       materially inaccurate on or before the date of the merger.

     In addition, Molecular Devices may terminate the merger agreement if, prior
to the approval of the merger by LJL BioSystems stockholders:

     - the board of directors of LJL BioSystems shall have failed to recommend,
       or shall for any reason have withdrawn or shall have amended or modified
       in a manner adverse to Molecular Devices its unanimous recommendation in
       favor of, the adoption and approval of the merger agreement or the
       approval of the merger;


     - LJL BioSystems shall have failed to include in the joint proxy
       statement/prospectus the recommendation of the board of directors of LJL
       BioSystems in favor of the adoption and approval of the merger agreement
       and the approval of the merger;


     - the board of directors of LJL BioSystems fails to reaffirm its
       recommendation in favor of the adoption and approval of the merger
       agreement and the approval of the merger within ten business days after
       an acquisition proposal by a third party shall have been publicly
       announced and Molecular Devices requests in writing that such
       recommendation be reaffirmed;

     - the board of directors of LJL BioSystems shall have approved, endorsed or
       recommended an acquisition proposal by a third party;

     - LJL BioSystems shall have entered into any letter of intent or similar
       securities or any contract relating to any acquisition proposal by a
       third party;

     - a tender or exchange offer relating to securities of LJL BioSystems shall
       have been commenced and LJL BioSystems shall not have sent to its
       securityholders, within ten business days after the commencement of such
       tender or exchange offer, a statement disclosing that LJL BioSystems
       recommends rejection of such tender or exchange offer;

     - an acquisition proposal by a third party is publicly announced, and LJL
       BioSystems (A) fails to issue a press release announcing its opposition
       to such acquisition proposal within ten business days after the
       acquisition proposal is announced or (B) otherwise fails to oppose the
       acquisition proposal within ten business days after the acquisition
       proposal is announced; or

     - LJL BioSystems intentionally breaches any of its obligations under the no
       solicitation provision of the merger agreement.

     In addition, LJL BioSystems may terminate the merger agreement if, whether
before or after approval of the merger by LJL BioSystems stockholder vote, the
board of directors of LJL BioSystems shall have approved, endorsed or
recommended, in accordance with the merger agreement, a superior offer;
provided, however, that LJL BioSystems shall be required to pay a termination
fee of up to $9.0 million to Molecular Devices.

     Subject to limited exceptions, including the parties' agreement to pay a
termination fee under certain circumstances, if the merger agreement is
terminated, it is void. There will be no liability on the part of Molecular
Devices, Mercury Acquisition or LJL BioSystems (or their respective affiliates)
to the other, and all rights and obligations of the parties will cease. However,
no party will be relieved from its obligations with respect to any willful
breach of the merger agreement.

                                       76
<PAGE>   85

EXPENSES AND TERMINATION FEES


     All expenses incurred in connection with the merger will be paid by the
party incurring them, whether or not the merger is consummated; however, LJL
BioSystems and Molecular Devices will share equally the fees, other than
attorneys' and accounting fees, incurred with filing the Form S-4 registration
statement and the joint proxy statement/prospectus and any report forms relating
to the merger under the HSR Act, as amended. Notwithstanding the foregoing, the
merger agreement requires that in certain instances, a party will be required to
pay termination fees to the other party. In particular:


     - LJL BioSystems will be required to pay a nonrefundable termination fee to
       Molecular Devices in the amount of $9.0 million if:

      - the merger agreement is terminated by Molecular Devices or LJL
        BioSystems because the merger agreement and the merger were not approved
        by LJL BioSystems stockholders and at or prior to the time of such
        termination, an acquisition proposal by a third party has been
        disclosed, announced, commenced, submitted or made (and has not been
        publicly, absolutely and unconditionally withdrawn and abandoned); or

      - the merger agreement is terminated by Molecular Devices pursuant to the
        following "triggering events":

        - the board of directors of LJL BioSystems has failed to recommend, or
          for any reason has withdrawn or amended or modified, in a manner
          adverse to Molecular Devices, its unanimous recommendation in favor of
          the adoption and approval of the merger agreement or the approval of
          the merger;


        - LJL BioSystems has failed to include in the joint proxy
          statement/prospectus the recommendation of the board of directors of
          LJL BioSystems in favor of the adoption and approval of the merger
          agreement and the approval of the merger;


        - the board of directors of LJL BioSystems has failed to reaffirm its
          recommendation in favor of the adoption and approval of the merger
          agreement and the approval of the merger within ten business days
          after an acquisition proposal by a third party has been publicly
          announced and Molecular Devices requests in writing that such
          recommendation be reaffirmed;

        - the board of directors of the LJL BioSystems has approved, endorsed or
          recommended any acquisition proposal by a third party;

        - LJL BioSystems has entered into any letter of intent or similar
          document or any contract relating to any acquisition proposal by a
          third party;

        - a tender or exchange offer relating to securities of LJL BioSystems
          has been commenced and LJL BioSystems has not sent to its
          securityholders, within ten business days after the commencement of
          such tender or exchange offer, a statement disclosing that LJL
          BioSystems recommends rejection of such tender or exchange offer;

        - an acquisition proposal by a third party is publicly announced, and
          LJL BioSystems (A) fails to issue a press release announcing its
          opposition to such acquisition proposal within ten business days after
          such acquisition proposal is announced or (B) otherwise fails to
          oppose such acquisition proposal within ten business days after such
          acquisition proposal is announced;

        - LJL BioSystems intentionally breaches any of its obligations under the
          no solicitation provision of the merger agreement; or

        - the merger agreement and merger is terminated by LJL BioSystems
          because the board of directors of LJL BioSystems has approved,
          endorsed, or recommended a superior offer from a third party.

     - LJL BioSystems will be required to pay Molecular Devices a nonrefundable
       termination fee in the amount of $5.0 million dollars if the merger
       agreement and the merger is terminated by Molecular
                                       77
<PAGE>   86

       Devices or LJL BioSystems because the merger agreement and the merger has
       not been approved by LJL BioSystems stockholders (but no acquisition
       proposal by a third party has been disclosed, announced, commenced,
       submitted or made) and no event has occurred since March 31, 2000 that
       has had, or would reasonably be expected to have, a "material adverse
       effect" on Molecular Devices, as that phrase is defined above.

     - Molecular Devices will be required to pay LJL BioSystems a nonrefundable
       termination fee in the amount of $5.0 million if:


      - the merger agreement and the merger is terminated by Molecular Devices
        or LJL BioSystems because the Molecular Devices stockholders fail to
        approve the issuance of shares of Molecular Devices common stock in the
        merger and no event has occurred since March 31, 2000 that has had, or
        would reasonably be expected to have, a "material adverse effect" (as
        that phrase is defined above) on LJL BioSystems and its subsidiary, LJL
        BioSystems, Ltd., a UK corporation; or


      - the merger agreement and the merger is terminated by Molecular Devices
        or LJL BioSystems because the merger has not been consummated by
        December 31, 2000 (subject to the exceptions listed under the first
        bullet point under "Termination of the Merger Agreement" above) and:

        - at the time of such termination, the condition to the consummation of
          the merger which requires a letter from Ernst & Young LLP to the
          effect that Ernst & Young LLP concurs with Molecular Devices'
          management's conclusion that the merger may be accounted for as a
          "pooling of interests" has not been received by Molecular Devices and
          Molecular Devices has not waived compliance with this condition;

        - subject to exceptions, all other conditions to the consummation of the
          merger, as defined in the merger agreement, have been satisfied; and

        - the failure of Ernst & Young LLP to deliver to Molecular Devices the
          "pooling of interests" letter is not directly or indirectly related to
          any action taken, or failed to be taken, by LJL BioSystems or any of
          its affiliates.

                                       78
<PAGE>   87

                               VOTING AGREEMENTS

     The following description of the voting agreements describes the material
terms of the voting agreements. Forms of voting agreements are attached as Annex
B and C to this joint proxy statement/ prospectus and are incorporated herein by
reference. We encourage you to read the entire forms of voting agreements.


VOTING AGREEMENTS RELATING TO MOLECULAR DEVICES SHARES



     Joseph D. Keegan, Ph.D (also an executive officer), Moshe H. Alafi, David
L. Anderson, A. Blaine Bowman, Paul Goddard, Ph.D, Andre F. Marion, Harden M.
McConnell, Ph.D, and J. Allan Waitz, Ph.D, each a director of Molecular Devices,
Timothy A. Harkness, Gillian M.K. Humphries, Ph.D, Tony M. Lima, Robert J.
Murray, Andrew T. Zander and John S. Senaldi, each an executive officer of
Molecular Devices, Alafi Capital Company, Harden M. McConnell and Sophia G.
McConnell Trust under Agreement Dated March 29, 1992, the Anderson Living Trust
UAD 1/22/98, Anvest, L.P. and Dionex Corporation have each entered into voting
agreements with LJL BioSystems dated June 7, 2000. They have agreed in the
voting agreements to vote all shares of Molecular Devices common stock owned by
them as of the record date in favor of the issuance of shares of Molecular
Devices common stock in the merger and in favor of the election of Lev J. Leytes
to the board of directors of Molecular Devices. Pursuant to the voting
agreements, the Molecular Devices stockholders mentioned in this paragraph have
also granted LJL BioSystems an irrevocable proxy to vote their shares of
Molecular Devices common stock in favor of the issuance of shares of Molecular
Devices common stock in the merger and in favor of the election of Lev J. Leytes
to the board of directors of Molecular Devices. Approximately 1,380,220 shares,
or 12% of the shares of Molecular Devices common stock outstanding on the record
date, are subject to voting agreements and irrevocable proxies. The Molecular
Devices stockholders mentioned in this paragraph have also agreed prior to the
termination of the voting agreements, not to transfer, assign, convey or dispose
of any of the shares of Molecular Devices common stock, or any options warrant
or other right to purchase shares of Molecular Devices common stock, owned by
them unless each person to whom any such shares or options is transferred
executes a voting agreement and an irrevocable proxy (with any modifications
that LJL BioSystems reasonably requests) and agrees to hold such shares or
options subject to all of the terms and provisions of the voting agreement.


VOTING AGREEMENTS RELATING TO LJL BIOSYSTEMS SHARES


     Lev J. Leytes (also an executive officer), Galina Leytes (also an executive
officer), George W. Dunbar, Daniel S. Janney, Michael F. Bigham, John G. Freund,
and John D. Diekman, each a director of LJL BioSystems, and Larry Tannenbaum,
Richard M. Eglen, Ph.D, James S. Richey, Anthony H. Bautista, Douglas N. Modlin,
Ph.D, and Robert T. Beggs, each an executive officer of LJL BioSystems, and
Yalta Investments, L.P., the Leytes Revocable Trust UADTD 8/13/99, Mary E.
Leytes Irrevocable Trust UADTD 6/21/96, Dina L. Leytes Irrevocable Trust UADTD
6/21/96, Doug Modlin, Custodian for Anna Lark Modlin U/CA/UTMA, Doug Modlin,
Custodian for Sara Elayne Modlin U/CA/UTMA, Freund-Sexton 1997 Irrevocable
Childrens Trust UADTD 1/20/97 and the Freund/Sexton Living Trust dated 2/8/91
have each entered into voting agreements with Molecular Devices dated June 7,
2000. They have agreed in the voting agreements to vote all shares of LJL
BioSystems common stock owned by them as of the record date in favor of the
approval and adoption of the merger agreement and approval of the merger.
Pursuant to the voting agreements, they have granted Molecular Devices an
irrevocable proxy to vote their shares of LJL BioSystems common stock in favor
of the principal terms of the merger. Approximately 3,771,387 shares, or 25.4%
of the LJL BioSystems common stock outstanding on the record date, are subject
to voting agreements and irrevocable proxies. They have also agreed prior to the
termination of the voting agreements, not to transfer, assign, convey or dispose
of any shares of LJL BioSystems common stock, or any option, warrant or other
right to purchase shares of LJL BioSystems common stock, owned by them unless
each person to whom any such shares or option is transferred executes a voting
agreement and an irrevocable proxy (with any modifications that Molecular
Devices reasonably requests) and agrees to hold such shares or options subject
to all of the terms and provisions of the voting agreement.

                                       79
<PAGE>   88

                        MANAGEMENT AND OTHER INFORMATION


     After the merger, LJL BioSystems will be a wholly-owned subsidiary of
Molecular Devices, and LJL BioSystems' subsidiary, LJL BioSystems, Ltd., a UK
corporation, will be an indirect wholly-owned subsidiary of Molecular Devices.
After the merger, the Molecular Devices board of directors will consist of nine
persons. The merger agreement provides that the Molecular Devices board of
directors must use commercially reasonable efforts to attempt to cause, as of
the effective time, the election of Lev J. Leytes to the board of directors of
Molecular Devices. In order to accomplish the election of Lev J. Leytes to the
board of directors of Molecular Devices, the board of directors will, by
resolution, increase the size of the Molecular Devices board of directors to
nine directors. Immediately thereafter, the board of directors will fill the
vacancy created by the additional board seat by appointing Lev J. Leytes to the
board of directors. Certain information relating to the management, executive
compensation, certain relationships and related transactions and other related
matters pertaining to Molecular Devices and LJL BioSystems is set forth in or
incorporated by reference in their respective annual reports on Form 10-K which
are incorporated in this joint proxy statement/prospectus. See "Where You Can
Find More Information."


                                       80
<PAGE>   89

                SECURITY OWNERSHIP BY CERTAIN BENEFICIAL OWNERS

BENEFICIAL OWNERSHIP OF MOLECULAR DEVICES SHARES

     The following table and the notes thereto sets forth certain information
with respect to the beneficial ownership of shares of Molecular Devices common
stock, as of June 30, 2000 except as otherwise noted in the footnotes, for:

     - each stockholder who is known by Molecular Devices to own beneficially
       more than 5% of Molecular Devices common stock;

     - each director and executive officer; and

     - all directors and executive officers of Molecular Devices as a group.


<TABLE>
<CAPTION>
                                                               NUMBER OF      PERCENTAGE OF
                                                                 SHARES          SHARES
                                                              BENEFICIALLY    BENEFICIALLY
                  NAME OF BENEFICIAL OWNER                      OWNED(1)        OWNED(1)
                  ------------------------                    ------------    -------------
<S>                                                           <C>             <C>
Kopp Investment Advisors, Inc.(2)...........................   1,878,405          16.33%
  7701 France Ave. South, Ste. 500
  Edina, Minnesota 55435
Chase Manhattan Corporation(2)..............................     985,075           8.56
  270 Park Avenue, 35th Floor
  New York, New York 10017-2070
Putnam Investments(2).......................................     648,000           5.63
  One Post Office Square
  Boston, Massachusetts 02109
Pilgrim Baxter & Associates, Ltd.(2)........................     590,900           5.14
  825 Duportail Road
  Wayne, Pennsylvania 19087
Moshe H. Alafi(3)...........................................     424,840           3.69
Harden M. McConnell, Ph.D.(4)...............................     356,600           3.10
David L. Anderson(5)........................................     188,907           1.64
Joseph D. Keegan, Ph.D.(6)..................................     112,159           *
A. Blaine Bowman(7).........................................      62,000           *
Robert J. Murray(8).........................................      53,113           *
Gillian M.K. Humphries, Ph.D.(9)............................      45,777           *
Timothy A. Harkness(10).....................................      32,084           *
Tony M. Lima(11)............................................      24,380           *
Paul Goddard, Ph.D.(12).....................................      22,000           *
J. Allan Waitz, Ph.D.(13)...................................      22,000           *
John S. Senaldi(14).........................................      21,938           *
Andre F. Marion(15).........................................      16,500           *
Andrew T. Zander............................................         -0-           *
All directors and executive officers as a group (13
  persons)(16)..............................................   1,382,298          12.02
</TABLE>


-------------------------
  *  Less than one percent.


 (1) Beneficial ownership is determined in accordance with the rules of the SEC
     and generally includes voting or investment power with respect to
     securities. Shares of common stock subject to options currently exercisable
     or exercisable within 60 days of June 30, 2000 are deemed outstanding for
     computing the percentage of the person holding such options but are not
     deemed outstanding for computing the percentage of any other person.
     Percentage of beneficial ownership is based on 11,501,673 shares of common
     stock outstanding as of June 30, 2000.


                                       81
<PAGE>   90

 (2) Based on information as of December 31, 1999 reflected in Schedules 13D,
     13F and 13G filed with the SEC.


 (3) Includes 402,840 shares beneficially owned by Alafi Capital Company, of
     which Mr. Alafi, a director of the Company, is a general partner, and
     22,000 shares that may be acquired within 60 days after June 30, 2000
     pursuant to outstanding stock options.



 (4) Consists of 351,100 shares held by the Harden M. McConnell and Sophia G.
     McConnell Trust, of which Dr. McConnell is a co-trustee, and 5,500 shares
     that may be acquired within 60 days after June 30, 2000 pursuant to
     outstanding stock options.



 (5) Includes 14,710 shares beneficially owned by Anvest, L.P., of which Mr.
     Anderson is a general partner, and 22,000 shares that may be acquired
     within 60 days after June 30, 2000 pursuant to outstanding stock options.



 (6) Includes 89,000 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



 (7) Includes 22,000 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



 (8) Includes 52,499 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



 (9) Includes 45,583 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



(10) Includes 22,750 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options and periodic stock grants.



(11) Includes 23,200 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



(12) Includes 22,000 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



(13) Includes 22,000 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



(14) Includes 19,212 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options and periodic stock grants.



(15) Includes 16,500 shares that may be acquired within 60 days after June 30,
     2000 pursuant to outstanding stock options.



(16) Includes 768,650 shares held by entities affiliated with certain directors
     and 384,244 shares that certain directors and officers have the right to
     acquire within 60 days after June 30, 2000 pursuant to the exercise of
     outstanding stock options and/or periodic stock grant rights. See footnotes
     (3) through (15).


                                       82
<PAGE>   91

BENEFICIAL OWNERSHIP OF LJL BIOSYSTEMS SHARES


     The following table and the notes thereto sets forth certain information
with respect to the beneficial ownership of shares of LJL BioSystems common
stock, as of June 30, 2000 except as otherwise noted in the footnotes, for:


     - each stockholder who is known by LJL BioSystems to own beneficially more
       than 5% of LJL BioSystems common stock;

     - each director and executive officer; and

     - all directors and executive officers of LJL BioSystems as a group.


<TABLE>
<CAPTION>
                                                               NUMBER OF SHARES OF      PERCENTAGE OF
                                                                  LJL BIOSYSTEMS            TOTAL
                                                                   COMMON STOCK          OUTSTANDING
       OFFICERS, DIRECTORS AND PRINCIPAL STOCKHOLDERS         BENEFICIALLY OWNED(1)       SHARES(2)
       ----------------------------------------------         ----------------------    -------------
<S>                                                           <C>                       <C>
T. Rowe Price Associates, Inc.(3)...........................        1,265,745                     8.4%
  100 East Pratt Street
  Baltimore, Maryland 21202
Entities affiliated with Hambrecht & Quist Capital
  Management, Inc.(4).......................................          969,232                     6.4
  50 Rowes Wharf
  Boston, MA 02110
Entities affiliated with INVESCO Private Capital(5).........          852,500                     5.7
  116 Avenue of the Americas
  New York, New York 10036
Lev J. Leytes(6)............................................        3,644,746                    24.2
Galina Leytes(7)............................................        3,624,453                    24.1
James S. Richey(8)..........................................           46,407                     0.3
Larry Tannenbaum(9).........................................           51,534                     0.3
Douglas N. Modlin, Ph.D(10).................................           43,140                     0.3
Michael F. Bigham(11).......................................           20,125                     0.1
  750 Forest Avenue
  Palo Alto, CA 94301
George W. Dunbar, Jr. ......................................            5,000                       *
  Metra BioSystems, Inc.
  265 North Whisman Road
  Mountain View, CA 94043
John G. Freund, M.D.(12)....................................           32,374                     0.2
  Skyline Venture Partners, L.P.
  525 University Avenue, Suite 701
  Palo Alto, CA 94301
Daniel S. Janney(13)........................................           20,000                     0.1
  Alta Partners
  One Embarcadero Center, Suite 4050
  San Francisco, CA 94111
All directors and executive officers as a group (12
  persons)(14)..............................................        3,916,378                    26.0
</TABLE>


-------------------------
  *  Less than 0.1%.


 (1) Except pursuant to applicable community property laws or as indicated in
     the footnotes to this table, to the Company's knowledge, each stockholder
     identified in the table possesses sole voting and investment power with
     respect to all shares of common stock shown as beneficially owned by such
     stockholder.


                                       83
<PAGE>   92


 (2) Applicable percentage of ownership for each stockholder is based on
     14,856,348 shares of Common Stock outstanding as of June 30, 2000, together
     with applicable options for such stockholders. Beneficial ownership is
     determined in accordance with the rules of the Securities and Exchange
     Commission (the "SEC"). The number of shares beneficially owned by a person
     includes shares of Common Stock subject to options held by that person that
     are currently exercisable or exercisable within 60 days of June 30, 2000.
     Such shares issuable pursuant to such options are deemed outstanding for
     computing the percentage ownership of the person holding such options but
     are not deemed outstanding for the purposes of computing the percentage
     ownership of each other person. Unless otherwise indicated, the address of
     each of the individuals named above is: c/o LJL BioSystems, Inc., 405
     Tasman Drive, Sunnyvale, CA 94089.


 (3) Based on information provided by T. Rowe Price Associates, Inc.


 (4) Based on information provided by Hambrecht & Quist Capital Management,
     Inc., the total number consists of 581,539 shares held by H&Q Healthcare
     Investors and 387,693 shares held by H&Q Life Sciences Investors.


 (5) This information is based on a Schedule 13G/A filed on April 7, 2000.
     INVESCO Private Capital refers herein to the following persons: AMVESCAP
     PLC, AVZ, Inc., AIM Management Group Inc., AMVESCAP Group Services, Inc.,
     INVESCO, Inc., INVESCO North American Holdings, Inc., INVESCO Capital
     Management, Inc., INVESCO Funds Group, Inc., INVESCO Management & Research,
     Inc., INVESCO Realty Advisors, Inc., INVESCO (NY) Asset Management, Inc.,
     all of which are organized under the laws of England and all of which share
     voting and dispositive power over all shares held by INVESCO Private
     Capital.


 (6) Consists of 1,146 shares jointly held by Lev J. Leytes and Galina Leytes,
     3,072,322 shares held by the Leytes Revocable Trust, UADTD 8/13/99, 450,000
     shares held by Yalta Investments, L.P., 37,064 shares held by the Dina L.
     Leytes Irrevocable Trust UADTD 6/21/96 and 37,064 shares held by the Mary
     E. Leytes Irrevocable Trust UADTD 6/21/96 and 47,150 shares issuable upon
     exercise of options exercisable within 60 days of June 30, 2000. Mr. Leytes
     disclaims beneficial ownership of the shares held in each trust except to
     the extent of his pecuniary interest therein.



 (7) Consists of 1,146 shares jointly held by Lev J. Leytes and Galina Leytes,
     3,072,322 shares held by the Leytes Revocable Trust, UADTD 8/13/99, 450,000
     shares held by Yalta Investments, L.P., 37,064 shares held by the Dina L.
     Leytes Irrevocable Trust UADTD 6/21/96 and 37,064 shares held by the Mary
     E. Leytes Irrevocable Trust UADTD 6/21/96 and 26,857 shares issuable upon
     exercise of options exercisable within 60 days of June 30, 2000. Ms. Leytes
     disclaims beneficial ownership of the shares held in each trust except to
     the extent of her pecuniary interest therein.



 (8) Consists of 46,407 shares issuable upon exercise of options exercisable
     within 60 days of June 30, 2000.



 (9) Includes 10,000 shares issuable upon exercise of options exercisable within
     60 days of June 30, 2000.



(10) Includes 625 shares held by Doug Modlin, Custodian for Anna Lark Modlin
     U/CA/UTMA, 625 shares held by Doug Modlin, Custodian for Sara Elayne Modlin
     U/CA/UTMA and 23,321 shares issuable upon exercise of options exercisable
     within 60 days of June 30, 2000. Mr. Modlin disclaims beneficial ownership
     of the shares held as custodian.



(11) Includes 5,000 shares of restricted stock held by Mr. Bigham, a director of
     the Company and 15,125 shares issuable upon exercise of options exercisable
     within 60 days of June 30, 2000.



(12) Includes 20,000 shares held by the Freund/Sexton Living Trust dated 2/8/91,
     of which 10,000 shares are restricted stock, and 5,209 shares held by the
     Freund-Sexton 1997 Irrevocable Childrens Trust UADTD 1/20/97.



(13) Includes 20,000 shares of restricted stock held by Mr. Janney, a director
     of the Company.



(14) Includes 192,141 shares subject to options exercisable within 60 days of
     June 30, 2000.


                                       84
<PAGE>   93

          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS


     On June 7, 2000, Molecular Devices entered into an agreement to merge with
LJL BioSystems in a transaction to be accounted for as a "pooling of interests."
Under the terms of the agreement, each issued and outstanding common share of
LJL BioSystems will be exchanged for 0.30 of a share of Molecular Devices common
stock. Additionally, Molecular Devices will assume outstanding options and
warrants to acquire LJL BioSystems common stock. As of March 31, 2000, there
were outstanding options and warrants to acquire approximately 2,036,000 shares
of LJL BioSystems common stock, which would become exercisable for approximately
611,000 shares of Molecular Devices common stock.



     The following unaudited pro forma condensed combined financial statements
present the effect of the proposed merger between Molecular Devices and LJL
BioSystems on a "pooling of interests" basis. The Molecular Devices and LJL
BioSystems unaudited pro forma combined balance sheet assumes that the merger of
Molecular Devices and LJL BioSystems took place on March 31, 2000 and combines
the Molecular Devices and LJL BioSystems historical consolidated balance sheets
at March 31, 2000. The Molecular Devices and LJL BioSystems unaudited pro forma
combined statements of income assume that the merger of Molecular Devices and
LJL BioSystems took place as of the beginning of the periods presented and
combine Molecular Devices' and LJL BioSystems' historical consolidated
statements of income data for the years ended December 31, 1999, 1998 and 1997
and for the three-month periods ended March 31, 2000 and March 31, 1999.


     The unaudited pro forma condensed combined financial statements are based
on the estimates and assumptions set forth in the notes to such statements,
which are preliminary and have been made solely for purposes of developing such
pro forma information. The unaudited pro forma condensed combined financial
statements are not necessarily an indication of the results that would have been
achieved had such transactions been consummated as of the dates indicated or
that may be achieved in the future.


     Molecular Devices and LJL BioSystems estimate that they will incur direct
transaction costs of approximately $17.5 million in connection with the proposed
merger of Molecular Devices with LJL BioSystems, which will be charged to
operations in the quarter in which the merger is consummated. This amount is a
preliminary estimate and is therefore subject to change. There can be no
assurance that Molecular Devices will not incur additional charges in subsequent
quarters to reflect costs associated with the proposed merger.


     These unaudited pro forma condensed combined financial statements should be
read in conjunction with the historical consolidated financial statements and
notes thereto to Molecular Devices and LJL BioSystems and other financial
information pertaining to Molecular Devices and LJL BioSystems including
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and "Risk Factors" incorporated by reference or included herein.

                                       85
<PAGE>   94

              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
                                 (IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                   MARCH 31, 2000
                                                 --------------------------------------------------
                                                       HISTORICAL
                                                 -----------------------           PRO FORMA
                                                 MOLECULAR       LJL        -----------------------
                                                  DEVICES     BIOSYSTEMS    ADJUSTMENTS    COMBINED
                                                 ---------    ----------    -----------    --------
<S>                                              <C>          <C>           <C>            <C>
ASSETS:
  Current assets:
     Cash and cash equivalents.................   $27,467      $ 11,480      $     --      $ 38,947
     Short-term investments....................        --        14,980            --        14,980
     Accounts receivable, net..................    18,688         1,337            --        20,025
     Inventories...............................     9,632         2,155            --        11,787
     Deferred tax assets.......................     2,465            --         8,607(a)     11,072
     Other current assets......................       816         1,034            --         1,850
                                                  -------      --------      --------      --------
       Total current assets....................    59,068        30,986         8,607        98,661
  Equipment and leasehold improvements, net....     4,527           975            --         5,502
  Other assets.................................     6,467           223            --         6,690
                                                  -------      --------      --------      --------
                                                  $70,062      $ 32,184      $  8,607      $110,853
                                                  =======      ========      ========      ========
LIABILITIES AND STOCKHOLDERS' EQUITY:
  Current liabilities:
     Accounts payable..........................   $ 4,231      $    815      $     --      $  5,046
     Accrued liabilities.......................     4,419         2,600        17,500(c)     24,519
     Deferred revenue..........................     1,338           773            --         2,111
     Current portion of long-term debt.........        --           290            --           290
                                                  -------      --------      --------      --------
       Total current liabilities...............     9,988         4,478        17,500        31,966
  Long-term debt, net of current portion.......        --           511            --           511
  Stockholders' equity
     Preferred stock...........................        --            --            --            --
     Common stock..............................        10            15           (10)(b)        15
     Additional paid-in capital................    45,454        50,256            10(b)     95,720
     Deferred compensation.....................       (46)         (391)           --          (437)
     Accumulated deficit.......................    15,344       (22,662)        8,607(a)
                                                                              (17,500)(c)   (16,211)
     Accumulated and other comprehensive
       income..................................      (688)          (23)           --          (711)
                                                  -------      --------      --------      --------
       Total stockholders' equity..............    60,074        27,195        (8,893)       78,376
                                                  -------      --------      --------      --------
                                                  $70,062      $ 32,184      $  8,607      $110,853
                                                  =======      ========      ========      ========
</TABLE>


-------------------------
(a) To reflect the combined tax position as if the merger had occurred at the
    beginning of the earliest period presented. This adjustment is based on the
    evaluation of a variety of factors including the combined companies'
    statutory and state tax rates, and the elimination of the valuation
    allowance for deferred tax assets of LJL BioSystems.

(b) To record the exchange of LJL BioSystems common stock for Molecular Devices
    common stock.


(c) To adjust the pro forma condensed combined balance sheet to reflect one-time
    merger-related charges which will be expensed at the time the merger is
    consummated as required under the pooling-of-interests accounting method.
    These charges are presently estimated to be approximately $17.5 million.
    Direct merger expenses include banking and financial advisory fees, other
    professional services, estimated registration expenses and various
    redeployment, retention and severance costs.


                                       86
<PAGE>   95

           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                         THREE MONTHS ENDED MARCH 31, 2000
                                                 --------------------------------------------------
                                                       HISTORICAL
                                                 -----------------------           PRO FORMA
                                                 MOLECULAR       LJL        -----------------------
                                                  DEVICES     BIOSYSTEMS    ADJUSTMENTS    COMBINED
                                                 ---------    ----------    -----------    --------
<S>                                              <C>          <C>           <C>            <C>
Revenues.......................................   $17,068      $ 3,111        $    --      $20,179
Cost of revenues...............................     6,250        1,111             --        7,361
                                                  -------      -------        -------      -------
Gross margin...................................    10,818        2,000             --       12,818
                                                  -------      -------        -------      -------
Operating expenses:
  Research and development.....................     1,888        2,099             --        3,987
  Selling, general and administrative..........     5,083        2,395             --        7,478
                                                  -------      -------        -------      -------
     Total operating expenses..................     6,971        4,494             --       11,465
                                                  -------      -------        -------      -------
Income (loss) from operations..................     3,847       (2,494)            --        1,353
Interest and other income, net.................       387          240             --          627
Interest expense...............................        --          (25)            --          (25)
                                                  -------      -------        -------      -------
Income (loss) before taxes.....................     4,234       (2,279)            --        1,955
Income tax provision...........................     1,630            4           (865)(a)      769
                                                  -------      -------        -------      -------
Net income (loss)..............................   $ 2,604      $(2,283)       $   865      $ 1,186
                                                  =======      =======        =======      =======
Basic net income (loss) per share..............   $  0.27      $ (0.16)                    $  0.09
                                                  =======      =======                     =======
Diluted net income (loss) per share............   $  0.25      $ (0.16)                    $  0.08
                                                  =======      =======                     =======
Shares used in computing basic net income
  (loss) per share.............................     9,706       14,000         (9,800)(b)   13,906
                                                  =======      =======        =======      =======
Shares used in computing diluted net income
  (loss) per share.............................    10,596       14,000         (9,391)(b)   15,205
                                                  =======      =======        =======      =======
</TABLE>

-------------------------
(a) To reflect the combined tax position as if the merger had occurred at the
    beginning of the earliest period presented. This adjustment is based on the
    evaluation of a variety of factors including the combined companies'
    statutory and state tax rates, and the elimination of the valuation
    allowance for deferred tax assets of LJL BioSystems.

(b) To record the exchange of LJL BioSystems common stock for Molecular Devices
    common stock (including the dilutive effect of LJL BioSystems' outstanding
    stock options and assumed conversion of LJL BioSystems mandatorily
    redeemable convertible preferred stock).

                                       87
<PAGE>   96

           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                         THREE MONTHS ENDED MARCH 31, 1999
                                                 --------------------------------------------------
                                                       HISTORICAL
                                                 -----------------------           PRO FORMA
                                                 MOLECULAR       LJL        -----------------------
                                                  DEVICES     BIOSYSTEMS    ADJUSTMENTS    COMBINED
                                                 ---------    ----------    -----------    --------
<S>                                              <C>          <C>           <C>            <C>
Revenues.......................................   $13,507      $ 1,359       $     --      $14,866
Cost of revenues...............................     5,264          698             --        5,962
                                                  -------      -------       --------      -------
Gross margin...................................     8,243          661             --        8,904
                                                  -------      -------       --------      -------
Operating expenses:
  Research and development.....................     1,590        1,483             --        3,073
  Selling, general and administrative..........     3,865        1,689             --        5,554
                                                  -------      -------       --------      -------
     Total operating expenses..................     5,455        3,172             --        8,627
                                                  -------      -------       --------      -------
Income (loss) from operations..................     2,788       (2,511)            --          277
Interest and other income, net.................       421          180             --          601
Interest expense...............................        --          (20)            --          (20)
                                                  -------      -------       --------      -------
Income (loss) before taxes.....................     3,209       (2,351)            --          858
Income tax provision...........................     1,235           --           (949)(a)      286
                                                  -------      -------       --------      -------
Net income (loss)..............................   $ 1,974      $(2,351)      $    949      $   572
                                                  =======      =======       ========      =======
Basic net income (loss) per share..............   $  0.21      $ (0.20)                    $  0.04
                                                  =======      =======                     =======
Diluted net income (loss) per share............   $  0.20      $ (0.20)                    $  0.04
                                                  =======      =======                     =======
Shares used in computing basic net income
  (loss) per share.............................     9,528       11,969         (8,378)(b)   13,119
                                                  =======      =======       ========      =======
Shares used in computing diluted net income
  (loss) per share.............................     9,963       11,969         (8,086)(b)   13,846
                                                  =======      =======       ========      =======
</TABLE>

-------------------------
(a) To reflect the combined tax position as if the merger had occurred at the
    beginning of the earliest period presented. This adjustment is based on the
    evaluation of a variety of factors including the combined companies'
    statutory and state tax rates, and the elimination of the valuation
    allowance for deferred tax assets of LJL BioSystems.

(b) To record the exchange of LJL BioSystems common stock for Molecular Devices
    common stock (including the dilutive effect of LJL BioSystems' outstanding
    stock options and assumed conversion of LJL BioSystems mandatorily
    redeemable convertible preferred stock).

                                       88
<PAGE>   97

           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31, 1999
                                                 --------------------------------------------------
                                                       HISTORICAL                  PRO FORMA
                                                 -----------------------    -----------------------
                                                 MOLECULAR       LJL
                                                  DEVICES     BIOSYSTEMS    ADJUSTMENTS    COMBINED
                                                 ---------    ----------    -----------    --------
<S>                                              <C>          <C>           <C>            <C>
Revenues.......................................   $61,985      $ 9,917        $    --      $71,902
Cost of revenues...............................    22,745        3,554             --       26,299
                                                  -------      -------        -------      -------
Gross margin...................................    39,240        6,363             --       45,603
                                                  -------      -------        -------      -------
Operating expenses:
  Research and development.....................     7,363        6,787             --       14,150
  Write-off of acquired research and
     development...............................     2,037           --             --        2,037
  Selling, general and administrative..........    17,431        8,199             --       25,630
                                                  -------      -------        -------      -------
     Total operating expenses..................    26,831       14,986             --       41,817
                                                  -------      -------        -------      -------
Income (loss) from operations..................    12,409       (8,623)            --        3,786
Interest and other income, net.................     1,421          590             --        2,011
Interest expense...............................        --          (90)            --          (90)
                                                  -------      -------        -------      -------
Income (loss) before taxes.....................    13,830       (8,123)            --        5,707
Income tax provision...........................     5,325           15         (3,284)(a)    2,056
                                                  -------      -------        -------      -------
Net income (loss)..............................   $ 8,505      $(8,138)       $ 3,284      $ 3,651
                                                  =======      =======        =======      =======
Basic net income (loss) per share..............   $  0.89      $ (0.65)                    $  0.27
                                                  =======      =======                     =======
Diluted net income (loss) per share............   $  0.84      $ (0.65)                    $  0.26
                                                  =======      =======                     =======
Shares used in computing basic net income
  (loss) per share.............................     9,595       12,506         (8,754)(b)   13,347
                                                  =======      =======        =======      =======
Shares used in computing diluted net income
  (loss) per share.............................    10,071       12,506         (8,428)(b)   14,149
                                                  =======      =======        =======      =======
</TABLE>

-------------------------
(a) To reflect the combined tax position as if the merger had occurred at the
    beginning of the earliest period presented. This adjustment is based on the
    evaluation of a variety of factors including the combined companies'
    statutory and state tax rates, and the elimination of the valuation
    allowance for deferred tax assets of LJL BioSystems.

(b) To record the exchange of LJL BioSystems common stock for Molecular Devices
    common stock (including the dilutive effect of LJL BioSystems' outstanding
    stock options and assumed conversion of LJL BioSystems mandatorily
    redeemable convertible preferred stock).

                                       89
<PAGE>   98

           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31, 1998
                                                 --------------------------------------------------
                                                       HISTORICAL                  PRO FORMA
                                                 -----------------------    -----------------------
                                                 MOLECULAR       LJL
                                                  DEVICES     BIOSYSTEMS    ADJUSTMENTS    COMBINED
                                                 ---------    ----------    -----------    --------
<S>                                              <C>          <C>           <C>            <C>
Revenues.......................................   $47,798      $ 4,436        $    --      $52,234
Cost of revenues...............................    17,716        2,487             --       20,203
                                                  -------      -------        -------      -------
Gross margin...................................    30,082        1,949             --       32,031
                                                  -------      -------        -------      -------
Operating expenses:
  Research and development.....................     5,686        5,472             --       11,158
  Write-off of acquired research and
     development...............................       876           --             --          876
  Selling, general and administrative..........    14,078        5,308             --       19,386
                                                  -------      -------        -------      -------
     Total operating expenses..................    20,640       10,780             --       31,420
                                                  -------      -------        -------      -------
Income (loss) from operations..................     9,442       (8,831)            --          611
Interest and other income, net.................     1,584          629             --        2,213
Interest expense...............................        --          (35)            --         (35)
                                                  -------      -------        -------      -------
Income (loss) before taxes.....................    11,026       (8,237)            --        2,789
Income tax provision...........................     4,245           --         (3,289)(a)      956
                                                  -------      -------        -------      -------
Net income (loss)..............................     6,781       (8,237)         3,289        1,833
Accretion of mandatorily redeemable convertible
  preferred stock redemption value.............        --         (254)           254(c)        --
                                                  -------      -------        -------      -------
Net income (loss) available to common
  stockholders.................................   $ 6,781      $(8,491)       $ 3,543      $ 1,833
                                                  =======      =======        =======      =======
Basic net income (loss) per share available to
  common stockholders..........................   $  0.72      $ (0.91)                    $  0.15
                                                  =======      =======                     =======
Diluted net income (loss) per share available
  to common stockholders.......................   $  0.70      $ (0.91)                    $  0.14
                                                  =======      =======                     =======
Shares used in computing basic net income
  (loss) per share available to common
  stockholders.................................     9,411        9,283         (6,287)(b)   12,407
                                                  =======      =======        =======      =======
Shares used in computing diluted net income
  (loss) per share available to common
  stockholders.................................     9,738        9,283         (6,056)(b)   12,965
                                                  =======      =======        =======      =======
</TABLE>

-------------------------
(a) To reflect the combined tax position as if the merger had occurred at the
    beginning of the earliest period presented. This adjustment is based on the
    evaluation of a variety of factors including the combined companies'
    statutory and state tax rates, and the elimination of the valuation
    allowance for deferred tax assets of LJL BioSystems.

(b) To record the exchange of LJL BioSystems common stock for Molecular Devices
    common stock (including the dilutive effect of LJL BioSystems' outstanding
    stock options and assumed conversion of LJL BioSystems mandatorily
    redeemable convertible preferred stock).

(c) To adjust the accretion of the mandatorily redeemable convertible preferred
    stock redemption value to zero to reflect the assumed conversion of the
    outstanding LJL BioSystems mandatorily redeemable convertible preferred
    stock to common stock.

                                       90
<PAGE>   99

             UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
                       (IN THOUSANDS, EXCEPT PER SHARE DATA)


<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31, 1997
                                                 --------------------------------------------------
                                                       HISTORICAL
                                                 -----------------------           PRO FORMA
                                                 MOLECULAR       LJL        -----------------------
                                                  DEVICES     BIOSYSTEMS    ADJUSTMENTS    COMBINED
                                                 ---------    ----------    -----------    --------
<S>                                              <C>          <C>           <C>            <C>
Revenues.......................................   $38,286      $ 5,204        $    --      $43,490
Cost of revenues...............................    14,426        2,319             --       16,745
                                                  -------      -------        -------      -------
Gross margin...................................    23,860        2,885             --       26,745
                                                  -------      -------        -------      -------
Operating expenses:
  Research and development.....................     4,721        3,511             --        8,232
  Selling, general and administrative..........    11,883        2,145             --       14,028
                                                  -------      -------        -------      -------
     Total operating expenses..................    16,604        5,656             --       22,260
                                                  -------      -------        -------      -------
Income (loss) from operations..................     7,256       (2,771)            --        4,485
Interest and other income, net.................     1,220          237             --        1,457
Interest expense...............................        --           (9)            --           (9)
                                                  -------      -------        -------      -------
Income (loss) before taxes.....................     8,476       (2,543)            --        5,933
Income tax provision...........................     3,174           12         (1,169)(a)    2,017
                                                  -------      -------        -------      -------
Net income (loss)..............................     5,302       (2,555)         1,169        3,916
Accretion of mandatorily redeemable convertible
  preferred stock redemption value.............        --         (636)           636(c)        --
                                                  -------      -------        -------      -------
Net income (loss) available to common
  stockholders.................................   $ 5,302      $(3,191)       $ 1,805      $ 3,916
                                                  =======      =======        =======      =======
Basic net income (loss) per share available to
  common stockholders..........................   $  0.58      $ (0.71)                    $  0.35
                                                  =======      =======                     =======
Diluted net income (loss) per share available
  to common stockholders.......................   $  0.55      $ (0.71)                    $  0.33
                                                  =======      =======                     =======
Shares used in computing basic net income
  (loss) per share available to common
  stockholders.................................     9,137        4,504         (2,534)(b)   11,107
                                                  =======      =======        =======      =======
Shares used in computing diluted net income
  (loss) per share available to common
  stockholders.................................     9,721        4,504         (2,319)(b)   11,906
                                                  =======      =======        =======      =======
</TABLE>


-------------------------
(a) To reflect the combined tax position as if the merger had occurred at the
    beginning of the earliest period presented. This adjustment is based on the
    evaluation of a variety of factors including the combined companies'
    statutory and state tax rates, and the elimination of the valuation
    allowance for deferred tax assets of LJL BioSystems.

(b) To record the exchange of LJL BioSystems common stock for Molecular Devices
    common stock (including the dilutive effect of LJL BioSystems' outstanding
    stock options and assumed conversion of LJL BioSystems mandatorily
    redeemable convertible preferred stock).

(c) To adjust the accretion of the mandatorily redeemable convertible preferred
    stock redemption value to zero to reflect the assumed conversion of the
    outstanding LJL BioSystems mandatorily redeemable convertible preferred
    stock to common stock.

                                       91
<PAGE>   100


                          NOTES TO UNAUDITED PRO FORMA


                    CONDENSED COMBINED FINANCIAL STATEMENTS


NOTE 1

     Both Molecular Devices' and LJL BioSystems' fiscal years end on December
31. The accompanying unaudited pro forma combined statements of income
information give effect to the proposed merger of Molecular Devices and LJL
BioSystems as if such merger occurred as of the beginning of the earliest period
presented on a pooling-of-interests basis. The pro forma combined statements of
income for the years ended December 31, 1999, 1998 and 1997 and the three-month
periods ended March 31, 2000 and March 31, 1999 reflect the results of
operations of both Molecular Devices and LJL BioSystems for the same years and
three-month periods then ended.

     The pro forma combined balance sheet as of March 31, 2000 combines the
assets, liabilities and stockholders' equity of Molecular Devices and LJL
BioSystems as of March 31, 2000.

NOTE 2

     Basic net income per share is computed using the weighted average number of
common shares outstanding during the period. Diluted net income per share is
computed using the weighted average number of common and dilutive common
equivalent shares outstanding during the period. Potential dilutive common
equivalent shares consist of stock options and warrants (using the treasury
stock method). Common equivalent shares are excluded from the computations if
their effect is anti-dilutive. Pro forma net income per share is computed by
adding Molecular Devices historical weighted average shares outstanding to LJL
BioSystems historical weighted average shares outstanding converted to give
effect to the exchange ratio of 0.30.

                                       92
<PAGE>   101

                          NOTES TO UNAUDITED PRO FORMA


              CONDENSED COMBINED FINANCIAL STATEMENTS (CONTINUED)


     The following table reconciles the number of shares used in the pro forma
earnings per share computations to the numbers set forth in Molecular Devices'
and LJL BioSystems' historical statements of operations (in thousands, except
the exchange ratio):

<TABLE>
<CAPTION>
                                              THREE MONTHS     THREE MONTHS
                                                 ENDED            ENDED
                                             MARCH 31, 2000   MARCH 31, 1999    1999     1998     1997
                                             --------------   --------------   ------   ------   ------
<S>                                          <C>              <C>              <C>      <C>      <C>
Shares used in basic per share computation:
  Historical LJL BioSystems................      14,000           11,969       12,506    9,283    4,504
  Assumed conversion of outstanding LJL
     BioSystems mandatorily redeemable
     convertible preferred stock...........          --               --           --      704    2,064
                                                 ------           ------       ------   ------   ------
                                                 14,000           11,969       12,506    9,987    6,568
  Exchange ratio...........................        0.30             0.30         0.30     0.30     0.30
                                                 ------           ------       ------   ------   ------
                                                  4,200            3,591        3,752    2,996    1,970
  Historical Molecular Devices.............       9,706            9,528        9,595    9,411    9,137
                                                 ------           ------       ------   ------   ------
  Pro forma combined.......................      13,906           13,119       13,347   12,407   11,107
                                                 ======           ======       ======   ======   ======
Shares used in diluted per share
  computation:
  Historical LJL BioSystems common stock...      14,000           11,969       12,506    9,283    4,504
  Assumed conversion of outstanding LJL
     BioSystems mandatorily redeemable
     convertible preferred stock...........          --               --           --      704    2,064
                                                 ------           ------       ------   ------   ------
                                                 14,000           11,969       12,506    9,987    6,568
                                                   0.30             0.30         0.30     0.30     0.30
                                                 ------           ------       ------   ------   ------
                                                  4,200            3,591        3,752    2,996    1,970
  Historical LJL BioSystems stock
     options...............................       1,970            1,762        1,852    1,498      830
  Exchange ratio...........................        0.30             0.30         0.30     0.30     0.30
                                                 ------           ------       ------   ------   ------
                                                    591              529          556      449      249
  Dilutive effect of converted stock
     options...............................         409              292          326      231      215
  Historical Molecular Devices.............      10,596            9,963       10,071    9,738    9,721
                                                 ------           ------       ------   ------   ------
  Pro forma combined.......................      15,205           13,846       14,149   12,965   11,906
                                                 ======           ======       ======   ======   ======
</TABLE>

NOTE 3


     It is anticipated that the combined company will incur estimated direct
transaction charges of approximately $17.5 million related to the proposed
merger of Molecular Devices with LJL BioSystems, principally in the quarter in
which the proposed merger is consummated. These charges include estimated
investment banking and financial advisory fees of approximately $10.0 million,
and other estimated merger related expenses totaling $7.5 million consisting
primarily of other professional services, estimated registration expenses and
various employee redeployment, retention and severance costs. These anticipated
charges are preliminary estimates and are subject to change. Actual amounts
ultimately incurred could differ from the estimated amounts. The actual amounts
will be charged to the statement of income in the period the transaction is
consummated. Additionally, the direct transaction charges do not include
integration costs which may be incurred as of and subsequent to the merger.
Neither Molecular Devices nor LJL BioSystems has estimated the amount or nature
of integration costs.


NOTE 4

     Pro forma adjustments have been made to reduce valuation allowances
previously provided for financial reporting purposes by LJL BioSystems against
deferred tax assets attributable to its net operating loss carry-forwards and
temporary differences. Because Molecular Devices and LJL BioSystems will file

                                       93
<PAGE>   102

                          NOTES TO UNAUDITED PRO FORMA


              CONDENSED COMBINED FINANCIAL STATEMENTS (CONTINUED)


consolidated income tax returns subsequent to the merger, the LJL BioSystems
temporary differences will be realized for income tax purposes against combined
future taxable income. The LJL BioSystems net operating loss carryforwards are
subject to certain annual limitations because of the change of ownership rules
under federal and state tax law. Because of Molecular Devices' history of
taxable income, and its ability to utilize such carry-forwards against combined
future taxable income through appropriate tax planning, the valuation allowance
against the deferred tax asset for such carryforwards has been reduced to
reflect the anticipated benefit available under the annual limitations imposed
by the change of ownership provisions.

                                       94
<PAGE>   103

                 DESCRIPTION OF MOLECULAR DEVICES CAPITAL STOCK

GENERAL

     The following describes certain of the provisions of the certificate of
incorporation and bylaws of Molecular Devices. Molecular Devices' certificate of
incorporation and bylaws are included as exhibits to the registration statement
of which this joint proxy statement/prospectus is a part. The authorized capital
stock of Molecular Devices consists of 30,000,000 shares of common stock, $.001
par value, and 3,000,000 shares of preferred stock, $.001 par value.

MOLECULAR DEVICES COMMON STOCK


     As of June 30, 2000, there were 11,501,673 shares of common stock
outstanding held of record by 91 stockholders. The holders of common stock are
entitled to one vote for each share held of record on all matters submitted to a
vote of the stockholders. The holders of common stock are not entitled to
cumulative voting rights with respect to the election of directors, and as a
consequence, minority stockholders will not be able to elect directors on the
basis of their votes alone. Subject to preferences that may be applicable to any
then outstanding preferred stock, holders of common stock are entitled to
receive ratably such dividends as may be declared by the board of directors out
of funds legally available therefor. In the event of a liquidation, dissolution
or winding up of Molecular Devices, holders of the common stock are entitled to
share ratably in all assets remaining after payment of liabilities and the
liquidation preference of any then outstanding preferred stock. Holders of
common stock have no preemptive rights and no right to convert their common
stock into any other securities. There are no redemption or sinking fund
provisions applicable to the common stock. All outstanding shares of common
stock are fully paid and nonassessable. The rights, preferences and privileges
of holders of Molecular Devices common stock are subject to those of holders of
Molecular Devices preferred stock.


MOLECULAR DEVICES PREFERRED STOCK

     The board of directors has the authority, without further action by the
stockholders, to issue up to 3,000,000 shares of preferred stock in one or more
series and to fix the rights, preferences, privileges and restrictions thereof,
including dividend rights, conversion rights, voting rights, terms of
redemption, liquidation preferences, sinking fund terms and the number of shares
constituting any series or the designation of such series. The issuance of
preferred stock could adversely affect the voting power of holders of common
stock and the likelihood that such holders will receive dividend payments and
payments upon liquidation and could have the effect of delaying, deferring or
preventing a change in control of Molecular Devices. Molecular Devices has no
present plan to issue any shares of preferred stock.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for the Molecular Devices common stock is
EquiServe, L.P.

                                       95
<PAGE>   104

              COMPARATIVE RIGHTS OF MOLECULAR DEVICES STOCKHOLDERS
                        AND LJL BIOSYSTEMS STOCKHOLDERS

     Upon consummation of the merger, LJL BioSystems stockholders will become
stockholders of Molecular Devices. Because Molecular Devices and LJL BioSystems
are both Delaware corporations, LJL BioSystems stockholders' rights will
continue to be governed by the Delaware General Corporation Law (the "DGCL").
Additionally, as stockholders of LJL BioSystems, their rights are presently
governed by LJL BioSystems' amended and restated certificate of incorporation
(the "LJL BioSystems Charter") and LJL BioSystems' amended and restated bylaws
(the "LJL BioSystems Bylaws"). As stockholders of Molecular Devices, their
rights will be governed by Molecular Devices' amended and restated certificate
of incorporation (the "Molecular Devices Charter") and Molecular Devices' bylaws
(the "Molecular Devices Bylaws"). The following discussion summarizes only the
material differences between the rights of holders of Molecular Devices common
stock and holders of LJL BioSystems common stock under the charters and bylaws
of Molecular Devices and LJL BioSystems. This summary does not purport to be
complete and is qualified in its entirety by reference to the Molecular Devices
Charter and Bylaws, and the LJL BioSystems Charter and Bylaws and the relevant
provisions of the DGCL.

SIZE OF THE BOARD OF DIRECTORS

     Delaware law permits a corporation's board of directors alone to change the
authorized number or range of directors by amendment of the corporation's
bylaws, unless otherwise prohibited by the corporation's certificate of
incorporation (in which case a change in the number of directors may be made
only upon approval of such change by the stockholders). In any case, no
reduction in the authorized number of directors may have the effect of removing
any director before that director's term of office expires. The ability of the
board of directors to alter size without stockholder approval enables a
corporation to respond quickly to a potential opportunity to attract the
services of a qualified director or to eliminate a vacancy for which a suitable
candidate is not available.


     The LJL BioSystems Bylaws provide for a board of directors of seven.
Directors are elected at each annual meeting of the LJL BioSystems stockholders.
The number of directors may be changed by a resolution of the board of directors
or of the stockholders. The Molecular Devices board of directors currently
consists of eight members. Directors are elected at each annual meeting of
Molecular Devices stockholders. The Molecular Devices Charter provides that the
board of directors, by resolution, may fix the number of directors which, as
noted above, is currently eight.



     The merger agreement provides that the Molecular Devices board of directors
must use commercially reasonable efforts to attempt to cause, as of the
effective time, Lev J. Leytes to be elected to the board of directors of
Molecular Devices. In order to accommodate the election of Lev J. Leytes to the
board of directors of Molecular Devices, the board of directors will, by
resolution, increase the number of directors of Molecular Devices to nine
directors and fill the vacancy created by such increase by appointing Lev J.
Leytes to the board of directors (See "-- Filling New Seats or Vacancies on the
Board of Directors" below).


REMOVAL OF DIRECTORS

     Under Delaware law a director may be removed, with or without cause, by the
holders of a majority of the then outstanding shares entitled to vote thereon
unless (i) the corporation has a classified board of directors, in which case a
director may be removed only with cause, or (ii) the corporation has cumulative
voting, in which case, if less than the entire board is to be removed, no
director may be removed without cause if the number of votes cast against such
removal would be sufficient to elect the director under cumulative voting.

     The LJL BioSystems Bylaws provide removal, with or without cause, by
stockholders holding a majority of the outstanding shares entitled to vote for
directors. The Molecular Devices Bylaws provide that a director may be removed
for cause by stockholders holding a majority of the then outstanding shares
entitled to vote for directors. For removal without cause, however, the
Molecular Devices Bylaws
                                       96
<PAGE>   105

require that holders of at least 66 2/3% of the voting power of all the then
outstanding shares of voting stock vote in favor of removal.

FILLING NEW SEATS OR VACANCIES ON THE BOARD OF DIRECTORS

     Under Delaware law, vacancies and newly created directorships may be filled
by a majority of the directors then in office (even though less than a quorum),
unless (i) otherwise provided in the corporation's certificate of incorporation
or bylaws, or (ii) the certificate of incorporation directs that a particular
class is to elect such director, in which case any other directors elected by
such class, or a sole remaining director, shall fill such vacancy.

     The LJL BioSystems Bylaws provide that vacancies created by an increase in
the authorized number of directors may be filled by a majority of the directors
then in office, although less than a quorum, or by a sole remaining director.
Vacancies created by the resignation of one or more directors may be filled by a
majority of the board of directors then in office, including those who have so
resigned. Vacancies in the LJL BioSystems board of directors created by the
removal of a director by the vote of the stockholders or by court order may be
filled only by a vote of the stockholders. Notwithstanding the foregoing,
however, where the LJL BioSystems Charter provides that the holders of a
particular class is to elect one or more directors, only the directors so
elected by such class, or a sole remaining director so elected, may fill a
vacancy.

     The Molecular Devices Charter provides that, subject to the rights of any
preferred stockholders to elect directors, new seats on the Molecular Devices
board of directors or vacancies occurring for any cause, including newly created
directorships resulting from any increase in the authorized number of directors,
may be filled only by an affirmative vote of the majority of the directors then
in office, even though less than a quorum. Although such vacancies may only be
filled by an affirmative vote of the majority of directors then in office, the
Molecular Devices Charter and Bylaws provide that the directors may, by
resolution, direct that such vacancies be filled by the stockholders.

INDEMNIFICATION AND LIMITATION OF LIABILITY

     Delaware law permits, with certain exceptions, a corporation to adopt
charter provisions eliminating the liability of its directors to the corporation
or its stockholders for monetary damages for breach of the directors' fiduciary
duty of care. Under Delaware law, such a provision may not eliminate or limit
director monetary liability for: (a) breaches of the director's duty of loyalty
to the corporation or its stockholders; (b) acts or omissions not in good faith
or involving intentional misconduct or knowing violations of law; (c) the
payment of unlawful dividends or unlawful stock repurchases or redemptions; or
(d) transactions in which the director received an improper personal benefit.

     The LJL BioSystems Charter eliminates the liability of directors to the
corporation to the fullest extent permissible under Delaware law. The Molecular
Devices Charter eliminates the liability of directors to Molecular Devices or
its stockholders for monetary damages for breach of fiduciary duty as a director
to the fullest extent permissible under Delaware law and recites the exceptions
referred to above. Such limitation of liability provisions may not, however,
limit a director's liability for violation of, or otherwise relieve Molecular
Devices or LJL BioSystems or their directors from the necessity of complying
with, federal or state securities laws, or affect the availability of
nonmonetary remedies such as injunctive relief or rescission.

     Delaware law generally permits indemnification of expenses, including
attorneys' fees, actually and reasonably incurred in the defense or settlement
of a derivative or third-party action, provided there is a determination by a
majority vote of a disinterested quorum of the directors, by independent legal
counsel or by a majority vote of a quorum of the stockholders that the person
seeking indemnification acted in good faith and in a manner reasonably believed
to be in the best interests of the corporation. Without court approval, however,
no indemnification may be made in respect of any derivative action in which such
person is adjudged liable for negligence or misconduct in the performance of his
or her duty to the

                                       97
<PAGE>   106

corporation. Delaware law requires indemnification of expenses when the
individual being indemnified has successfully defended any action, claim, issue
or matter therein, on the merits or otherwise.

     Expenses incurred by an officer or director in defending an action may be
paid in advance, under Delaware law, if such director or officer undertakes to
repay such amounts if it is ultimately determined that he or she is not entitled
to indemnification. In addition, Delaware law authorizes a corporation's
purchase of indemnity insurance for the benefit of its officers, directors,
employees and agents whether or not the corporation would have the power to
indemnify against the liability covered by the policy.

     The LJL BioSystems Charter permits indemnification beyond that expressly
mandated by Delaware law subject only to the limits on such excess
indemnification set forth by Delaware law. In addition, the LJL BioSystems
Bylaws contain provisions to further the indemnification provisions set forth in
its charter. The Molecular Devices Bylaws provide that the corporation shall
indemnify its directors and officers to the fullest extent permitted by Delaware
law; provided, however, that the corporation may modify the extent of such
indemnification by contracts with its directors and executive officers. Delaware
law states that the indemnification provided by statute shall not be deemed
exclusive of any other rights under any bylaw, agreement, vote of stockholders,
or of disinterested directors, or otherwise.

INTERESTED DIRECTOR TRANSACTIONS

     Under Delaware law, certain contracts or transactions in which one or more
of a corporation's directors have an interest are not void or voidable because
of such interest if certain conditions are met. Under Delaware law, (a) either
the stockholders or the board of directors must approve any such contract or
transaction after full disclosure of the material facts, and, in the case of
board approval, the contract or transaction must also be "fair" to the
corporation, or (b) the contract or transaction must have been "fair" as to the
corporation at the time it was approved. If stockholder approval is sought
generally, the contract or transaction must be approved in good faith by a
majority of disinterested stockholders. If board approval is sought, the
contract or transaction must be approved by a majority of the disinterested
directors (even though less than a majority of a quorum).

ELIMINATION OF ACTIONS BY WRITTEN CONSENT OF STOCKHOLDERS

     Under Delaware law, stockholders may execute an action by written consent
in lieu of a stockholder meeting. Delaware law permits a corporation in its
charter to eliminate such actions by written consent. Both the LJL BioSystems
Charter and the Molecular Devices Charter prohibit stockholder actions by
written consent.


     Elimination of the ability of stockholders to act by written consent could
lengthen the amount of time required to take stockholder actions, since certain
actions by written consent are not subject to the minimum notice requirement of
a stockholders' meeting. The elimination of stockholder actions by written
consents, however, could deter hostile takeover attempts. A holder or group of
holders controlling a majority interest of Molecular Devices common stock or LJL
BioSystems common stock would not be able to amend the respective charters or
bylaws or remove directors pursuant to a stockholder action by written consent,
but instead, would have to call a stockholders' meeting and observe the notice
periods determined by the each board pursuant to the each company's bylaws prior
to attempting to obtain approval of any such action.


POWER TO CALL SPECIAL MEETINGS OF STOCKHOLDERS

     Pursuant to the DGCL, special meetings of stockholders may be called by a
corporation's board of directors or by such person or persons as may be
authorized by such corporation's certificate of incorporation or bylaws.

     Under the LJL BioSystems Bylaws, a special meeting of stockholders may be
called by the board of directors, the chairman of the board, the president, or
by one or more holders of shares entitled to cast not less than 10% of the votes
at such meeting. The Molecular Devices Bylaws provide that special meetings

                                       98
<PAGE>   107

of stockholders may be called by the chairman of the board, the CEO, the board
of directors pursuant to a resolution adopted by a majority of the total number
of authorized directors, or by the holders of shares entitled to cast not less
than 10% of the votes at the meeting. Both the Molecular Devices Bylaws and the
LJL BioSystems Bylaws further provide that only such business shall be conducted
at a special meeting of stockholders as shall have been specified in the notice
of such meeting.

STOCKHOLDER APPROVAL OF CERTAIN BUSINESS COMBINATIONS

     In recent years, a number of states have adopted special laws designed to
make certain kinds of "unfriendly" corporate takeovers, or other transactions
involving a corporation and one or more of its significant stockholders, more
difficult. Under Section 203 of the DGCL, certain "business combinations" with
"interested stockholders" of Delaware corporations are subject to a three-year
moratorium unless specified conditions are met. Under Section 203 of the DGCL,
certain business combinations with a majority stockholder require the delivery
of a fairness opinion.

     Section 203 prohibits a Delaware corporation from engaging in a "business
combination" with an "interested stockholder" for three years following the date
that such person becomes an interested stockholder. With certain exceptions, an
interested stockholder is a person or group who or which owns 15% or more of the
corporation's outstanding voting stock (including any rights to acquire stock
pursuant to an option, warrant, agreement, arrangement or understanding, or upon
the exercise of conversion or exchange rights, and stock with respect to which
the person has voting rights only), or is an affiliate or associate of the
corporation and was the owner of 15% or more of such voting stock at any time
within the previous three years.

     For purposes of Section 203, the term "business combination" is defined
broadly to include mergers with or caused by the interested stockholder; sales
or other dispositions to the interested stockholder (except proportionately with
the corporation's other stockholders) of assets of the corporation or a
subsidiary equal to 10% or more of the aggregate market value of the
corporation's consolidated assets or its outstanding stock; the issuance or
transfer by the corporation or a subsidiary of stock of the corporation or such
subsidiary to the interested stockholder (except for transfers in a conversion
or exchange or a pro rata distribution or certain other transactions, none of
which increase the interested stockholder's proportionate ownership of any class
or series of the corporation's or such subsidiary's stock); or receipt by the
interested stockholder of the benefit (except proportionately as a stockholder),
directly or indirectly, of any loans, advances, guarantees, pledges, or other
financial benefits provided by or through the corporation or a subsidiary.

     The three-year moratorium imposed on business combinations by Section 203
does not apply if (i) prior to the date on which such stockholder becomes an
interested stockholder, the board of directors approves either the business
combination or the transaction which resulted in the person becoming an
interested stockholder; (ii) the interested stockholder owns 85% of the
corporation's voting stock upon consummation of the transaction which made him
or her an interested stockholder (excluding from the 85% calculation shares
owned by directors who are also officers of the target corporation and shares
held by employee stock plans which do not permit employees to decide
confidentially whether to accept a tender or exchange offer); or (iii) on or
after the date such person becomes an interested stockholder, the board approves
the business combination, and it is also approved at a stockholder meeting by
66 2/3% of the voting stock not owned by the interested stockholder.

     Section 203 only applies to Delaware corporations which, like Molecular
Devices, (i) have a class of voting stock that is listed on a national
securities exchange, are quoted on an interdealer quotation system such as the
Nasdaq National Market or (ii) are held of record by more than 2,000
stockholders. However, a Delaware corporation may elect not to be governed by
Section 203 by a provision in its original certificate of incorporation or an
amendment thereto or to its bylaws, which amendment must be approved by majority
stockholder vote and may not be further amended by the board of directors.
Molecular Devices has not elected not to be governed by Section 203; therefore,
Section 203 will apply to Molecular Devices.

                                       99
<PAGE>   108

     Section 203 has been challenged in lawsuits arising out of ongoing takeover
disputes, and it is not yet clear whether and to what extent its
constitutionality will be upheld by the courts. Although the United States
District Court for the District of Delaware has consistently upheld the
constitutionality of Section 203, the Delaware Supreme Court has not yet
considered the issue. LJL BioSystems believes that so long as the
constitutionality of Section 203 is upheld, Section 203 will encourage any
potential acquiror to negotiate with the Molecular Devices board. Section 203
also has the effect of limiting the ability of a potential acquiror to make a
two-tiered bid for Molecular Devices in which all stockholders would not be
treated equally. LJL BioSystems stockholders should note that the application of
Section 203 to Molecular Devices will confer upon the Molecular Devices board
the power to reject a proposed business combination, even though a potential
acquiror could be offering a substantial premium for Molecular Devices' shares
over the then current market price (assuming the stock is then publicly traded).
Section 203 may also discourage certain potential acquirors unwilling to comply
with its provisions.

MERGERS

     Delaware law generally requires that a majority of the holders of the stock
of each of the acquiring and target corporations approve statutory mergers.
Delaware law does not require a stockholder vote of the surviving corporation in
a merger (unless the corporation provides otherwise in its certificate of
incorporation) if (a) the merger agreement does not amend the existing
certificate of incorporation, (b) each share of the surviving corporation
outstanding before the merger is an identical outstanding share after the
merger, and (c) the number of shares to be issued by the surviving corporation
in the merger does not exceed 20% of the shares outstanding immediately prior to
the merger. Delaware law also requires that a sale of all or substantially all
of the assets of a corporation be approved by a majority of the voting shares of
the corporation transferring such assets.

     Delaware law does not generally require class voting with respect to
stockholder approval of mergers, reorganizations, certain sales of assets and
similar transactions. In general, class voting is only required in certain
transactions involving an amendment to the certificate of incorporation which
adversely affects a specific class of shares. The Molecular Devices Charter and
the LJL BioSystems Charter do not require class voting.

DISSENTERS' RIGHTS

     Under Delaware law, a stockholder of a corporation participating in certain
major corporate transactions may, under varying circumstances, be entitled to
dissenters' rights pursuant to which such stockholder may receive cash in the
amount of the fair market value of his, her or its shares in lieu of the
consideration he, she or it would otherwise receive in the transaction.

     Delaware law provides, however, that dissenters' rights are not available
(a) with respect to the sale, lease or exchange of all or substantially all of
the assets of a corporation, (b) with respect to a merger or consolidation by a
corporation whose shares are either listed on a national securities exchange or
are held of record by more than 2,000 holders if such stockholders receive only
shares of the surviving corporation or shares of any other corporation which are
either listed on a national securities exchange or held of record by more than
2,000 holders, plus cash in lieu of fractional shares, or (c) to stockholders of
a corporation surviving a merger if, among other conditions, no vote of the
stockholders of the surviving corporation is required to approve the merger
because the merger agreement does not amend the existing certificate of
incorporation, each share of the surviving corporation outstanding prior to the
merger is an identical outstanding or treasury share after the merger, and the
number of shares to be issued in the merger does not exceed 20% of the shares of
the surviving corporation outstanding immediately prior to the merger. As a
result, neither the LJL BioSystems stockholders nor the Molecular Devices
stockholders will have dissenters' rights.

                                       100
<PAGE>   109

     THE FOREGOING IS AN ATTEMPT TO SUMMARIZE THE MATERIAL DIFFERENCES IN THE
LJL BIOSYSTEMS CHARTER AND THE MOLECULAR DEVICES CHARTER AND THE LJL BIOSYSTEMS
BYLAWS AND THE MOLECULAR DEVICES BYLAWS AND DOES NOT PURPORT TO BE A COMPLETE
LISTING OF DIFFERENCES IN THE RIGHTS AND REMEDIES OF STOCKHOLDERS OF LJL
BIOSYSTEMS AND MOLECULAR DEVICES. SUCH DIFFERENCES CAN BE DETERMINED IN FULL BY
REFERENCE TO DELAWARE LAW AND THE LJL BIOSYSTEMS CHARTER AND THE MOLECULAR
DEVICES CHARTER AND THE LJL BIOSYSTEMS BYLAWS AND THE MOLECULAR DEVICES BYLAWS.
IN ADDITION, DELAWARE LAW PROVIDES THAT SOME OF THE STATUTORY PROVISIONS, AS
THEY AFFECT VARIOUS RIGHTS OF HOLDERS OF SHARES, MAY BE MODIFIED BY PROVISIONS
IN THE CHARTER OR BYLAWS OF THE CORPORATION.

                                       101
<PAGE>   110

                              INDEPENDENT AUDITORS


     It is expected that representatives of Ernst & Young LLP (on behalf of
Molecular Devices) and PricewaterhouseCoopers LLP (on behalf of LJL BioSystems)
will be present at the respective special meetings of stockholders to respond to
appropriate questions of stockholders and to make a statement if they so desire.


                                 LEGAL MATTERS

     The validity of the Molecular Devices common stock to be issued in the
merger has been passed upon for Molecular Devices by Cooley Godward LLP. Certain
tax consequences of the merger have been passed upon for Molecular Devices by
Cooley Godward LLP and for LJL BioSystems by Venture Law Group, A Professional
Corporation.

                                    EXPERTS


     Ernst & Young LLP, independent auditors, have audited Molecular Devices'
consolidated financial statements and schedule included in Molecular Devices'
annual report on Form 10-K for the year ended December 31, 1999, as set forth in
their report, which is incorporated in this joint proxy statement/ prospectus by
reference. Molecular Devices' consolidated financial statements and schedule are
incorporated by reference in reliance on Ernst & Young LLP's report, given on
their authority as experts in accounting and auditing.



     The consolidated financial statements of LJL BioSystems, Inc. incorporated
in this joint proxy statement/prospectus by reference to LJL BioSystems' annual
report on Form 10-K for the year ended December 31, 1999, have been so
incorporated in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.


                             STOCKHOLDER PROPOSALS

     The deadline for submitting a stockholder proposal for inclusion in the
Molecular Devices' proxy statement and form of proxy for the Molecular Devices'
2001 annual meeting of stockholders pursuant to Rule 14a-8 of the Securities and
Exchange Commission is December 21, 2000. The deadline for submitting a
stockholder proposal or a nomination for director that is not to be included in
such proxy statement and proxy is February 19, 2001. Such proposal or
nomination, however, may not be submitted before January 20, 2001. Stockholders
are also advised to review Molecular Devices' By-laws, which contain additional
requirements with respect to advance notice of stockholder proposals and
director nominations.


     If the merger is not consummated, proposals of stockholders intended to be
presented at LJL BioSystems' next annual meeting of stockholders must be
received by Robert T. Beggs, LJL BioSystems, Inc., 405 Tasman Drive, Sunnyvale,
California 94089, no later than December 21, 2000. If LJL BioSystems is not
notified of a stockholder proposal by March 5, 2001, then the proxies held by
management of LJL BioSystems provide discretionary authority to vote against
such stockholder proposal, even though such proposal is not discussed in the
proxy statement.


                      WHERE YOU CAN FIND MORE INFORMATION

     Molecular Devices and LJL BioSystems each file annual, quarterly and
current reports, proxy statements and other information with the SEC. You may
read and copy any reports, statements or other information that the companies
file at the SEC's public reference rooms in Washington, D.C., New York, New York
and Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further
information on the public reference rooms. Molecular Devices' and LJL
BioSystems' public filings are also available to the public from commercial
document retrieval services and at the Internet web site maintained by the SEC

                                       102
<PAGE>   111

at http://www.sec.gov. Reports, proxy statements and other information
concerning Molecular Devices and LJL BioSystems also may be inspected at the
offices of the National Association of Securities Dealers, Inc., Listing
Section, 1735 K Street, Washington, D.C. 20006.

     Molecular Devices has filed a Form S-4 registration statement to register
with the SEC the offering and sale of the shares of Molecular Devices common
stock to be issued to LJL BioSystems stockholders in the merger. This joint
proxy statement/prospectus is a part of such registration statement and
constitutes a prospectus and proxy statement of Molecular Devices and a proxy
statement of LJL BioSystems for the special meeting.

     As allowed by SEC rules, this joint proxy statement/prospectus does not
contain all the information that stockholders can find in the registration
statement or the exhibits to the registration statement.

     The SEC allows Molecular Devices and LJL BioSystems to incorporate
information into this joint proxy statement/prospectus "by reference," which
means that the companies can disclose important information to you by referring
you to another document filed separately with the SEC. The information
incorporated by reference is deemed to be part of this joint proxy
statement/prospectus, except for any information superseded by information
contained directly in this joint proxy statement/prospectus. This joint proxy
statement/prospectus incorporates by reference the documents set forth below
that Molecular Devices and LJL BioSystems have previously filed with the SEC.
These documents contain important information about the companies and their
financial condition.

MOLECULAR DEVICES FILINGS (FILE NO. 0-27316):


     - Annual Report on Form 10-K for the fiscal year ended December 31, 1999.



     - Quarterly Report on Form 10-Q for the fiscal quarter ended March 31,
       2000.


     - Current Reports on Form 8-K filed April 14, 2000 and June 12, 2000.

     - The description of the Molecular Devices common stock set forth in the
       Registration Statement on Form 8-A filed with the SEC on December 1,
       1995, including any amendments or reports filed for the purpose of
       updating such description.

     - Molecular Devices' definitive proxy statement, dated April 25, 2000,
       filed in connection with its 2000 annual meeting of stockholders.

LJL BIOSYSTEMS FILINGS (FILE NO. 0-27446):


     - Annual Report on Form 10-K for the fiscal year ended December 31, 1999.



     - Quarterly Report on Form 10-Q for the fiscal quarter ended March 31,
       2000.


     - Current Reports on Form 8-K filed on January 12, 2000, January 13, 2000,
       January 26, 2000, February 3, 2000, February 9, 2000, February 16, 2000,
       February 22, 2000, March 14, 2000, April 10, 2000, April 20, 2000, April
       26, 2000, June 8, 2000 and June 15, 2000 and on Form 8-K/A on February
       10, 2000.

     - LJL BioSystems' definitive proxy statement, dated April 26, 2000, filed
       in connection with its 2000 annual meeting of stockholders.

     Molecular Devices and LJL BioSystems hereby incorporate by reference
additional documents that Molecular Devices or LJL BioSystems may file with the
SEC between the date of this joint proxy statement/prospectus and the date of
the respective special meetings. These include periodic reports, such as annual
reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form
8-K, as well as proxy statements.

     Molecular Devices has supplied all information contained or incorporated by
reference in this joint proxy statement/prospectus relating to Molecular Devices
or Merger Sub, and LJL BioSystems has supplied all such information relating to
LJL BioSystems.
                                       103
<PAGE>   112

     If you are a stockholder, you may have received some of the documents
incorporated by reference. You may also obtain any of such documents from the
appropriate company or the SEC or the SEC's Internet web site described above.
Documents incorporated by reference are available from the appropriate company
without charge, excluding all exhibits unless specifically incorporated by
reference as an exhibit in this joint proxy statement/prospectus. Stockholders
may obtain documents incorporated by reference in this joint proxy
statement/prospectus by requesting them in writing or by telephone from the
appropriate company at the following addresses:

                         MOLECULAR DEVICES CORPORATION
                               1311 Orleans Drive
                          Sunnyvale, California 94089

                         Attention: Investor Relations

                              Tel: (408) 747-1700

                              LJL BIOSYSTEMS, INC.
                                405 Tasman Drive
                          Sunnyvale, California 94089
                         Attention: Investor Relations
                              Tel: (408) 548-0542


     If you would like to request documents, please do so by August 23, 2000 to
receive them before the special meeting. If you request any incorporated
documents, the appropriate company will mail them to you by first-class mail, or
other equally prompt means, within one business day of receipt of your request.



     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS JOINT PROXY STATEMENT/PROSPECTUS TO VOTE YOUR SHARES AT THE
SPECIAL MEETING. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION
THAT DIFFERS FROM THAT CONTAINED IN THIS JOINT PROXY STATEMENT/PROSPECTUS. THIS
JOINT PROXY STATEMENT/PROSPECTUS IS DATED JULY      , 2000. YOU SHOULD NOT
ASSUME THAT THE INFORMATION CONTAINED IN THIS JOINT PROXY STATEMENT/PROSPECTUS
IS ACCURATE AS OF ANY DATE OTHER THAN THAT DATE, AND NEITHER THE MAILING OF THIS
JOINT PROXY STATEMENT/PROSPECTUS TO STOCKHOLDERS NOR THE ISSUANCE OF SHARES OF
MOLECULAR DEVICES COMMON STOCK IN THE MERGER SHALL CREATE ANY IMPLICATION TO THE
CONTRARY.


     Molecular Devices Corporation, the Molecular Devices Corporation logos and
all other Molecular Devices product and service names are registered trademarks
or trademarks of Molecular Devices Corporation in the USA and in other select
countries. LJL BioSystems, the LJL BioSystems logos and all other LJL BioSystems
product and service names are registered trademarks or trademarks of LJL
BioSystems, Inc. in the USA and in other select countries. "(R)" and "TM"
indicate USA registration and USA trademark, respectively. Other third party
logos and product/trade names are registered trademarks or trade names of their
respective companies.

                                       104
<PAGE>   113

                                                                         ANNEX A

                AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

                                     AMONG:

                         MOLECULAR DEVICES CORPORATION
                            A DELAWARE CORPORATION;

                         MERCURY ACQUISITION SUB, INC.,
                          A DELAWARE CORPORATION; AND

                             LJL BIOSYSTEMS, INC.,
                             A DELAWARE CORPORATION

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

                            DATED AS OF JUNE 7, 2000
                            ------------------------

                                       A-1
<PAGE>   114

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                               PAGE
                                                                               ----
<S>       <C>    <C>                                                           <C>
SECTION   1.     DESCRIPTION OF TRANSACTION..................................   A-5
          1.1    Merger of Merger Sub into the Company.......................   A-5
          1.2    Effect of the Merger........................................   A-5
          1.3    Closing; Effective Time.....................................   A-5
          1.4    Certificate of Incorporation and Bylaws; Directors and
                 Officers....................................................   A-6
          1.5    Conversion of Shares........................................   A-6
          1.6    Closing of the Company's Transfer Books.....................   A-7
          1.7    Exchange of Certificates....................................   A-7
          1.8    Reserved....................................................   A-8
          1.9    Dissenting Shares...........................................   A-8
          1.10   Reserved....................................................   A-8
          1.11   Tax Consequences............................................   A-8
          1.12   Accounting Consequences.....................................   A-8
          1.13   Further Action..............................................   A-8
SECTION   2.     REPRESENTATIONS AND WARRANTIES OF THE COMPANY...............   A-9
          2.1    Due Organization; Subsidiaries; Etc.........................   A-9
          2.2    Certificate of Incorporation and Bylaws.....................   A-9
          2.3    Capitalization, Etc.........................................   A-9
          2.4    SEC Filings; Financial Statements...........................  A-10
          2.5    Absence of Changes..........................................  A-11
          2.6    Title to Assets.............................................  A-13
          2.7    Receivables; Customers......................................  A-13
          2.8    Real Property; Leasehold....................................  A-13
          2.9    Intellectual Property.......................................  A-13
          2.10   Contracts...................................................  A-15
          2.11   Sale of Products; Performance of Services...................  A-17
          2.12   Liabilities.................................................  A-17
          2.13   Compliance with Legal Requirements..........................  A-18
          2.14   Certain Business Practices..................................  A-18
          2.15   Governmental Authorizations.................................  A-18
          2.16   Tax Matters.................................................  A-18
          2.17   Employee and Labor Matters; Benefit Plans...................  A-19
          2.18   Environmental Matters.......................................  A-21
          2.19   Insurance...................................................  A-22
          2.20   Transactions with Affiliates................................  A-22
          2.21   Legal Proceedings; Orders...................................  A-22
          2.22   Authority; Inapplicability of Anti-takeover Statutes;
                 Binding Nature of Agreement.................................  A-22
          2.23   Section 203 of the DGCL Not Applicable......................  A-23
          2.24   Reserved....................................................  A-23
          2.25   Reserved....................................................  A-23
          2.26   Accounting Matters..........................................  A-23
          2.27   Vote Required...............................................  A-23
          2.28   Non-Contravention; Consents.................................  A-23
          2.29   Fairness Opinion............................................  A-24
          2.30   Financial Advisor...........................................  A-24
          2.31   Full Disclosure.............................................  A-24
SECTION   3.     REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB.....  A-25
          3.1    Organization, Standing and Power............................  A-25
          3.2    SEC Filings; Financial Statements...........................  A-25
</TABLE>

                                       A-2
<PAGE>   115
                        TABLE OF CONTENTS -- (CONTINUED)

<TABLE>
<CAPTION>
                                                                               PAGE
                                                                               ----
<S>       <C>    <C>                                                           <C>
          3.3    Full Disclosure.............................................  A-25
          3.4    Authority; Binding Nature of Agreement......................  A-26
          3.5    Vote Required...............................................  A-26
          3.6    Non-Contravention; Consents.................................  A-26
          3.7    Valid Issuance..............................................  A-27
          3.8    Accounting Matters..........................................  A-27
          3.9    Capitalization, Etc.........................................  A-27
          3.10   Intellectual Property.......................................  A-28
          3.11   Employee and Labor Matters..................................  A-29
          3.12   Legal Proceedings; Orders...................................  A-29
          3.13   Fairness Opinion............................................  A-29
          3.14   Financial Advisor...........................................  A-30
          3.15   Absence of Changes..........................................  A-30
          3.16   Liabilities.................................................  A-30
          3.17   Compliance with Legal Requirements..........................  A-30
SECTION   4.     CERTAIN COVENANTS OF THE COMPANY............................  A-31
          4.1    Access and Investigation....................................  A-31
          4.2    Operation of the Company's Business.........................  A-31
          4.3    No Solicitation.............................................  A-34
          4.4    Operation of Parent's Business..............................  A-35
SECTION   5.     ADDITIONAL COVENANTS OF THE PARTIES.........................  A-36
          5.1    Registration Statement; Joint Prospectus/Proxy Statement....  A-36
          5.2    Company Stockholders' Meeting...............................  A-36
          5.3    Parent Stockholders' Meeting................................  A-37
          5.4    Regulatory Approvals........................................  A-38
          5.5    Stock Options and Warrants..................................  A-38
          5.6    Employee Benefits...........................................  A-40
          5.7    Indemnification of Officers and Directors...................  A-40
          5.8    Pooling of Interests........................................  A-41
          5.9    Additional Agreements.......................................  A-41
          5.10   Disclosure..................................................  A-41
          5.11   Affiliate Agreements........................................  A-42
          5.12   Tax Matters.................................................  A-42
          5.13   Letter of the Company's Independent Accountants.............  A-42
          5.14   Listing.....................................................  A-42
          5.15   Resignation of Officers and Directors.......................  A-42
          5.16   Termination of 401(k) Plan..................................  A-43
          5.17   Parent Board of Directors...................................  A-43
SECTION   6.     CONDITIONS PRECEDENT TO OBLIGATIONS OF PARENT AND MERGER
                 SUB.........................................................  A-43
          6.1    Accuracy of Representations.................................  A-43
          6.2    Performance of Covenants....................................  A-43
          6.3    Effectiveness of Registration Statement.....................  A-43
          6.4    Stockholder Approval........................................  A-43
          6.5    Consents....................................................  A-43
          6.6    Agreements and Documents....................................  A-43
          6.7    HSR Act.....................................................  A-44
          6.8    Reserved....................................................  A-44
          6.9    Reserved....................................................  A-44
          6.10   Listing.....................................................  A-44
</TABLE>

                                       A-3
<PAGE>   116
                        TABLE OF CONTENTS -- (CONTINUED)

<TABLE>
<CAPTION>
                                                                               PAGE
                                                                               ----
<S>       <C>    <C>                                                           <C>
          6.11   No Restraints...............................................  A-44
          6.12   No Governmental Litigation..................................  A-44
          6.13   No Other Litigation.........................................  A-45
SECTION   7.     CONDITIONS PRECEDENT TO OBLIGATION OF THE COMPANY...........  A-45
          7.1    Accuracy of Representations.................................  A-45
          7.2    Performance of Covenants....................................  A-45
          7.3    Effectiveness of Registration Statement.....................  A-45
          7.4    Stockholder Approval........................................  A-45
          7.5    Documents...................................................  A-45
          7.6    HSR Act.....................................................  A-45
          7.7    Listing.....................................................  A-46
          7.8    No Restraints...............................................  A-46
          7.9    No Governmental Litigation..................................  A-46
          7.10   No Other Litigation.........................................  A-46
          7.11   Parent Board of Directors...................................  A-46
SECTION   8.     TERMINATION.................................................  A-46
          8.1    Termination.................................................  A-46
          8.2    Effect of Termination.......................................  A-47
          8.3    Expenses; Termination Fees..................................  A-47
SECTION   9.     MISCELLANEOUS PROVISIONS....................................  A-49
          9.1    Amendment...................................................  A-49
          9.2    Waiver......................................................  A-49
          9.3    No Survival of Representations and Warranties...............  A-49
          9.4    Entire Agreement; Counterparts..............................  A-49
          9.5    Applicable Law; Jurisdiction................................  A-49
          9.6    Disclosure Schedule.........................................  A-49
          9.7    Attorneys' Fees.............................................  A-50
          9.8    Assignability...............................................  A-50
          9.9    Notices.....................................................  A-50
          9.10   Cooperation.................................................  A-51
          9.11   Construction................................................  A-51
</TABLE>

                                       A-4
<PAGE>   117

                AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

     THIS AGREEMENT AND PLAN OF MERGER AND REORGANIZATION ("AGREEMENT") is made
and entered into as of June 7, 2000, by and among: MOLECULAR DEVICES
CORPORATION, a Delaware corporation ("PARENT"); MERCURY ACQUISITION SUB, INC., a
Delaware corporation and a wholly owned subsidiary of Parent ("MERGER SUB"); and
LJL BIOSYSTEMS, INC., a Delaware corporation (the "COMPANY"). Certain
capitalized terms used in this Agreement are defined in Exhibit A.

                                    RECITALS

     A.  Parent, Merger Sub and the Company intend to effect a merger of Merger
Sub into the Company in accordance with this Agreement and the Delaware General
Corporation Law (the "MERGER"). Upon consummation of the Merger, Merger Sub will
cease to exist, and the Company will become a wholly owned subsidiary of Parent.

     B.  It is intended that the Merger qualify as a tax-free reorganization
within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as
amended (the "CODE"). For financial reporting purposes, it is intended that the
Merger be accounted for as a "pooling of interests."

     C.  The respective boards of directors of Parent, Merger Sub and the
Company have approved this Agreement and approved the Merger.

     D.  In order to induce Parent to enter into this Agreement and to
consummate the Merger, certain stockholders of the Company are entering into
Voting Agreements pursuant to which they are agreeing to vote in favor of the
adoption and approval of this Agreement and the approval of the Merger. In order
to induce the Company to enter into this Agreement and to consummate the Merger,
certain stockholders of Parent are entering into Voting Agreements pursuant to
which they are agreeing to vote in favor of the issuance of Parent Common Stock
in connection with the Merger.

                                   AGREEMENT

     The parties to this Agreement, intending to be legally bound, agree as
follows:

SECTION 1.  DESCRIPTION OF TRANSACTION

     1.1  MERGER OF MERGER SUB INTO THE COMPANY.  Upon the terms and subject to
the conditions set forth in this Agreement, at the Effective Time (as defined in
Section 1.3), Merger Sub shall be merged with and into the Company, and the
separate existence of Merger Sub shall cease. The Company will continue as the
surviving corporation in the Merger (the "SURVIVING CORPORATION").

     1.2  EFFECT OF THE MERGER.  The Merger shall have the effects set forth in
this Agreement and in the applicable provisions of the Delaware General
Corporation Law (the "DGCL").

     1.3  CLOSING; EFFECTIVE TIME.  The consummation of the transactions
contemplated by this Agreement (the "CLOSING") shall take place at the offices
of Cooley Godward LLP, located at Five Palo Alto Square, 3000 El Camino Real,
Palo Alto, California, at 10:00 a.m. on a date to be designated by Parent (the
"CLOSING DATE"), which shall be no later than the second business day after the
satisfaction or waiver of the conditions set forth in Section 6 and 7.
Contemporaneously with or as promptly as practicable after the Closing, the
parties hereto shall cause a properly executed certificate of merger conforming
to the requirements of the DGCL (the "CERTIFICATE OF MERGER") to be filed with
the Secretary of State of the State of Delaware. The Merger shall take effect at
the time the Certificate of Merger is filed with the Secretary of State of the
State of Delaware or at such later time as may be specified in the Certificate
of Merger (the "EFFECTIVE TIME").

                                       A-5
<PAGE>   118

     1.4  CERTIFICATE OF INCORPORATION AND BYLAWS; DIRECTORS AND
OFFICERS.  Unless otherwise determined by Parent prior to the Effective Time:

          (a) the Certificate of Incorporation of the Surviving Corporation
     shall be amended and restated as of the Effective Time to substantially
     conform to the Certificate of Incorporation of Merger Sub as in effect
     immediately prior to the Effective Time;

          (b) the Bylaws of the Surviving Corporation shall be amended and
     restated as of the Effective Time to substantially conform to the Bylaws of
     Merger Sub as in effect immediately prior to the Effective Time; and

          (c) the directors and officers of the Surviving Corporation
     immediately after the Effective Time shall be the respective individuals
     who are directors and officers of Merger Sub immediately prior to the
     Effective Time.

     1.5  CONVERSION OF SHARES.

     (a) Subject to the other subsections of this Section 1.5, at the Effective
Time, by virtue of the Merger and without any further action on the part of
Parent, Merger Sub, the Company or any stockholder of the Company:

          (i) any shares of Company Common Stock then held by the Company or any
     Subsidiary of the Company (or held in the Company's treasury) shall be
     canceled and retired and shall cease to exist at the Effective Time, and no
     consideration shall be delivered in exchange therefor;

          (ii) any shares of Company Common Stock then held by Parent, Merger
     Sub or any other Subsidiary of Parent shall be canceled and retired and
     shall cease to exist at the Effective Time, and no consideration shall be
     delivered in exchange therefor;

          (iii) each share of the common stock, $0.001 par value per share, of
     Merger Sub then outstanding shall be converted into one share of common
     stock of the Surviving Corporation; and

          (iv) except as provided in clauses "(i)" and "(ii)" of this sentence,
     each share of Company Common Stock then outstanding shall be converted into
     the right to receive 0.30 of a share of Parent Common Stock (the "EXCHANGE
     RATIO").

     (b) If, between the date of this Agreement and the Effective Time, the
outstanding shares of Company Common Stock or Parent Common Stock are changed
into a different number or class of shares by reason of any stock split,
division or subdivision of shares, stock dividend, reverse stock split,
consolidation of shares, reclassification, recapitalization or other similar
transaction, then the Exchange Ratio shall be appropriately adjusted.

     (c) If any shares of Company Common Stock outstanding immediately prior to
the Effective Time are unvested or are subject to a repurchase option, risk of
forfeiture or other condition under any applicable restricted stock purchase
agreement or other agreement with the Company or under which the Company has any
rights, then the shares of Parent Common Stock issued in exchange for such
shares of Company Common Stock will also be unvested and subject to the same
repurchase option, risk of forfeiture or other condition, and the certificates
representing such shares of Parent Common Stock may accordingly be marked with
appropriate legends. The Surviving Corporation shall take all action that may be
necessary to ensure that, from and after the Effective Time, Parent is entitled
to exercise any such repurchase option or other right set forth in any such
restricted stock purchase agreement or other agreement.

     (d) No fractional shares of Parent Common Stock shall be issued in
connection with the Merger, and no certificates or scrip for any such fractional
shares shall be issued. Any holder of Company Common Stock who would otherwise
be entitled to receive a fraction of a share of Parent Common Stock (after
aggregating all fractional shares of Parent Common Stock issuable to such
holder) shall, in lieu of such fraction of a share and, upon surrender of such
holder's Company Stock Certificate(s) (as defined in Section 1.6) be paid in
cash the dollar amount (rounded to the nearest whole cent), without interest,
                                       A-6
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determined by multiplying such fraction by the closing sales price of a share of
Parent Common Stock as reported on the Nasdaq National Market on the second day
preceding the Closing Date.

     1.6  CLOSING OF THE COMPANY'S TRANSFER BOOKS.  At the Effective Time: (a)
all shares of Company Common Stock outstanding immediately prior to the
Effective Time shall automatically be canceled and retired and shall cease to
exist, and all holders of certificates representing shares of Company Common
Stock that were outstanding immediately prior to the Effective Time shall cease
to have any rights as stockholders of the Company; and (b) the stock transfer
books of the Company shall be closed with respect to all shares of Company
Common Stock outstanding immediately prior to the Effective Time. No further
transfer of any such shares of Company Common Stock shall be made on such stock
transfer books after the Effective Time. If, after the Effective Time, a valid
certificate previously representing any shares of Company Common Stock (a
"COMPANY STOCK CERTIFICATE") is presented to the Exchange Agent (as defined in
Section 1.7) or to the Surviving Corporation or Parent, such Company Stock
Certificate shall be canceled and shall be exchanged as provided in Section 1.7.

     1.7  EXCHANGE OF CERTIFICATES.

     (a) EquiServe, L.P. or such other reputable bank or trust company selected
by Parent prior to the Closing Date shall act as exchange agent in the Merger
(the "EXCHANGE AGENT"). As soon as practicable after the Effective Time, Parent
shall deposit with the Exchange Agent (i) certificates representing the shares
of Parent Common Stock issuable pursuant to this Section 1, and (ii) cash
sufficient to make payments in lieu of fractional shares in accordance with
Section 1.5(e). The shares of Parent Common Stock and cash amounts so deposited
with the Exchange Agent, together with any dividends or distributions received
by the Exchange Agent with respect to such shares, are referred to collectively
as the "EXCHANGE FUND."

     (b) As soon as reasonably practicable after the Effective Time, the
Exchange Agent will mail to the record holders of Company Stock Certificates (i)
a letter of transmittal in customary form and containing such provisions as
Parent and the Company may reasonably specify (including a provision confirming
that delivery of Company Stock Certificates shall be effected, and risk of loss
and title to Company Stock Certificates shall pass, only upon delivery of such
Company Stock Certificates to the Exchange Agent), and (ii) instructions for use
in effecting the surrender of Company Stock Certificates in exchange for
certificates representing Parent Common Stock. Upon surrender of a Company Stock
Certificate to the Exchange Agent for exchange, together with a duly executed
letter of transmittal and such other documents as may be reasonably required by
the Exchange Agent or Parent, (1) the holder of such Company Stock Certificate
that does not perfect its dissenters' rights, if any, shall be entitled to
receive in exchange therefor a certificate representing the number of whole
shares of Parent Common Stock that such holder has the right to receive pursuant
to the provisions of Section 1.5 (and cash in lieu of any fractional share of
Parent Common Stock), and (2) the Company Stock Certificate so surrendered shall
be canceled. In the event of a transfer of ownership of Company Common Stock
which is not registered in the transfer records of the Company, a certificate
representing the proper number of shares of Parent Common Stock may be issued to
a transferee if the Company Stock Certificate is presented to the Exchange
Agent, accompanied by all documents required to evidence and effect such
transfer and by evidence that any applicable stock transfer taxes have been
paid. Until surrendered as contemplated by this Section 1.7(b), each Company
Stock Certificate shall be deemed, from and after the Effective Time, to
represent only the right to receive shares of Parent Common Stock (and cash in
lieu of any fractional share of Parent Common Stock) as contemplated by Section
1. If any Company Stock Certificate shall have been lost, stolen or destroyed,
Parent may, in its discretion and as a condition precedent to the issuance of
any certificate representing Parent Common Stock, require the owner of such
lost, stolen or destroyed Company Stock Certificate to provide an appropriate
affidavit and to deliver a bond (in such sum as Parent may reasonably direct) as
indemnity against any claim that may be made against the Exchange Agent, Parent
or the Surviving Corporation with respect to such Company Stock Certificate.

     (c) No dividends or other distributions declared or made with respect to
Parent Common Stock with a record date after the Effective Time shall be paid to
the holder of any unsurrendered Company Stock

                                       A-7
<PAGE>   120

Certificate with respect to the shares of Parent Common Stock which such holder
has the right to receive upon surrender thereof until such holder surrenders
such Company Stock Certificate in accordance with this Section 1.7 (at which
time such holder shall be entitled, subject to the effect of applicable escheat
or similar laws, to receive all such dividends and distributions, without
interest).

     (d) Any portion of the Exchange Fund that remains undistributed to holders
of Company Stock Certificates as of the date 360 days after the date on which
the Merger becomes effective shall be delivered to Parent upon demand, and any
holders of Company Stock Certificates who have not theretofore surrendered their
Company Stock Certificates in accordance with this Section 1.7 shall thereafter
look only to Parent for satisfaction of their claims for Parent Common Stock,
cash in lieu of fractional shares of Parent Common Stock and any dividends or
distributions with respect to Parent Common Stock.

     (e) Each of the Exchange Agent, Parent and the Surviving Corporation shall
be entitled to deduct and withhold from any consideration payable or otherwise
deliverable pursuant to this Agreement to any holder or former holder of Company
Common Stock such amounts as may be required to be deducted or withheld
therefrom under the Code or any provision of state, local or foreign tax law or
under any other applicable Legal Requirement. To the extent such amounts are so
deducted or withheld, such amounts shall be treated for all purposes under this
Agreement as having been paid to the Person to whom such amounts would otherwise
have been paid.

     (f) Neither Parent nor the Surviving Corporation shall be liable to any
holder or former holder of Company Common Stock or to any other Person with
respect to any shares of Parent Common Stock (or dividends or distributions with
respect thereto), or for any cash amounts, delivered to any public official
pursuant to any applicable abandoned property law, escheat law or similar Legal
Requirement.

     1.8  RESERVED.

     1.9  DISSENTING SHARES.  Notwithstanding anything to the contrary contained
in this Agreement, any shares of capital stock of the Company that, as of the
Effective Time, are or may become "dissenting shares" within the meaning of
Section 1300(b) of the California General Corporation Law, if applicable, shall
not be converted into or represent the right to receive Parent Common Stock in
accordance with Section 1.5 (or cash in lieu of fractional shares in accordance
with Section 1.5(d)), and the holder or holders of such shares shall be entitled
only to such rights as may be granted to such holder or holders in the
California General Corporation Law; provided, however, that if the status of any
such shares as "dissenting shares" shall not be perfected, or if any such shares
shall lose their status as "dissenting shares," then, as of the later of the
Effective Time or the time of the failure to perfect such status or the loss of
such status, such shares shall automatically be converted into and shall
represent only the right to receive (upon the surrender of the certificate or
certificates representing such shares) Parent Common Stock in accordance with
Section 1.5 (and cash in lieu of fractional shares in accordance with Section
1.5(d)).

     1.10  RESERVED.

     1.11  TAX CONSEQUENCES.  For federal income tax purposes, the Merger is
intended to constitute a reorganization within the meaning of Section 368 of the
Code. The parties to this Agreement hereby adopt this Agreement as a "plan of
reorganization" within the meaning of Sections 1.368-2(g) and 1.368-3(a) of the
United States Treasury Regulations.

     1.12  ACCOUNTING CONSEQUENCES.  For financial reporting purposes, the
Merger is intended to be accounted for as a "pooling of interests."

     1.13  FURTHER ACTION.  If, at any time after the Effective Time, any
further action is determined by Parent to be necessary or desirable to carry out
the purposes of this Agreement or to vest the Surviving Corporation with full
right, title and possession of and to all rights and property of Merger Sub and
the Company, the officers and directors of the Surviving Corporation and Parent
shall be fully authorized (in the name of Merger Sub, in the name of the Company
and otherwise) to take such action.

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<PAGE>   121

SECTION 2.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to and for the benefit of Parent and
Merger as follows:

     2.1  DUE ORGANIZATION; SUBSIDIARIES; ETC.

     (a) The Company has no Subsidiaries, except for the Entities identified in
Part 2.1(a)(i) of the Company Disclosure Schedule; and neither the Company nor
any of the other Entities identified in Part 2.1(a)(i) of the Company Disclosure
Schedule owns any capital stock of, or any equity interest of any nature in, any
other Entity. (The Company and each of its Subsidiaries are referred to
collectively in this Agreement as the "ACQUIRED CORPORATIONS.") None of the
Acquired Corporations has agreed or is obligated to make, or is bound by any
Contract under which it may become obligated to make, any future investment in
or capital contribution to any other Entity. None of the Acquired Corporations
has, at any time, been a general partner of, or has otherwise been liable for
any of the debts or other obligations of, any general partnership, limited
partnership or other Entity.

     (b) Each of the Acquired Corporations is a corporation duly organized,
validly existing and in good standing under the laws of the jurisdiction of its
incorporation and has all necessary power and authority: (i) to conduct its
business in the manner in which its business is currently being conducted; (ii)
to own and use its assets in the manner in which its assets are currently owned
and used; and (iii) to perform its obligations under all Contracts by which it
is bound.

     (c) Each of the Acquired Corporations is qualified to do business as a
foreign corporation, and is in good standing, under the laws of all
jurisdictions where the nature of its business requires such qualification and
where the failure to be so qualified would reasonably be expected to have a
Material Adverse Effect on such Acquired Corporation.

     2.2  CERTIFICATE OF INCORPORATION AND BYLAWS.  The Company has delivered to
Parent accurate and complete copies of the certificate of incorporation, bylaws
and other charter and organizational documents of the respective Acquired
Corporations, including all amendments thereto.

     2.3  CAPITALIZATION, ETC.

     (a) The authorized capital stock of the Company consists of: 50,000,000
shares of Company Common Stock, of which 14,846,090 shares have been issued and
are outstanding as of June 6, 2000. The Company has not repurchased any shares
of its capital stock and does not hold any shares of its capital stock in its
treasury, except for the repurchase of Common Stock from employees or
consultants upon termination of their employment or consulting relationship with
the Company. All of the outstanding shares of Company Common Stock have been
duly authorized and validly issued, and are fully paid and nonassessable. As of
the date of this Agreement, there are no shares of Company Common Stock held by
any of the other Acquired Corporations. Except as set forth in Part 2.3(a)(i) of
the Company Disclosure Schedule: (i) none of the outstanding shares of Company
Common Stock is entitled or subject to any preemptive right, right of first
offer or any similar right created by the Company or imposed under applicable
law with respect to capital stock of the Company; (ii) none of the outstanding
shares of Company Common Stock is subject to any right of first refusal in favor
of the Company; and (iii) there is no Acquired Corporation Contract relating to
the voting or registration of, or restricting any Person from purchasing,
selling, pledging or otherwise disposing of (or granting any option or similar
right with respect to), any shares of Company Common Stock . None of the
Acquired Corporations is under any obligation, or is bound by any Contract
pursuant to which it may become obligated, to repurchase, redeem or otherwise
acquire any outstanding shares of Company Common Stock.

     (b) As of June 6, 2000: (i) 2,190,456 shares of Company Common Stock are
subject to issuance pursuant to outstanding options to purchase shares of
Company Common Stock; (ii) 230,701 shares of Company Common Stock are reserved
for future issuance pursuant to the Company's Employee Stock Purchase Plan (the
"ESPP"); and (iii) 65,653 shares of Company Common Stock are reserved for future
issuance pursuant to the Company Warrants. Part 2.3(b) of the Company Disclosure
Schedule sets forth the following information with respect to each Company
Option outstanding as of the date of this

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<PAGE>   122

Agreement: (i) the particular plan (if any) pursuant to which such Company
Option was granted; (ii) the name of the optionee; (iii) the number of shares of
Company Common Stock subject to such Company Option; (iv) the exercise price of
such Company Option; (v) the date on which such Company Option was granted; and
(vi) the applicable vesting schedules (which applicable vesting schedule may be
provided by means of a general description of the vesting schedules applicable
to outstanding Company Options), and the extent to which such Company Option is
vested and exercisable as of the date of this Agreement. The Company has
delivered to Parent accurate and complete copies of all stock option plans
pursuant to which the Company has ever granted stock options, the forms of all
stock option agreements evidencing such options and the actual Change of Control
Agreements with each employee of the Acquired Corporations who is a party to a
Change of Control Agreement with the Acquired Corporations (the "Change of
Control Agreements"). The Company has delivered to Parent accurate and complete
copies of the Company Warrants. The exercise price of each Company Warrant and
each Company Option is set forth in Part 2.3(b) of the Company Disclosure
Schedule.

     (c) Except as set forth in Section 2.3(b), as of June 6, 2000, there was
no: (i) outstanding subscription, option, call, warrant or right (whether or not
currently exercisable) to acquire any shares of the capital stock or other
securities of the Company; (ii) outstanding security, instrument or obligation
that is or may become convertible into or exchangeable for any shares of the
capital stock or other securities of the Company; (iii) stockholder rights plan
(or similar plan commonly referred to as a "poison pill") or Contract under
which the Company is or may become obligated to sell or otherwise issue any
shares of its capital stock or any other securities; or (iv) to the Knowledge of
the Company, condition or circumstance that may give rise to or provide a basis
for the assertion of a claim by any Person to the effect that such Person is
entitled to acquire or receive any shares of capital stock or other securities
of the Company.

     (d) All outstanding shares of Company Common Stock, all outstanding Company
Options, all outstanding Company Warrants and all outstanding shares of capital
stock of each Subsidiary of the Company have been issued and granted in
compliance with (i) all applicable securities laws and other applicable Legal
Requirements, and (ii) all material requirements set forth in applicable
Contracts.

     (e) All of the issued and outstanding shares of capital stock of each
Subsidiary identified in Part 2.1(a)(i) of the Company Disclosure Schedule have
been duly authorizeed, are validly issued, fully paid and nonassessable, and are
owned beneficially and of record by the Company, free and clear of any
Encumbrances, and there are no outstanding subscriptions, options, calls,
contracts, voting trusts, proxies or other commitments, understandings,
restrictions, arrangements, rights or warrants with respect to any such
Subsidiary's capital stock, including any right obligating any such Subsidiary
to issue, deliver or sell additional shares of its capital stock.

     (f) There has been no material charge to the Company's capitalization
between June 6, 2000 and the date hereof.

     2.4  SEC FILINGS; FINANCIAL STATEMENTS.

     (a) The Company has delivered or made available (including through the SEC
EDGAR system) to Parent accurate and complete copies of all registration
statements, proxy statements and other statements, reports, schedules, forms and
other documents filed by the Company with the SEC since January 1, 1999, and all
amendments thereto (the "COMPANY SEC DOCUMENTS"). Since January 1, 1999, all
statements, reports, schedules, forms and other documents required to have been
filed by the Company with the SEC have been so filed. As of the time it was
filed with the SEC (or, if amended or superseded by a filing prior to the date
of this Agreement, then on the date of such filing): (i) each of the Company SEC
Documents complied in all material respects with the applicable requirements of
the Securities Act or the Exchange Act (as the case may be); and (ii) none of
the Company SEC Documents contained any untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary in
order to make the statements therein, in the light of the circumstances under
which they were made, not misleading.

                                      A-10
<PAGE>   123

     (b) The consolidated financial statements (including any related notes)
contained in the Company SEC Documents: (i) complied as to form in all material
respects with the published rules and regulations of the SEC applicable thereto;
(ii) were prepared in accordance with generally accepted accounting principles
applied on a consistent basis throughout the periods covered (except as may be
indicated in the notes to such financial statements or, in the case of unaudited
statements, as permitted by Form 10-Q of the SEC, and except that the unaudited
financial statements may not contain footnotes and are subject to normal and
recurring year-end adjustments), and (iii) fairly present the consolidated
financial position of the Company and its subsidiaries as of the respective
dates thereof and the consolidated results of operations and cash flows of the
Company and its subsidiaries for the periods covered thereby.

     (c) The Company has delivered to Parent an unaudited consolidated balance
sheet of the Company and its subsidiaries as of March 31, 2000 (the "UNAUDITED
INTERIM BALANCE SHEET" and the "UNAUDITED INTERIM BALANCE SHEET DATE") as filed
by the Company in its Quarterly Report on Form 10-Q filed with the SEC, and the
related unaudited consolidated statement of operations and statement of cash
flows of the Company and its subsidiaries for the three months then ended. The
financial statements referred to in this Section 2.4(c): (i) were prepared in
accordance with generally accepted accounting principles applied on a basis
consistent with the basis on which the financial statements referred to in
Section 2.4(b) were prepared (except that such financial statements do not
contain footnotes and are subject to normal and recurring year-end adjustments),
and (ii) fairly present the consolidated financial position of the Company and
its subsidiaries as of the Unaudited Interim Balance Sheet Date and the
consolidated results of operations and cash flows of the Company and its
subsidiaries for the periods covered thereby.

     2.5  ABSENCE OF CHANGES.  Except as set forth in Part 2.5 of the Company
Disclosure Schedule, since March 31, 2000:

          (a) there has not been any material adverse change in the business,
     condition, assets, liabilities, operations or results of operations of the
     Acquired Corporations taken as a whole, and no event has occurred, in
     either case that would reasonably be expected to have a Material Adverse
     Effect on the Acquired Corporations;

          (b) there has not been any material loss, damage or destruction to, or
     any material interruption in the use of, any of the assets of any of the
     Acquired Corporations (whether or not covered by insurance) that has had or
     would reasonably be expected to have a Material Adverse Effect on the
     Acquired Corporations;

          (c) none of the Acquired Corporations has (i) declared, accrued, set
     aside or paid any dividend or made any other distribution in respect of any
     shares of capital stock, or (ii) repurchased, redeemed or otherwise
     reacquired any shares of capital stock or other securities other than
     capital stock acquired from employees or consultants upon the termination
     of their employment or consulting relationship with such Acquired
     Corporation after the date hereof;

          (d) none of the Acquired Corporations has sold, issued or granted, or
     authorized the issuance of, (i) any capital stock or other security (except
     for Company Common Stock issued upon the valid exercise of outstanding
     Company Options in accordance with the terms of the option agreement
     pursuant to which such Company Options are outstanding and shares of
     Company Common Stock to be issued (A) upon the valid exercise of Company
     Warrants, and (B) pursuant to the ESPP), (ii) any option, warrant or right
     to acquire any capital stock or any other security (except (A) for Company
     Options described in Part 2.3(b)(i) of the Company Disclosure Schedule, (B)
     subject to Section 4.2(b)(ii), for future grants of options under the
     Company's stock option plans, and (C) pursuant to the ESPP), or (iii) any
     instrument convertible into or exchangeable for any capital stock or other
     security;

          (e) the Company has not amended or waived any of its rights under, or
     permitted the acceleration of vesting under, (i) any provision of any of
     the Company's stock option plans, (ii) any provision of any agreement
     evidencing any outstanding Company Option, or (iii) any restricted stock
     purchase agreement;

                                      A-11
<PAGE>   124

          (f) there has been no amendment to the certificate of incorporation,
     bylaws or other charter or organizational documents of any of the Acquired
     Corporations, and none of the Acquired Corporations has effected or been a
     party to any merger, consolidation, amalgamation, share exchange, business
     combination, recapitalization, reclassification of shares, stock split,
     division or subdivision of shares, reverse stock split, consolidation of
     shares or similar transaction;

          (g) none of the Acquired Corporations has formed any Subsidiary or
     acquired any equity interest or other interest in any other Entity;

          (h) none of the Acquired Corporations has made any capital expenditure
     which, when added to all other capital expenditures made on behalf of the
     Acquired Corporations since March 31, 2000, exceeds $250,000 in the
     aggregate;

          (i) except in the ordinary course of business and consistent with past
     practices, none of the Acquired Corporations has (i) entered into or
     permitted any of the assets owned or used by it to become bound by any
     Material Contract (as defined in Section 2.10(a)), or (ii) amended or
     terminated, or waived any material right or remedy under, any Material
     Contract;

          (j) except in the ordinary course of business and consistent with past
     practices, none of the Acquired Corporations has (i) acquired, leased or
     licensed any material right or other material asset from any other Person,
     (ii) sold or otherwise disposed of, or leased or licensed, any material
     right or other material asset to any other Person, or (iii) waived or
     relinquished any right;

          (k) none of the Acquired Corporations has made any pledge of any of
     its assets or otherwise permitted any of its assets to become subject to
     any Encumbrance, except (i) for pledges of immaterial assets made in the
     ordinary course of business and consistent with past practices, (ii) for
     liens for current taxes which are not yet due and payable, and (iii) for
     easements, covenants, rights of way or other similar restrictions and
     imperfections of title which have not adversely affected in any material
     respect, and which are not reasonably expected to adversely affect in any
     material respect, the business or operations of any of the Acquired
     Corporations;

          (l) none of the Acquired Corporations has (i) lent money to any
     Person, except for advances to employees for business expenses or loans for
     relocation expenses, in each case, in the ordinary course of business and
     consistent with past practices, or (ii) incurred or guaranteed any
     indebtedness for borrowed money;

          (m) none of the Acquired Corporations has (i) established or adopted
     any Plan (as defined in Section 2.17(a)), or (ii) caused or permitted any
     Plan to be amended in any material respect;

          (n) none of the Acquired Corporations has paid any bonus or made any
     profit-sharing or similar payment to, or materially increased the amount of
     the wages, salary, commissions, fringe benefits or other compensation or
     remuneration payable to, any of its directors, officers or employees,
     except (i) pursuant to existing bonus plans and other Plans referred to in
     Part 2.17(a) of the Company Disclosure Schedule or new bonus or commission
     plans substantially consistent with the terms of existing bonus or
     commission plans; and (ii) for normal bonuses or increases in wages,
     salaries or commissions to non-officer employees in accordance with each
     Acquired Corporation's customary review process or otherwise in a manner
     consistent with each Acquired Corporation's past practices;

          (o) none of the Acquired Corporations has changed any of its methods
     of accounting or accounting practices;

          (p) no event has occurred, and no circumstance or condition exists,
     that has resulted in or that could reasonably be expected to result in the
     impairment of the capitalized software asset reflected in the Acquired
     Corporations' books and records;

          (q) none of the Acquired Corporations has made any material Tax
     election;

                                      A-12
<PAGE>   125

          (r) none of the Acquired Corporations has settled any Legal Proceeding
     involving payments by any of the Acquired Corporations in excess of $50,000
     or equitable relief against any of the Acquired Corporations;

          (s) none of the Acquired Corporations has entered into any material
     transaction or taken any other material action that has had, or would
     reasonably be expected to have, a Material Adverse Effect on the Acquired
     Corporations;

          (t) none of the Acquired Corporations has entered into any material
     transaction or taken any other material action outside the ordinary course
     of business or inconsistent with past practices; and

          (u) none of the Acquired Corporations has agreed or committed to take
     any of the actions referred to in the foregoing subsections of this Section
     2.5.

     2.6  TITLE TO ASSETS.  The Acquired Corporations own, and have good, valid
and marketable title to, all tangible personal property purported to be owned by
them, including: (i) all tangible personal property reflected on the Unaudited
Interim Balance Sheet (except for inventory sold or otherwise disposed of in the
ordinary course of business since the date of the Unaudited Interim Balance
Sheet); and (ii) all other assets reflected in the books and records of the
Acquired Corporations as being owned by the Acquired Corporations. Except as set
forth in Part 2.6 of the Company Disclosure Schedule, all of said items of
tangible personal property are owned by the Acquired Corporations free and clear
of any Encumbrances, except for (1) any lien for current taxes not yet due and
payable, (2) minor liens that have arisen in the ordinary course of business and
that do not (in any case or in the aggregate) materially detract from the value
of the tangible personal property subject thereto or materially impair the
operations of any of the Acquired Corporations, and (3) liens described in Part
2.6 of the Company Disclosure Schedule.

     2.7  RECEIVABLES; CUSTOMERS.  All existing accounts receivable of the
Acquired Corporations (including those accounts receivable reflected on the
Unaudited Interim Balance Sheet that have not yet been collected and those
accounts receivable that have arisen since March 31, 2000 and have not yet been
collected) represent valid obligations of customers of the Acquired Corporations
arising from bona fide transactions entered into in the ordinary course of
business. Between March 31, 2000 and the date of this Agreement, none of the
Acquired Corporations has written off as uncollectible, or established any
extraordinary reserve with respect to, any account receivable or other
indebtedness. The Company has not received any notice or other communication (in
writing or otherwise), and, to the Knowledge of the Company, has not received
any other information, indicating that (a) any customer is likely to cease
dealing with the Company, or (b) any customer is dissatisfied in any material
respect with the operation of any product, system or program currently
maintained, sold or licensed by any of the Acquired Corporations or with any
services performed by any of the Acquired Corporations since June 30, 1999.

     2.8  REAL PROPERTY; LEASEHOLD.  All material items of equipment and other
tangible assets owned by or leased to the Acquired Corporations are adequate for
the uses to which they are being put, are in good and safe condition and repair
(ordinary wear and tear excepted) and are adequate for the conduct of the
business of the Acquired Corporations in the manner in which such business is
currently being conducted. None of the Acquired Corporations own any real
property or any interest in real property, except for the leaseholds created
under the real property leases identified in Part 2.8 of the Company Disclosure
Schedule.

     2.9  INTELLECTUAL PROPERTY.

     (a) Part 2.9(a)(i) of the Company Disclosure Schedule sets forth, with
respect to each Proprietary Asset owned by the Acquired Corporations and
registered with any Governmental Body or for which an application has been filed
with any Governmental Body, (i) a brief description of such Proprietary Asset,
and (ii) the names of the jurisdictions covered by the applicable registration
or application. Part 2.9(a)(ii) of the Company Disclosure Schedule identifies
and provides a brief description of all other Proprietary Assets owned by the
Acquired Corporations that are material to the business of the Acquired
Corporations. Part 2.9(a)(iii) of the Company Disclosure Schedule identifies any
Acquired Company Contract containing any ongoing royalty or payment obligations
in excess of $10,000 with respect to, each
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<PAGE>   126

Proprietary Asset that is licensed or otherwise made available to the Acquired
Corporations by any Person and is material to the business of the Acquired
Corporations (except for any Proprietary Asset that is licensed to the Acquired
Corporations under any third party software license generally available to the
public), and identifies the Contract under which such Proprietary Asset is being
licensed or otherwise made available to such Acquired Corporation. The Acquired
Corporations have good, valid and marketable title to all of the Acquired
Corporation Proprietary Assets identified in Parts 2.9(a)(i)and 2.9(a)(ii) of
the Company Disclosure Schedule, free and clear of all Encumbrances, except for
(i) any lien for current taxes not yet due and payable, and (ii) minor liens
that have arisen in the ordinary course of business and that do not
(individually or in the aggregate) materially detract from the value of the
assets subject thereto or materially impair the operations of either of the
Acquired Corporations. The Acquired Corporations have a valid right to use,
license and otherwise exploit all Proprietary Assets identified in Part
2.9(a)(iii) of the Company Disclosure Schedule. None of the Acquired
Corporations has developed jointly with any other Person any Acquired
Corporation Proprietary Asset that is material to the business of the Acquired
Corporations with respect to which such other Person has any rights. Except as
set forth in Part 2.9(a)(v) of the Company Disclosure Schedule, there is no
Acquired Corporation Contract (with the exception of end user license agreements
in the form previously delivered by the Company to Parent) pursuant to which any
Person has any right (whether or not currently exercisable) to use, license or
otherwise exploit any Acquired Corporation Proprietary Asset.

     (b) The Acquired Corporations have taken reasonable measures and
precautions to protect and maintain the confidentiality, secrecy and value of
all material Acquired Corporation Proprietary Assets (except Acquired
Corporation Proprietary Assets whose value would be unimpaired by disclosure).
Without limiting the generality of the foregoing, (i) all current and former
employees of the Acquired Corporations who are or were involved in, or who have
contributed to, the creation or development of any material Acquired Corporation
Proprietary Asset have executed and delivered to the Acquired Corporations an
agreement that is substantially identical to the form of Confidential
Information and Invention Assignment Agreement previously delivered by the
Company to Parent, and (ii) all current and former consultants and independent
contractors to the Acquired Corporations who are or were involved in, or who
have contributed to, the creation or development of any material Acquired
Corporation Proprietary Asset have executed and delivered to the Company an
agreement that is substantially identical to the form of Consultant Confidential
Information and Invention Assignment Agreement previously delivered to Parent.
No current or former employee, officer, director, stockholder, consultant or
independent contractor has any right, claim or interest in or with respect to
any Acquired Corporation Proprietary Asset.

     (c) To the Knowledge of the Company: (i) all patents, trademarks, service
marks and copyrights held by any of the Acquired Corporations are valid,
enforceable and subsisting; (ii) none of the Acquired Corporation Proprietary
Assets and no Proprietary Asset that has been substantially developed by any of
the Acquired Corporations (either by itself or with any other Person) infringes,
misappropriates or conflicts with any Proprietary Asset owned or used by any
other Person; (iii) none of the products that are or have been designed,
created, substantially developed, assembled, manufactured or sold by any of the
Acquired Corporations is infringing, misappropriating or making any unlawful or
unauthorized use of any Proprietary Asset owned or used by any other Person, and
none of such products has at any time infringed, misappropriated or made any
unlawful or unauthorized use of, and none of the Acquired Corporations has
received any notice or other communication (in writing or otherwise) of any
actual, alleged, possible or potential infringement, misappropriation or
unlawful or unauthorized use of, any Proprietary Asset owned or used by any
other Person; (iv) no other Person is infringing, misappropriating or making any
unlawful or unauthorized use of, and no Proprietary Asset owned or used by any
other Person infringes or conflicts with, any material Acquired Corporation
Proprietary Asset.

     (d) The Acquired Corporation Proprietary Assets constitute all the
Proprietary Assets necessary to enable the Acquired Corporations to conduct
their business in the manner in which such business has been and is being
conducted. None of the Acquired Corporations has (i) licensed any of the
material Acquired Corporation Proprietary Assets to any Person on an exclusive
basis, or (ii) entered into any covenant not

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<PAGE>   127

to compete or Contract limiting its ability to exploit fully any material
Acquired Corporation Proprietary Assets or to transact business in any market or
geographical area or with any Person.

     (e) Except as set forth in Part 2.9(e)(i) of the Company Disclosure
Schedule, none of the Acquired Corporations has disclosed or delivered to any
Person, or permitted the disclosure or delivery to any escrow agent or other
Person, of any Acquired Corporation Source Code. No event has occurred, and no
circumstance or condition exists, that (with or without notice or lapse of time)
will, or could reasonably be expected to, result in the disclosure or delivery
to any Person of any Acquired Corporation Source Code. There is no contract
pursuant to which the Company has deposited or is required to deposit with an
escrowholder or any other Person any Acquired Corporation Source Code, and the
execution of this Agreement or the consummation of any of the transactions
contemplated hereby will not result in the release or disclosure of any Acquired
Corporation Source Code.

     (f) Except with respect to demonstration or trial copies, no product,
system, program or software module (i) designed or developed or (ii) to the
Knowledge of Company, sold, licensed or otherwise made available by any of the
Acquired Corporations to any Person contains any "back door," "time bomb,"
"Trojan horse," "worm," "drop dead device," "virus" or other software routines
or hardware components designed to permit unauthorized access or to disable or
erase software, hardware or data without the consent of the user.

     2.10  CONTRACTS.

     (a) Part 2.10 of the Company Disclosure Schedule identifies each Acquired
Corporation Contract that constitutes a "Material Contract" as of the date of
this Agreement. (For purposes of this Agreement, each of the following Contracts
(to the extent that any of the Acquired Corporations has (or may have) any
liability or obligation thereunder or with respect thereto after the date of
this Agreement) shall be deemed to constitute a "MATERIAL CONTRACT":

          (i) any Contract relating to the employment of, or the performance of
     services by, any employee or consultant (other than any offer letter
     provided to any employee of any of the Acquired Corporations which provides
     for "at will" employment); any Contract pursuant to which any of the
     Acquired Corporations is or may become obligated to make any severance,
     termination or similar payment to any current or former employee or
     director; and any Contract pursuant to which any of the Acquired
     Corporations is or may become obligated to make any bonus or similar
     payment (other than payments in respect of salary) in excess of $25,000 to
     any current or former employee or director;

          (ii) any Contract, with the exception of standard Contracts which
     contain warranties with a term of less than eighteen months, (A) with any
     customer of any of the Acquired Corporations for standard purchase orders;
     or (B) with respect to the distribution or marketing of any product of any
     of the Acquired Corporations;

          (iii) any Contract pursuant to which any third party licenses to any
     of the Acquired Corporations (or otherwise permits any of the Acquired
     Corporations to use) any Intellectual Property that is incorporated as a
     material component of any product of any of the Acquired Corporations or is
     otherwise material to the business of any of the Acquired Corporations
     (other than "off the shelf" or other software which is widely available
     through regular commercial distribution channels on standard terms and
     conditions, as modified for the Acquired Corporations' operations);

          (iv) any Contract which provides for indemnification of any officer,
     director, employee or agent;

          (v) any Contract imposing any restriction on the right or ability of
     any Acquired Corporation (A) to compete with any other Person, (B) to
     acquire any material product or other asset or any services from any other
     Person, (C) to solicit, hire or retain any Person as an employee,
     consultant or independent contractor, (D) to develop, sell, supply,
     distribute, offer, support or service any product or any technology or
     other asset to or for any other Person, (E) to perform services for any
     other Person, or (F) to transact business or deal in any other manner with
     any other Person;

                                      A-15
<PAGE>   128

          (vi) any Contract (A) relating to the acquisition, issuance, voting,
     registration, sale or transfer of any securities, other than pursuant to
     Company Options or the ESPP, (B) providing any Person with any preemptive
     right, right of participation, right of maintenance or any similar right
     with respect to any securities, or (C) providing any of the Acquired
     Corporations with any right of first refusal with respect to, or right to
     purchase or otherwise acquire, any securities;

          (vii) any Contract incorporating or relating to any guaranty, any
     warranty or any indemnity or similar obligation, except for Contracts
     entered into in the ordinary course of business;

          (viii) any Contract relating to any currency hedging;

          (ix) any Contract imposing any material confidentiality obligation on
     any of the Acquired Corporations other than nondisclosure agreements or
     customer contracts entered into in the ordinary course of business;

          (x) any Contract to which any Governmental Body is a party; and any
     other Contract directly or indirectly benefiting any Governmental Body
     (including any subcontract or other Contract between any Acquired
     Corporation and any contractor or subcontractor to any Governmental Body),
     except for Contracts entered into in the ordinary course of business for
     the license, maintenance or service of products;

          (xi) any Contract with obligations in excess of $50,000 that has a
     term of more than 60 days and that may not be terminated by an Acquired
     Corporation (without penalty) within 60 days after the delivery of a
     termination notice by such Acquired Corporation;

          (xii) any Contract that contemplates or involves the payment or
     delivery of cash or other consideration in an amount or having a value in
     excess of $50,000 in the aggregate, or contemplates or involves the
     performance of services having a value in excess of $100,000 in the
     aggregate;

          (xiii) any Contract requiring that any of the Acquired Corporations
     give any notice or provide any information to any Person prior to
     considering or accepting any Acquisition Proposal or similar proposal, or
     prior to entering into any discussions, agreement, arrangement or
     understanding relating to any Acquisition Transaction or similar
     transaction;

          (xiv) any Contract that (A) contemplates or involves the payment or
     delivery of cash or other consideration by any of the Acquired Corporations
     in an amount or having a value in excess of $100,000 in the aggregate, (B)
     contemplates or involves the payment or delivery of cash or other
     consideration to any of the Acquired Corporations in an amount or having a
     value in excess of $250,000 in the aggregate, or (C) contemplates or
     involves the performance of services by any of the Acquired Corporations
     having a value in excess of $250,000 in the aggregate; and

          (xv) any Contract (not otherwise identified in clauses "(i)" through
     "(xiv)" of this sentence), if a breach of such Contract could reasonably be
     expected to have a Material Adverse Effect on the Acquired Corporations.

     (b) The Company has delivered or made available to Parent and to Cooley
Godward llp an accurate and complete copy of (i) each Material Contract; (ii)
each Acquired Corporation Contract (to the extent that any of the Acquired
Corporations has (or may have) any liability or obligation thereunder or with
respect thereto after the date of this Agreement) of the type referred to in
Section 2.9 ; (iii) each Acquired Corporation Contract (to the extent that any
of the Acquired Corporations has (or may have) any liability or obligation
thereunder or with respect thereto after the date of this Agreement) with any
customer of any of the Acquired Corporations; and (v) each other Acquired
Corporation Contract (not otherwise identified in clauses "(i)" through "(iv)"
of this sentence) that is material to the business of any of the Acquired
Corporations.

     (c) Each Acquired Corporation Contract is valid and in full force and
effect, and is enforceable in accordance with its terms, subject to (i) laws of
general application relating to bankruptcy, insolvency and

                                      A-16
<PAGE>   129

the relief of debtors, and (ii) applicable rules of law governing specific
performance, injunctive relief and other equitable remedies.

     (d) (i) none of the Acquired Corporations has violated or breached, or
committed any default under, any Acquired Corporation Contract, except for
violations, breaches and defaults that have not had and would not reasonably be
expected to have a Material Adverse Effect on the Acquired Corporations; and, to
the Knowledge of the Company, no other Person has violated or breached, or
committed any default under, any Acquired Corporation Contract, except for
violations, breaches or defaults that have not had and would not reasonably be
expected to have a Material Adverse Effect on the Acquired Corporations; (ii) to
the Knowledge of the Company, no event has occurred, and no circumstance or
condition exists, that (with or without notice or lapse of time) will, or would
reasonably be expected to, (A) result in a violation or breach of any of the
provisions of any Acquired Corporation Contract, (B) give any Person the right
to declare a default or exercise any remedy under any Acquired Corporation
Contract, (C) give any Person the right to receive or require a rebate,
chargeback or penalty under any Acquired Corporation Contract, (D) give any
Person the right to accelerate the maturity or performance of any Acquired
Corporation Contract, or (E) give any Person the right to cancel, terminate or
modify any Acquired Corporation Contract, except in each such case for defaults,
acceleration rights, termination rights and other rights that have not had and
would not reasonably be expected to have a Material Adverse Effect on the
Acquired Corporations; and (iii) since June 30, 1999, none of the Acquired
Corporations has received any notice or other communication regarding any actual
or possible violation or breach of, or default under, any Acquired Corporation
Contract, except in each such case for defaults, acceleration rights,
termination rights and other rights that have not had and would not reasonably
be expected to have a Material Adverse Effect on the Acquired Corporations.

     2.11  SALE OF PRODUCTS; PERFORMANCE OF SERVICES

     (a) Assuming the products, systems, programs and software modules of the
Acquired Corporations are used in the manner in which they are intended to be
used (including platform specifications and other product literature) and were
maintained in accordance with the Acquired Corporations' regular maintenance
program, none of the products, systems, programs or software modules of any of
the Acquired Corporations would reasonably be expected to (A) disrupt, disable,
harm or otherwise impede in any material respect the operation of a computer
program or a computer system or the equipment on which such code resides, or (B)
damage or destroy any data or files residing on a computer or computer system
without the consent of the user of such computer or computer system.

     (b) Except as set forth in Part 2.11(b) of the Company Disclosure Schedule,
all installation services, programming services, repair services, maintenance
services, support services, training services, upgrade services and other
services that have been performed by the Acquired Corporations were performed
properly and in substantial conformity with the terms and requirements of all
applicable warranties and other Contracts and with all applicable Legal
Requirements.

     (c) Except as set forth in Part 2.11(c) of the Company Disclosure Schedule,
since June 30, 1999, no customer or other Person has asserted or threatened to
assert any claim against any of the Acquired Corporations (i) under or based
upon any warranty provided by or on behalf of any of the Acquired Corporations,
(ii) under or based upon any other warranty relating to any product, system,
program, Proprietary Asset or other asset designed, developed, manufactured,
assembled, sold, installed, repaired, licensed or otherwise made available by
any of the Acquired Corporations, or (iii) based upon any services performed by
any of the Acquired Corporations.

     2.12  LIABILITIES.  None of the Acquired Corporations has any accrued,
contingent or other liabilities of any nature, either matured or unmatured,
except for: (a) liabilities identified as such in the "liabilities" column of
the Unaudited Interim Balance Sheet; (b) normal and recurring current
liabilities that have been incurred by the Acquired Corporations since March 31,
2000 in the ordinary course of business and consistent with past practices; (c)
liabilities described in Part 2.12 of the Company Disclosure Schedule; and (d)
liabilities that have not had, and would not reasonably be expected to have, a
Material Adverse Effect on the Acquired Corporations.
                                      A-17
<PAGE>   130

     2.13  COMPLIANCE WITH LEGAL REQUIREMENTS.  Except as set forth in Part 2.13
of the Company Disclosure Schedule, each of the Acquired Corporations is, and
has at all times since June 30, 1999 been, in compliance with all applicable
Legal Requirements, except where the failure to comply with such Legal
Requirements has not had and would not reasonably be expected to have a Material
Adverse Effect on the Acquired Corporations. Except as set forth in Part 2.13 of
the Company Disclosure Schedule, since June 30, 1999, none of the Acquired
Corporations has received any notice or other communication from any
Governmental Body or other Person regarding any actual or possible violation of,
or failure to comply with, any Legal Requirement.

     2.14  CERTAIN BUSINESS PRACTICES.  None of the Acquired Corporations nor,
to the Knowledge of the Company, any director, officer, agent or employee of any
of the Acquired Corporations has (i) used any funds for unlawful contributions,
gifts, entertainment or other unlawful expenses relating to political activity,
(ii) made any unlawful payment to foreign or domestic government officials or
employees or to foreign or domestic political parties or campaigns or violated
any provision of the Foreign Corrupt Practices Act of 1977, as amended, or (iii)
made any other unlawful payment.

     2.15  GOVERNMENTAL AUTHORIZATIONS.  The Acquired Corporations hold all
Governmental Authorizations necessary to enable the Acquired Corporations to
conduct their respective businesses in the manner in which such businesses are
currently being conducted, except where the failure to hold such Governmental
Authorizations has not had and would not reasonably be expected to have a
Material Adverse Effect on the Acquired Corporations. Each Acquired Corporation
is, and at all times since June 30, 1999 has been, in substantial compliance
with the terms and requirements of such Governmental Authorizations, except
where the failure to be in compliance with the terms and requirements of such
Governmental Authorizations has not had and would not reasonably be expected to
have a Material Adverse Effect on the Acquired Corporations. Since June 30,
1999, none of the Acquired Corporations has received any notice or other
communication from any Governmental Body regarding (a) any actual or possible
violation of or failure to comply with any term or requirement of any material
Governmental Authorization, or (b) any actual or possible revocation,
withdrawal, suspension, cancellation, termination or modification of any
material Governmental Authorization.

     2.16  TAX MATTERS.

     (a) Each material Tax Return required to be filed by or on behalf of the
respective Acquired Corporations with any Governmental Body on or before the
Closing Date (the "ACQUIRED CORPORATION RETURNS") (i) has been or will be filed
on or before the applicable due date, as extended by such Governmental Body, and
(ii) has been, or will be when filed, prepared in all material respects in
compliance with all applicable Legal Requirements. All amounts shown on the
Acquired Corporation Returns to be due on or before the Closing Date have been
or will be paid on or before the Closing Date.

     (b) The Unaudited Interim Balance Sheet fully accrues all actual and
contingent liabilities for Taxes with respect to all periods through March 31,
2000 in accordance with generally accepted accounting principles other than
amounts which in the aggregate would not have a Material Adverse Effect if
determined to be due. Each Acquired Corporation will establish, in the ordinary
course of business and consistent with its past practices, reserves adequate for
the payment of all Taxes for the period from Unaudited Interim Balance Sheet
Date through the Closing Date, and will disclose the amount of such reserves to
Parent no later than 10 business days prior to the Closing Date. Since December
31, 1998, none of the Acquired Corporations has incurred any liability for any
Tax other than in the ordinary course of its business.

     (c) No Acquired Corporation Return has been examined or audited by any
Governmental Body. No extension or waiver of the limitation period applicable to
any of the Acquired Corporation Returns has been granted (by any Acquired
Corporation or any other Person) that has not expired, and no such extension or
waiver has been requested from any Acquired Corporation, other than extensions
or waivers that are no longer in effect.

                                      A-18
<PAGE>   131

     (d) No claim or Legal Proceeding is pending or, to the Knowledge of the
Company, has been threatened against or with respect to any Acquired Corporation
in respect of any material Tax. There are no unsatisfied liabilities for
material Taxes (including liabilities for interest, additions to tax and
penalties thereon and related expenses) with respect to any notice of deficiency
or similar document received by any Acquired Corporation with respect to any
material Tax (other than liabilities for Taxes asserted under any such notice of
deficiency or similar document which are being contested in good faith by the
Acquired Corporations and with respect to which adequate reserves for payment
have been established on the Unaudited Interim Balance Sheet). There are no
liens for material Taxes upon any of the assets of any of the Acquired
Corporations except liens for current Taxes not yet due and payable. None of the
Acquired Corporations has entered into or become bound by any agreement or
consent pursuant to Section 341(f) of the Code (or any comparable provision of
state or foreign Tax laws). None of the Acquired Corporations has been, and none
of the Acquired Corporations will be, required to include any adjustment in
taxable income for any tax period (or portion thereof) pursuant to Section 481
or 263A of the Code (or any comparable provision under state or foreign Tax
laws) as a result of transactions or events occurring, or accounting methods
employed, prior to the Closing.

     (e) Except as set forth in Part 2.16(e) of the Company Disclosure Schedule,
there is no agreement, plan, arrangement or other Contract covering any employee
or independent contractor or former employee or independent contractor of any of
the Acquired Corporations that, considered individually or considered
collectively with any other such Contracts, will, or could reasonably be
expected to, give rise directly or indirectly to the payment of any amount that
would not be deductible pursuant to Section 280G or Section 162(m) of the Code
(or any comparable provision under state or foreign Tax laws). None of the
Acquired Corporations is, or has ever been, a party to or bound by any tax
indemnity agreement, tax sharing agreement, tax allocation agreement or similar
Contract. The Company has not entered into any Contract pursuant to which it has
agreed to reimburse or "gross-up" any individual with respect to golden-
parachute excise taxes.

     2.17  EMPLOYEE AND LABOR MATTERS; BENEFIT PLANS.

     (a) Part 2.17(a) of the Company Disclosure Schedule identifies each salary,
bonus, material deferred compensation, material incentive compensation, stock
purchase, stock option, severance pay, termination pay, hospitalization,
medical, insurance, supplemental unemployment benefits, profit-sharing, pension
or retirement plan, program or material agreement, whether or not in writing,
maintained, sponsored, contributed to or required to be contributed to by any of
the Acquired Corporations for the benefit of any current or former employee of
any of the Acquired Corporations or pursuant to which any of the Parent, Merger
Sub or any of the Acquired Corporations could incur liability (including any
such plan, program or material agreement maintained, sponsored, contributed to
or required to be contributed to by any of the Acquired Corporations for the
benefit of any current or former employee located in the United States, United
Kingdom, France or Germany). (All plans, programs and material agreements of the
type referred to in the prior sentence are referred to in this Agreement as the
"PLANS.")

     (b) Except as set forth in Part 2.17(a) of the Company Disclosure Schedule,
none of the Acquired Corporations maintains, sponsors or contributes to, and
none of the Acquired Corporations has since January 1, 1999 maintained,
sponsored or contributed to, any employee pension benefit plan (as defined in
Section 3(2) of the Employee Retirement Income Security Act of 1974, as amended
("ERISA")) or any similar pension benefit plan under the laws of any foreign
jurisdiction (including the United Kingdom, France and Germany), whether or not
excluded from coverage under specific Titles or Subtitles of ERISA), for the
benefit of any current or former employee or director of any of the Acquired
Corporations (a "PENSION PLAN").

     (c) Except as set forth in Part 2.17(a) or Part 2.17(c) of the Company
Disclosure Schedule, none of the Acquired Corporations maintains, sponsors or
contributes to any: (i) employee welfare benefit plan (as defined in Section
3(1) of ERISA) or any similar welfare benefit plan under the laws of any foreign
jurisdiction (including the United Kingdom, France and Germany), whether or not
excluded from coverage under specific Titles or Merger Subtitles of ERISA, for
the benefit of any current or former

                                      A-19
<PAGE>   132

employee or director of any of the Acquired Corporations (a "WELFARE PLAN"), or
(ii) self-funded medical, dental or other similar Plan. None of the Plans
identified in the Company Disclosure Schedule is a multiemployer plan (within
the meaning of Section 3(37) of ERISA).

     (d) With respect to each Plan, the Company has delivered to Parent: (i) an
accurate and complete copy of such Plan (including all amendments thereto); (ii)
an accurate and complete copy of the annual report, if required under ERISA,
with respect to such Plan for each of the last two years; (iii) an accurate and
complete copy of the most recent summary plan description, together with each
summary of material modifications, if required under ERISA, with respect to such
Plan, (iv) if such Plan is funded through a trust or any third party funding
vehicle, an accurate and complete copy of the trust or other funding agreement
(including all amendments thereto) and accurate and complete copies the most
recent financial statements thereof; (v) accurate and complete copies of all
Contracts relating to such Plan, including service provider agreements,
insurance contracts, minimum premium contracts, stop-loss agreements, investment
management agreements, subscription and participation agreements and
recordkeeping agreements; and (vi) an accurate and complete copy of the most
recent determination letter received from the Internal Revenue Service with
respect to such Plan (if such Plan is intended to be qualified under Section
401(a) of the Code).

     (e) None of the Acquired Corporations is or has ever been required to be
treated as a single employer with any other Person under Section 4001(b)(1) of
ERISA or Section 414(b), (c), (m) or (o) of the Code. None of the Acquired
Corporations has ever been a member of an "affiliated service group" within the
meaning of Section 414(m) of the Code. None of the Acquired Corporations has
ever made a complete or partial withdrawal from a multiemployer plan, as such
term is defined in Section 3(37) of ERISA, resulting in "withdrawal liability,"
as such term is defined in Section 4201 of ERISA (without regard to any
subsequent reduction or waiver of such liability under either Section 4207 or
4208 of ERISA).

     (f) None of the Acquired Corporations has any plan or commitment to create
any Plan or to modify or change any existing Plan (other than to comply with
applicable law) in a manner that would affect any current or former employee or
director of any of the Acquired Corporations.

     (g) No Plan provides death, medical or health benefits (whether or not
insured) with respect to any current or former employee or director of any of
the Acquired Corporations after termination of service of such employee or
director (other than (i) benefit coverage mandated by applicable law, including
coverage provided pursuant to Section 4980B of the Code, (ii) deferred
compensation benefits accrued as liabilities on the Unaudited Interim Balance
Sheet, and (iii) benefits the full cost of which are borne by current or former
employees or directors of any of the Acquired Corporations (or their
beneficiaries)).

     (h) With respect to any Plan constituting a group health plan within the
meaning of Section 4980B(g)(2) of the Code, to the Knowledge of the Company, the
provisions of Section 4980B of the Code ("COBRA") have been complied with in all
material respects.

     (i) To the Knowledge of the Company, each of the Plans has been operated
and administered in all material respects in accordance with applicable Legal
Requirements, including without limitation ERISA and the Code, each Legal
Requirement pursuant to which any of the Acquired Corporations is required to
establish any reserve or make any contribution for the benefit of any current or
former employee located in the United States, United Kingdom, France, Germany or
any other foreign jurisdiction.

     (j) Each of the Plans intended to be qualified under Section 401(a) of the
Code has received a favorable determination letter from the Internal Revenue
Service or the deadline for applying to the Internal Revenue Service for such a
determination letter has yet to expire, and the Company is not aware of any
reason why any such determination letter could be revoked or should not be
issued.

     (k) Except pursuant to the Change of Control Agreements or as set forth in
Part 2.17(k) of the Company Disclosure Schedule, neither the execution, delivery
or performance of this Agreement, nor the consummation of the Merger or any of
the other transactions contemplated by this Agreement, will result in any bonus,
golden parachute, severance or other payment or obligation to any current or
former
                                      A-20
<PAGE>   133

employee or director of any of the Acquired Corporations (whether or not under
any Plan), materially increase the benefits payable or provided under any Plan,
or result in any acceleration of the time of payment, provision or vesting of
any such benefits. Without limiting the generality of the foregoing (and except
pursuant to the Change of Control Agreements or as set forth in Part 2.17(k) of
the Company Disclosure Schedule), the consummation of the Merger will not result
in the acceleration of vesting of any unvested Company Options.

     (l) Part 2.17(l) of the Company Disclosure Schedule identifies each
employee of each of the Acquired Corporations as of the date of this Agreement,
and correctly reflects, in all material respects, the current salary and any
other compensation payable to such employee (including compensation payable
pursuant to bonus, deferred compensation or commission arrangements), such
employee's employer, years employed and position. None of the Acquired
Corporations is a party to any collective bargaining contract or other Contract
with a labor union involving any of its employees. All of the employees of the
Acquired Corporations are "at will" employees.

     (m) There is no employee of any of the Acquired Corporations who is not
fully available to perform work because of disability or other leave and sets
forth the basis of such disability (to the extent known by the Company) or leave
and the anticipated date of such employee's return to full service.

     (n) To the Knowledge of the Company, each of the Acquired Corporations is
in compliance in all material respects with all applicable Legal Requirements
and Contracts relating to employment, employment practices, wages, bonuses and
terms and conditions of employment, including employee compensation matters.

     (o) Each of the Acquired Corporations has good labor relations, and the
Company has no Knowledge of any facts indicating that (i) the consummation of
the Merger or any of the other transactions contemplated by this Agreement will
have a material adverse effect on the labor relations of any of the Acquired
Corporations, or (ii) any of the employees of any of the Acquired Corporations
intends to terminate his or her employment with such Acquired Corporation.

     2.18  ENVIRONMENTAL MATTERS.  Each of the Acquired Corporations is in
compliance in all material respects with all applicable Environmental Laws,
which compliance includes the possession by each of the Acquired Corporations of
all permits and other Governmental Authorizations required of them under
applicable Environmental Laws, and compliance in all material respects with the
terms and conditions thereof. To the Knowledge of the Company, since June 30,
1999, none of the Acquired Corporations has received any notice or other
communication (in writing or otherwise), whether from a Governmental Body,
citizens group, employee or otherwise, that alleges that any of the Acquired
Corporations is not in compliance in all material respects with any
Environmental Law. To the Knowledge of the Company, no current or prior owner of
any property leased by any of the Acquired Corporations has received any notice
or other communication (in writing or otherwise), whether from a Government
Body, citizens group, employee or otherwise, that alleges that such current or
prior owner or any of the Acquired Corporations is not in compliance in all
material respects with any Environmental Law. To the Knowledge of the Company
(a) all property that is leased to or used by the Acquired Corporations, and all
surface water, groundwater and soil associated with such property is free of any
material environmental contamination of any nature, (b) none of the property
leased to or used by any of the Acquired Corporations presently contains any
underground storage tanks, asbestos, equipment using PCBs or underground
injection wells, and (c) none of the property leased to or used by any of the
Acquired Corporations presently contains any septic tanks in which process
wastewater or any Materials of Environmental Concern have been disposed. To the
Knowledge of the Company, no Acquired Corporation has sent or transported, or
arranged to send or transport, any Materials of Environmental Concern to a site
that, pursuant to any applicable Environmental Law (i) has been placed on the
"National Priorities List" of hazardous waste sites or any similar state list,
(ii) is otherwise designated or identified as a potential site for remediation,
cleanup, closure or other environmental remedial activity, or (iii) is subject
to a Legal Requirement to take "removal" or "remedial" action as detailed in any
applicable Environmental Law or to make payment for the cost of cleaning up the
site. (For purposes of this Section 2.18: (A) "ENVIRONMENTAL LAW" means any

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federal, state, local or foreign Legal Requirement relating to pollution or
protection of human health from Materials of Environmental Concern or protection
of the environment (including ambient air, surface water, ground water, land
surface or subsurface strata), including any law or regulation relating to
emissions, discharges, releases or threatened releases of Materials of
Environmental Concern, or otherwise relating to the manufacture, processing,
distribution, use, treatment, storage, disposal, transport or handling of
Materials of Environmental Concern; and (B) "MATERIALS OF ENVIRONMENTAL CONCERN"
means chemicals, pollutants, contaminants, wastes, toxic substances, petroleum
and petroleum products and any other substance that is regulated by any
Governmental Body with respect to the environment.)

     2.19  INSURANCE.  The Company has delivered to Parent certificates of
insurance and summaries of all material insurance policies and all material self
insurance programs and arrangements relating to the business, assets and
operations of the Acquired Corporations. Each of such insurance policies is in
full force and effect. Since June 30, 1999, none of the Acquired Corporations
has received any notice or other communication regarding any actual or possible
(a) cancellation or invalidation of any insurance policy, (b) refusal of any
coverage or rejection of any material claim under any insurance policy, or (c)
material adjustment in the amount of the premiums payable with respect to any
insurance policy. There is no pending workers' compensation or other claim under
or based upon any insurance policy of any of the Acquired Corporations.

     2.20  TRANSACTIONS WITH AFFILIATES.  Except as set forth in the Company SEC
Reports, since the date of the Company's last proxy statement filed with the
SEC, no event has occurred that would be required to be reported by the Company
pursuant to Item 404 of Regulation S-K promulgated by the SEC. Part 2.20 of the
Company Disclosure Schedule identifies each person who is (or who may be deemed
to be) an "affiliate" (as that term is used in Rule 145 under the Securities
Act) of the Company as of the date of this Agreement.

     2.21  LEGAL PROCEEDINGS; ORDERS.

     (a) There is no pending Legal Proceeding, and (to the Knowledge of the
Company) no Person has threatened to commence any Legal Proceeding: (i) that
involves any of the Acquired Corporations or any of the assets owned or used by
any of the Acquired Corporations and that, if adversely determined, would
reasonably be expected to have a Material Adverse Effect on the Acquired
Corporations; or (ii) that challenges, or that may have the effect of
preventing, delaying, making illegal or otherwise interfering with, the Merger
or any of the other transactions contemplated by this Agreement. To the
Knowledge of the Company, no event has occurred, and no claim, dispute or other
condition or circumstance exists, that would reasonably be expected to, give
rise to or serve as a basis for the commencement of any such Legal Proceeding.

     (b) There is no material order, writ, injunction, judgment or decree to
which any of the Acquired Corporations, or any of the assets owned or used by
any of the Acquired Corporations, is subject. To the Knowledge of the Company,
no officer or key employee of any of the Acquired Corporations is subject to any
order, writ, injunction, judgment or decree that prohibits such officer or other
key employee from engaging in or continuing any conduct, activity or practice
relating to the business of any of the Acquired Corporations.

     2.22  AUTHORITY; INAPPLICABILITY OF ANTI-TAKEOVER STATUTES; BINDING NATURE
OF AGREEMENT.  The Company has the absolute and unrestricted right, power and
authority to enter into and to perform its obligations under this Agreement. The
board of directors of the Company (at a meeting duly called and held on June 7,
2000) has (a) determined (pursuant to a unanimous vote of all members of the
board of directors of the Company) that the Merger is advisable and fair and in
the best interests of the Company and its stockholders, (b) authorized and
approved (pursuant to a unanimous vote of all members of the board of directors
of the Company) the execution, delivery and performance of this Agreement by the
Company and approved (pursuant to a unanimous vote of all members of the board
of directors of the Company) the Merger, (c) recommended (pursuant to a
unanimous vote of all members of the board of directors of the Company) the
approval of this Agreement and the Merger by the holders of Company Common Stock
and directed that this Agreement and the Merger be submitted for consideration
by the
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Company's stockholders at the Company Stockholders' Meeting (as defined in
Section 5.2), and (d) adopted (pursuant to a unanimous vote of all members of
the board of directors of the Company) a resolution having the effect of causing
the Company not to be subject to any state takeover law or similar Legal
Requirement that might otherwise apply to the Merger or any of the other
transactions contemplated by this Agreement. This Agreement constitutes the
legal, valid and binding obligation of the Company, enforceable against the
Company in accordance with its terms, subject to (i) laws of general application
relating to bankruptcy, insolvency and the relief of debtors, and (ii) rules of
law governing specific performance, injunctive relief and other equitable
remedies.

     2.23  SECTION 203 OF THE DGCL NOT APPLICABLE.  As of the date hereof and at
all times on or prior to the Effective Time, the restrictions applicable to
business combinations contained in Section 203 of the DGCL are, and will be,
inapplicable to the execution, delivery and performance of this Agreement and to
the consummation of the Merger and the other transactions contemplated by this
Agreement. Prior to the execution of those certain Voting Agreements of even
date herewith between Parent and each of the Persons identified in Part 2.23 of
the Company Disclosure Schedule, the Board of Directors of the Company approved
said Voting Agreements and the transactions contemplated thereby.

     2.24  RESERVED.

     2.25  RESERVED.

     2.26  ACCOUNTING MATTERS.  To the Knowledge of the Company, neither any of
the Acquired Corporations nor any affiliate (as that term is used in Rule 145
under the Securities Act) of any of the Acquired Corporations has taken or
agreed to take, or plans to take, any action that could prevent Parent from
accounting for the Merger as a "pooling of interests" in accordance with
generally accepted accounting principles, Accounting Principles Board Opinion
No. 16 and all published rules, regulations and policies of the SEC. The Company
has received oral advice from PricewaterhouseCoopers LLP regarding
PricewaterhouseCoopers LLP's concurrence with the Company's management's
conclusion (subject to the qualifications contained in such oral advice) that
the Company is a "poolable entity" in accordance with generally accepted
accounting principles, Accounting Principles Board Opinion No. 16 and all
published rules, regulations and policies of the SEC, such advice being based on
facts and circumstances known to the Company and PricewaterhouseCoopers LLP as
of the date of this Agreement.

     2.27  VOTE REQUIRED.  The affirmative vote of the holders of a majority of
the shares of Company Common Stock outstanding on the record date for the
Company Stockholders' Meeting (the "REQUIRED COMPANY STOCKHOLDER VOTE") is the
only vote of the holders of any class or series of the Company's capital stock
necessary to approve this Agreement, the Merger and the other transactions
contemplated by this Agreement.

     2.28  NON-CONTRAVENTION; CONSENTS.  Except as would not result in a
Material Adverse Effect on the Acquired Corporations, neither (1) the execution,
delivery or performance of this Agreement by the Company, nor (2) the
consummation of the Merger or any of the other transactions contemplated by this
Agreement by the Company, will (with or without notice or lapse of time):

          (a) contravene, conflict with or result in a violation of (i) any of
     the provisions of the certificate of incorporation, bylaws or other charter
     or organizational documents of any of the Acquired Corporations, or (ii)
     any resolution adopted by the stockholders, the board of directors or any
     committee of the board of directors of any of the Acquired Corporations;

          (b) contravene, conflict with or result in a violation of any Legal
     Requirement, or give any Governmental Body or other Person the right to
     challenge the Merger or any of the other transactions contemplated by this
     Agreement or to exercise any remedy or obtain any relief under any order,
     writ, injunction, judgment or decree to which any of the Acquired
     Corporations, or any of the assets owned or used by any of the Acquired
     Corporations, is subject;

          (c) contravene, conflict with or result in a violation of any of the
     terms or requirements of, or give any Governmental Body the right to
     revoke, withdraw, suspend, cancel, terminate or modify, any

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     Governmental Authorization that is held by any of the Acquired Corporations
     or that otherwise relates to the business of any of the Acquired
     Corporations or to any of the assets owned or used by any of the Acquired
     Corporations;

          (d) contravene, conflict with or result in a material violation or
     breach of, or result in a material default under, any provision of any
     Material Contract, or give any Person the right to (i) declare a default or
     exercise any remedy under any such Material Contract, (ii) accelerate the
     maturity or performance of any such Material Contract, or (iii) cancel,
     terminate or modify any term of such Material Contract; or

          (e) result in the imposition or creation of any Encumbrance upon or
     with respect to any asset owned or used by any of the Acquired Corporations
     (except for minor liens that will not, in any case or in the aggregate,
     materially detract from the value of the assets subject thereto or
     materially impair the operations of any of the Acquired Corporations).

Except as may be required by the Exchange Act, the DGCL, the HSR Act, any
applicable competition laws outside the United States and the NASD Bylaws (as
they relate to the Form S-4 Registration Statement and the Joint
Prospectus/Proxy Statement) and except as set forth in Part 2.28 of the Company
Disclosure Schedule, none of the Acquired Corporations was, is or will be
required to make any filing with or give any notice to, or to obtain any Consent
from, any Person in connection with (x) the execution, delivery or performance
of this Agreement or any of the other agreements referred to in this Agreement
or (y) the consummation of the Merger or any of the other transactions
contemplated by this Agreement.

     2.29  FAIRNESS OPINION.  The Company's board of directors has received the
written opinion of Gleacher & Co., financial advisor to the Company ("COMPANY
FINANCIAL ADVISOR"), dated the date of this Agreement, to the effect that the
Exchange Ratio is fair to the stockholders of the Company from a financial point
of view.

     2.30  FINANCIAL ADVISOR.  Except for the Company Financial Advisor, no
broker, finder or investment banker is entitled to any brokerage, finder's or
other fee or commission in connection with the Merger or any of the other
transactions contemplated by this Agreement based upon arrangements made by or
on behalf of any of the Acquired Corporations. The Company has furnished to
Parent accurate and complete copies of all agreements under which any such fees,
commissions or other amounts have been paid to and all indemnification and other
agreements related to the engagement of the Company Financial Advisor.

     2.31  FULL DISCLOSURE.

     (a) This Agreement (including the Company Disclosure Schedule) does not,
and the certificate referred to in Section 6.(h) will not, (i) contain any
representation, warranty or information that is false or misleading with respect
to any material fact, or (ii) omit to state any material fact necessary in order
to make the representations, warranties and information contained and to be
contained herein and therein (in the light of the circumstances under which such
representations, warranties and information were or will be made or provided)
not false or misleading.

     (b) None of the information supplied or to be supplied by or on behalf of
the Company for inclusion or incorporation by reference in the Form S-4
Registration Statement will, at the time the Form S-4 Registration Statement
becomes effective under the Securities Act, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary in order to make the statements therein, in the light of the
circumstances under which they are made, not misleading. None of the information
supplied or to be supplied by or on behalf of the Company for inclusion or
incorporation by reference in the Joint Prospectus/Proxy Statement will, at the
time the Joint Prospectus/Proxy Statement is mailed to the stockholders of the
Company and Parent or at the time of the Company Stockholders' Meeting or Parent
Stockholders' Meeting, contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary in order
to make the statements therein, in the light of the circumstances under which
they are made, not misleading. The Joint Prospectus/Proxy Statement will comply
as to form in all material respects with the provisions of the
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Exchange Act and the rules and regulations promulgated by the SEC thereunder,
except that no representation or warranty is made by the Company with respect to
statements made or incorporated by reference therein based on information
supplied by Parent for inclusion or incorporation by reference in the Joint
Prospectus/Proxy Statement.

SECTION 3.  REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB

     Parent and Merger Sub represent and warrant to the Company as follows:

     3.1  ORGANIZATION, STANDING AND POWER.  Each of Parent and Merger Sub is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has all necessary power and authority: (a) to
conduct its business in the manner in which its business is currently being
conducted; (b) to own and use its assets in the manner in which its assets are
currently owned and used; and (c) to perform its obligations under all Contracts
by which it is bound. Each of Parent and Merger Sub is duly qualified to do
business as a foreign corporation, and is in good standing, under the laws of
all jurisdictions where the nature of its business requires such qualification
and where the failure to be so qualified would have a Material Adverse Effect on
Parent or Merger Sub.

     3.2  SEC FILINGS; FINANCIAL STATEMENTS.

     (a) Parent has delivered or made available to the Company (including
through the SEC EDGAR system) accurate and complete copies (excluding copies of
exhibits) of each report, registration statement and definitive proxy statement
filed by Parent with the SEC between January 1, 1999 and the date of this
Agreement (the "PARENT SEC DOCUMENTS"). Since January 1, 1999, all statements,
reports, schedules, forms and other documents required to have been filed by
Parent with the SEC have been so filed. As of the time it was filed with the SEC
(or, if amended or superseded by a filing prior to the date of this Agreement,
then on the date of such filing): (i) each of the Parent SEC Documents complied
in all material respects with the applicable requirements of the Securities Act
or the Exchange Act (as the case may be); and (ii) none of the Parent SEC
Documents contained any untrue statement of a material fact or omitted to state
a material fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

     (b) The consolidated financial statements (including any related notes)
contained in the Parent SEC Documents: (i) complied as to form in all material
respects with the published rules and regulations of the SEC applicable thereto;
(ii) were prepared in accordance with generally accepted accounting principles
applied on a consistent basis throughout the periods covered (except as may be
indicated in the notes to such financial statements and, in the case of
unaudited statements, as permitted by Form 10-Q of the SEC, and except that
unaudited financial statements may not contain footnotes and are subject to
year-end audit adjustments); and (iii) fairly present the consolidated financial
position of Parent and its subsidiaries as of the respective dates thereof and
the consolidated results of operations of Parent and its subsidiaries for the
periods covered thereby.

     3.3  FULL DISCLOSURE.

     (a) This Agreement does not, and the certificate referred to in Section
7.5(b) will not, (i) contain any representation, warranty or information that is
false or misleading with respect to any material fact, or (ii) omit to state any
material fact necessary in order to make the representations, warranties and
information contained and to be contained herein and therein (in the light of
the circumstances under which such representations, warranties and information
were or will be made or provided) not false or misleading.

     (b) None of the information supplied or to be supplied by or on behalf of
Parent for inclusion in the Form S-4 Registration Statement will, at the time
the Form S-4 Registration Statement becomes effective under the Securities Act,
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary in order to make the statements
therein, in the light of the circumstances under which they are made, not
misleading. None of the information supplied or to be supplied by or on behalf
of Parent for inclusion or incorporation by reference in the Joint Prospectus/
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<PAGE>   138

Proxy Statement will, at the time the Joint Prospectus/Proxy Statement is mailed
to the stockholders of the Company and Parent or at the time of the Company
Stockholders' Meeting or Parent Stockholders' Meeting, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in the
light of the circumstances under which they are made, not misleading. The Joint
Prospectus/Proxy Statement will comply as to form in all material respects with
the provisions of the Exchange Act and the rules and regulations promulgated by
the SEC thereunder, except that no representation or warranty is made by Parent
with respect to statements made or incorporated by reference therein based on
information supplied by the Company for inclusion or incorporation by reference
in the Joint Prospectus/Proxy Statement.

     3.4  AUTHORITY; BINDING NATURE OF AGREEMENT.  Parent and Merger Sub have
the absolute and unrestricted right, power and authority to enter into and to
perform their obligations under this Agreement. The board of directors of Parent
(at a meeting duly called and held on June 6, 2000) has (a) determined (pursuant
to a unanimous vote of all members of the board of directors of Parent) that the
Merger and the issuance of Parent Common Stock in the Merger are advisable and
fair and in the best interests of Parent and its stockholders, (b) authorized
and approved (pursuant to a unanimous vote of all members of the board of
directors of Parent) the execution, delivery and performance of this Agreement
by Parent and approved (pursuant to a unanimous vote of all members of the board
of directors of Parent) the Merger and the issuance of Parent Common Stock in
the Merger and (c) recommended (pursuant to a unanimous vote of all members of
the board of directors of Parent) the approval of the issuance of Parent Common
Stock in the Merger and the election of Lev J. Leytes to Parent's Board of
Directors by the holders of Parent Common Stock and directed that the issuance
of Parent Common Stock in the Merger and the election of Lev J. Leytes to
Parent's Board of Directors be submitted for consideration by Parent's
stockholders at the Parent Stockholders' Meeting (as defined in Section 5.3).
This Agreement constitutes the legal, valid and binding obligation of Parent and
Merger Sub, enforceable against them in accordance with its terms, subject to
(i) laws of general application relating to bankruptcy, insolvency and the
relief of debtors, and (ii) rules of law governing specific performance,
injunctive relief and other equitable remedies.

     3.5  VOTE REQUIRED.  The affirmative vote of the holders of a majority of
the shares of Parent Common Stock voting at a Parent Stockholders' Meeting at
which a quorum is present, cast in person or by proxy as prescribed by the rules
of the NASD (the "REQUIRED PARENT STOCKHOLDER VOTE"), is the only vote of the
holders of any class or series of the Parent's capital stock necessary to
approve this Agreement, the Merger and the other transactions contemplated by
this Agreement. Prior to the execution of those certain Voting Agreements of
even date herewith between the Company and each of the Persons identified in
Part 3.5 of the Parent Disclosure Schedule, the Board of Directors of Parent
approved said Voting Agreements and the transactions contemplated thereby.

     3.6  NON-CONTRAVENTION; CONSENTS.  Neither (1) the execution, delivery or
performance of this Agreement by Parent or Merger Sub, nor (2) the consummation
of the Merger or any of the other transactions contemplated by this Agreement by
Parent or Merger Sub, will (with or without notice or lapse of time):

          (a) contravene, conflict with or result in a violation of (i) any of
     the provisions of the certificate of incorporation, bylaws or other charter
     or organizational documents of Parent or Merger Sub, or (ii) any resolution
     adopted by the stockholders, the board of directors or any committee of the
     board of directors of Parent or Merger Sub;

          (b) contravene, conflict with or result in a violation of any Legal
     Requirement, or give any Governmental Body or other Person the right to
     challenge the Merger or any of the other transactions contemplated by this
     Agreement or to exercise any remedy or obtain any relief under any order,
     writ, injunction, judgment or decree to which Parent or Merger Sub, or any
     of the assets owned or used by Parent or Merger Sub, is subject;

          (c) contravene, conflict with or result in a violation of any of the
     terms or requirements of, or give any Governmental Body the right to
     revoke, withdraw, suspend, cancel, terminate or modify, any
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     Governmental Authorization that is held by Parent or Merger Sub or that
     otherwise relates to the business of Parent or Merger Sub or to any of the
     assets owned or used by Parent or Merger Sub;

          (d) contravene, conflict with or result in a material violation or
     breach of, or result in a material default under, any provision of any
     Material Contract, or give any Person the right to (i) declare a default or
     exercise any remedy under any such Material Contract, (ii) accelerate the
     maturity or performance of any such Material Contract, or (iii) cancel,
     terminate or modify any term of such Material Contract; or

          (e) result in the imposition or creation of any Encumbrance upon or
     with respect to any asset owned or used by Parent or Merger Sub (except for
     minor liens that will not, in any case or in the aggregate, materially
     detract from the value of the assets subject thereto or materially impair
     the operations of any of the Acquired Corporations).

Except as may be required by the Exchange Act, the DGCL, the HSR Act, any
applicable competition laws outside the United States and the NASD Bylaws (as
they relate to the Form S-4 Registration Statement and the Joint
Prospectus/Proxy Statement), neither Parent nor Merger Sub was, is or will be
required to make any filing with or give any notice to, or to obtain any Consent
from, any Person in connection with (x) the execution, delivery or performance
of this Agreement or any of the other agreements referred to in this Agreement,
or (y) the consummation of the Merger or any of the other transactions
contemplated by this Agreement.

     3.7  VALID ISSUANCE.  The Parent Common Stock to be issued in the Merger
will, when issued in accordance with the provisions of this Agreement, be
validly issued, fully paid and nonassessable.

     3.8  ACCOUNTING MATTERS.  To the knowledge of Parent, neither Parent nor
any of its affiliates has taken or agreed to, or plans to, take any action that
would prevent Parent from accounting for the Merger as a "pooling of interests"
in accordance with generally accepted accounting principles, Accounting
Principles Board Opinion No. 16 and all published rules, regulations and
policies of the SEC. Parent has received oral advice from Ernst & Young LLP
regarding Ernst & Young LLP's concurrence with Parent's management's conclusion
that the Merger should be treated as a "pooling of interests" in accordance with
generally accepted accounting principles, Accounting Principles Board Opinion
No. 16 and all published rules, regulations and policies of the SEC, such advice
being based on facts and circumstances known to Parent and Ernst & Young LLP,
and provided by the Company and PricewaterhouseCoopers LLP as of the date of
this Agreement.

     3.9  CAPITALIZATION, ETC.

     (a) The authorized capital stock of Parent consists of: 30,000,000 shares
of Parent Common Stock, of which 11,480,940 shares had been issued and were
outstanding as of June 5, 2000. Parent has not repurchased any shares of its
capital stock and does not hold any shares of its capital stock in its treasury,
except for the repurchase of Parent Common Stock from employees or consultants
upon termination of their employment or consulting relationship with Parent. All
of the outstanding shares of Parent Common Stock have been duly authorized and
validly issued, and are fully paid and nonassessable. Except as set forth in the
Parent SEC Reports: (i) none of the outstanding shares of Parent Common Stock is
entitled or subject to any preemptive right, right of first offer or any similar
right created by Parent or imposed under applicable law with respect to capital
stock of Parent; (ii) none of the outstanding shares of Parent Common Stock is
subject to any right of first refusal in favor of Parent; and (iii) there is no
Parent Contract relating to the voting or registration of, or restricting any
Person from purchasing, selling, pledging or otherwise disposing of (or granting
any option or similar right with respect to), any shares of Parent Common Stock.
Parent is not under any obligation, or is bound by any Contract pursuant to
which it may become obligated, to repurchase, redeem or otherwise acquire any
outstanding shares of Parent Common Stock.

     (b) As of June 5, 2000: (i) 1,782,041 shares of Parent Common Stock were
subject to issuance pursuant to outstanding options to purchase shares of Parent
Common Stock; and (ii) 93,886 shares of Parent Common Stock were reserved for
future issuance pursuant to Parent's Employee Stock Purchase
                                      A-27
<PAGE>   140

Plan (the "PARENT ESPP"). (Stock options granted by Parent pursuant to Parent's
stock option plans and otherwise are referred to in this Agreement as "PARENT
OPTIONS.") Parent has delivered or made available to Parent accurate and
complete copies of all stock option plans pursuant to which Parent has ever
granted stock options, the forms of all stock option agreements evidencing such
options.

     (c) Except as set forth in Section 3.9(b), as of June 5, 2000 there was no:
(i) outstanding subscription, option, call, warrant or right (whether or not
currently exercisable) to acquire any shares of the capital stock or other
securities of Parent; (ii) outstanding security, instrument or obligation that
is or may become convertible into or exchangeable for any shares of the capital
stock or other securities of Parent; (iii) stockholder rights plan (or similar
plan commonly referred to as a "poison pill") or Contract under which Parent is
or may become obligated to sell or otherwise issue any shares of its capital
stock or any other securities; or (iv) to the knowledge of Parent, condition or
circumstance that may give rise to or provide a basis for the assertion of a
claim by any Person to the effect that such Person is entitled to acquire or
receive any shares of capital stock or other securities of Parent.

     (d) All outstanding shares of Parent Common Stock, all outstanding Parent
Options, and all outstanding shares of capital stock of each Subsidiary of
Parent have been issued and granted in compliance with (i) all applicable
securities laws and other applicable Legal Requirements, and (ii) all material
requirements set forth in applicable Contracts.

     (e) There has been no material change to Parent's capitalization between
June 5, 2000 and the date hereof.

     3.10  INTELLECTUAL PROPERTY.

     (a) Parent has good, valid and marketable title to all Proprietary Assets
owned by Parent that are material to the business of Parent, free and clear of
all Encumbrances, except for (i) any lien for current taxes not yet due and
payable, and (ii) minor liens that have arisen in the ordinary course of
business and that do not (individually or in the aggregate) materially detract
from the value of the assets subject thereto or materially impair the operations
of Parent. Parent has a valid right to use, license and otherwise exploit all
Proprietary Assets licensed or otherwise made available to Parent that are
material to Parent. Except as set forth in the Parent SEC Reports, Parent has
not developed jointly with any other Person any Proprietary Asset that is
material to the business of the Parent with respect to which such other Person
has any rights. Except as set forth in the Parent SEC Reports, there is no
Parent Contract (with the exception of end user license agreements in the form
previously delivered by Parent to the Company) pursuant to which any Person has
any right (whether or not currently exercisable) to use, license or otherwise
exploit any Parent Proprietary Asset.

     (b) Parent has taken reasonable measures and precautions to protect and
maintain the confidentiality, secrecy and value of all material Parent
Proprietary Assets (except Parent Proprietary Assets whose value would be
unimpaired by disclosure). Without limiting the generality of the foregoing,
except as would not result in a Material Adverse Effect on Parent, (i) all
current and former employees of Parent who are or were involved in, or who have
contributed to, the creation or development of any material Parent Proprietary
Asset have executed and delivered to Parent an agreement that is substantially
identical to the form of Confidential Information and Invention Assignment
Agreement previously delivered by Parent to the Company, and (ii) all current
and former consultants and independent contractors to Parent who are or were
involved in, or who have contributed to, the creation or development of any
material Parent Proprietary Asset have executed and delivered to Parent an
agreement that is substantially identical to the form of Consultant Confidential
Information and Invention Assignment Agreement previously delivered to the
Company. No current or former employee, officer, director, stockholder,
consultant or independent contractor has any right, claim or interest in or with
respect to any Parent Proprietary Asset.

     (c) To the knowledge of Parent: (i) all patents, trademarks, service marks
and copyrights held by Parent are valid, enforceable and subsisting; (ii) none
of the Parent Proprietary Assets and no Proprietary Asset that is currently
being developed by Parent (either by itself or with any other Person) infringes,
misappropriates or conflicts with any Proprietary Asset owned or used by any
other Person; (iii) none of

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the products that are or have been designed, created, developed, assembled,
manufactured or sold by Parent is infringing, misappropriating or making any
unlawful or unauthorized use of any Proprietary Asset owned or used by any other
Person, and none of such products has at any time infringed, misappropriated or
made any unlawful or unauthorized use of, and Parent has received no notice or
other communication (in writing or otherwise) of any actual, alleged, possible
or potential infringement, misappropriation or unlawful or unauthorized use of,
any Proprietary Asset owned or used by any other Person; (iv) no other Person is
infringing, misappropriating or making any unlawful or unauthorized use of, and
no Proprietary Asset owned or used by any other Person infringes or conflicts
with, any material Parent Proprietary Asset.

     (d) The Parent Proprietary Assets constitute all the Proprietary Assets
necessary to enable Parent to conduct its business in the manner in which such
business has been and is being conducted. Parent has not (i) licensed any of the
material Parent Proprietary Assets to any Person on an exclusive basis, or (ii)
entered into any covenant not to compete or Contract limiting its ability to
exploit fully any material Parent Proprietary Assets or to transact business in
any market or geographical area or with any Person.

     (e) Except as would not result in a Material Adverse Effect on Parent,
Parent has not disclosed or delivered to any Person, or permitted the disclosure
or delivery to any escrow agent or other Person, of any Parent Source Code. No
event has occurred, and no circumstance or condition exists, that (with or
without notice or lapse of time) will, or could reasonably be expected to,
result in the disclosure or delivery to any Person of any Parent Source Code.

     (f) Except with respect to demonstration or trial copies, no product,
system, program or software module designed or developed, or, to the Knowledge
of Parent sold, licensed or otherwise made available by Parent to any Person
contains any "back door," "time bomb," "Trojan horse," "worm," "drop dead
device," "virus" or other software routines or hardware components designed to
permit unauthorized access or to disable or erase software, hardware or data
without the consent of the user.

     3.11  EMPLOYEE AND LABOR MATTERS

     (a) Parent is in compliance in all material respects with all applicable
Legal Requirements and Contracts relating to employment, employment practices,
wages, bonuses and terms and conditions of employment, including employee
compensation matters.

     (b) Parent has good labor relations and has no knowledge of any facts
indicating that (i) the consummation of the Merger or any of the other
transactions contemplated by this Agreement will have a material adverse effect
on its labor relations, or (ii) any of the employees of Parent intends to
terminate his or her employment with Parent.

     3.12  LEGAL PROCEEDINGS; ORDERS.

     (a) There is no pending Legal Proceeding, and (to the knowledge of Parent)
no Person has threatened to commence any Legal Proceeding: (i) that involves
Parent or any of the assets owned or used by Parent and that, if adversely
determined, would reasonably be expected to have a Material Adverse Effect on
Parent; or (ii) that challenges, or that may have the effect of preventing,
delaying, making illegal or otherwise interfering with, the Merger or any of the
other transactions contemplated by this Agreement. To the knowledge of Parent,
no event has occurred, and no claim, dispute or other condition or circumstance
exists, that would reasonably be expected to, give rise to or serve as a basis
for the commencement of any such Legal Proceeding.

     (b) There is no material order, writ, injunction, judgment or decree to
which Parent, or any of the assets owned or used by Parent, is subject. To the
knowledge of Parent, no officer or key employee of Parent is subject to any
order, writ, injunction, judgment or decree that prohibits such officer or other
key employee from engaging in or continuing any conduct, activity or practice
relating to the business of Parent.

     3.13  FAIRNESS OPINION.  Parent's board of directors has received the
written opinion of ING Barings LLC, financial advisor to Parent, dated the date
of this Agreement, to the effect that the Exchange Ratio is fair to the
stockholders of Parent from a financial point of view.
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     3.14  FINANCIAL ADVISOR.  Except for ING Barings LLC ("PARENT INVESTMENT
BANKER"), no broker, finder or investment banker is entitled to any brokerage,
finder's or other fee or commission in connection with the Merger or any of the
other transactions contemplated by this Agreement based upon arrangements made
by or on behalf of Parent.

     3.15  ABSENCE OF CHANGES.  Except as set forth in the Prospectus filed by
Parent with the SEC on May 25, 2000 pursuant to Rule 424(b)(4) under the
Securities Act, since March 31, 2000:

          (a) there has not been any material adverse change in the business,
     condition, assets, liabilities, operations or results of operations of
     Parent and its subsidiaries taken as a whole, and no event has occurred, in
     either case that would reasonably be expected to have a Material Adverse
     Effect on Parent;

          (b) there has not been any material loss, damage or destruction to, or
     any material interruption in the use of, any of the assets of any of Parent
     and its subsidiaries taken as a whole (whether or not covered by insurance)
     that has had or would reasonably be expected to have a Material Adverse
     Effect on Parent;

          (c) Parent has not (i) declared, accrued, set aside or paid any
     dividend or made any other distribution in respect of any shares of capital
     stock or (ii) repurchased, redeemed or otherwise reacquired any shares of
     capital stock or other securities;

          (d) Parent has not sold, issued or granted, or authorized the issuance
     of, (i) any capital stock or other security (except for Parent Common Stock
     issued upon the valid exercise of outstanding Parent Options in accordance
     with the terms of the option agreement pursuant to which such Parent
     Options are outstanding and shares of Parent Common Stock to be issued
     pursuant to the Parent ESPP), (ii) any option, warrant or right to acquire
     any capital stock or any other security (except (A) for Parent Options
     issued in the ordinary course of business consistent with past practice,
     (B) pursuant to the Parent ESPP and (C) warrants as may be issued in the
     ordinary course of business) or (iii) any instrument convertible into or
     exchangeable for any capital stock or other security;

          (e) there has been no amendment to the certificate of incorporation,
     bylaws or other charter or organizational documents of Parent, and neither
     Parent nor any of its subsidiaries has effected or been a party to any
     merger, consolidation, amalgamation, share exchange, business combination,
     recapitalization, reclassification of shares, stock split, division or
     subdivision of shares, reverse stock split, consolidation of shares or
     similar transaction;

          (f) neither Parent nor any of its subsidiaries has entered into any
     material transaction or taken any other material action that has had, or
     would reasonably be expected to have, a Material Adverse Effect on Parent;

          (g) neither Parent nor any of its subsidiaries has entered into any
     material transaction or taken any other material action outside the
     ordinary course of business or inconsistent with past practices; and

          (h) neither Parent nor any of its subsidiaries has agreed or committed
     to take any of the actions referred to in the foregoing subsections of this
     Section 3.15.

     3.16  LIABILITIES.  Parent has no accrued, contingent or other liabilities
of any nature, either matured or unmatured, except for: (a) liabilities
identified as such in the "liabilities" column of the Parent's Unaudited
Consolidated Balance Sheet as of March 31, 2000; (b) normal and recurring
current liabilities that have been incurred by Parent since March 31, 2000 in
the ordinary course of business and consistent with past practices; and (c)
liabilities that have not had, and would not reasonably be expected to have, a
Material Adverse Effect on Parent.

     3.17  COMPLIANCE WITH LEGAL REQUIREMENTS.  Parent is, and has at all times
since January 1, 2000 been, in compliance with all applicable Legal
Requirements, except where the failure to comply with such Legal Requirements
has not had and would not reasonably be expected to have a Material Adverse
Effect

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on Parent. Since January 1, 2000, Parent has not received any notice or other
communication from any Governmental Body or other Person regarding any actual or
possible violation of, or failure to comply with, any Legal Requirement.

SECTION 4.  CERTAIN COVENANTS OF THE COMPANY

     4.1  ACCESS AND INVESTIGATION.

     (a) During the period from the date of this Agreement through the Effective
Time (the "PRE-CLOSING PERIOD"), the Company shall, and shall cause the
respective Representatives of the Acquired Corporations to: (a) provide Parent
and Parent's Representatives with reasonable access to the Acquired
Corporations' Representatives, personnel and assets and to all existing books,
records, Tax Returns, work papers and other documents and information relating
to the Acquired Corporations; and (b) provide Parent and Parent's
Representatives with such copies of the existing books, records, Tax Returns,
work papers and other documents and information relating to the Acquired
Corporations, and with such additional financial, operating and other data and
information regarding the Acquired Corporations, as Parent may reasonably
request. Without limiting the generality of the foregoing, during the
Pre-Closing Period, the Company shall promptly provide Parent with copies of:

          (i) all material operating and financial reports prepared by the
     Company and its Subsidiaries for the Company's senior management, including
     (A) copies of the unaudited quarterly consolidated balance sheets of the
     Acquired Corporations and the related unaudited quarterly consolidated
     statements of operations and statements of cash flows and (B) copies of any
     sales forecasts, development plans and hiring reports prepared for the
     Company's senior management;

          (ii) any written materials or communications sent by or on behalf of
     the Company to its stockholders;

          (iii) any material notice, document or other communication sent by or
     on behalf of any of the Acquired Corporations to any party to any Acquired
     Corporation Contract or sent to any of the Acquired Corporations by any
     party to any Acquired Corporation Contract (other than any communication
     that relates solely to routine commercial transactions between any Acquired
     Corporation and the other party to any such Acquired Corporation Contract
     and that is of the type sent in the ordinary course of business and
     consistent with past practices);

          (iv) any notice, report or other document (A) filed with or sent to
     NIST, or (B) filed with or sent to any Governmental Body in connection with
     the Merger or any of the other transactions contemplated by this Agreement;
     and

          (v) any material notice, report or other document received by any of
     the Acquired Corporations from any Governmental Body.

     (b) During the Pre-Closing Period, Parent shall, and shall cause the
respective Representatives of Parent to, provide the Company and the Company's
Representatives with reasonable access to Parent's Representatives, personnel
and assets and to all existing books, records, Tax Returns, work papers and
other documents and information relating to Parent.

     (c) The parties acknowledge that all investigations and discussions
conducted by each of them pursuant to this Section 4.1 shall be subject to (i)
the Confidentiality Agreement dated as of June 2, 2000 executed by the Company
with respect to materials provided by Parent to the Company and (ii) the
Confidentiality Agreement dated as of October 8, 1999 executed by Parent with
respect to materials provided by the Company to Parent.

     4.2  OPERATION OF THE COMPANY'S BUSINESS.

     (a) During the Pre-Closing Period: (i) the Company shall ensure that each
of the Acquired Corporations conducts its business and operations (A) in the
ordinary course and in accordance with past practices and (B) in substantial
compliance with all applicable Legal Requirements and the material

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requirements of all Material Contracts; (ii) the Company shall use commercially
reasonable efforts to ensure that each of the Acquired Corporations preserves
intact its current business organization, keeps available the services of its
current officers and other employees and maintains its relations and goodwill
with all suppliers, customers, landlords, creditors, licensors, licensees,
employees and other Persons having business relationships with the respective
Acquired Corporations; and (iii) the Acquired Corporations shall keep in full
force or renew all insurance policies referred to in Section 2.19.

     (b) During the Pre-Closing Period, the Company shall not (without the prior
written consent of Parent), and shall not permit any of the other Acquired
Corporations to:

          (i) declare, accrue, set aside or pay any or make any other
     distribution in respect of any shares of capital stock, or repurchase,
     redeem or otherwise reacquire any shares of capital stock or other
     securities except for the repurchase of Common Stock from employees or
     consultants upon termination of their employment or consulting relationship
     with the Company;

          (ii) sell, issue, grant or authorize the issuance or grant of (A) any
     capital stock or other security, (B) any option, call, warrant or right to
     acquire any capital stock or other security, or (C) any instrument
     convertible into or exchangeable for any capital stock or other security
     (except that (1) the Company may issue shares of Company Common Stock (x)
     upon the valid exercise of Company Options or Company Warrants outstanding
     as of the date of this Agreement, or (y) pursuant to the ESPP, and (2) the
     Company may, in the ordinary course of business and consistent with past
     practices, grant options under its stock option plans to purchase no more
     than a total of 75,000 shares of Company Common Stock to employees of the
     Acquired Corporations);

          (iii) amend or waive any of its rights under, or accelerate the
     vesting under, any provision of any of the Company's stock option plans,
     any provision of any agreement evidencing any outstanding stock option or
     any restricted stock purchase agreement, or otherwise modify any of the
     terms of any outstanding option, warrant or other security or any related
     Contract;

          (iv) amend or permit the adoption of any amendment to its certificate
     of incorporation or bylaws or other charter or organizational documents, or
     effect or become a party to any merger, consolidation, amalgamation, share
     exchange, business combination, recapitalization, reclassification of
     shares, stock split, division or subdivision of shares, reverse stock
     split, consolidation of shares or similar transaction;

          (v) form any Subsidiary or acquire any equity interest or other
     interest in any other Entity;

          (vi) make any capital expenditure (except that the Acquired
     Corporations may make capital expenditures in the ordinary course of
     business and consistent with past practices that, when added to all other
     capital expenditures made on behalf of the Acquired Corporations during the
     Pre-Closing Period, do not exceed $100,000 in the aggregate);

          (vii) enter into or become bound by, or permit any of the assets owned
     or used by it to become bound by any Material Contract (except that the
     Acquired Corporations may enter into or become bound by Contracts and
     Material Contracts in the ordinary course of business and consistent with
     past practices);

          (viii) amend or terminate, or waive or exercise any material right or
     remedy under, any Material Contract, other than in the ordinary course of
     business consistent with past practices;

          (ix) (A) acquire, lease or license any right or other asset from any
     other Person or sell or otherwise dispose of, or lease or license, any
     right or other asset to any other Person (except in the ordinary course of
     business and consistent with past practices) or (B) waive or relinquish any
     material right;

          (x) lend money to any Person, or incur or guarantee any indebtedness
     (except that the Acquired Corporations may (A) make routine borrowings in
     the ordinary course of business and consistent with

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     past practices under its current line of credit with GE Capital; and (B)
     (in the ordinary course of business and consistent with past practices)
     make advances to employees for valid business purposes);

          (xi) establish, adopt or amend any employee benefit plan, pay any
     bonus or make any profit-sharing or similar payment to, or increase the
     amount of the wages, salary, commissions, fringe benefits or other
     compensation or remuneration payable to, any of its directors, officers or
     employees (except that the Acquired Corporations may in the ordinary course
     of business and consistent with past practices (A) make routine, reasonable
     salary increases in connection with the Acquired Corporations' customary
     employee review process, (B) pay customary bonuses in accordance with
     existing bonus plans referred to in Part 2.17(a) of the Company Disclosure
     Schedule or new bonus plans consistent with existing bonus plans and (C)
     make profit sharing or similar payments;

          (xii) hire any employee at the level of vice president or above, or
     with an annual base salary in excess of $100,000;

          (xiii) change of its pricing policies, product return policies,
     product maintenance polices, service policies, product modification or
     upgrade policies, personnel policies or other business policies, or any of
     its methods of accounting or accounting practices in any respect;

          (xiv) take or permit to be taken any action that could preclude Parent
     from accounting for the merger as a "pooling of interests" for accounting
     purposes;

          (xv) make any Tax election inconsistent with past practices;

          (xvi) initiate any material Legal Proceeding or settle any Legal
     Proceeding involving payments by any of the Acquired Corporations in excess
     of $100,000 or equitable relief against any of the Acquired Corporations;

          (xvii) enter into any material transaction or take any other material
     action outside the ordinary course of business or inconsistent with past
     practices; or

          (xviii) agree or commit to take any of the actions described in the
     foregoing subsections of this Section 4.2(b).

Without limiting any other provision of this Section 4.2(b), during the
Pre-Closing Period, the Company agrees to consult with Parent a reasonable
period of time prior to: (A) permitting any of the Acquired Corporations to
enter into any Contract of the type referred to in Section 2.10(a)(iii), and (B)
hiring any employee who would not be subject to the provision of Section
4.2(b)(xii) (it being understood that the actions referred to in this sentence
shall not require the prior written consent of Parent).

     (c) During the Pre-Closing Period, the Company shall promptly notify Parent
in writing of: (i) the discovery by the Company of any event, condition, fact or
circumstance that occurred or existed on or prior to the date of this Agreement
and that caused or constitutes a material inaccuracy in any representation or
warranty made by the Company in this Agreement; (ii) any event, condition, fact
or circumstance that occurs, arises or exists after the date of this Agreement
and that would cause or constitute a material inaccuracy in any representation
or warranty made by the Company in this Agreement if (A) such representation or
warranty had been made as of the time of the occurrence, existence or discovery
of such event, condition, fact or circumstance, or (B) such event, condition,
fact or circumstance had occurred, arisen or existed on or prior to the date of
this Agreement; (iii) any material breach of any covenant or obligation of the
Company; and (iv) any event, condition, fact or circumstance that would make the
timely satisfaction of any of the conditions set forth in Section 6 or Section 7
impossible or unlikely or that has had or could reasonably be expected to have a
Material Adverse Effect on the Acquired Corporations. Without limiting the
generality of the foregoing, the Company shall promptly advise Parent in writing
of any Legal Proceeding or material claim threatened, commenced or asserted
against or with respect to any of the Acquired Corporations. No notification
given to Parent pursuant to this Section 4.2(c) shall limit or otherwise affect
any of the representations, warranties, covenants or obligations of the Company
contained in this Agreement.

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     (d) If any event, condition, fact or circumstance that is required to be
disclosed pursuant to Section 4.2(c) requires any change in the Disclosure
Schedule, or if any such event, condition, fact or circumstance would require
such a change assuming the Disclosure Schedule were dated as of the date of the
occurrence, existence or discovery of such event, condition, fact or
circumstance, then the Company shall promptly deliver to Parent an update to the
Disclosure Schedule specifying such change. No such update shall be deemed to
supplement or amend the Disclosure Schedule for the purpose of (i) determining
the accuracy of any of the representations and warranties made by the Company or
any of the Designated Shareholders in this Agreement, or (ii) determining
whether any of the conditions set forth in Section 6 has been satisfied.

     4.3  NO SOLICITATION.

     (a) The Company shall not directly or indirectly, and shall not authorize
or permit any of the other Acquired Corporations or any Representative of any of
the Acquired Corporations directly or indirectly to, (i) solicit, initiate,
encourage or induce the making, submission or announcement of any Acquisition
Proposal or take any action that could reasonably be expected to lead to an
Acquisition Proposal, (ii) furnish any information regarding any of the Acquired
Corporations to any Person in connection with or in response to an Acquisition
Proposal, (iii) engage in discussions or negotiations with any Person with
respect to any Acquisition Proposal, (iv) approve, endorse or recommend any
Acquisition Proposal or (v) enter into any letter of intent or similar document
or any Contract contemplating or otherwise relating to any Acquisition
Transaction; provided, however, that prior to the adoption and approval of this
Agreement by the Required Company Stockholder Vote, the Company shall not be
prohibited by this Section 4.3(a) from furnishing nonpublic information
regarding the Acquired Corporations to, or entering into discussions with, any
Person in response to a Superior Offer that is submitted by such Person (and not
withdrawn) if (1) neither the Company nor any Representative of any of the
Acquired Corporations shall have violated any of the restrictions set forth in
this Section 4.3, (2) the board of directors of the Company concludes in good
faith, after consultation with its outside legal counsel, that the failure to
take such action would be inconsistent with the fiduciary obligations of such
board of directors to the Company's stockholders under applicable law, (3) prior
to furnishing any such nonpublic information to, or entering into discussions
with, such Person, the Company gives Parent written notice of the identity of
such Person and of the Company's intention to furnish nonpublic information to,
or enter into discussions with, such Person, and the Company receives from such
Person an executed confidentiality agreement containing customary limitations on
the use and disclosure of all nonpublic written and oral information furnished
to such Person by or on behalf of the Company, and (4) prior to furnishing any
such nonpublic information to such Person, the Company furnishes such nonpublic
information to Parent (to the extent such nonpublic information has not been
previously furnished by the Company to Parent); and provided, further, that
nothing herein shall prevent the Board of Directors of the Company from taking,
and disclosing to the Company's stockholders, a position contemplated by Rules
14d-9 and 14e-2 promulgated under the Exchange Act. The parties agree that for
purposes of the preceding sentence (but for no other purpose), an offer which is
conditioned on completion of due diligence and other customary conditions (and
regarding which the board of directors of the Company determines, in good faith,
based on the advice of its financial advisor, that financing is likely to be
obtained) shall be deemed to constitute a "Superior Offer" if such offer
otherwise meets the definition of "Superior Offer" set forth in Exhibit A (other
than the financing portion of such definition). Without limiting the generality
of the foregoing, the Company acknowledges and agrees that any violation of any
of the restrictions set forth in the preceding sentence by any Representative of
any of the Acquired Corporations, whether or not such Representative is
purporting to act on behalf of any of the Acquired Corporations, shall be deemed
to constitute a breach of this Section 4.3 by the Company. The Company shall
promptly notify Parent in writing of any material inquiry, proposal or offer
relating to a possible Acquisition Transaction that is received by the Company
during the Pre-Closing Period.

     (b) The Company shall promptly advise Parent orally and in writing of any
Acquisition Proposal (including the identity of the Person making or submitting
such Acquisition Proposal and the terms thereof) that is made or submitted by
any Person during the Pre-Closing Period. The Company shall keep

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Parent fully informed with respect to the status of any such Acquisition
Proposal and any modification or proposed modification thereto.

     4.4  OPERATION OF PARENT'S BUSINESS.

     (a) During the Pre-Closing Period: (i) Parent shall ensure that it conducts
its business and operations (A) in the ordinary course and in accordance with
past practices and (B) in substantial compliance with all applicable Legal
Requirements and the material requirements of all material contracts; and (ii)
Parent shall use commercially reasonable efforts to ensure that it preserves
intact its current business organization, keeps available the services of its
current officers and other employees and maintains its relations and goodwill
with all suppliers, customers, landlords, creditors, licensors, licensees,
employees and other Persons having business relationships with Parent. By way of
amplification and without limitation, neither Parent nor any of its subsidiaries
shall, between the date hereof and the Effective Time, directly or indirectly
do, or propose to do, any of the following without the prior written consent of
Company:

          (i) amend or otherwise change the Certificate of Incorporation or
     Bylaws or equivalent organizational document of Parent or any of its
     subsidiaries or alter through merger, liquidation, reorganization,
     restructuring or in any other fashion the corporate structure of Parent;

          (ii) amend the terms of, repurchase, redeem or otherwise acquire, or
     permit any Subsidiary to repurchase, redeem or otherwise acquire, any of
     its securities or any securities of its Subsidiaries; or propose to do any
     of the foregoing;

          (iii) (x) acquire or agree to acquire by merging or consolidating
     with, or by purchasing any equity interest in or a portion of the assets
     of, or by any other manner, any business or any corporation, partnership,
     association or other business organization or division thereof, or (y)
     otherwise acquire or agree to acquire any assets which are material,
     individually or in the aggregate, to the business of Parent or enter into
     any joint ventures, strategic partnerships or alliances, in the case of
     both (x) and (y), where such acquisition or agreement is reasonably likely
     to materially delay consummation of the Merger or materially adversely
     affect Parent's ability to consummate the Merger;

          (iv) adopt a plan of complete or partial liquidation or dissolution of
     Parent;

          (v) fail to make in a timely manner any material filings with the SEC
     required under the Securities Act or the Exchange Act or the rules or
     regulations promulgated thereunder; or

          (vi) agree in writing or otherwise to take any of the actions
     described in Section 4.4(a)(i) through (v) above.

     (b) During the Pre-Closing Period, Parent shall promptly notify the Company
in writing of: (i) the discovery by Parent of any event, condition, fact or
circumstance that occurred or existed on or prior to the date of this Agreement
and that caused or constitutes a material inaccuracy in any representation or
warranty made by Parent in this Agreement; (ii) any event, condition, fact or
circumstance that occurs, arises or exists after the date of this Agreement and
that would cause or constitute a material inaccuracy in any representation or
warranty made by Parent in this Agreement if (A) such representation or warranty
had been made as of the time of the occurrence, existence or discovery of such
event, condition, fact or circumstance, or (B) such event, condition, fact or
circumstance had occurred, arisen or existed on or prior to the date of this
Agreement; (iii) any material breach of any covenant or obligation of Parent;
and (iv) any event, condition, fact or circumstance that would make the timely
satisfaction of any of the conditions set forth in Section 6 or Section 7
impossible or unlikely or that has had or could reasonably be expected to have a
Material Adverse Effect on Parent. Without limiting the generality of the
foregoing, Parent shall promptly advise the Company in writing of any Legal
Proceeding or material claim overtly threatened, commenced or asserted against
or with respect to Parent. No notification given to the Company pursuant to this
Section 4.4(b) shall limit or otherwise affect any of the representations,
warranties, covenants or obligations of Parent contained in this Agreement.

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SECTION 5.  ADDITIONAL COVENANTS OF THE PARTIES

     5.1  REGISTRATION STATEMENT; JOINT PROSPECTUS/PROXY STATEMENT.

     (a) As promptly as practicable after the date of this Agreement, Parent and
the Company shall prepare and cause to be filed with the SEC the Joint
Prospectus/Proxy Statement and Parent shall prepare and cause to be filed with
the SEC the Form S-4 Registration Statement, in which the Joint Prospectus/Proxy
Statement will be included as a prospectus. Each of Parent and the Company shall
use commercially reasonable efforts to cause the Form S-4 Registration Statement
and the Joint Prospectus/ Proxy Statement to comply with the rules and
regulations promulgated by the SEC, to respond promptly to any comments of the
SEC or its staff and to have the Form S-4 Registration Statement declared
effective under the Securities Act as promptly as practicable after it is filed
with the SEC. The Company and Parent will use commercially reasonable efforts to
cause the Joint Prospectus/Proxy Statement to be mailed to their respective
stockholders as promptly as practicable after the Form S-4 Registration
Statement is declared effective under the Securities Act. Parent and the Company
shall promptly furnish to the other information concerning Parent or the Company
or their respective stockholders that may be required or reasonably requested in
connection with any action contemplated by this Section 5.1. If any event
relating to any of the Acquired Corporations or Parent occurs, or if either
party becomes aware of any information that should be disclosed in an amendment
or supplement to the Form S-4 Registration Statement or the Joint
Prospectus/Proxy Statement, then such party shall promptly inform the other
party thereof and shall cooperate in filing such amendment or supplement with
the SEC and, if appropriate, in mailing such amendment or supplement to the
stockholders of the Company or Parent.

     (b) Prior to the Effective Time, Parent shall use commercially reasonable
efforts to obtain all regulatory approvals needed to ensure that the Parent
Common Stock to be issued in the Merger will be registered or qualified under
the securities law of every jurisdiction of the United States in which any
registered holder of Company Common Stock has an address of record on the record
date for determining the stockholders entitled to notice of and to vote at the
Company Stockholders' Meeting; provided, however, that Parent shall not be
required (i) to qualify to do business as a foreign corporation in any
jurisdiction in which it is not now qualified or (ii) to file a general consent
to service of process in any jurisdiction.

     5.2  COMPANY STOCKHOLDERS' MEETING.

     (a) The Company shall take all action necessary under all applicable Legal
Requirements to call, give notice of, convene and hold a meeting of the holders
of their Common Stock to consider, act upon and vote upon the adoption and
approval of this Agreement and the approval of the Merger (the "COMPANY
STOCKHOLDERS' MEETING"). The Company Stockholders' Meeting will be held as
promptly as practicable after the Form S-4 Registration Statement is declared
effective under the Securities Act; provided, however, that notwithstanding
anything to the contrary contained in this Agreement, the Company may adjourn or
postpone the Company Stockholder's Meeting to the extent necessary to ensure
that any necessary supplement or amendment to the Joint Proxy
Statement/Prospectus is provided to the Company's stockholders in advance of a
vote on the Merger Agreement and the Merger or, if as of the time for which the
Company Stockholders' Meeting is originally scheduled (as set forth in the Joint
Proxy Statement/Prospectus) there are insufficient shares of Company Common
Stock represented (either in person or by proxy) to constitute a quorum
necessary to conduct the business of the Company Stockholders' Meeting. The
Company and Parent shall cooperate in attempting to cause the Company
Stockholders' Meeting to be scheduled and convened on the same date as the
Parent Stockholders' Meeting (as defined in Section 5.3 below) shall be
scheduled and convened. The Company shall ensure that the Company Stockholders'
Meeting is called, noticed, convened, held and conducted, and that all proxies
solicited in connection with such Company Stockholders' Meeting are solicited,
in compliance with all applicable Legal Requirements. The Company's obligation
to call, give notice of, convene and hold its respective Stockholders' Meeting
in accordance with this Section 5.2(a)shall not be limited or otherwise affected
by the commencement, disclosure, announcement or submission of any Superior
Offer or other

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Acquisition Proposal, or by any withdrawal, amendment or modification of the
recommendation of the board of directors of either Company with respect to the
Merger.

     (b) Subject to Section 5.2(c): (i) the board of directors of the Company
shall unanimously recommend that the Company's stockholders vote in favor of and
adopt and approve this Agreement and approve the Merger at the Company
Stockholders' Meeting; (ii) the Joint Prospectus/Proxy Statement shall include a
statement to the effect that the board of directors of the Company has
unanimously recommended that the Company's stockholders vote in favor of and
adopt and approve this Agreement and approve the Merger at the Company
Stockholders' Meeting; and (iii) neither the board of directors of the Company
nor any committee thereof shall withdraw, amend or modify, or propose or resolve
to withdraw, amend or modify, in a manner adverse to Parent, the unanimous
recommendation of the board of directors of the Company that the Company's
stockholders vote in favor of and adopt and approve this Agreement and approve
the Merger. For purposes of this Agreement, said recommendation of the board of
directors of the Company shall be deemed to have been modified in a manner
adverse to Parent if said recommendation shall no longer be unanimous.

     (c) Nothing in Section 5.2(b) shall prevent the board of directors of the
Company from withdrawing, amending or modifying its unanimous recommendation in
favor of the Merger at any time prior to the adoption and approval of this
Agreement by the Required Company Stockholder Vote if (i) a Superior Offer is
made to the Company and is not withdrawn, (ii) neither the Company nor any of
its Representatives shall have violated any of the restrictions set forth in
Section 4.3, (iii) the board of directors of the Company concludes in good
faith, after consultation with its outside counsel, that, in light of such
Superior Offer, it would be inconsistent with the fiduciary obligations of the
board of directors of the Company to the Company's stockholders under applicable
law not to withdraw, amend or modify such recommendation, (iv) the Company
provides Parent with at least 24 hours prior notice of any meeting of the
Company's board of directors at which such board of directors is expected to
consider such Superior Offer, and (v) the Company's board of directors does not
withdraw, amend or modify its unanimous recommendation in favor of the Merger
for at least 48 hours after the Company provides Parent with the name of the
Person making such Superior Offer and a copy of such Superior Offer. Nothing
contained in this Section 5.2 shall limit the Company's obligation to call, give
notice of, convene and hold the Company Stockholders' Meeting (regardless of
whether the unanimous recommendation of the board of directors of the Company
shall have been withdrawn, amended or modified).

     5.3  PARENT STOCKHOLDERS' MEETING.

     (a) Parent shall take all action necessary to call, give notice of, convene
and hold a meeting of the holders of Parent Common Stock to consider and vote
upon the issuance of Parent Common Stock in the Merger and, to the extent
required under Parent's certificate of incorporation and bylaws and applicable
law, the election of Lev J. Leytes to Parent's Board of Directors (the "PARENT
STOCKHOLDERS' MEETING"). The Parent Stockholders' Meeting will be held as
promptly as practicable after the S-4 Registration Statement is declared
effective under the Securities Act; provided, however, that notwithstanding
anything to the contrary contained in this Agreement, Parent may adjourn or
postpone the Parent Stockholders' Meeting to the extent necessary to ensure that
any necessary supplement or amendment to the Joint Proxy Statement/Prospectus is
provided to Parent's stockholders in advance of a vote on the issuance of Parent
Common Stock in the Merger or, if as of the time for which the Parent
Stockholders' Meeting is originally scheduled (as set forth in the Joint Proxy
Statement/Prospectus) there are insufficient shares of Parent Common Stock
represented (either in person or by proxy) to constitute a quorum necessary to
conduct the business of the Parent's Stockholders' Meeting. Parent shall ensure
that the Parent Stockholders' Meeting is called, noticed, convened, held and
conducted, and that all proxies solicited in connection with such Parent
Stockholders' Meeting are solicited, in compliance with all applicable Legal
Requirements.

     (b) (i) The board of directors of Parent shall unanimously recommend that
Parent's stockholders vote in favor of the issuance of Parent Common Stock in
the Merger and the election of Lev J. Leytes to Parent's Board of Directors at
the Parent Stockholders' Meeting; (ii) the Joint Prospectus/Proxy

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Statement shall include a statement to the effect that the board of directors of
Parent has unanimously recommended that Parent's stockholders vote in favor of
the issuance of shares of Parent Common Stock in the Merger and the election of
Lev. J. Leytes to Parent's Board of Directors at Parent's Stockholders' Meeting;
and (iii) neither the board of directors of Parent nor any committee thereof
shall withdraw, amend or modify, or propose or resolve to withdraw, amend or
modify, in a manner adverse the Company, the unanimous recommendation of the
board of directors of Parent that Parent's stockholders vote in favor of the
issuance of Parent Common Stock in the Merger and the election of Lev J. Leytes
to Parent's Board of Directors. For purposes of this Agreement, said
recommendation of the board of directors of Parent shall be deemed to have been
modified in a manner adverse to the Company if said recommendation shall no
longer be unanimous.

     5.4  REGULATORY APPROVALS.  Each party shall use commercially reasonable
efforts to file, as promptly as practicable after the date of this Agreement,
all notices, reports and other documents required to be filed by such party with
any Governmental Body with respect to the Merger and the other transactions
contemplated by this Agreement, and to submit promptly any additional
information requested by any such Governmental Body. Without limiting the
generality of the foregoing, the Company and Parent shall, promptly after the
date of this Agreement, prepare and file the notifications required under the
HSR Act, if any, in connection with the Merger. The Company and Parent shall
respond as promptly as practicable to (i) any inquiries or requests received
from the Federal Trade Commission or the Department of Justice for additional
information or documentation and (ii) any inquiries or requests received from
any state attorney general or other Governmental Body in connection with
antitrust or related matters. Each of the Company and Parent shall (1) give the
other party prompt notice of the commencement of any Legal Proceeding by or
before any Governmental Body with respect to the Merger or any of the other
transactions contemplated by this Agreement, (2) keep the other party informed
as to the status of any such Legal Proceeding, and (3) promptly inform the other
party of any communication to or from the Federal Trade Commission, the
Department of Justice or any other Governmental Body regarding the Merger. The
Company and Parent will consult and cooperate with one another, and will
consider in good faith the views of one another, in connection with any
analysis, appearance, presentation, memorandum, brief, argument, opinion or
proposal made or submitted in connection with any Legal Proceeding under or
relating to the HSR Act or any other federal or state antitrust or fair trade
law. In addition, except as may be prohibited by any Governmental Body or by any
Legal Requirement, in connection with any Legal Proceeding under or relating to
the HSR Act or any other federal or state antitrust or fair trade law or any
other similar Legal Proceeding, each of the Company and Parent will permit
authorized Representatives of the other party to be present at each meeting or
conference relating to any such Legal Proceeding and to have access to and be
consulted in connection with any document, opinion or proposal made or submitted
to any Governmental Body in connection with any such Legal Proceeding.

     5.5  STOCK OPTIONS AND WARRANTS.

     (a) Subject to Section 5.5(b), at the Effective Time, all rights with
respect to Company Common Stock under each Company Option then outstanding shall
be converted into and become rights with respect to Parent Common Stock, and
Parent shall assume each such Company Option in accordance with the terms (as in
effect as of the date of this Agreement) of the stock option plan under which it
was issued, the stock option agreement by which it is evidenced and any
applicable Change of Control Agreement. At the Effective Time, all rights with
respect to Company Common Stock under each Company Warrant then outstanding
shall be converted into and become rights to Parent Common Stock, and Parent
shall assume each such Company Warrant in accordance with the terms (as in
effect as of the date of this Agreement) of the Company Warrant and any warrant
agreement by which it is evidenced. From and after the Effective Time, (i) each
Company Option and Company Warrant assumed by Parent may be exercised solely for
shares of Parent Common Stock, (ii) the number of shares of Parent Common Stock
subject to each such Company Option and Company Warrant shall be equal to the
number of shares of Company Common Stock subject to such Company Option and
Company Warrant immediately prior to the Effective Time multiplied by the
Exchange Ratio, rounding down to the nearest whole share, (iii) the per share
exercise price under each such Company Option and Company Warrant shall be

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<PAGE>   151

adjusted by dividing the per share exercise price under such Company Option and
Company Warrant by the Exchange Ratio and rounding up to the nearest cent and
(iv) any restriction on the exercise of any such Company Option and Company
Warrant shall continue in full force and effect and the term, exercisability,
vesting schedule and other provisions of such Company Option and Company Warrant
shall otherwise remain unchanged; provided, however, that each Company Option
and Company Warrant assumed by Parent in accordance with this Section 5.5(a)
shall, in accordance with its terms, be subject to further adjustment as
appropriate to reflect any stock split, division or subdivision of shares, stock
dividend, reverse stock split, consolidation of shares, reclassification,
recapitalization or other similar transaction subsequent to the Effective Time.
It is the intention of the parties that the Company Options assumed by Parent
qualify following the Effective Time as incentive stock options as defined in
Section 422 of the Code to the extent such Company Options qualified as
incentive stock options prior to the Effective Time. Parent shall file with the
SEC, within 7 days after the date on which the Merger becomes effective, a
registration statement on Form S-8 relating to the shares of Parent Common Stock
issuable with respect to the Company Options assumed by Parent in accordance
with this Section 5.5(a). Parent shall use commercially reasonable efforts to
maintain the effectiveness of such registration statement (and maintain the
current status of the prospectus contained in such registration statement) for
so long as the Company Options remain outstanding. As soon as practicable after
the Effective Time (but in no event later than 30 days thereafter), Parent shall
deliver to each holder of a Company Option or Company Warrant an appropriate
notice setting forth such holder's rights with respect to such Company Option or
Company Warrant and indicating that such Company Option or Company Warrant shall
continue in effect on the same terms and conditions as were in effect
immediately prior to the Effective Time (subject to the adjustments required
pursuant to Section 5.5(a)).

     (b) Notwithstanding anything to the contrary contained in this Section 5.5,
in lieu of assuming outstanding Company Options in accordance with Section
5.5(a), Parent may, at its election, cause such outstanding Company Options to
be replaced by issuing reasonably equivalent replacement stock options in
substitution therefor ("REPLACEMENT OPTIONS"). The vesting schedule of any
Replacement Option shall be the same as that of the option being replaced. The
number of shares of Parent Common Stock subject to a Replacement Option, as well
as the per share exercise price of such Replacement Option, shall be determined
in the manner specified in Section 5.5(a). If Parent elects to substitute
Replacement Options in lieu of assuming outstanding Company Options, Parent
shall take all corporate action necessary to approve the Replacement Options
described in this Section 5.5(b) in a manner qualifying under Section 424(a) of
the Code and to grant options that qualify as incentive stock options under
Section 422 of the Code (to the extent such Company Options qualified as
incentive stock options prior to the Effective Time) and shall deliver an
agreement evidencing such Replacement Options to each applicable holder of a
Company Option within 30 days after the Effective Time. Shares of Parent Common
Stock issuable pursuant to the Replacement Options granted pursuant to this
Section 5.5(b) shall be registered on the Form S-8 Registration Statement
referred to in Section 5.5(a). Parent shall use commercially reasonable efforts
to maintain the effectiveness of such registration statement (and maintain the
current status of the prospectus contained in such registration statement) for
so long as the Replacement Options remain outstanding.

     (c) The Company shall take all action that may be necessary (under the
plans pursuant to which Company Options are outstanding and otherwise) to
effectuate the provisions of this Section 5.5 and to ensure that, from and after
the Effective Time, holders of Company Options have no rights with respect
thereto other than those specifically provided in this Section 5.5. The parties
intend that the assumption or replacement of Company options provided for under
this Section 5.5 shall comply with the provisions of Section 424(a) of the Code,
and this Section 5.5 shall be interpreted consistent with such intent.

     (d) As of the Effective Time, the ESPP shall be terminated. The rights of
participants in the ESPP with respect to any offering period then underway under
the ESPP shall be determined by treating the last business day prior to the
Effective Time as the last day of such offering period and by making such other
pro-rata adjustments as may be required pursuant to the ESPP to reflect the
reduced offering period but otherwise treating such offering period as a fully
effective and completed offering period for all purposes of

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<PAGE>   152

such Plan. Prior to the Effective Time, the Company shall take all actions that
are necessary to give effect to the transactions contemplated by this Section
5.5(d); provided, however, that the change in the offering period referred to in
this Section 5.5(d) shall be conditioned upon the consummation of the Merger.

     5.6  EMPLOYEE BENEFITS.  Parent agrees that all employees of the Company
who continue employment with Parent or the Company after the Effective Time
shall be eligible to participate in Parent's health, vacation and other employee
benefit plans, to the same extent as employees of Parent in similar positions
and at similar grade levels (it being understood that such employees shall be
eligible to begin to participate (i) in Parent's employee stock purchase plan
upon the commencement of the first new offering period that commences following
the Effective Time, and (ii) in Parent's other employee benefit plans in
accordance with the terms of such plans; provided, however, that in the case of
plans for which the Company maintains a plan offering the same type of benefit,
such eligibility need not be offered by Parent until the corresponding plan of
the Company ceases to be available after the Effective Time). As soon as
administratively feasible following the Effective Time, Parent agrees to take
whatever action is necessary to transition Company employees into Parent's
employee benefits plans as contemplated by the first sentence of this Section
5.6. Further, until such time that the continuing Company employees are covered
under an employee benefit plan of Parent, they shall continue to be covered
under the corresponding Company Plan that offers the same type of benefit.
Parent also agrees to provide each such continuing employee with full credit for
service as an employee of the Company or any affiliate thereof prior to the
Effective Time for the following purposes only: for purposes of eligibility,
vesting and determination of the level of benefits (without duplication) under
any employee benefit plan or arrangement maintained by Parent, including
Parent's 401(k) plan, and for Parent's vacation program. To the extent
practicable and only if permitted by the relevant insurance carrier, Parent
shall administer its medical plan ("PARENT MEDICAL PLAN") so as to coordinate
deductibles, "out-of-pocket" maximums and maximum benefit restrictions so that:
(A) Company employees receive credit under the Parent Medical Plan toward any
deductibles under the Parent Medical Plan for deductibles paid under any of the
medical, dental and prescription drug plans included within the Company Plans
("Company Medical Plan") on or prior to the Effective Time which, had the
Company employees been covered by the Parent Medical Plan, would have been taken
into account by the Parent Medical Plan, (B) Company employees receive credit
for their eligible out-of-pocket costs with respect to eligible claims incurred
under the Company Medical Plan which, had the Company employees been covered by
the Parent Medical Plan, would have been taken into account under the Parent
Medical Plan toward any "out-of-pocket" maximums under the Parent Medical Plan,
and (C) Company employees are credited with benefits received under the Company
Medical Plan on or prior to the Effective Time which, had the Company employees
been covered by the Parent Medical Plan, would have been taken into account by
the Parent Medical Plan for purposes of applying the maximum benefit
restrictions under the Parent Medical Plan. Notwithstanding the foregoing, to
the extent permitted by law, Parent reserves the right to enforce, on a
nondiscriminatory basis, any otherwise applicable pre-existing condition
limitation under its medical plan with respect to any Company employee who does
not enroll in Parent's medical plan at the time Parent's medical plan is first
made available to such Company employee.

     5.7  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

     (a) All rights to indemnification existing in favor of those Persons who
are directors and officers of the Company as of the date of this Agreement (the
"INDEMNIFIED PERSONS") for acts and omissions occurring prior to the Effective
Time, as provided in the Company's Bylaws (as in effect as of the date of this
Agreement) and as provided in the indemnification agreements between the Company
and said Indemnified Persons (as in effect as of the date of this Agreement),
shall survive the Merger and shall be observed by the Surviving Corporation to
the fullest extent available under Delaware law for a period of five years from
the Effective Time.

     (b) From the Effective Time until the fifth anniversary of the Effective
Time, the Surviving Corporation shall maintain in effect, for the benefit of the
Indemnified Persons with respect to acts or omissions occurring prior to the
Effective Time, the existing policy of directors' and officers' liability
insurance maintained by the Company as of the date of this Agreement (the
"EXISTING POLICY"); provided,
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<PAGE>   153

however, that (i) the Surviving Corporation may substitute for the Existing
Policy a policy or policies of comparable coverage, and (ii) the Surviving
Corporation shall not be required to pay an annual premium for the Existing
Policy (or for any substitute policies) in excess of $75,000. In the event any
future annual premium for the Existing Policy (or any substitute policies)
exceeds $75,000, the Surviving Corporation shall be entitled to reduce the
amount of coverage of the Existing Policy (or any substitute policies) to the
amount of coverage that can be obtained for a premium equal to $75,000.

     (c) If the Surviving Corporation does not have sufficient capital to comply
with its obligations under Section 5.6, Parent shall provide the Surviving
Corporation with such capital.

     (d) This Section shall survive the consummation of the Merger, is intended
to benefit the indemnified parties, shall be binding upon all successors and
assigns of the Surviving Corporation and Parent and shall be enforceable by the
indemnified parties.

     5.8  POOLING OF INTERESTS.  Each of the Company and Parent agrees (and the
Company agrees to cause the Acquired Corporations) (a) not knowingly to take any
action during the Pre-Closing Period that would adversely affect the ability of
Parent to account for the Merger as a "pooling of interests," and (b) to use
commercially reasonable efforts to attempt to ensure that none of its
"affiliates" (as that term is used in Rule 145 under the Securities Act) takes
any action that could adversely affect the ability of Parent to account for the
Merger as a "pooling of interests." The Company and Parent each agrees to
provide to PricewaterhouseCoopers LLP and Ernst & Young LLP such letters as
shall be reasonably requested of either of them with respect to the letters
referred to in Sections 6.6(f) and 6.6(g).

     5.9  ADDITIONAL AGREEMENTS.

     (a) Subject to Section 5.9(b), Parent and the Company shall use
commercially reasonable efforts to take, or cause to be taken, all actions
necessary to effectuate the Merger and make effective the other transactions
contemplated by this Agreement. Without limiting the generality of the
foregoing, but subject to Section 5.9(b), each party to this Agreement (i) shall
make all filings (if any) and give all notices (if any) required to be made and
given by such party in connection with the Merger and the other transactions
contemplated by this Agreement, (ii) shall use commercially reasonable efforts
to obtain each Consent (if any) required to be obtained (pursuant to any
applicable Legal Requirement or Contract, or otherwise) by such party in
connection with the Merger or any of the other transactions contemplated by this
Agreement, and (iii) shall use commercially reasonable efforts to lift any
restraint, injunction or other legal bar to the Merger. The Company shall
promptly deliver to Parent a copy of each such filing made, each such notice
given and each such Consent obtained by the Company during the Pre-Closing
Period.

     (b) Notwithstanding anything to the contrary contained in this Agreement,
Parent shall not have any obligation under this Agreement: (i) to dispose or
transfer or cause any of its Subsidiaries to dispose of or transfer any assets,
or to commit to cause any of the Acquired Corporations to dispose of any assets;
(ii) to discontinue or cause any of its Subsidiaries to discontinue offering any
product or service, or to commit to cause any of the Acquired Corporations to
discontinue offering any product or service; (iii) to license or otherwise make
available, or cause any of its Subsidiaries to license or otherwise make
available, to any Person, any technology, software or other Intellectual
Property, or to commit to cause any of the Acquired Corporations to license or
otherwise make available to any Person any technology, software or other
Intellectual Property; (iv) to hold separate or cause any of its Subsidiaries to
hold separate any assets or operations (either before or after the Closing
Date), or to commit to cause any of the Acquired Corporations to hold separate
any assets or operations; or (v) to make or cause any of its Subsidiaries to
make any commitment (to any Governmental Body or otherwise) regarding its future
operations or the future operations of any of the Acquired Corporations.

     5.10  DISCLOSURE.  Parent and the Company shall consult with each other
before issuing any press release or otherwise making any public statement with
respect to the Merger or any of the other transactions contemplated by this
Agreement. Without limiting the generality of the foregoing, the Company shall
not, and shall not permit any of its Subsidiaries or any Representative of any
of the Acquired Corporations to, make any disclosure regarding the Merger or any
of the other transactions

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contemplated by this Agreement unless (a) Parent shall have approved such
disclosure or (b) the Company shall have been advised by its outside legal
counsel that such disclosure is required by applicable law.

     5.11  AFFILIATE AGREEMENTS.  The Company shall use commercially reasonable
efforts to cause each Person identified in Part 2.20 of the Company Disclosure
Schedule and each other Person who is or becomes (or may be deemed to be) an
"affiliate" (as that term is used in Rule 145 under the Securities Act) of the
Company to execute and deliver to Parent, prior to the date of the mailing of
the Joint Prospectus/Proxy Statement to the Company's stockholders, an Affiliate
Agreement in the form of Exhibit B. The Parent shall use commercially reasonable
efforts to cause each Person who is or becomes (or may be deemed to be) an
"affiliate" (as that term is used in Rule 145 under the Securities Act) of the
Parent to execute and deliver to the Company, prior to the date of mailing of
the Joint Prospectus/ Proxy Statement to Parent's stockholders, an affiliate
agreement of substantially the scope of Exhibit B hereto, to the extent
applicable to "affiliates" of Parent.

     5.12  TAX MATTERS.  At or prior to the filing of the Form S-4 Registration
Statement, the Company, Merger Sub and Parent shall execute and deliver to
Cooley Godward LLP and to Venture Law Group, A Professional Corporation, tax
representation letters in customary form to the extent the matters addressed in
such letters are factually accurate. Parent, Merger Sub and the Company shall
each confirm to Cooley Godward LLP and to Venture Law Group the accuracy and
completeness as of the Effective Time of the tax representation letters
delivered pursuant to the immediately preceding sentence. Parent and the Company
shall use commercially reasonable efforts prior to the Effective Time to cause
the Merger to qualify as a tax free reorganization under Section 368(a)(1) of
the Code. Following delivery of the tax representations letters pursuant to the
first sentence of this Section 5.12, each of Parent and the Company shall use
its commercially reasonable efforts to cause Cooley Godward LLP and Venture Law
Group, respectively, to deliver to it a tax opinion satisfying the requirements
of Item 601 of Regulation S-K promulgated under the Securities Act. In rendering
such opinions, each of such counsel shall be entitled to rely on the tax
representation letters referred to in this Section 5.12. The parties hereto
shall report the Merger as a reorganization within the meaning of Section 368(a)
of the Code, and neither Parent, Merger Sub nor the Company shall take any
action or fail to take any action prior to or following the Closing that would
reasonably be expected to cause the Merger to fail to qualify as a
reorganization.

     5.13  LETTER OF THE COMPANY'S INDEPENDENT ACCOUNTANTS.  The Company shall
use commercially reasonable efforts to cause to be delivered to Parent and the
Company a "comfort" letter prepared by PricewaterhouseCoopers LLP in accordance
with Statement of Auditing Standards No. 72 "Letters For Underwriters and
Certain Other Requesting Parties," subject to receipt by PricewaterhouseCoopers
LLP of a customary representation letter from Parent, dated no more than two
business days before the date on which the Form S-4 Registration Statement
becomes effective (and reasonably satisfactory in form and substance to Parent
and the Company), that is customary in scope and substance for "comfort" letters
delivered by independent accountants in connection with registration statements
similar to the Form S-4 Registration Statement.

     5.14  LISTING.  Parent shall use commercially reasonable efforts to cause
the shares of Parent Common Stock being issued in the Merger to be approved for
listing as of the Effective Time (subject to notice of issuance) on the Nasdaq
National Market.

     5.15  RESIGNATION OF OFFICERS AND DIRECTORS.  The Company shall use
commercially reasonable efforts to obtain and deliver to Parent on or prior to
the Closing the resignation of each officer and director from positions as an
officer and director of each of the Acquired Corporations (it being understood
that such resignations by officers of the Company whose employment with the
Company or Parent following the Effective Time shall be continuing shall not
constitute a voluntary or an "Involuntary Termination" under the Change of
Control Agreements and shall not effect in any manner any rights of any officer
of the Company or any of the Company's obligations under the Change of Control
Agreements).

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     5.16  TERMINATION OF 401(K) PLAN.  To the extent requested by Parent, the
Company shall ensure that its 401(k) Savings and Retirement Plan and ESPP shall
be terminated immediately prior to the Effective Time.

     5.17  PARENT BOARD OF DIRECTORS.  Parent shall use commercially reasonable
efforts to cause Lev J. Leytes to be elected to Parent's Board of Directors as
of the Effective Time.

SECTION 6.  CONDITIONS PRECEDENT TO OBLIGATIONS OF PARENT AND MERGER SUB

     The obligations of Parent and Merger Sub to effect the Merger and otherwise
consummate the transactions contemplated by this Agreement are subject to the
satisfaction, at or prior to the Closing, of each of the following conditions:

     6.1  ACCURACY OF REPRESENTATIONS.  The representations and warranties of
the Company contained in this Agreement (i) shall have been accurate in all
material respects as of the date of this Agreement and (ii) shall be accurate in
all respects as of the Closing Date as if made on and as of the Closing Date
except in the case of clause (ii): (A) for such inaccuracies as do not
constitute a Material Adverse Effect on the Acquired Corporations, (B) for
changes contemplated by this Agreement, and (C) for those representations and
warranties that address matters only as of a particular date (which
representations and warranties shall have been accurate as of such date except
as does not constitute a Material Adverse Effect on the Acquired Corporations as
of such particular date) (it being understood that, for purposes of determining
the accuracy of such representations and warranties as of the date hereof and as
of the Closing Date, (i) all "Material Adverse Effect" qualifications and other
materiality qualifications contained in such representations and warranties
shall be disregarded and (ii) any update of or modification to the Company
Disclosure Schedule made or purported to have been made after the date of this
Agreement shall be disregarded).

     6.2  PERFORMANCE OF COVENANTS.  Each covenant or obligation that the
Company is required to comply with or to perform at or prior to the Closing
shall have been complied with and performed in all material respects.

     6.3  EFFECTIVENESS OF REGISTRATION STATEMENT.  The Form S-4 Registration
Statement shall have become effective in accordance with the provisions of the
Securities Act, and no stop order shall have been issued by the SEC with respect
to the Form S-4 Registration Statement.

     6.4  STOCKHOLDER APPROVAL.  This Agreement shall have been duly adopted and
approved, and the Merger shall have been duly approved, by the Required Company
Stockholder Vote and the Required Parent Stockholder Vote. The holders of not
more than 5% of the shares of the Company's Common Stock shall have exercised
dissenters' rights pursuant to Chapter 13 of the California Corporations Code.

     6.5  CONSENTS.  All Consents required to be obtained in connection with the
Merger and the other transactions contemplated by this Agreement shall have been
obtained and shall be in full force and effect, except where the failure to
obtain such Consents would not reasonably be expected to have a Material Adverse
Effect on the Acquired Corporations.

     6.6  AGREEMENTS AND DOCUMENTS.  Parent shall have received the following
agreements and documents, each of which shall be in full force and effect:

          (a) Affiliate Agreements in the form of Exhibit B, executed by each
     Person who could reasonably be deemed to be an "affiliate" of the Company
     (as that term is used in Rule 145 under the Securities Act);

          (b) Reserved;

          (c) Release in the form of Exhibit C, executed by Lev J. Leytes;

          (d) Noncompetition Agreement in the form of Exhibit D, executed by Lev
     J. Leytes;

                                      A-43
<PAGE>   156

          (e) a letter from PricewaterhouseCoopers LLP, dated as of the Closing
     Date and addressed to Parent and the Company, reasonably satisfactory in
     form and substance to Parent, updating the "comfort" letter referred to in
     Section 5.13;

          (f) a letter from PricewaterhouseCoopers LLP, dated as of the Closing
     Date and addressed to the Company, reasonably satisfactory in form and
     substance to Parent and Ernst & Young LLP, to the effect that, after
     reasonable investigation, PricewaterhouseCoopers LLP is not aware of any
     fact concerning the Acquired Corporations or any of the stockholders or
     affiliates of the Acquired Corporations that could preclude the Company
     from being a "poolable entity" in accordance with generally accepted
     accounting principles, Accounting Principles Board Opinion No. 16 and all
     published rules, regulations and policies of the SEC;

          (g) a letter from Ernst & Young LLP, dated as of the Closing Date and
     addressed to Parent, reasonably satisfactory in form and substance to
     Parent, to the effect that Ernst & Young LLP concurs with Parent's
     management's conclusion that the Merger may be accounted for as a "pooling
     of interests" in accordance with generally accepted accounting principles,
     Accounting Principles Board Opinion No. 16 and all published rules,
     regulations and policies of the SEC;

          (h) a legal opinion of Cooley Godward LLP dated as of the Closing Date
     and addressed to Parent, to the effect that the Merger will constitute a
     reorganization within the meaning of Section 368 of the Code (it being
     understood that, in rendering such opinion, Cooley Godward LLP may rely
     upon the tax representation letters referred to in Section 5.12);

          (i) a certificate executed on behalf of the Company by its Chief
     Executive Officer confirming that the conditions set forth in Sections 6.1,
     6.2, 6.4 (with respect to the Required Company Vote exercise of dissenters'
     rights only) and 6.5 have been duly satisfied; and

          (j) the written resignations of all officers and directors from
     positions as an officer and director of each of the Acquired Corporations
     effective as of the Effective Time (it being understood that such
     resignations by officers of the Company whose employment with the Company
     or Parent following the Effective Time shall be continuing shall not
     constitute a voluntary or an "Involuntary Termination" under the Change of
     Control Agreements and shall not effect in any manner any rights of any
     officer of the Company or any of the Company's obligations under the Change
     of Control Agreements).

     6.7  HSR ACT.  All waiting periods, if any, under the HSR Act relating to
the transactions contemplated hereby will have expired or terminated early and
all material foreign antitrust approval required to be obtained prior to the
Merger in connection with the transactions contemplated hereby shall have been
obtained.

     6.8  RESERVED.

     6.9  RESERVED.

     6.10  LISTING.  The shares of Parent Common Stock to be issued in the
Merger shall have been approved for listing (subject to notice of issuance) on
the Nasdaq National Market.

     6.11  NO RESTRAINTS.  No temporary restraining order, preliminary or
permanent injunction or other order preventing the consummation of the Merger
shall have been issued by any court of competent jurisdiction and remain in
effect, and there shall not be any Legal Requirement enacted or deemed
applicable to the Merger that makes consummation of the Merger illegal.

     6.12  NO GOVERNMENTAL LITIGATION.  There shall not be pending or overtly
threatened any Legal Proceeding in which a Governmental Body is or is overtly
threatened to become a party or is otherwise involved, and neither Parent nor
the Company shall have received any communication from any Governmental Body in
which such Governmental Body indicates the probability of commencing any Legal
Proceeding or taking any other action: (a) challenging or seeking to restrain or
prohibit the consummation of the Merger; (b) relating to the Merger and seeking
to obtain from Parent or any of its Subsidiaries, or any of the Acquired
Corporations, any damages or other relief that would be material to Parent;

                                      A-44
<PAGE>   157

(c) seeking to prohibit or limit in any material respect Parent's ability to
vote, receive dividends with respect to or otherwise exercise ownership rights
with respect to the stock of any of the Acquired Corporations; or (d) which
would materially and adversely affect the right of Parent or any of the Acquired
Corporations to own the assets or operate the business of the Acquired
Corporations.

     6.13  NO OTHER LITIGATION.  There shall not be pending any Legal Proceeding
in which there is a reasonable likelihood of an outcome that would have a
Material Adverse Effect on the Acquired Corporations or a Material Adverse
Effect on Parent: (a) challenging or seeking to restrain or prohibit the
consummation of the Merger or any of the other transactions contemplated by this
Agreement; (b) relating to the Merger and seeking to obtain from Parent or any
of its Subsidiaries, or any of the Acquired Corporations, any damages or other
relief that would be material to Parent; or (c) seeking to prohibit or limit in
any material respect Parent's ability to vote, receive dividends with respect to
or otherwise exercise ownership rights with respect to the stock of any of the
Acquired Corporations.

SECTION 7.  CONDITIONS PRECEDENT TO OBLIGATION OF THE COMPANY

     The obligation of the Company to effect the Merger and otherwise consummate
the transactions contemplated by this Agreement are subject to the satisfaction,
at or prior to the Closing, of the following conditions:

     7.1  ACCURACY OF REPRESENTATIONS.  The representations and warranties of
Parent and Merger Sub contained in this Agreement (i) shall have been accurate
in all material respects as of the date of this Agreement and (ii) shall be
accurate in all respects as of the Closing Date as if made on and as of the
Closing Date except in the case of clause (ii): (A) for such inaccuracies as do
not constitute a Material Adverse Effect on Parent or Merger Sub, (B) for
changes contemplated by this Agreement, and (C) for those representations and
warranties that address matters only as of a particular date (which
representations and warranties shall have been accurate as of such date except
as does not constitute a Material Adverse Effect on Parent or Merger Sub as of
such particular date) (it being understood that, for purposes of determining the
accuracy of such representations and warranties as of the date hereof and as of
the Closing Date, all "Material Adverse Effect" qualifications and other
materiality qualifications contained in such representations and warranties
shall be disregarded).

     7.2  PERFORMANCE OF COVENANTS.  All of the covenants and obligations that
Parent and Merger Sub are required to comply with or to perform at or prior to
the Closing shall have been complied with and performed in all material
respects.

     7.3  EFFECTIVENESS OF REGISTRATION STATEMENT.  The Form S-4 Registration
Statement shall have become effective in accordance with the provisions of the
Securities Act, and no stop order shall have been issued by the SEC with respect
to the Form S-4 Registration Statement.

     7.4  STOCKHOLDER APPROVAL.  This Agreement shall have been duly adopted and
approved, and the Merger shall have been duly approved, by the Required Company
Stockholder Vote and the Required Parent Stockholder Vote.

     7.5  DOCUMENTS.  The Company shall have received the following documents:

          (a) a legal opinion of Venture Law Group, dated as of the Closing
     Date, to the effect that the Merger will constitute a reorganization within
     the meaning of Section 368 of the Code (it being understood that, in
     rendering such opinion, Venture Law Group may rely upon the tax
     representation letters referred to in Section 5.12); and

          (b) a certificate executed on behalf of Parent by an executive officer
     of Parent, confirming that conditions set forth in Sections 7.1, 7.2 and
     7.4 (with respect to the Required Parent Stockholder Vote) have been duly
     satisfied.

     7.6  HSR ACT.  All waiting periods, if any, under the HSR Act relating to
the transactions contemplated hereby will have expired or terminated early and
all material foreign antitrust approval

                                      A-45
<PAGE>   158

required to be obtained prior to the Merger in connection with the transactions
contemplated hereby shall have been obtained.

     7.7  LISTING.  The shares of Parent Common Stock to be issued in the Merger
shall have been approved for listing (subject to notice of issuance) on the
Nasdaq National Market.

     7.8  NO RESTRAINTS.  No temporary restraining order, preliminary or
permanent injunction or other order preventing the consummation of the Merger by
the Company shall have been issued by any court of competent jurisdiction and
remain in effect, and there shall not be any Legal Requirement enacted or deemed
applicable to the Merger that makes consummation of the Merger by the Company
illegal.

     7.9  NO GOVERNMENTAL LITIGATION.  There shall not be pending or overtly
threatened any Legal Proceeding in which a Governmental Body is or is overtly
threatened to become a party or is otherwise involved, and neither Parent nor
the Company shall have received any communication from any Governmental Body in
which such Governmental Body indicates the probability of commencing any Legal
Proceeding or taking any other action: (a) challenging or seeking to restrain or
prohibit the consummation of the Merger; (b) relating to the Merger and seeking
to obtain from Parent or any of its Subsidiaries, or any of the Acquired
Corporations, any damages or other relief that would be material to Parent; (c)
seeking to prohibit or limit in any material respect Parent's ability to vote,
receive dividends with respect to or otherwise exercise ownership rights with
respect to the stock of any of the Acquired Corporations; or (d) which would
materially and adversely affect the right of Parent or any of the Acquired
Corporations to own the assets or operate the business of the Acquired
Corporations.

     7.10  NO OTHER LITIGATION.  There shall not be pending any Legal Proceeding
in which there is a reasonable likelihood of an outcome that would have a
Material Adverse Effect on Parent: (a) challenging or seeking to restrain or
prohibit the consummation of the Merger or any of the other transactions
contemplated by this Agreement; or (b) relating to the Merger and seeking to
obtain from Parent or any of its Subsidiaries, any damages or other relief that
would be material to Parent.

     7.11  PARENT BOARD OF DIRECTORS.  Lev. J. Leytes shall have been duly
elected to Parent's Board of Directors.

SECTION 8.  TERMINATION

     8.1  TERMINATION.  This Agreement may be terminated prior to the Effective
Time (whether before or after approval of the Merger by the Required Company
Stockholder Vote):

          (a) by mutual written consent of Parent and the Company;

          (b) by either Parent or the Company if the Merger shall not have been
     consummated by December 31, 2000 (the "Termination Date") (unless the
     failure to consummate the Merger is attributable to a failure on the part
     of the party seeking to terminate this Agreement to perform any material
     obligation required to be performed by such party at or prior to the
     Effective Time); provided, however, that if at December 31, 2000 there
     shall exist a reasonable likelihood, determined in good faith by the
     Company's board of directors, that all of the conditions to the
     consummation of the Merger set forth in Sections 6 and 7 of this Agreement
     would be satisfied with the passage of additional time, then in such event
     the Company shall in its discretion have the right to extend the
     Termination Date to a date not later than February 28, 2001;

          (c) by either Parent or the Company if a court of competent
     jurisdiction or other Governmental Body shall have issued a final and
     nonappealable order, decree or ruling, or shall have taken any other
     action, having the effect of permanently restraining, enjoining or
     otherwise prohibiting the Merger;

          (d) by either Parent or the Company if (i) the Company Stockholders'
     Meeting shall have been held and (ii) this Agreement and the Merger shall
     not have been approved at such meeting by the Required Company Stockholder
     Vote; provided, however, that the Company shall not be permitted to
     terminate this Agreement pursuant to this Section 8.1(d) unless the Company
     shall have paid to Parent any fee required to be paid to Parent pursuant to
     Section 8.3(b);
                                      A-46
<PAGE>   159

          (e) by Parent (at any time prior to the adoption and approval of this
     Agreement and the Merger by the Required Company Stockholder Vote) if a
     Triggering Event shall have occurred;

          (f) by Parent if any of the Company's representations and warranties
     contained in this Agreement shall have been materially inaccurate as of the
     date of this Agreement or shall have become materially inaccurate as of any
     subsequent date (as if made on such subsequent date), or if any of the
     Company's covenants contained in this Agreement shall have been breached in
     any material respect; provided, however, that Parent may not terminate this
     Agreement under this Section 8.1(f): (i) on account of an inaccuracy in the
     Company's representations and warranties that is curable by the Company or
     on account of a breach of a covenant by the Company that is curable by the
     Company unless the Company fails to cure such inaccuracy or breach within
     30 days after receiving written notice from Parent of such inaccuracy or
     breach; or (ii) if such inaccuracy or breach (considered in the aggregate
     with all other inaccuracies or breaches) would not result in a failure of
     the conditions set forth in Section 6.1 hereof);

          (g) by the Company if any of Parent's representations and warranties
     contained in this Agreement shall have been materially inaccurate as of the
     date of this Agreement or shall have become materially inaccurate as of any
     subsequent date (as if made on such subsequent date), or if any of Parent's
     covenants contained in this Agreement shall have been breached in any
     material respect; provided, however, that the Company may not terminate
     this Agreement under this Section 8.1(g): (i) on account of an inaccuracy
     in Parent's representations and warranties that is curable by Parent or on
     account of a breach of a covenant by Parent that is curable by Parent
     unless Parent fails to cure such inaccuracy or breach within 30 days after
     receiving written notice from the Company of such inaccuracy or breach; or
     (ii) if such inaccuracy or breach (considered in the aggregate with all
     other inaccuracies or breaches) would not result in a failure of the
     conditions set forth in Section 7.1 hereof);

          (h) by either Parent or the Company if (i) the Parent Stockholders'
     Meeting shall have been held and (ii) the issuance of shares of Parent
     Common Stock contemplated by this Agreement and the Merger shall not have
     been approved at such meeting by the Required Parent Stockholder Vote;
     provided, however, that Parent shall not be permitted to terminate this
     Agreement pursuant to this Section 8.1(h) unless Parent shall have paid to
     the Company any fee required to be paid to the Company pursuant to Section
     8.3(b); or

          (i) by the Company if the board of directors of the Company shall,
     subject to complying with the terms of this Agreement, including Sections
     4.3 and 5.2(c), have approved, endorsed or recommended a Superior Offer;
     provided, however, that the Company shall not be permitted to terminate
     this Agreement pursuant to this Section 8.1(i) unless the Company shall
     have paid to Parent any fee required to be paid to Parent pursuant to
     Section 8.3(b).

     8.2  EFFECT OF TERMINATION.  In the event of the termination of this
Agreement as provided in Section 8.1, this Agreement shall be of no further
force or effect (and, except as provided in this Section 8.2, there shall be no
liability or obligation hereunder on the part of any of the parties hereto or
their respective officers, directors, stockholders or Affiliates); provided,
however, that (i) this Section 8.2, Section 8.3 and Section 9 shall survive the
termination of this Agreement and shall remain in full force and effect, and
(ii) the termination of this Agreement shall not relieve any party from any
liability for any willful breach of any representation, warranty or covenant
contained in this Agreement.

     8.3  EXPENSES; TERMINATION FEES.

     (a) Except as set forth in this Section 8.3, all fees and expenses incurred
in connection with this Agreement and the transactions contemplated by this
Agreement shall be paid by the party incurring such expenses, whether or not the
Merger is consummated; provided, however, that Parent and the Company shall
share equally all fees and expenses, other than attorneys' and accounting fees
and expenses, incurred in connection with (i) the filing, printing and mailing
of the Form S-4 Registration Statement and the

                                      A-47
<PAGE>   160

Joint Prospectus/Proxy Statement and any amendments or supplements thereto and
(ii) the filing of the premerger notification and report forms relating to the
Merger under the HSR Act, if any be required.

     (b) (i) If (x) this Agreement is terminated by Parent or the Company
pursuant to Section 8.1(d) and at or prior to the time of such termination an
Acquisition Proposal shall have been disclosed, announced, commenced, submitted
or made (and shall not have been publicly, absolutely and unconditionally
withdrawn and abandoned), (y) this Agreement is terminated by Parent pursuant to
Section 8.1(e) or (z) this Agreement is terminated by the Company pursuant to
Section 8.1(i), then, in any such case, the Company shall pay to Parent, in cash
at the time specified in the next sentence, a nonrefundable fee in the amount of
$9,000,000. In the case of termination of this Agreement by the Company pursuant
to Section 8.1(d) in the circumstances contemplated by clause (x) above or
Section 8.1(i), the fee referred to in the preceding sentence shall be paid by
the Company prior to such termination; and in the case of termination of this
Agreement by Parent pursuant to Section 8.1(d) in the circumstances contemplated
by clause (x) above or Section 8.1(e), the fee referred to in the preceding
sentence shall be paid by the Company within two business days after such
termination.

     (ii) If (x) this Agreement is terminated by Parent or the Company pursuant
to Section 8.1(d) in circumstances in which no fee is due under clause (x) of
Section 8.3(b)(i) and no event has occurred since March 31, 2000 that has had,
or would reasonably be expected to have, a Material Adverse Effect on Parent,
then, in any such case, the Company shall pay to Parent, in cash at the time
specified in the next sentence, a nonrefundable fee in the amount of $5,000,000.
In the case of termination of this Agreement by the Company pursuant to Section
8.1(d) in the circumstances contemplated by this clause (ii), the fee referred
to in the preceding sentence shall be paid by the Company prior to such
termination; and in the case of termination of this Agreement by Parent pursuant
to Section 8.1(d) in the circumstances contemplated by this clause (ii), the fee
referred to in the preceding sentence shall be paid by the Company within two
business days after such termination.

     (iii) If (x) this Agreement is terminated by Parent or the Company pursuant
to Section 8.1(h) and no event has occurred since March 31, 2000 that has had,
or would reasonably be expected to have, a Material Adverse Effect on the
Acquired Corporations, then, in any such case, Parent shall pay to the Company,
in cash at the time specified in the next sentence, a nonrefundable fee in the
amount of $5,000,000. In the case of termination of this Agreement by Parent
pursuant to Section 8.1(h), the fee referred to in the preceding sentence shall
be paid by Parent prior to such termination; and in the case of termination of
this Agreement by the Company pursuant to Section 8.1(h), the fee referred to in
the preceding sentence shall be paid by Parent within two business days after
such termination.

     (iv) If (x) this Agreement is terminated by Parent or the Company pursuant
to Section 8.1(b) and at the time of such termination the condition set forth in
Section 6.6(g) shall not have been satisfied and Parent shall not have
irrevocably waived compliance with such condition, (y) all other conditions to
the consummation of the Merger set forth in Section 6 shall have been satisfied
other than those conditions set forth in Sections 6.3, 6.4, 6.6(e), 6.6(f),
6.6(g), 6.6(h), 6.6(i) and 6.6(j) (it being the understanding of the parties
that in determining whether the conditions set forth in Section 6.1 and 6.2
shall have been satisfied for this purpose, the term "Termination Date" shall be
substituted for the terms "Closing Date" and "Closing") and (z) the failure for
the condition set forth in Section 6.6(g) to be satisfied is not directly or
indirectly related to any action taken, or failed to be taken, by the Company or
any of its affiliates (except for actions taken prior to the execution of this
Agreement or any fact related to the Company prior to the execution of this
Agreement, in each case the existence of which was disclosed to Parent and its
independent accountants prior to the execution of this Agreement), then, in any
such case, Parent shall pay to the Company, in cash at the time specified in the
last sentence of this clause (iv), a nonrefundable fee in the amount of
$5,000,000. In the case of termination of this Agreement by Parent pursuant to
Section 8.1(b) in the circumstances contemplated by this clause (iv), the fee
referred to in this clause (iv) shall be paid by Parent prior to such
termination; and in the case of termination of this Agreement by the Company
pursuant to Section 8.1(b) in the circumstances contemplated by this clause
(iv), the fee referred to in this clause (iv) shall be paid by Parent within two
business days after such termination.
                                      A-48
<PAGE>   161

     (c) All payments required to be made pursuant to Section 8.3(b) above shall
be made in immediately available funds to an account designated by the recipient
thereof. Any payment that is not made when due pursuant to the foregoing shall
bear interest, commencing on the date that the payment became due, at a rate
equal to the rate of interest publicly announced by Citibank, N.A., from time to
time, in the City of New York, as such bank's Base Rate plus 3%.

SECTION 9.  MISCELLANEOUS PROVISIONS

     9.1  AMENDMENT.  This Agreement may be amended with the approval of the
respective boards of directors of the Company and Parent at any time (whether
before or after the adoption and approval of this Agreement and the approval of
the Merger by the stockholders of the Company); provided, however, that after
any such adoption and approval of this Agreement and approval of the Merger by
the Company's stockholders, no amendment shall be made which by law requires
further approval of the stockholders of the Company without the further approval
of such stockholders. This Agreement may not be amended except by an instrument
in writing signed on behalf of each of the parties hereto.

     9.2  WAIVER.

     (a) No failure on the part of either party to exercise any power, right,
privilege or remedy under this Agreement, and no delay on the part of either
party in exercising any power, right, privilege or remedy under this Agreement,
shall operate as a waiver of such power, right, privilege or remedy; and no
single or partial exercise of any such power, right, privilege or remedy shall
preclude any other or further exercise thereof or of any other power, right,
privilege or remedy.

     (b) Neither party shall be deemed to have waived any claim arising out of
this Agreement, or any power, right, privilege or remedy under this Agreement,
unless the waiver of such claim, power, right, privilege or remedy is expressly
set forth in a written instrument duly executed and delivered on behalf of such
party; and any such waiver shall not be applicable or have any effect except in
the specific instance in which it is given.

     9.3  NO SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  None of the
representations and warranties contained in this Agreement or in any certificate
delivered pursuant to this Agreement shall survive the Merger.

     9.4  ENTIRE AGREEMENT; COUNTERPARTS.  This Agreement and the other
agreements referred to herein (including in Section 4.1(c)) constitute the
entire agreement and supersede all prior agreements and understandings, both
written and oral, among the parties with respect to the subject matter hereof
and thereof. This Agreement may be executed in several counterparts, each of
which shall be deemed an original and all of which shall constitute one and the
same instrument

     9.5  APPLICABLE LAW; JURISDICTION.  This Agreement shall be governed by,
and construed in accordance with, the laws of the State of Delaware, regardless
of the laws that might otherwise govern under applicable principles of conflicts
of laws thereof. In any action between the parties arising out of or relating to
this Agreement or any of the transactions contemplated by this Agreement: (a)
each of the parties irrevocably and unconditionally consents and submits to the
exclusive jurisdiction and venue of the state and federal courts located in the
State of California; (b) if any such action is commenced in a state court, then,
subject to applicable law, no party shall object to the removal of such action
to any federal court located in the Northern District of California; (c) each of
the parties irrevocably waives the right to trial by jury; and (d) each of the
parties irrevocably consents to service of process by first class certified
mail, return receipt requested, postage prepaid, to the address at which such
party is to receive notice in accordance with Section 9.9.

     9.6  DISCLOSURE SCHEDULE.  The Company Disclosure Schedule shall be
arranged in separate parts corresponding to the numbered and lettered Sections
contained in Section 2, and the information disclosed in any numbered or
lettered part shall be deemed to relate to and to qualify any other
representation or warranty to which the relevance of any representation or
warranty is reasonably apparent.

                                      A-49
<PAGE>   162

     9.7  ATTORNEYS' FEES.  In any action at law or suit in equity to enforce
this Agreement or the rights of any of the parties hereunder, the prevailing
party in such action or suit shall be entitled to receive a sum for its
reasonable attorneys' fees and all other reasonable costs and expenses incurred
in such action or suit.

     9.8  ASSIGNABILITY.  This Agreement shall be binding upon, and shall be
enforceable by and inure solely to the benefit of, the parties hereto and their
respective successors and assigns; provided, however, that neither this
Agreement nor any of the Company's rights hereunder may be assigned by the
Company without the prior written consent of Parent, and any attempted
assignment of this Agreement or any of such rights by the Company without such
consent shall be void and of no effect. Except as otherwise contemplated in
Section 5.7(d), nothing in this Agreement, express or implied, is intended to or
shall confer upon any Person any right, benefit or remedy of any nature
whatsoever under or by reason of this Agreement.

     9.9  NOTICES.  Any notice or other communication required or permitted to
be delivered to any party under this Agreement shall be in writing and shall be
deemed properly delivered, given and received (a) upon receipt when delivered by
hand, or (b) two business days after sent by registered mail or by courier or
express delivery service, or by facsimile, provided that in each case the notice
or other communication is sent to the address or facsimile telephone number set
forth beneath the name of such party below (or to such other address or
facsimile telephone number as such party shall have specified in a written
notice given to the other parties hereto):

        If to Parent or Merger Sub:  Molecular Devices Corporation
                                     1311 Orleans Drive
                                     Sunnyvale, CA 94089
                                     Attn: Chief Financial Officer
                                     Facsimile: (408) 747-3699

                                     Mercury Acquisition Sub, Inc.
                                     c/o Molecular Devices Corporation
                                     1311 Orleans Drive
                                     Sunnyvale, CA 94089
                                     Attn: Chief Financial Officer
                                     Facsimile: (408) 747-3699

                                     In each case with a copy to:

                                     Cooley Godward LLP
                                     Five Palo Alto Square
                                     3000 El Camino Real
                                     Palo Alto, CA 94306
                                     Attn: James C. Kitch and Suzanne
                                     Sawochka Hooper
                                     Facsimile: (650) 849-7400

        If to the Company:           LJL BioSystems, Inc.
                                     404 Tasman Drive
                                     Sunnyvale, CA 94089
                                     Attn: Chief Financial Officer
                                     Facsimile: (408) 541-8786

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<PAGE>   163

                                     With a copy to:

                                     Venture Law Group
                                     2800 Sand Hill Road
                                     Menlo Park, CA 94025
                                     Attn: Mark B. Weeks and Steve Tonsfeldt
                                     Facsimile: (650) 233-8386

     9.10  COOPERATION.  The Company and Parent agree to cooperate fully with
each other and to execute and deliver such further documents, certificates,
agreements and instruments and to take such other actions as may be reasonably
requested by the other to evidence or reflect the transactions contemplated by
this Agreement and to carry out the intent and purposes of this Agreement.

     9.11  CONSTRUCTION.

     (a) For purposes of this Agreement, whenever the context requires: the
singular number shall include the plural, and vice versa; the masculine gender
shall include the feminine and neuter genders; the feminine gender shall include
the masculine and neuter genders; and the neuter gender shall include masculine
and feminine genders.

     (b) The parties hereto agree that any rule of construction to the effect
that ambiguities are to be resolved against the drafting party shall not be
applied in the construction or interpretation of this Agreement.

     (c) As used in this Agreement, the words "include" and "including," and
variations thereof, shall not be deemed to be terms of limitation, but rather
shall be deemed to be followed by the words "without limitation."

     (d) Except as otherwise indicated, all references in this Agreement to
"Sections," "Exhibits" and "Schedules" are intended to refer to Sections of this
Agreement and Exhibits or Schedules to this Agreement.

     (e) The bold-faced headings contained in this Agreement are for convenience
of reference only, shall not be deemed to be a part of this Agreement and shall
not be referred to in connection with the construction or interpretation of this
Agreement.

                                      A-51
<PAGE>   164

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

                                          MOLECULAR DEVICES CORPORATION

                                          By: /s/ JOSEPH D. KEEGAN, PH.D
                                            ------------------------------------
                                              Joseph D. Keegan, Ph.D
                                            President and Chief Executive
                                              Officer

                                          MERCURY ACQUISITION SUB, INC.

                                          By: /s/ JOSEPH D. KEEGAN, PH.D
                                            ------------------------------------
                                              Joseph D. Keegan, Ph.D
                                            President and Chief Executive
                                              Officer

                                          LJL BIOSYSTEMS, INC.

                                          By: /s/ LEV J. LEYTES
                                            ------------------------------------
                                              Lev J. Leytes
                                            President and Chief Executive
                                              Officer

                                      A-52
<PAGE>   165

                                   EXHIBIT A

                              CERTAIN DEFINITIONS

     For purposes of the Agreement (including this Exhibit A):

     ACQUIRED CORPORATION CONTRACT.  "Acquired Corporation Contract" shall mean
any Contract: (a) to which any of the Acquired Corporations is a party; (b) by
which any of the Acquired Corporations or any asset of any of the Acquired
Corporations is or may become bound or under which any of the Acquired
Corporations has, or may become subject to, any obligation; or (c) under which
any of the Acquired Corporations has or may acquire any right or interest.

     ACQUIRED CORPORATION PROPRIETARY ASSET.  "Acquired Corporation Proprietary
Asset" shall mean any Proprietary Asset owned by or licensed to any of the
Acquired Corporations or otherwise used by any of the Acquired Corporations.

     ACQUISITION PROPOSAL.  "Acquisition Proposal" shall mean any offer,
proposal or inquiry (other than an offer or proposal by Parent) contemplating or
otherwise relating to any Acquisition Transaction.

     ACQUISITION TRANSACTION.  "Acquisition Transaction" shall mean any
transaction or series of transactions involving:

          (A) any merger, consolidation, amalgamation, share exchange, business
     combination, issuance of securities, acquisition of securities, tender
     offer, exchange offer or other similar transaction (i) in which any of the
     Acquired Corporations is a constituent company, (ii) in which a Person or
     "group" (as defined in the Exchange Act and the rules promulgated
     thereunder) of Persons directly or indirectly acquires the Company or more
     than 40% of the Company's business or directly or indirectly acquires
     beneficial or record ownership of securities representing, or exchangeable
     for or convertible into, more than 40% of the outstanding securities of any
     class of voting securities of any of the Acquired Corporations, or (iii) in
     which any of the Acquired Corporations issues securities representing more
     than 40% of the outstanding securities of any class of voting securities of
     the Company;

          (B) any sale, lease, exchange, transfer, license, acquisition or
     disposition of more than 40% of the assets of the Company; or

          (C) any liquidation or dissolution of the Company.

     AGREEMENT.  "Agreement" shall mean the Agreement and Plan of Merger and
Reorganization to which this Exhibit A is attached, as it may be amended from
time to time.

     COMPANY COMMON STOCK.  "Company Common Stock" shall mean the Common Stock,
$0.001 par value per share, of the Company.

     COMPANY DISCLOSURE SCHEDULE.  "Company Disclosure Schedule" shall mean the
Company Disclosure Schedule that has been prepared by the Company in accordance
with the requirements of Section 9.6 of the Agreement and that has been
delivered by the Company to Parent on the date of the Agreement and signed by
the President of the Company.

     COMPANY OPTIONS.  "Company Options" shall mean the stock options granted by
the Company pursuant to the Company's stock option plans.

     COMPANY WARRANTS.  "Company Warrants" shall mean, collectively, that
certain warrant dated as of June 6, 1997 and amended as of March 17, 1998 to
purchase 50,269 shares of Company Common Stock and that certain warrant dated as
of June 17, 1998 and amended as of March 17, 1997 to purchase 15,384 shares of
Company Common Stock.

     CONSENT.  "Consent" shall mean any approval, consent, ratification,
permission, waiver or authorization (including any Governmental Authorization).

                                      A-53
<PAGE>   166

     CONTRACT.  "Contract" shall mean any written, oral or other agreement,
contract, subcontract, lease, understanding, instrument, note, option, warranty,
purchase order, license, sublicense, insurance policy, benefit plan or legally
binding commitment or undertaking of any nature.

     ENCUMBRANCE.  "Encumbrance" shall mean any lien, pledge, hypothecation,
charge, mortgage, security interest, encumbrance, claim, infringement,
interference, option, right of first refusal, preemptive right, community
property interest or restriction of any nature (including any restriction on the
voting of any security, any restriction on the transfer of any security or other
asset, any restriction on the receipt of any income derived from any asset, any
restriction on the use of any asset and any restriction on the possession,
exercise or transfer of any other attribute of ownership of any asset).

     ENTITY.  "Entity" shall mean any corporation (including any non-profit
corporation), general partnership, limited partnership, limited liability
partnership, joint venture, estate, trust, company (including any company
limited by shares, limited liability company or joint stock company), firm,
society or other enterprise, association, organization or entity.

     EXCHANGE ACT.  "Exchange Act" shall mean the Securities Exchange Act of
1934, as amended.

     FORM S-4 REGISTRATION STATEMENT.  "Form S-4 Registration Statement" shall
mean the registration statement on Form S-4 to be filed with the SEC by Parent
in connection with issuance of Parent Common Stock in the Merger, as said
registration statement may be amended prior to the time it is declared effective
by the SEC.

     GOVERNMENTAL AUTHORIZATION.  "Governmental Authorization" shall mean any:
(a) permit, license, certificate, franchise, permission, variance, clearance,
registration, qualification or authorization issued, granted, given or otherwise
made available by or under the authority of any Governmental Body or pursuant to
any Legal Requirement; or (b) right under any Contract with any Governmental
Body.

     GOVERNMENTAL BODY.  "Governmental Body" shall mean any: (a) nation, state,
commonwealth, province, territory, county, municipality, district or other
jurisdiction of any nature; (b) federal, state, local, municipal, foreign or
other government; or (c) governmental or quasi-governmental authority of any
nature (including any governmental division, department, agency, commission,
instrumentality, official, ministry, fund, foundation, center, organization,
unit, body or Entity and any court or other tribunal).

     HSR ACT.  "HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, as amended.

     JOINT PROSPECTUS/PROXY STATEMENT.  "Joint Prospectus/Proxy Statement" shall
mean the proxy statement to be sent to the Company's stockholders and the
Parent's stockholders in connection with the Company Stockholders' Meeting and
the Parent's Stockholders' Meeting.

     KNOWLEDGE of the Company shall refer to actual knowledge of any director or
executive officer of the Company.

     LEGAL PROCEEDING.  "Legal Proceeding" shall mean any action, suit,
litigation, arbitration, proceeding (including any civil, criminal,
administrative, investigative or appellate proceeding), hearing, inquiry, audit,
examination or investigation commenced, brought, conducted or heard by or
before, or otherwise involving, any court or other Governmental Body or any
arbitrator or arbitration panel.

     LEGAL REQUIREMENT.  "Legal Requirement" shall mean any federal, state,
local, municipal, foreign or other law, statute, constitution, principle of
common law, resolution, ordinance, code, edict, decree, rule, regulation, ruling
or requirement issued, enacted, adopted, promulgated, implemented or otherwise
put into effect by or under the authority of any Governmental Body (or under the
authority of the Nasdaq National Market).

     MATERIAL ADVERSE EFFECT.  An event, violation, inaccuracy, circumstance or
other matter will be deemed to have a "Material Adverse Effect" on the Acquired
Corporations if such event, violation, inaccuracy, circumstance or other matter
would have a material adverse effect on (i) the business, condition,
capitalization, assets, liabilities, operations, or financial performance of the
Acquired
                                      A-54
<PAGE>   167

Corporations taken as a whole, (ii) the ability of the Company to consummate the
Merger or any of the other transactions contemplated by the Agreement or to
perform any of its obligations under the Agreement, or (iii) Parent's ability to
vote, receive dividends with respect to or otherwise exercise ownership rights
with respect to the stock of the Surviving Corporation; provided, however, that
none of the following shall be deemed, in and of itself, to have a Material
Adverse Effect on the Acquired Corporations: (A) a change in the market price or
trading volume of the Company Common Stock, (B) an event, violation, inaccuracy,
circumstance or other matter that results from conditions affecting the U.S.
economy or the world economy, (C) an event, violation, inaccuracy, circumstance
or other matter that results from conditions affecting the biotechnology
industry so long as such conditions do not affect the Company in a
disproportionate manner as compared with companies of a similar size, (D) a
delay in customer orders arising primarily out of or resulting primarily from
the announcement of the transactions contemplated by this Agreement, (E) an
event, violation, inaccuracy, circumstance or other matter that results from the
taking of any action required by this Agreement and (F) any failure by the
Company to meet internal projections or forecasts or published revenue or
earnings predictions for any period ending (or for which revenues or earnings
are released) on or after the date of this Agreement (provided that the Company
complies with the conduct of business requirements set forth in Section 4.2 of
this Agreement). An event, violation, inaccuracy, circumstance or other matter
will be deemed to have a "Material Adverse Effect" on Parent if such event,
violation, inaccuracy, circumstance or other matter would have a material
adverse effect on (i) the business, condition, capitalization, assets,
liabilities, operations, or financial performance of Parent or (ii) the ability
of Parent to consummate the Merger or any of the other transactions contemplated
by the Agreement or to perform any of its obligations under the Agreement;
provided, however, that none of the following shall be deemed, in and of itself,
to have a Material Adverse Effect on Parent: (A) a change in the market price or
trading volume of Parent Common Stock, (B) an event, violation, inaccuracy,
circumstance or other matter that results from conditions affecting the U.S.
economy or the world economy, (C) an event, violation, inaccuracy, circumstance
or other matter that results from conditions affecting the biotechnology
industry so long as such conditions do not affect Parent in a disproportionate
manner as compared with companies of a similar size, (D) a delay in customer
orders arising primarily out of or resulting primarily from the announcement of
the transactions contemplated by this Agreement, (E) an event, violation,
inaccuracy, circumstance or other matter that results from the taking of any
action required by this Agreement; and (F) any failure by Parent to meet
internal projections or forecasts or published revenue or earnings predictions
for any period ending (or for which revenues or earnings are released) on or
after the date of this Agreement, provided, that Parent has complied with
Section 4.4 of this Agreement. The parties acknowledge that the dollar
thresholds set forth in the various representations and warranties and elsewhere
in this Agreement were established to permit a more efficient administration of
this Agreement and are not to be considered in determining whether an event,
violation, inaccuracy, circumstance or other matter will be deemed to constitute
a "Material Adverse Effect" with respect to the Acquired Corporations or Parent,
as the case may be.

     PARENT COMMON STOCK.  "Parent Common Stock" shall mean the Common Stock,
$.01 par value per share, of Parent.

     PARENT CONTRACT.  "Parent Contract" shall mean any Contract: (a) to which
Parent is a party; (b) by which Parent or any asset of Parent is or may become
bound or under which Parent has, or may become subject to, any obligation; or
(c) under which Parent has or may acquire any right or interest.

     PARENT PROPRIETARY ASSET.  "Parent Proprietary Asset" shall mean any
Proprietary Asset owned by or licensed to Parent or otherwise used by Parent.

     PARENT OPTIONS.  "Parent Options" shall mean the stock options granted by
Parent pursuant to Parent's stock option plans.

     PERSON.  "Person" shall mean any individual, Entity or Governmental Body.

     PROPRIETARY ASSET.  "Proprietary Asset" shall mean any: (a) patent, patent
application, trademark (whether registered or unregistered), trademark
application, trade name, fictitious business name, service mark (whether
registered or unregistered), service mark application, copyright (whether
registered or
                                      A-55
<PAGE>   168

unregistered), copyright application, maskwork, maskwork application, trade
secret, know-how, customer list, franchise, system, computer software, computer
program, source code, algorithm, invention, design, blueprint, engineering
drawing, proprietary product, technology, proprietary right or other
intellectual property right or intangible asset; or (b) right to use or exploit
any of the foregoing.

     REPRESENTATIVES.  "Representatives" shall mean officers, directors,
employees, agents, attorneys, accountants, advisors and representatives.

     REQUIRED COMPANY STOCKHOLDER VOTE.  "Required Company Stockholder Vote"
shall have the meaning set forth in Section 2.27.

     REQUIRED PARENT STOCKHOLDER VOTE.  "Required Parent Stockholder Vote" shall
have the meaning set forth in Section 6.4.

     SEC.  "SEC" shall mean the United States Securities and Exchange
Commission.

     SECURITIES ACT.  "Securities Act" shall mean the Securities Act of 1933, as
amended.

     SUBSIDIARY.  An entity shall be deemed to be a "Subsidiary" of another
Person if such Person directly or indirectly owns, beneficially or of record,
(a) an amount of voting securities of other interests in such Entity that is
sufficient to enable such Person to elect at leased a majority of the members of
such Entity's board of directors or other governing body, or (b) at least 50% of
the outstanding equity or financial interests or such Entity.

     SUPERIOR OFFER.  "Superior Offer" shall mean an unsolicited, bona fide
written offer made by a third party to purchase (by means of a merger,
consolidation, amalgamation, share exchange, business combination, issuance of
securities, acquisition of securities, tender offer, exchange offer or other
similar transaction) more than 50% of the outstanding shares of Company Common
Stock, which the board of directors of the Company determines, in good faith,
after consultation with its financial advisor, has terms more favorable to the
Company's stockholders than the terms of the Merger after taking into account
all pertinent factors deemed relevant by the board of directors of the Company
under the laws of the State of Delaware; provided, however, that any such offer
shall not be deemed to be a "Superior Offer" unless any financing required to
consummate the transaction contemplated by such offer is either (i) in the
possession of such third party at the time such offer is made, or (ii) committed
and likely, based upon a reasonable determination of the board of directors of
the Company, to be obtained by such third party on a timely basis.

     TAX.  "Tax" shall mean any tax (including any income tax, franchise tax,
capital gains tax, gross receipts tax, value-added tax, surtax, estimated tax,
unemployment tax, national health insurance tax, excise tax, ad valorem tax,
transfer tax, stamp tax, sales tax, use tax, property tax, business tax,
withholding tax or payroll tax), levy, assessment, tariff, duty (including any
customs duty), deficiency or fee, and any related charge or amount (including
any fine, penalty or interest), imposed, assessed or collected by or under the
authority of any Governmental Body.

     TAX RETURN.  "Tax Return" shall mean any return (including any information
return), report, statement, declaration, estimate, schedule, notice,
notification, form, election, certificate or other document or information filed
with or submitted to, or required to be filed with or submitted to, any
Governmental Body in connection with the determination, assessment, collection
or payment of any Tax or in connection with the administration, implementation
or enforcement of or compliance with any Legal Requirement relating to any Tax.

     TRIGGERING EVENT.  A "Triggering Event" shall be deemed to have occurred
if: (i) the board of directors of the Company shall have failed to recommend, or
shall for any reason have withdrawn or shall have amended or modified in a
manner adverse to Parent its unanimous recommendation in favor of, the adoption
and approval of the Agreement or the approval of the Merger; (ii) the Company
shall have failed to include in the Joint Prospectus/Proxy Statement the
recommendation of the board of directors of the Company in favor of the adoption
and approval of the Agreement and the approval of the Merger; (iii) the board of
directors of the Company fails to reaffirm its recommendation in favor of the
adoption
                                      A-56
<PAGE>   169

and approval of the Agreement and the approval of the Merger within ten business
days after an Acquisition Proposal shall have been publicly announced and Parent
requests in writing that such recommendation be reaffirmed; (iv) the board of
directors of the Company shall have approved, endorsed or recommended any
Acquisition Proposal; (v) the Company shall have entered into any letter of
intent or similar document or any Contract relating to any Acquisition Proposal;
(vi) a tender or exchange offer relating to securities of the Company shall have
been commenced and the Company shall not have sent to its securityholders,
within ten business days after the commencement of such tender or exchange
offer, a statement disclosing that the Company recommends rejection of such
tender or exchange offer; (vii) an Acquisition Proposal is publicly announced,
and the Company (A) fails to issue a press release announcing its opposition to
such Acquisition Proposal within ten business days after such Acquisition
Proposal is announced or (B) otherwise fails to oppose such Acquisition Proposal
within ten business days after such Acquisition Proposal is announced; or (ix)
the Company intentionally breaches any of its obligations under Section 4.3 of
the Agreement.

                                      A-57
<PAGE>   170

                                                                         ANNEX B

                            PARENT VOTING AGREEMENT

     THIS PARENT VOTING AGREEMENT is entered into as of June   , 2000, by and
between LJL BIOSYSTEMS, INC., a Delaware corporation (the "COMPANY"), and
               ("STOCKHOLDER").

                                    RECITALS

     A.  Molecular Devices Corporation, a Delaware corporation ("PARENT"),
Mercury Acquisition Sub, Inc., a Delaware corporation and a wholly owned
subsidiary of Parent ("MERGER SUB"), and the Company, are entering into an
Agreement and Plan of Merger and Reorganization of even date herewith (the
"REORGANIZATION AGREEMENT") which provides (subject to the conditions set forth
therein) for the merger of Merger Sub into the Company (the "MERGER").

     B.  In order to induce the Company to enter into the Reorganization
Agreement, Stockholder is entering into this Parent Voting Agreement.

                                   AGREEMENT

     The parties to this Parent Voting Agreement, intending to be legally bound,
agree as follows:

SECTION 1.  CERTAIN DEFINITIONS

     For purposes of this Parent Voting Agreement:

     (a) "PARENT COMMON STOCK" shall mean the common stock, par value $0.001 per
share, of Parent.

     (b) "EXPIRATION DATE" shall mean the earlier of (i) the date upon which the
Reorganization Agreement is validly terminated, or (ii) the date upon which the
Merger becomes effective.

     (c) Stockholder shall be deemed to "OWN" or to have acquired "Ownership" of
a security if Stockholder: (i) is the record owner of such security; or (ii) is
the "beneficial owner" (within the meaning of Rule 13d-3 under the Securities
Exchange Act of 1934) of such security.

     (d) "PERSON" shall mean any (i) individual, (ii) corporation, limited
liability company, partnership or other entity, or (iii) governmental authority.

     (e) "SUBJECT SECURITIES" shall mean: (i) all securities of Parent
(including all shares of Parent Common Stock and all options, warrants and other
rights to acquire shares of Parent Common Stock) Owned by Stockholder as of the
date of this Agreement; and (ii) all additional securities of Parent (including
all additional shares of Parent Common Stock and all additional options,
warrants and other rights to acquire shares of Parent Common Stock) of which
Stockholder acquires Ownership during the period from the date of this Agreement
through the Expiration Date.

     (f) A Person shall be deemed to have effected a "TRANSFER" of a security if
such Person directly or indirectly: (i) sells, pledges, encumbers, grants an
option with respect to, transfers or disposes of such security or any interest
in such security; or (ii) enters into an agreement or commitment contemplating
the possible sale of, pledge of, encumbrance of, grant of an option with respect
to, transfer of or disposition of such security or any interest therein.

SECTION 2.  TRANSFER OF SUBJECT SECURITIES

     2.1  TRANSFEREE OF SUBJECT SECURITIES TO BE BOUND BY THIS
AGREEMENT.  Stockholder agrees that, during the period from the date of this
Parent Voting Agreement through the Expiration Date, Stockholder shall not cause
or permit any Transfer of any of the Subject Securities to be effected unless
each Person to which any of such Subject Securities, or any interest in any of
such Subject Securities, is

                                       B-1
<PAGE>   171

or may be transferred shall have: (a) executed a counterpart of this Parent
Voting Agreement and a proxy in the form attached hereto as Exhibit A (with such
modifications as the Company may reasonably request); and (b) agreed to hold
such Subject Securities (or interest in such Subject Securities) subject to all
of the terms and provisions of this Parent Voting Agreement; provided, however,
that nothing contained herein will be deemed to restrict the exercise by
Stockholder of options to acquire Parent Common Stock.

     2.2  TRANSFER OF VOTING RIGHTS.  Stockholder agrees that, during the period
from the date of this Parent Voting Agreement through the Expiration Date, so
long as such shares are Owned by Stockholder, Stockholder shall ensure that: (a)
none of the Subject Securities is deposited into a voting trust; and (b) except
pursuant to this Parent Voting Agreement, no proxy is granted, and no voting
agreement or similar agreement is entered into, with respect to any of the
Subject Securities.

SECTION 3.  VOTING OF SHARES

     3.1  VOTING AGREEMENT.  Stockholder agrees that, during the period from the
date of this Parent Voting Agreement through the Expiration Date:

          (a) at any meeting of stockholders of Parent at which matters relating
     to the Merger, the Reorganization Agreement or any actions contemplated
     thereby, however called, Stockholder shall (unless otherwise directed in
     writing by the Company) cause all outstanding shares of Parent Common Stock
     that are Owned by Stockholder as of the record date fixed for such meeting
     to be voted in favor of the issuance of Parent Common Stock in the Merger,
     in favor of the election of Lev J. Leytes to the Board of Directors of
     Parent, and in favor of each of the other actions contemplated by the
     Reorganization Agreement; and

          (b) in the event written consents are solicited or otherwise sought
     from stockholders of Parent with respect to the approval of the issuance of
     Parent Common Stock in the Merger, with respect to the approval of the
     election of Lev J. Leytes to the Board of Directors of Parent, or with
     respect to any of the other actions contemplated by the Reorganization
     Agreement, Stockholder shall (unless otherwise directed in writing by the
     Company) cause to be executed, with respect to all shares of Parent Common
     Stock that are Owned by Stockholder as of the record date fixed for the
     consent to the proposed action, a written consent or written consents to
     such proposed action.

     3.2  This Parent Voting Agreement is intended to bind Stockholder only with
respect to the specific matters set forth herein, and shall not prohibit
Stockholder from acting in accordance with his fiduciary duties as an officer or
director of Parent. Stockholder will retain at all times the right to vote the
Stockholder's Subject Securities, in Stockholder's sole discretion, on all
matters other than those set forth in this Section 3.1 which are at any time or
from time to time presented to Parent's stockholders generally.

     3.3  PROXY.  Contemporaneously with the execution of this Parent Voting
Agreement: (i) Stockholder shall deliver to the Company a proxy in the form
attached to this Parent Voting Agreement as Exhibit A, which shall be
irrevocable to the fullest extent permitted by law, with respect to the shares
referred to therein (the "PROXY"); and (ii) Stockholder shall use his, her or
its reasonable best efforts to cause to be delivered to the Company an
additional proxy (in the form attached hereto as Exhibit A) executed on behalf
of the record owner of any outstanding shares of Parent Common Stock that are
owned beneficially (within the meaning of Rule 13d-3 under the Securities
Exchange Act of 1934), but not of record, by Stockholder.

SECTION 4.  RESERVED.

SECTION 5.  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

     Stockholder hereby represents and warrants to the Company as follows:

     5.1  AUTHORIZATION, ETC.  Stockholder has the right, power, authority and
capacity to execute and deliver this Parent Voting Agreement and the Proxy and
to perform his obligations hereunder and

                                       B-2
<PAGE>   172

thereunder. This Parent Voting Agreement and the Proxy have been duly executed
and delivered by Stockholder and, assuming the due authorization, execution, and
delivery by the Company, constitute legal, valid and binding obligations of
Stockholder, enforceable against Stockholder in accordance with their terms,
subject to (i) laws of general application relating to bankruptcy, insolvency
and the relief of debtors, and (ii) rules of law governing specific performance,
injunctive relief and other equitable remedies.

     5.2  NO CONFLICTS OR CONSENTS

     (a) The execution and delivery of this Parent Voting Agreement and the
Proxy by Stockholder do not, and the performance of this Parent Voting Agreement
and the Proxy by Stockholder will not: (i) conflict with or violate any law,
rule, regulation, order, decree or judgment applicable to Stockholder or by
which he or any of his properties is or may be bound or affected; or (ii) result
in or constitute (with or without notice or lapse of time) any breach of or
default under, or give to any other Person (with or without notice or lapse of
time) any right of termination, amendment, acceleration or cancellation of, or
result (with or without notice or lapse of time) in the creation of any
encumbrance or restriction on any of the Subject Securities pursuant to, any
contract to which Stockholder is a party or by which Stockholder or any of his
affiliates or properties is or may be bound or affected.

     (b) The execution and delivery of this Parent Voting Agreement and the
Proxy by Stockholder do not, and the performance of this Parent Voting Agreement
and the Proxy by Stockholder will not, require any consent or approval of any
Person.

     5.3  TITLE TO SECURITIES.  As of the date of this Parent Voting Agreement:
(a) Stockholder holds of record (free and clear of any encumbrances or
restrictions) the number of outstanding shares of Parent Common Stock set forth
under the heading "Shares Held of Record" on the signature page hereof; (b)
Stockholder holds (free and clear of any encumbrances or restrictions) the
options, warrants and other rights to acquire shares of Parent Common Stock set
forth under the heading "Options and Other Rights" on the signature page hereof;
(c) Stockholder Owns the additional securities of Parent set forth under the
heading "Additional Securities Beneficially Owned" on the signature page hereof;
and (d) Stockholder does not directly or indirectly Own any shares of capital
stock or other securities of Parent, or any option, warrant or other right to
acquire (by purchase, conversion or otherwise) any shares of capital stock or
other securities of Parent, other than the shares and options, warrants and
other rights set forth on the signature page hereof.

     5.4  ACCURACY OF REPRESENTATIONS.  The representations and warranties
contained in this Parent Voting Agreement are accurate in all respects as of the
date of this Parent Voting Agreement, will be accurate in all respects at all
times through the Expiration Date and will be accurate in all respects as of the
date of the consummation of the Merger as if made on that date (except with
respect to the representations set forth in Section 5.3 in cases where
Stockholder has Transferred shares of Parent Common Stock in accordance with the
terms and provisions of Section 2 of this Parent Voting Agreement).

SECTION 6.  ADDITIONAL COVENANTS OF STOCKHOLDER

     6.1  FURTHER ASSURANCES.  From time to time and without additional
consideration, Stockholder shall (at the Company's expense) execute and deliver,
or cause to be executed and delivered, such additional transfers, assignments,
endorsements, proxies, consents and other instruments, and shall (at the
Company's expense) take such further actions, as the Company may reasonably
request for the purpose of carrying out and furthering the intent of this Parent
Voting Agreement.

     6.2  RESERVED.

                                       B-3
<PAGE>   173

SECTION 7.  MISCELLANEOUS

     7.1  EXPENSES.  Except as contemplated by Section 6.1, all costs and
expenses incurred in connection with the transactions contemplated by this
Parent Voting Agreement shall be paid by the party incurring such costs and
expenses.

     7.2  NOTICES.  Any notice or other communication required or permitted to
be delivered to either party under this Parent Voting Agreement shall be in
writing and shall be deemed properly delivered, given and received (a) upon
receipt when delivered by hand, or (b) two business days after sent by courier
or express delivery service or by facsimile, provided that in each case the
notice or other communication is sent to the address or facsimile telephone
number set forth beneath the name of such party below (or to such other address
or facsimile telephone number as such party shall have specified in a written
notice given to the other party):

        IF TO STOCKHOLDER:

           at the address set forth below Stockholder's signature on the
           signature page hereof

        WITH A COPY TO:

           Cooley Godward LLP
           Five Palo Alto Square
           3000 El Camino Real
           Palo Alto, CA 94306
           Attn: James C. Kitch and
           Suzanne Sawochka Hooper
           Facsimile: (650) 849-7400

        IF TO THE COMPANY:

           LJL BioSystems, Inc.
           404 Tasman Drive
           Sunnyvale, CA 94089
           Attn: Lev J. Leytes
           Tel: (408) 541-8787
           Fax: (408) 541-8786

     7.3  SEVERABILITY.  If any provision of this Parent Voting Agreement or any
part of any such provision is held under any circumstances to be invalid or
unenforceable in any jurisdiction, then (a) such provision or part thereof
shall, with respect to such circumstances and in such jurisdiction, be deemed
amended to conform to applicable laws so as to be valid and enforceable to the
fullest possible extent, (b) the invalidity or unenforceability of such
provision or part thereof under such circumstances and in such jurisdiction
shall not affect the validity or enforceability of such provision or part
thereof under any other circumstances or in any other jurisdiction, and (c) the
invalidity or unenforceability of such provision or part thereof shall not
affect the validity or enforceability of the remainder of such provision or the
validity or enforceability of any other provision of this Parent Voting
Agreement. Each provision of this Parent Voting Agreement is separable from
every other provision of this Parent Voting Agreement, and each part of each
provision of this Parent Voting Agreement is separable from every other part of
such provision.

     7.4  ENTIRE AGREEMENT.  This Parent Voting Agreement, the Proxy and any
other documents delivered by the parties in connection herewith constitute the
entire agreement between the parties with respect to the subject matter hereof
and thereof and supersede all prior agreements and understandings between the
parties with respect thereto. No addition to or modification of any provision of
this Parent Voting Agreement or the Proxy shall be binding upon either party
unless made in writing and signed by both parties.

                                       B-4
<PAGE>   174

     7.5  ASSIGNMENT; BINDING EFFECT.  Except as provided herein, neither this
Parent Voting Agreement nor any of the interests or obligations hereunder may be
assigned or delegated by Stockholder and any attempted or purported assignment
or delegation of any of such interests or obligations shall be void. Subject to
the preceding sentence, this Parent Voting Agreement shall be binding upon
Stockholder and his heirs, estate, executors, personal representatives,
successors and assigns, and shall inure to the benefit of the Company and its
successors and assigns. Without limiting any of the restrictions set forth in
Section 2 or elsewhere in this Parent Voting Agreement, this Parent Voting
Agreement shall be binding upon any Person to whom any Subject Securities are
transferred. Nothing in this Parent Voting Agreement is intended to confer on
any Person (other than the Company and its successors and assigns) any rights or
remedies of any nature.

     7.6  SPECIFIC PERFORMANCE.  The parties agree that irreparable damage would
occur in the event that any of the provisions of this Parent Voting Agreement or
the Proxy was not performed in accordance with its specific terms or was
otherwise breached. Stockholder agrees that, in the event of any breach or
threatened breach by Stockholder of any covenant or obligation contained in this
Parent Voting Agreement or in the Proxy, the Company shall be entitled (in
addition to any other remedy that may be available to it, including monetary
damages) to seek and obtain (a) a decree or order of specific performance to
enforce the observance and performance of such covenant or obligation, and (b)
an injunction restraining such breach or threatened breach. Stockholder further
agrees that neither the Company nor any other Person shall be required to
obtain, furnish or post any bond or similar instrument in connection with or as
a condition to obtaining any remedy referred to in this Section 7.6, and
Stockholder irrevocably waives any right he may have to require the obtaining,
furnishing or posting of any such bond or similar instrument.

     7.7  NON-EXCLUSIVITY.  The rights and remedies of the Company under this
Parent Voting Agreement are not exclusive of or limited by any other rights or
remedies which it may have, whether at law, in equity, by contract or otherwise,
all of which shall be cumulative (and not alternative). Without limiting the
generality of the foregoing, the rights and remedies of the Company under this
Parent Voting Agreement, and the obligations and liabilities of Stockholder
under this Parent Voting Agreement, are in addition to their respective rights,
remedies, obligations and liabilities under common law requirements and under
all applicable statutes, rules and regulations. Nothing in this Parent Voting
Agreement shall limit any of Stockholder's obligations, or the rights or
remedies of the Company, under any Affiliate Agreement between the Company and
Stockholder; and nothing in any such Affiliate Agreement shall limit any of
Stockholder's obligations, or any of the rights or remedies of the Company,
under this Parent Voting Agreement.

     7.8  GOVERNING LAW; VENUE.

     (a) This Parent Voting Agreement and the Proxy shall be construed in
accordance with, and governed in all respects by, the laws of the State of
Delaware (without giving effect to principles of conflicts of laws).

     (b) Any legal action or other legal proceeding relating to this Parent
Voting Agreement or the Proxy or the enforcement of any provision of this Parent
Voting Agreement or the Proxy may be brought or otherwise commenced in any state
or federal court located in the County of Santa Clara, California. Stockholder:
(i) expressly and irrevocably consents and submits to the jurisdiction of each
state and federal court located in the County of Santa Clara, California (and
each appellate court located in the State of California), in connection with any
such legal proceeding; (ii) agrees that service of any process, summons, notice
or document by U.S. mail addressed to him at the address set forth in Section
7.2 shall constitute effective service of such process, summons, notice or
document for purposes of any such legal proceeding; (iii) agrees that each state
and federal court located in the County of Santa Clara, California, shall be
deemed to be a convenient forum; and (iv) agrees not to assert (by way of
motion, as a defense or otherwise), in any such legal proceeding commenced in
any state or federal court located in the County of Santa Clara, California, any
claim that Stockholder is not subject personally to the jurisdiction of such
court, that such legal proceeding has been brought in an inconvenient forum,
that the venue of such proceeding is improper or that this Parent Voting
Agreement or the subject matter of this Parent Voting

                                       B-5
<PAGE>   175

Agreement may not be enforced in or by such court. Nothing contained in this
Section 7.8(b) shall be deemed to limit or otherwise affect the right of the
Company to commence any legal proceeding or otherwise proceed against
Stockholder in any other forum or jurisdiction.

     (c) STOCKHOLDER IRREVOCABLY WAIVES THE RIGHT TO A JURY TRIAL IN CONNECTION
WITH ANY LEGAL PROCEEDING RELATING TO THIS PARENT VOTING AGREEMENT OR THE PROXY
OR THE ENFORCEMENT OF ANY PROVISION OF THIS PARENT VOTING AGREEMENT OR THE
PROXY.

     7.9  COUNTERPARTS.  This Parent Voting Agreement may be executed by the
parties in separate counterparts, each of which when so executed and delivered
shall be an original, but all such counterparts shall together constitute one
and the same instrument.

     7.10  CAPTIONS.  The captions contained in this Parent Voting Agreement are
for convenience of reference only, shall not be deemed to be a part of this
Parent Voting Agreement and shall not be referred to in connection with the
construction or interpretation of this Parent Voting Agreement.

     7.11  ATTORNEYS' FEES.  If any legal action or other legal proceeding
relating to this Parent Voting Agreement or the enforcement of any provision of
this Parent Voting Agreement is brought by one party against the other party,
the prevailing party shall be entitled to recover reasonable attorneys' fees,
costs and disbursements (in addition to any other relief to which the prevailing
party may be entitled).

     7.12  WAIVER.  No failure on the part of the Company to exercise any power,
right, privilege or remedy under this Parent Voting Agreement, and no delay on
the part of the Company in exercising any power, right, privilege or remedy
under this Parent Voting Agreement, shall operate as a waiver of such power,
right, privilege or remedy; and no single or partial exercise of any such power,
right, privilege or remedy shall preclude any other or further exercise thereof
or of any other power, right, privilege or remedy. The Company shall not be
deemed to have waived any claim available to the Company arising out of this
Parent Voting Agreement, or any power, right, privilege or remedy of the Company
under this Parent Voting Agreement, unless the waiver of such claim, power,
right, privilege or remedy is expressly set forth in a written instrument duly
executed and delivered on behalf of the Company; and any such waiver shall not
be applicable or have any effect except in the specific instance in which it is
given.

     7.13  CONSTRUCTION.

     (a) For purposes of this Parent Voting Agreement, whenever the context
requires: the singular number shall include the plural, and vice versa; the
masculine gender shall include the feminine and neuter genders; the feminine
gender shall include the masculine and neuter genders; and the neuter gender
shall include masculine and feminine genders.

     (b) The parties agree that any rule of construction to the effect that
ambiguities are to be resolved against the drafting party shall not be applied
in the construction or interpretation of this Parent Voting Agreement.

     (c) As used in this Parent Voting Agreement, the words "include" and
"including," and variations thereof, shall not be deemed to be terms of
limitation, but rather shall be deemed to be followed by the words "without
limitation."

     (d) Except as otherwise indicated, all references in this Parent Voting
Agreement to "Sections" and "Exhibits" are intended to refer to Sections of this
Parent Voting Agreement and Exhibits to this Parent Voting Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       B-6
<PAGE>   176

     IN WITNESS WHEREOF, the Company and Stockholder have caused this Parent
Voting Agreement to be executed as of the date first written above.

                                          LJL BIOSYSTEMS, INC.

                                          By:
                                          --------------------------------------
                                                        (Signature)

                                            ------------------------------------
                                                        (Print Name)

                                          STOCKHOLDER

                                          --------------------------------------
                                                       (Signature)

                                          --------------------------------------
                                                       (Print Name)

                                          Address:
                                          --------------------------------------

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

                                          Facsimile:
                                          --------------------------------------

<TABLE>
<CAPTION>
                                                 ADDITIONAL SECURITIES
SHARES HELD OF RECORD  OPTIONS AND OTHER RIGHTS   BENEFICIALLY OWNED
---------------------  ------------------------  ---------------------
<S>                    <C>                       <C>
</TABLE>

                                       B-7
<PAGE>   177

                                   EXHIBIT A

                           FORM OF IRREVOCABLE PROXY

     The undersigned stockholder of Molecular Devices Corporation, a Delaware
corporation ("PARENT") hereby irrevocably (to the fullest extent permitted by
law) appoints and constitutes [               ] and LJL BioSystems, Inc., a
Delaware corporation (the "COMPANY"), and each of them, the attorneys and
proxies of the undersigned with full power of substitution and resubstitution,
to the full extent of the undersigned's rights, for the limited purposes set
forth herein, with respect to (i) the outstanding shares of capital stock of
Parent owned of record by the undersigned as of the date of this proxy, which
shares are specified on the final page of this proxy, and (ii) any and all other
shares of capital stock of Parent which the undersigned may acquire of record on
or after the date hereof. (The shares of the capital stock of Parent referred to
in clauses "(i)" and "(ii)" of the immediately preceding sentence are
collectively referred to as the "SHARES.") Upon the execution hereof, all prior
proxies given by the undersigned with respect to any of the Shares are hereby
revoked, and the undersigned agrees that no subsequent proxies will be given
with respect to any of the Shares.

     This proxy is irrevocable, is coupled with an interest and is granted in
connection with the Parent Voting Agreement, dated as of the date hereof,
between the Company and the undersigned (the "PARENT VOTING AGREEMENT"), and is
granted in consideration of the Company entering into the Agreement and Plan of
Merger and Reorganization, dated as of the date hereof, among Parent, Merger Sub
and the Company (the "REORGANIZATION AGREEMENT").

     The attorneys and proxies named above will be empowered, and may exercise
this proxy, to vote the Shares at any time until the earlier to occur of the
valid termination of the Reorganization Agreement or the effective time of the
merger contemplated thereby (the "MERGER") at any meeting of the stockholders of
Parent at which matters relating to the Merger, the Reorganization Agreement or
any actions contemplated thereby, however called, or in connection with any
solicitation of written consents from stockholders of Parent, in favor of the
approval of the issuance of shares of Parent Common Stock in the Merger, in
favor of the election of Lev J. Leytes to the Board of Directors of Parent, and
in favor of each of the other actions contemplated by the Reorganization
Agreement.

     The undersigned may vote the Shares on all other matters.

     This proxy shall be binding upon the heirs, estate, executors, personal
representatives, successors and assigns of the undersigned (including any
transferee of any of the Shares).

     If any provision of this proxy or any part of any such provision is held
under any circumstances to be invalid or unenforceable in any jurisdiction, then
(a) such provision or part thereof shall, with respect to such circumstances and
in such jurisdiction, be deemed amended to conform to applicable laws so as to
be valid and enforceable to the fullest possible extent, (b) the invalidity or
unenforceability of such provision or part thereof under such circumstances and
in such jurisdiction shall not affect the validity or enforceability of such
provision or part thereof under any other circumstances or in any other
jurisdiction, and (c) the invalidity or unenforceability of such provision or
part thereof shall not affect the validity or enforceability of the remainder of
such provision or the validity or enforceability of any other provision of this
proxy. Each provision of this proxy is separable from every other provision of
this proxy, and each part of each provision of this proxy is separable from
every other part of such provision.

                                       B-8
<PAGE>   178

     This proxy shall terminate upon the earlier of the valid termination of the
Reorganization Agreement or the effective time of the Merger.

Dated: June   , 2000.

                                          --------------------------------------
                                                       (Signature)

                                          --------------------------------------
                                                       (Print Name)

                                          NUMBER OF SHARES OF COMMON STOCK OF
                                          PARENT OWNED OF RECORD AS OF THE DATE
                                          OF THIS PROXY:

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

                                       B-9
<PAGE>   179

                                                                         ANNEX C

                            COMPANY VOTING AGREEMENT

     THIS COMPANY VOTING AGREEMENT is entered into as of June   , 2000, by and
between MOLECULAR DEVICES CORPORATION, a Delaware corporation ("PARENT"), and
               ("STOCKHOLDER").

                                    RECITALS

     A.  Parent, Mercury Acquisition Sub, Inc., a Delaware corporation and a
wholly owned subsidiary of Parent ("MERGER SUB"), and LJL BioSystems, Inc., a
Delaware corporation (the "COMPANY"), are entering into an Agreement and Plan of
Merger and Reorganization of even date herewith (the "REORGANIZATION AGREEMENT")
which provides (subject to the conditions set forth therein) for the merger of
Merger Sub into the Company (the "MERGER").

     B.  In order to induce Parent and Merger Sub to enter into the
Reorganization Agreement, Stockholder is entering into this Company Voting
Agreement.

                                   AGREEMENT

     The parties to this Company Voting Agreement, intending to be legally
bound, agree as follows:

SECTION 1.  CERTAIN DEFINITIONS

     For purposes of this Company Voting Agreement:

     (a) "COMPANY COMMON STOCK" shall mean the common stock, par value $0.01 per
share, of the Company.

     (b) "EXPIRATION DATE" shall mean the earlier of (i) the date upon which the
Reorganization Agreement is validly terminated, or (ii) the date upon which the
Merger becomes effective.

     (c) Stockholder shall be deemed to "OWN" or to have acquired "Ownership" of
a security if Stockholder: (i) is the record owner of such security; or (ii) is
the "beneficial owner" (within the meaning of Rule 13d-3 under the Securities
Exchange Act of 1934) of such security.

     (d) "PERSON" shall mean any (i) individual, (ii) corporation, limited
liability company, partnership or other entity, or (iii) governmental authority.

     (e) "SUBJECT SECURITIES" shall mean: (i) all securities of the Company
(including all shares of Company Common Stock and all options, warrants and
other rights to acquire shares of Company Common Stock) Owned by Stockholder as
of the date of this Agreement; and (ii) all additional securities of the Company
(including all additional shares of Company Common Stock and all additional
options, warrants and other rights to acquire shares of Company Common Stock) of
which Stockholder acquires Ownership during the period from the date of this
Agreement through the Expiration Date.

     (f) A Person shall be deemed to have a effected a "TRANSFER" of a security
if such Person directly or indirectly: (i) sells, pledges, encumbers, grants an
option with respect to, transfers or disposes of such security or any interest
in such security; or (ii) enters into an agreement or commitment contemplating
the possible sale of, pledge of, encumbrance of, grant of an option with respect
to, transfer of or disposition of such security or any interest therein.

SECTION 2.  TRANSFER OF SUBJECT SECURITIES

     2.1  TRANSFEREE OF SUBJECT SECURITIES TO BE BOUND BY THIS
AGREEMENT.  Stockholder agrees that, during the period from the date of this
Company Voting Agreement through the Expiration Date, Stockholder shall not
cause or permit any Transfer of any of the Subject Securities to be effected
unless

                                       C-1
<PAGE>   180

each Person to which any of such Subject Securities, or any interest in any of
such Subject Securities, is or may be transferred shall have: (a) executed a
counterpart of this Company Voting Agreement and a proxy in the form attached
hereto as Exhibit A (with such modifications as Parent may reasonably request);
and (b) agreed to hold such Subject Securities (or interest in such Subject
Securities) subject to all of the terms and provisions of this Company Voting
Agreement; provided, however, that nothing contained herein will be deemed to
restrict the exercise by Stockholder of options to acquire Company Common Stock.

     2.2  TRANSFER OF VOTING RIGHTS.  Stockholder agrees that, during the period
from the date of this Company Voting Agreement through the Expiration Date, so
long as such shares are Owned by Stockholder, Stockholder shall ensure that: (a)
none of the Subject Securities is deposited into a voting trust; and (b) except
pursuant to this Company Voting Agreement, no proxy is granted, and no voting
agreement or similar agreement is entered into, with respect to any of the
Subject Securities.

SECTION 3.  VOTING OF SHARES

     3.1  VOTING AGREEMENT.  Stockholder agrees that, during the period from the
date of this Company Voting Agreement through the Expiration Date:

          (a) at any meeting of stockholders of the Company at which matters
     relating to the Merger, the Reorganization Agreement or any actions
     contemplated thereby, however called, Stockholder shall (unless otherwise
     directed in writing by Parent) cause all outstanding shares of Company
     Common Stock that are Owned by Stockholder as of the record date fixed for
     such meeting to be voted in favor of the approval and adoption of the
     Reorganization Agreement and the approval of the Merger, and in favor of
     each of the other actions contemplated by the Reorganization Agreement; and

          (b) in the event written consents are solicited or otherwise sought
     from stockholders of the Company with respect to the approval or adoption
     of the Reorganization Agreement, with respect to the approval of the Merger
     or with respect to any of the other actions contemplated by the
     Reorganization Agreement, Stockholder shall (unless otherwise directed in
     writing by Parent) cause to be executed, with respect to all shares of
     Company Common Stock that are Owned by Stockholder as of the record date
     fixed for the consent to the proposed action, a written consent or written
     consents to such proposed action.

     3.2  This Company Voting Agreement is intended to bind Stockholder only
with respect to the specific matters set forth herein, and shall not prohibit
Stockholder from acting in accordance with his fiduciary duties as an officer or
director of the Company. Stockholder will retain at all times the right to vote
the Stockholder's Subject Securities, in Stockholder's sole discretion, on all
matters other than those set forth in this Section 3.1 which are at any time or
from time to time presented to the Company's stockholders generally.

     3.3 PROXY.  Contemporaneously with the execution of this Company Voting
Agreement: (i) Stockholder shall deliver to Parent a proxy in the form attached
to this Company Voting Agreement as Exhibit A, which shall be irrevocable to the
fullest extent permitted by law, with respect to the shares referred to therein
(the "PROXY"); and (ii) Stockholder shall use his, her or its reasonable best
efforts to cause to be delivered to Parent an additional proxy (in the form
attached hereto as Exhibit A) executed on behalf of the record owner of any
outstanding shares of Company Common Stock that are owned beneficially (within
the meaning of Rule 13d-3 under the Securities Exchange Act of 1934), but not of
record, by Stockholder.

SECTION 4.  WAIVER OF APPRAISAL RIGHTS

     Stockholder hereby irrevocably and unconditionally waives, and agrees to
cause to be waived and to prevent the exercise of, any rights of appraisal, any
dissenters' rights and any similar rights relating to the Merger or any related
transaction that Stockholder or any other Person may have by virtue of the
ownership of any outstanding shares of Company Common Stock or other security
Owned by Stockholder.

                                       C-2
<PAGE>   181

SECTION 5.  NO SOLICITATION

     Stockholder agrees that, during the period from the date of this Company
Voting Agreement through the Expiration Date, Stockholder shall not, directly or
indirectly, and Stockholder shall ensure that his Representatives (as defined in
the Reorganization Agreement) do not, directly or indirectly: (i) solicit,
initiate, encourage or induce the making, submission or announcement of any
Acquisition Proposal (as defined in the Reorganization Agreement) or take any
action that could reasonably be expected to lead to an Acquisition Proposal;
(ii) furnish any non-public information regarding the Company or any direct or
indirect subsidiary of the Company to any Person in connection with or in
response to an Acquisition Proposal or potential Acquisition Proposal; or (iii)
engage in discussions with any Person with respect to any Acquisition Proposal.
Stockholder shall immediately cease and discontinue, and Stockholder shall
ensure that his Representatives immediately cease and discontinue, any existing
discussions with any Person that relate to any Acquisition Proposal. The
restrictions and covenants in this Section 5 shall apply to Stockholder only in
his capacity as a stockholder and not to Stockholder in his capacity as a
director or officer of the Company.

SECTION 6.  REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER

     Stockholder hereby represents and warrants to Parent as follows:

     6.1  AUTHORIZATION, ETC.  Stockholder has the right, power, authority and
capacity to execute and deliver this Company Voting Agreement and the Proxy and
to perform his obligations hereunder and thereunder. This Company Voting
Agreement and the Proxy have been duly executed and delivered by Stockholder
and, assuming the due authorization, execution, and delivery by Parent,
constitute legal, valid and binding obligations of Stockholder, enforceable
against Stockholder in accordance with their terms, subject to (i) laws of
general application relating to bankruptcy, insolvency and the relief of
debtors, and (ii) rules of law governing specific performance, injunctive relief
and other equitable remedies.

     6.2  NO CONFLICTS OR CONSENTS

     (a) The execution and delivery of this Company Voting Agreement and the
Proxy by Stockholder do not, and the performance of this Company Voting
Agreement and the Proxy by Stockholder will not: (i) conflict with or violate
any law, rule, regulation, order, decree or judgment applicable to Stockholder
or by which he or any of his properties is or may be bound or affected; or (ii)
result in or constitute (with or without notice or lapse of time) any breach of
or default under, or give to any other Person (with or without notice or lapse
of time) any right of termination, amendment, acceleration or cancellation of,
or result (with or without notice or lapse of time) in the creation of any
encumbrance or restriction on any of the Subject Securities pursuant to, any
contract to which Stockholder is a party or by which Stockholder or any of his
affiliates or properties is or may be bound or affected.

     (b) The execution and delivery of this Company Voting Agreement and the
Proxy by Stockholder do not, and the performance of this Company Voting
Agreement and the Proxy by Stockholder will not, require any consent or approval
of any Person.

     6.3  TITLE TO SECURITIES.  As of the date of this Company Voting Agreement:
(a) Stockholder holds of record (free and clear of any encumbrances or
restrictions) the number of outstanding shares of Company Common Stock set forth
under the heading "Shares Held of Record" on the signature page hereof; (b)
Stockholder holds (free and clear of any encumbrances or restrictions) the
options, warrants and other rights to acquire shares of Company Common Stock set
forth under the heading "Options and Other Rights" on the signature page hereof;
(c) Stockholder Owns the additional securities of the Company set forth under
the heading "Additional Securities Beneficially Owned" on the signature page
hereof; and (d) Stockholder does not directly or indirectly Own any shares of
capital stock or other securities of the Company, or any option, warrant or
other right to acquire (by purchase, conversion or otherwise) any shares of
capital stock or other securities of the Company, other than the shares and
options, warrants and other rights set forth on the signature page hereof.

                                       C-3
<PAGE>   182

     6.4  ACCURACY OF REPRESENTATIONS.  The representations and warranties
contained in this Company Voting Agreement are accurate in all respects as of
the date of this Company Voting Agreement, will be accurate in all respects at
all times through the Expiration Date and will be accurate in all respects as of
the date of the consummation of the Merger as if made on that date (except with
respect to the representations set forth in Section 6.3 in cases where
Stockholder has Transferred shares of Company Common Stock in accordance with
the terms and provisions of Section 2 of this Company Voting Agreement).

SECTION 7.  ADDITIONAL COVENANTS OF STOCKHOLDER

     7.1  FURTHER ASSURANCES.  From time to time and without additional
consideration, Stockholder shall (at Parent's expense) execute and deliver, or
cause to be executed and delivered, such additional transfers, assignments,
endorsements, proxies, consents and other instruments, and shall (at Parent's
expense) take such further actions, as Parent may reasonably request for the
purpose of carrying out and furthering the intent of this Company Voting
Agreement.

     7.2  LEGEND.  As soon as practicable after the execution of this Company
Voting Agreement (and from time to time upon the acquisition by Stockholder of
Ownership of any shares of Company Common Stock prior to the Expiration Date),
Stockholder shall submit to the Company's transfer agent each certificate
evidencing any outstanding shares of Company Common Stock or other securities of
the Company Owned by Stockholder and instruct that such certificate be imprinted
with a legend in the following form:

              THE SECURITY OR SECURITIES REPRESENTED BY THIS
         CERTIFICATE MAY NOT BE SOLD, EXCHANGED OR OTHERWISE
         TRANSFERRED OR DISPOSED OF EXCEPT IN COMPLIANCE WITH THE TERMS
         AND PROVISIONS OF THE COMPANY VOTING AGREEMENT DATED AS OF
         JUNE   , 2000 BETWEEN MOLECULAR DEVICES CORPORATION AND
                             , AS IT MAY BE AMENDED, A COPY OF WHICH IS
         ON FILE AT THE PRINCIPAL EXECUTIVE OFFICES OF MOLECULAR
         DEVICES CORPORATION.

SECTION 8.  MISCELLANEOUS

     8.1  EXPENSES.  Except as contemplated by Section 7.1 All costs and
expenses incurred in connection with the transactions contemplated by this
Company Voting Agreement shall be paid by the party incurring such costs and
expenses.

     8.2  NOTICES.  Any notice or other communication required or permitted to
be delivered to either party under this Company Voting Agreement shall be in
writing and shall be deemed properly delivered, given and received (a) upon
receipt when delivered by hand, or (b) two business days after sent by courier
or express delivery service or by facsimile, provided that in each case the
notice or other communication is sent to the address or facsimile telephone
number set forth beneath the name of such

                                       C-4
<PAGE>   183

party below (or to such other address or facsimile telephone number as such
party shall have specified in a written notice given to the other party):

        IF TO STOCKHOLDER:

           at the address set forth below Stockholder's signature on the
           signature page hereof

        WITH A COPY TO:

           Venture Law Group
           2800 Sand Hill Road
           Menlo Park, CA 94025
           Palo Alto, CA 94306
           Attn: Mark Weeks and
           Steven Tonsfeldt
           Facsimile: (650) 233-8386

        IF TO PARENT:

           Molecular Devices Corporation
           1311 Orleans Drive
           Sunnyvale, CA 94089
           Attn: Joseph D. Keegan, Ph.D.
           Tel: (408) 747-1700
           Fax: (408) 747-3699

     8.3  SEVERABILITY.  If any provision of this Company Voting Agreement or
any part of any such provision is held under any circumstances to be invalid or
unenforceable in any jurisdiction, then (a) such provision or part thereof
shall, with respect to such circumstances and in such jurisdiction, be deemed
amended to conform to applicable laws so as to be valid and enforceable to the
fullest possible extent, (b) the invalidity or unenforceability of such
provision or part thereof under such circumstances and in such jurisdiction
shall not affect the validity or enforceability of such provision or part
thereof under any other circumstances or in any other jurisdiction, and (c) the
invalidity or unenforceability of such provision or part thereof shall not
affect the validity or enforceability of the remainder of such provision or the
validity or enforceability of any other provision of this Company Voting
Agreement. Each provision of this Company Voting Agreement is separable from
every other provision of this Company Voting Agreement, and each part of each
provision of this Company Voting Agreement is separable from every other part of
such provision.

     8.4  ENTIRE AGREEMENT.  This Company Voting Agreement, the Proxy and any
other documents delivered by the parties in connection herewith constitute the
entire agreement between the parties with respect to the subject matter hereof
and thereof and supersede all prior agreements and understandings between the
parties with respect thereto. No addition to or modification of any provision of
this Company Voting Agreement or the Proxy shall be binding upon either party
unless made in writing and signed by both parties.

     8.5  ASSIGNMENT; BINDING EFFECT.  Except as provided herein, neither this
Company Voting Agreement nor any of the interests or obligations hereunder may
be assigned or delegated by Stockholder and any attempted or purported
assignment or delegation of any of such interests or obligations shall be void.
Subject to the preceding sentence, this Company Voting Agreement shall be
binding upon Stockholder and his heirs, estate, executors, personal
representatives, successors and assigns, and shall inure to the benefit of
Parent and its successors and assigns. Without limiting any of the restrictions
set forth in Section 2 or elsewhere in this Company Voting Agreement, this
Company Voting Agreement shall be binding upon any Person to whom any Subject
Securities are transferred. Nothing in this Company Voting Agreement is intended
to confer on any Person (other than Parent and its successors and assigns) any
rights or remedies of any nature.

                                       C-5
<PAGE>   184

     8.6  SPECIFIC PERFORMANCE.  The parties agree that irreparable damage would
occur in the event that any of the provisions of this Company Voting Agreement
or the Proxy was not performed in accordance with its specific terms or was
otherwise breached. Stockholder agrees that, in the event of any breach or
threatened breach by Stockholder of any covenant or obligation contained in this
Company Voting Agreement or in the Proxy, Parent shall be entitled (in addition
to any other remedy that may be available to it, including monetary damages) to
seek and obtain (a) a decree or order of specific performance to enforce the
observance and performance of such covenant or obligation, and (b) an injunction
restraining such breach or threatened breach. Stockholder further agrees that
neither Parent nor any other Person shall be required to obtain, furnish or post
any bond or similar instrument in connection with or as a condition to obtaining
any remedy referred to in this Section 8.6, and Stockholder irrevocably waives
any right he may have to require the obtaining, furnishing or posting of any
such bond or similar instrument.

     8.7  NON-EXCLUSIVITY.  The rights and remedies of Parent under this Company
Voting Agreement are not exclusive of or limited by any other rights or remedies
which it may have, whether at law, in equity, by contract or otherwise, all of
which shall be cumulative (and not alternative). Without limiting the generality
of the foregoing, the rights and remedies of Parent under this Company Voting
Agreement, and the obligations and liabilities of Stockholder under this Company
Voting Agreement, are in addition to their respective rights, remedies,
obligations and liabilities under common law requirements and under all
applicable statutes, rules and regulations. Nothing in this Company Voting
Agreement shall limit any of Stockholder's obligations, or the rights or
remedies of Parent, under any Affiliate Agreement between Parent and
Stockholder; and nothing in any such Affiliate Agreement shall limit any of
Stockholder's obligations, or any of the rights or remedies of Parent, under
this Company Voting Agreement.

     8.8  GOVERNING LAW; VENUE.

     (a) This Company Voting Agreement and the Proxy shall be construed in
accordance with, and governed in all respects by, the laws of the State of
Delaware (without giving effect to principles of conflicts of laws).

     (b) Any legal action or other legal proceeding relating to this Company
Voting Agreement or the Proxy or the enforcement of any provision of this
Company Voting Agreement or the Proxy may be brought or otherwise commenced in
any state or federal court located in the County of Santa Clara, California.
Stockholder: (i) expressly and irrevocably consents and submits to the
jurisdiction of each state and federal court located in the County of Santa
Clara, California (and each appellate court located in the State of California),
in connection with any such legal proceeding; (ii) agrees that service of any
process, summons, notice or document by U.S. mail addressed to him at the
address set forth in Section 8.2 shall constitute effective service of such
process, summons, notice or document for purposes of any such legal proceeding;
(iii) agrees that each state and federal court located in the County of Santa
Clara, California, shall be deemed to be a convenient forum; and (iv) agrees not
to assert (by way of motion, as a defense or otherwise), in any such legal
proceeding commenced in any state or federal court located in the County of
Santa Clara, California, any claim that Stockholder is not subject personally to
the jurisdiction of such court, that such legal proceeding has been brought in
an inconvenient forum, that the venue of such proceeding is improper or that
this Company Voting Agreement or the subject matter of this Company Voting
Agreement may not be enforced in or by such court. Nothing contained in this
Section 8.8(b) shall be deemed to limit or otherwise affect the right of Parent
to commence any legal proceeding or otherwise proceed against Stockholder in any
other forum or jurisdiction.

     (c) STOCKHOLDER IRREVOCABLY WAIVES THE RIGHT TO A JURY TRIAL IN CONNECTION
WITH ANY LEGAL PROCEEDING RELATING TO THIS COMPANY VOTING AGREEMENT OR THE PROXY
OR THE ENFORCEMENT OF ANY PROVISION OF THIS COMPANY VOTING AGREEMENT OR THE
PROXY.

     8.9  COUNTERPARTS.  This Company Voting Agreement may be executed by the
parties in separate counterparts, each of which when so executed and delivered
shall be an original, but all such counterparts shall together constitute one
and the same instrument.

                                       C-6
<PAGE>   185

     8.10  CAPTIONS.  The captions contained in this Company Voting Agreement
are for convenience of reference only, shall not be deemed to be a part of this
Company Voting Agreement and shall not be referred to in connection with the
construction or interpretation of this Company Voting Agreement.

     8.11  ATTORNEYS' FEES.  If any legal action or other legal proceeding
relating to this Company Voting Agreement or the enforcement of any provision of
this Company Voting Agreement is brought by one party against the other party,
the prevailing party shall be entitled to recover reasonable attorneys' fees,
costs and disbursements (in addition to any other relief to which the prevailing
party may be entitled).

     8.12  WAIVER.  No failure on the part of Parent to exercise any power,
right, privilege or remedy under this Company Voting Agreement, and no delay on
the part of Parent in exercising any power, right, privilege or remedy under
this Company Voting Agreement, shall operate as a waiver of such power, right,
privilege or remedy; and no single or partial exercise of any such power, right,
privilege or remedy shall preclude any other or further exercise thereof or of
any other power, right, privilege or remedy. Parent shall not be deemed to have
waived any claim available to Parent arising out of this Company Voting
Agreement, or any power, right, privilege or remedy of Parent under this Company
Voting Agreement, unless the waiver of such claim, power, right, privilege or
remedy is expressly set forth in a written instrument duly executed and
delivered on behalf of Parent; and any such waiver shall not be applicable or
have any effect except in the specific instance in which it is given.

     8.13  CONSTRUCTION.

     (a) For purposes of this Company Voting Agreement, whenever the context
requires: the singular number shall include the plural, and vice versa; the
masculine gender shall include the feminine and neuter genders; the feminine
gender shall include the masculine and neuter genders; and the neuter gender
shall include masculine and feminine genders.

     (b) The parties agree that any rule of construction to the effect that
ambiguities are to be resolved against the drafting party shall not be applied
in the construction or interpretation of this Company Voting Agreement.

     (c) As used in this Company Voting Agreement, the words "include" and
"including," and variations thereof, shall not be deemed to be terms of
limitation, but rather shall be deemed to be followed by the words "without
limitation."

     (d) Except as otherwise indicated, all references in this Company Voting
Agreement to "Sections" and "Exhibits" are intended to refer to Sections of this
Company Voting Agreement and Exhibits to this Company Voting Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       C-7
<PAGE>   186

     IN WITNESS WHEREOF, Parents and Stockholder have caused this Company Voting
Agreement to be executed as of the date first written above.

                                          MOLECULAR DEVICES CORPORATION

                                          By:
                                          --------------------------------------
                                                        (Signature)

                                            ------------------------------------
                                                        (Print Name)

                                          STOCKHOLDER

                                          --------------------------------------
                                                       (Signature)

                                          --------------------------------------
                                                       (Print Name)

                                          Address:
                                          --------------------------------------

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

                                          Facsimile:
                                          --------------------------------------

<TABLE>
<CAPTION>
                                                 ADDITIONAL SECURITIES
SHARES HELD OF RECORD  OPTIONS AND OTHER RIGHTS   BENEFICIALLY OWNED
---------------------  ------------------------  ---------------------
<S>                    <C>                       <C>
</TABLE>

                                       C-8
<PAGE>   187

                                   EXHIBIT A

                           FORM OF IRREVOCABLE PROXY

     The undersigned stockholder of LJL BioSystems, Inc., a Delaware corporation
(the "COMPANY"), hereby irrevocably (to the fullest extent permitted by law)
appoints and constitutes [               ] and Molecular Devices Corporation, a
Delaware corporation ("PARENT"), and each of them, the attorneys and proxies of
the undersigned with full power of substitution and resubstitution, to the full
extent of the undersigned's rights, for the limited purposes set forth herein,
with respect to (i) the outstanding shares of capital stock of the Company owned
of record by the undersigned as of the date of this proxy, which shares are
specified on the final page of this proxy, and (ii) any and all other shares of
capital stock of the Company which the undersigned may acquire of record on or
after the date hereof. (The shares of the capital stock of the Company referred
to in clauses "(i)" and "(ii)" of the immediately preceding sentence are
collectively referred to as the "SHARES.") Upon the execution hereof, all prior
proxies given by the undersigned with respect to any of the Shares are hereby
revoked, and the undersigned agrees that no subsequent proxies will be given
with respect to any of the Shares.

     This proxy is irrevocable, is coupled with an interest and is granted in
connection with the Company Voting Agreement, dated as of the date hereof,
between Parent and the undersigned (the "COMPANY VOTING AGREEMENT"), and is
granted in consideration of Parent entering into the Agreement and Plan of
Merger and Reorganization, dated as of the date hereof, among Parent, Merger Sub
and the Company (the "REORGANIZATION AGREEMENT").

     The attorneys and proxies named above will be empowered, and may exercise
this proxy, to vote the Shares at any time until the earlier to occur of the
valid termination of the Reorganization Agreement or the effective time of the
merger contemplated thereby (the "MERGER") at any meeting of the stockholders of
the Company at which matters relating to the Merger, the Reorganization
Agreement or any actions contemplated thereby, however called, or in connection
with any solicitation of written consents from stockholders of the Company, in
favor of the approval and adoption of the Reorganization Agreement and the
approval of the Merger, and in favor of each of the other actions contemplated
by the Reorganization Agreement.

     The undersigned may vote the Shares on all other matters.

     This proxy shall be binding upon the heirs, estate, executors, personal
representatives, successors and assigns of the undersigned (including any
transferee of any of the Shares).

     If any provision of this proxy or any part of any such provision is held
under any circumstances to be invalid or unenforceable in any jurisdiction, then
(a) such provision or part thereof shall, with respect to such circumstances and
in such jurisdiction, be deemed amended to conform to applicable laws so as to
be valid and enforceable to the fullest possible extent, (b) the invalidity or
unenforceability of such provision or part thereof under such circumstances and
in such jurisdiction shall not affect the validity or enforceability of such
provision or part thereof under any other circumstances or in any other
jurisdiction, and (c) the invalidity or unenforceability of such provision or
part thereof shall not affect the validity or enforceability of the remainder of
such provision or the validity or enforceability of any other provision of this
proxy. Each provision of this proxy is separable from every other provision of
this proxy, and each part of each provision of this proxy is separable from
every other part of such provision.

                                       C-9
<PAGE>   188

     This proxy shall terminate upon the earlier of the valid termination of the
Reorganization Agreement or the effective time of the Merger.

Dated: June   , 2000

                                          --------------------------------------
                                                       (Signature)

                                          --------------------------------------
                                                       (Print Name)

                                          NUMBER OF SHARES OF COMMON STOCK OF
                                          THE COMPANY OWNED OF RECORD AS OF THE
                                          DATE OF THIS PROXY:

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

                                      C-10
<PAGE>   189

                                                                         ANNEX D

June 7, 2000

Board of Directors
LJL BioSystems, Inc.
404 Tasman Drive
Sunnyvale, CA 94089

Gentlemen and Madam:

     We understand that LJL BioSystems, Inc. ("LJL" or the "Company"), Molecular
Devices Corporation ("MDC") and Mercury Acquisition Sub, Inc., a wholly owned
subsidiary of MDC ("Merger Sub"), propose to enter into an Agreement and Plan of
Merger and Reorganization, dated as of June 7, 2000 (the "Merger Agreement"),
which provides, among other things, for the merger (the "Merger") of Merger Sub
with and into LJL, with LJL as the surviving corporation of the Merger. Pursuant
to the Merger, LJL will become a wholly owned subsidiary of MDC, and each issued
and outstanding share of common stock, par value $.001 per share (the "LJL
Common Stock") of LJL, other than shares held in treasury, will be converted
into the right to receive 0.30 of a share (the "Exchange Ratio") of common
stock, par value $.001 per share ("the MDC Common Stock") of MDC. The terms and
conditions of the Merger are more fully set forth in the Merger Agreement.

     You have asked for our opinion as to whether the Exchange Ratio is fair
from a financial point of view to the stockholders of LJL.

     For purposes of the opinion set forth herein, we have:

       (i) reviewed certain publicly available financial statements and other
           information of the Company and MDC;

      (ii) reviewed certain internal financial statements and other financial
           and operating data concerning the Company prepared by the management
           of the Company;

      (iii) analyzed certain financial projections prepared by the management of
            the Company;

      (iv) discussed the past and current operations and financial condition and
           the prospects of the Company with senior executives of the Company;

       (v) analyzed certain internal financial statements and other financial
           and operating data concerning MDC prepared by the management of MDC;

      (vi) discussed the past and current operations and financial condition and
           the prospects of MDC with senior executives of MDC, and reviewed the
           pro forma financial impact of the Merger on MDC;

      (vii) analyzed certain financial projections prepared by the management of
            MDC;

     (viii) reviewed the reported prices and trading activity for the LJL Common
            Stock and the MDC Common Stock;

      (ix) compared the financial performance of the Company and MDC and the
           prices and trading activity of the LJL Common Stock and the MDC
           Common Stock with that of certain other comparable publicly traded
           companies and their securities;

       (x) reviewed the financial terms, to the extent publicly available, of
           certain comparable acquisition transactions;

      (xi) reviewed a draft of the Merger Agreement and certain related
           documents; and

      (xii) performed such other analyses and considered such other factors as
            we have deemed appropriate.

                                       D-1
<PAGE>   190

     We have assumed and relied upon without independent verification the
accuracy and completeness of the financial and other information reviewed by us
for the purposes of this opinion. With respect to the financial projections, we
have assumed that they have been reasonably prepared on bases reflecting the
best currently available estimates and judgments of the senior management of LJL
and MDC as to the future financial performance of LJL and MDC. We have relied
upon without independent verification the assumptions of the management of LJL
and MDC regarding the pro forma financial impact of the merger on MDC. We assume
no responsibility for and express no view as to such forecasts and pro forma
analyses or the assumptions on which they are based, and we have relied upon the
assurances of the senior management of LJL and MDC that they are unaware of any
facts that would make the information provided to or reviewed by us incomplete
or misleading. We have not made any independent valuation or appraisal of the
assets or liabilities of LJL or MDC, nor have we been furnished with any such
valuations or appraisals. We have assumed that the Merger will be treated as a
"pooling-of-interests" business combination in accordance with U.S. generally
accepted accounting principles and will qualify as a "reorganization" within the
meaning of Section 368(a) of the Internal Revenue Code of 1986. We have also
assumed that the Merger will be consummated in accordance with the terms set
forth in the Merger Agreement and that all of the representations and warranties
of the parties to the Merger Agreement are true, that the covenants of each
party to the Merger Agreement will be fully complied with, and that all
conditions to the Merger set forth in the Merger Agreement will be satisfied and
not waived. In addition, we have taken into account our past efforts to solicit
interest from potential third party acquirors, although we were not requested to
solicit interest from third parties in connection with the proposed Merger. Our
opinion is necessarily based on economic, market and other conditions as in
effect on, and the information made available to us as of, the date hereof. It
should be understood that, although subsequent developments may affect this
opinion, we do not have any obligation to update, revise or reaffirm this
opinion.

     Our opinion addresses only the fairness from a financial point of view to
the stockholders of the Company of the Exchange Ratio, and we do not express any
view as to any other term of the proposed Merger or the transactions
contemplated by the Merger Agreement. Our opinion does not address the Company's
underlying business decision to effect the transactions contemplated by the
Merger Agreement.

     We have acted as financial advisor to the Board of Directors of LJL in
connection with this transaction and will receive a fee for our services, which
will be paid only upon the consummation of the Merger. In addition, the Company
has agreed to indemnify us for certain liabilities arising out of our
engagement.

     It is understood that this letter is for the information of the Board of
Directors of LJL only and may not be used for any other purpose without our
prior written consent. In addition, this opinion does not in any manner address
the prices at which the LJL Common Stock or MDC Common Stock will trade
following announcement or consummation of the Merger, and Gleacher & Co.
expresses no opinion or recommendation as to how the stockholders of LJL or MDC
should vote at stockholder's meetings in connection with the Merger.

                                       D-2
<PAGE>   191

     Based upon and subject to the foregoing, we are of the opinion on the date
hereof that the Exchange Ratio pursuant to the Merger Agreement is fair to
holders of LJL Common Stock from a financial point of view.

                                          Very truly yours,

                                          GLEACHER & CO. LLC

                                          By: /s/ H. CONRAD MEYER III
                                            ------------------------------------
                                              H. Conrad Meyer III
                                              Managing Director

                                       D-3
<PAGE>   192

                                                                         ANNEX E

June 6, 2000

Board of Directors
Molecular Devices Corporation
1311 Orleans Drive
Sunnyvale, California 94089-1136

Gentlemen:

     We understand that Molecular Devices Corporation ("Molecular"), Mercury
Acquisition Sub, Inc. (the "Merger Subsidiary"), a wholly-owned subsidiary of
Molecular, and LJL BioSystems, Inc. (the "Company") intend to enter into an
Agreement and Plan of Merger and Reorganization (the "Agreement"), pursuant to
which, and subject to certain conditions precedent, the Merger Subsidiary will
merge with and into the Company (the "Proposed Transaction"). Under the terms of
the Agreement, each outstanding share of the Company's common stock would be
converted into 0.30 shares of Molecular common stock (the "Exchange Ratio"). In
addition, as a result of the consummation of the Proposed Transaction, each
outstanding option and warrant to purchase common stock of the Company would be
converted into options and warrants to purchase common stock of Molecular based
upon the Exchange Ratio applied to the Company's common stock. The terms and
conditions of the Proposed Transaction are set forth in more detail in the
Agreement.

     You have requested our opinion, as investment bankers, as to the fairness,
from a financial point of view, to the stockholders of Molecular of the Exchange
Ratio offered in the Proposed Transaction.

     We have acted as financial advisor to Molecular in connection with the
Proposed Transaction and will receive a fee for our services. As you are aware,
our firm is a full service securities firm that engages in securities trading
and brokerage activities, in addition to providing investment banking services.
We have in the past provided financial advisory and financial services to
Molecular and have received fees for the rendering of such services and may
continue to render similar services and receive related fees in the future. In
the ordinary course of our business, we may trade or otherwise effect
transactions in the securities of Molecular and, accordingly, may at any time
hold a long or short position in such securities.

     In conducting our analysis and arriving at our opinion as expressed herein,
we have reviewed and analyzed, among other things, the following:

          (i) a draft of the Agreement and certain related documents and the
     financial terms of the Proposed Transaction set forth therein;

          (ii) the Company's Annual Report on Form 10-K for the fiscal year
     ended December 31, 1999, the Company's Quarterly Reports on Form 10-Q for
     the quarters ended March 31, 1999 and March 31, 2000, the Company's
     Registration Statement on Form S-1 file number 333-43529 and the Company's
     Registration Statement on Form S-3 file number 333-32378;

          (iii) Molecular's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1999, Molecular's Quarterly Reports on Form 10-Q for the
     quarters ended March 31, 1999 and March 31, 2000 and the Company's
     Registration Statement on Form S-3 file number 333-32734;

          (iv) certain other publicly available information concerning the
     Company and Molecular and the trading market for their common stock;

          (v) certain internal information and other data relating to the
     Company and Molecular and their business and prospects provided to us by
     management of Molecular and the Company;

          (vi) certain publicly available information concerning certain other
     companies engaged in businesses which we believe to be generally comparable
     to the Company and Molecular and the trading markets for certain of such
     other companies' securities;

                                       E-1
<PAGE>   193

          (vii) the financial terms of certain recent business combinations
     which we believe to be relevant;

          (viii) discounted cash flow analysis with financial information
     provided to us by management of Molecular and the Company; and

          (ix) certain discussions and negotiations among representatives of the
     Company and Molecular and their financial and legal advisors.

We have also met with certain officers and employees of Molecular and the
Company concerning their businesses and operations, assets, present condition
and prospects, and we undertook such other studies, analyses and investigations,
as we deemed appropriate.

     In arriving at our opinion, we have assumed and relied upon the accuracy
and completeness of the financial and other information used by us and have not
attempted independently to verify such information, nor do we assume any
responsibility to do so. We have assumed that the financial forecasts and
projections provided to or reviewed by us have been reasonably prepared based on
the best current estimates and judgment of Molecular's and the Company's
management as to the future financial condition and results of operations of
Molecular and the Company, respectively. We have visited but have not conducted
a physical inspection of the properties and facilities of the Company and
Molecular, nor have we made or obtained any independent evaluation or appraisal
of such properties and facilities. We have also taken into account our
assessment of general economic, market and financial conditions and our
experience in similar transactions, as well as our experience in securities
valuation in general. Our opinion necessarily is based upon economic, market,
financial and other conditions as they exist and can be evaluated on the date
hereof, and we assume no responsibility to update or revise our opinion based
upon events or circumstances occurring after the date hereof. We reserve,
however, the right to withdraw, revise or modify our opinion based upon
additional information which may be provided to or obtained by us, which
suggests, in our judgment, a material change in the assumptions upon which our
opinion is based.

     This letter and the opinion expressed herein are for the use of the Board
of Directors of Molecular. This opinion does not address Molecular's underlying
business decision to approve the Proposed Transaction or constitute a
recommendation to the stockholders of Molecular as to how such stockholders
should vote or as to any other action such stockholders should take regarding
the Proposed Transaction. This opinion may not be reproduced, summarized,
excerpted from or otherwise publicly referred to or disclosed in any manner
without our prior written consent except Molecular may include this opinion in
its entirety in any proxy statement or information statement relating to the
Proposed Transaction sent to Molecular's and the Company's stockholders.

     Based upon and subject to the foregoing, it is our opinion as investment
bankers that the Exchange Ratio offered in the Proposed Transaction is fair,
from a financial point of view, to the stockholders of Molecular.

                                          Very truly yours,

                                          /s/ ING Barings LLC
                                          ING BARINGS LLC

                                       E-2
<PAGE>   194

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 145 of the Delaware General Corporation Law, Article VI of
Molecular Devices' Amended and Restated Certificate of Incorporation, Article XI
of Molecular Devices' bylaws, and indemnification agreements entered into by
Molecular Devices with its directors provide for the indemnification of
officers, directors, employees and agents under certain circumstances.

     Set forth below is Article VI of Molecular Devices' Restated Certificate of
Incorporation pertaining to indemnification of officers, directors, employees
and agents and insurance:

                                  "ARTICLE VI.

     A.  A director of the corporation shall not be personally liable to the
corporation or its stockholders for monetary damages for any breach of fiduciary
duty as a director, except for liability (i) for any breach of the director's
duty of loyalty to the corporation or its stockholders, (ii) for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, (iii) under Section 174 of the Delaware General Corporation
Law, or (iv) for any transaction from which the director derived an improper
personal benefit. If the Delaware General Corporation Law is amended after
approval by the stockholders of this Article to authorize corporate action
further eliminating or limiting the personal liability of directors, then the
liability of a director shall be eliminated or limited to the fullest extent
permitted by the Delaware General corporation Law, as so amended.

     B.  Any repeal or modification of this Article VI shall be prospective and
shall not affect the rights under this Article VI in effect at the time of the
alleged occurrence of any act or omission to act giving rise to liability or
indemnification."

     Set forth below is Article XI of Molecular Devices' bylaws, as amended:

                                  "ARTICLE XI

                                INDEMNIFICATION

SECTION 43.  INDEMNIFICATION OF DIRECTORS, EXECUTIVE OFFICERS, OTHER OFFICERS,
             EMPLOYEES AND OTHER AGENTS.

     (a)  Directors and Officers.  The corporation shall indemnify its directors
and officers to the fullest extent not prohibited by the Delaware General
Corporation Law; provided, however, that the corporation may modify the extent
of such indemnification by individual contracts with its directors and executive
officers and, provided, further, that the corporation shall not be required to
indemnify any director or officer in connection with any proceeding (or part
thereof) initiated by such person unless (i) such indemnification is expressly
required to be made by law, (ii) the proceeding was authorized by the Board of
Directors of the corporation, (iii) such indemnification is provided by the
corporation, in its sole discretion, pursuant to the powers vested in the
corporation under the Delaware General Corporation Law or (iv) such
indemnification is required to be made under subsection (d).

     (b)  Employees and Other Agents.  The corporation shall have power to
indemnify its employees and other agents as set forth in the Delaware General
Corporation Law.

     (c)  Expenses.  The corporation shall advance to any person who was or is a
party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, by reason of the fact that he is or was a director or officer, of
the corporation, or is or was serving at the request of the corporation as a
director or officer of another corporation, partnership, joint venture, trust or
other enterprise, prior to the final disposition of the
                                      II-1
<PAGE>   195

proceeding, promptly following request therefor, all expenses incurred by any
director or officer in connection with such proceeding upon receipt of an
undertaking by or on behalf of such person to repay said amounts if it should be
determined ultimately that such person is not entitled to be indemnified under
this Bylaw or otherwise.

Notwithstanding the foregoing, unless otherwise determined pursuant to paragraph
(e) of this Bylaw, no advance shall be made by the corporation to an officer of
the corporation (except by reason of the fact that such officer is or was a
director of the corporation in which event this paragraph shall not apply) in
any action, suit or proceeding, whether civil, criminal, administrative or
investigative, if a determination is reasonably and promptly made (i) by the
Board of Directors by a majority vote of a quorum consisting of directors who
were not parties to the proceeding, or (ii) if such quorum is not obtainable,
or, even if obtainable, a quorum of disinterested directors so directs, by
independent legal counsel in a written opinion, that the facts known to the
decision-making party at the time such determination is made demonstrate clearly
and convincingly that such person acted in bad faith or in a manner that such
person did not believe to be in or not opposed to the best interests of the
corporation.

     (d)  Enforcement.  Without the necessity of entering into an express
contract, all rights to indemnification and advances to directors and officers
under this Bylaw shall be deemed to be contractual rights and be effective to
the same extent and as if provided for in a contract between the corporation and
the director or officer. Any right to indemnification or advances granted by
this Bylaw to a director or officer shall be enforceable by or on behalf of the
person holding such right in any court of competent jurisdiction if (i) the
claim for indemnification or advances is denied, in whole or in part, or (ii) no
disposition of such claim is made within ninety (90) days of request therefor.
The claimant in such enforcement action, if successful in whole or in part,
shall be entitled to be paid also the expense of prosecuting his claim. In
connection with any claim for indemnification, the corporation shall be entitled
to raise as a defense to any such action that the claimant has not met the
standards of conduct that make it permissible under the Delaware General
Corporation Law for the corporation to indemnify the claimant for the amount
claimed. In connection with any claim by an officer of the corporation (except
in any action, suit or proceeding, whether civil, criminal, administrative or
investigative, by reason of the fact that such officer is or was a director of
the corporation) for advances, the corporation shall be entitled to raise a
defense as to any such action clear and convincing evidence that such person
acted in bad faith or in a manner that such person did not believe to be in or
not opposed to the best interests of the corporation, or with respect to any
criminal action or proceeding that such person acted without reasonable cause to
believe that his conduct was lawful. Neither the failure of the corporation
(including its Board of Directors, independent legal counsel or its
stockholders) to have made a determination prior to the commencement of such
action that indemnification of the claimant is proper in the circumstances
because he has met the applicable standard of conduct set forth in the Delaware
General Corporation Law, nor an actual determination by the corporation
(including its Board of Directors, independent legal counsel or its
stockholders) that the claimant has not met such applicable standard of conduct,
shall be a defense to the action or create a presumption that claimant has not
met the applicable standard of conduct.

     (e)  Non-Exclusivity of rights.  The rights conferred on any person by this
Bylaw shall not be exclusive of any other right which such person may have or
hereafter acquire under any statute, provision of the Certificate of
Incorporation, Bylaws, agreement, vote of stockholders or disinterested
directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding office. The corporation is specifically
authorized to enter into individual contracts with any or all of its directors,
officers, employees or agents respecting indemnification and advances, to the
fullest extent not prohibited by the Delaware General Corporation Law.

     (f)  Survival of Rights.  The rights conferred on any person by this Bylaw
shall continue as to a person who has ceased to be a director, officer, employee
or other agent and shall inure to the benefit of the heirs, executors and
administrators of such a person.

                                      II-2
<PAGE>   196

     (g)  Insurance.  To the fullest extent permitted by the Delaware General
Corporation Law, the corporation, upon approval by the Board of Directors, may
purchase insurance on behalf of any person required or permitted to be
indemnified pursuant to this Bylaw.

     (h)  Amendment.  Any repeal or modification of this Bylaw shall only be
prospective and shall not affect the rights under this Bylaw in effect at the
time of the alleged occurrence of any action or omission to act that is the
cause of any proceeding against any agent of the corporation.

     (i)  Savings Clause.  If this Bylaw or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
corporation shall nevertheless indemnify each director and officer to the full
extent not prohibited by any applicable portion of this Bylaw that shall not
have been invalidated, or by any other applicable law.

     (j)  Certain Definitions.  For the purposes of this Bylaw, the following
definitions shall apply:

          (i)  The term "proceeding" shall be broadly construed and shall
     include, without limitation, the investigation, preparation, prosecution,
     defense, settlement, arbitration and appeal of, and the giving of testimony
     in, any threatened, pending or completed action, suit or proceeding,
     whether civil, criminal, administrative or investigative.

          (ii)  The term "expenses" shall be broadly construed and shall
     include, without limitation, court costs, attorneys' fees, witness fees,
     fines, amounts paid in settlement or judgment and any other costs and
     expenses of any nature or kind incurred in connection with any proceeding.

          (iii)  The term the "corporation" shall include, in addition to the
     resulting corporation, any constituent corporation (including any
     constituent of a constituent) absorbed in a consolidation or merger which,
     if its separate existence had continued, would have had power and authority
     to indemnify its directors, officers, and employees or agents, so that any
     person who is or was a director, officer, employee or agent of such
     constituent corporation, or is or was serving at the request of such
     constituent corporation as a director, officer, employee or agent of
     another corporation, partnership, joint venture, trust or other enterprise,
     shall stand in the same position under the provisions of this Bylaw with
     respect to the resulting or surviving corporation as he would have with
     respect to such constituent corporation if its separate existence had
     continued.

          (iv)  References to a "director," "executive officer," "officer,"
     "employee," or "agent" of the corporation shall include, without
     limitation, situations where such person is serving at the request of the
     corporation as, respectively, a director, executive officer, officer,
     employee, trustee or agent of another corporation, partnership, joint
     venture, trust or other enterprise.

          (v)  References to "other enterprises" shall include employee benefit
     plans; references to "fines" shall include any excise taxes assessed on a
     person with respect to an employee benefit plan; and references to "serving
     at the request of the corporation" shall include any service as a director,
     officer, employee or agent of the corporation which imposes duties on, or
     involves services by, such director, officer, employee, or agent with
     respect to an employee benefit plan, its participants, or beneficiaries;
     and a person who acted in good faith and in a manner be reasonably believed
     to be in the interest of the participants and beneficiaries of an employee
     benefit plan shall be deemed to have acted in a manner "not opposed to the
     best interests of the corporation" as referred to in this Bylaw."

     In addition, Molecular Devices has entered into indemnification agreements
with its directors and officers, pursuant to which Molecular Devices has agreed
to indemnify such directors and officers in accordance with, and to the fullest
extent permitted by, the Delaware General Corporation Law, against any and all
expenses, judgments, fines and amounts paid in settlement actually and
reasonably incurred by the indemnitee in connection with any proceeding in which
the indemnitee was or is made a party or was or is involved by reason of the
fact that the indemnitee is or was a director or an officer.

     Molecular Devices has also purchased liability insurance policies covering
certain directors and officers of Molecular Devices.

                                      II-3
<PAGE>   197

ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                            DESCRIPTION
-------                           -----------
<S>       <C>
2.1       Agreement and Plan of Merger and Reorganization dated as of
          June 7, 2000, among Molecular Devices Corporation, Mercury
          Acquisition Sub, Inc. and LJL BioSystems, Inc. (included as
          Annex A to the joint proxy statement/prospectus).
2.2       Form of Parent Voting Agreement between LJL BioSystems, Inc.
          and certain stockholders of Molecular Devices Corporation
          (included as Annex B to the joint proxy
          statement/prospectus).
2.3       Form of Company Voting Agreement between Molecular Devices
          Corporation and certain stockholders of LJL BioSystems, Inc.
          (included as Annex C to the joint proxy
          statement/prospectus).
3.1**     Amended and Restated Certificate of Incorporation of
          Molecular Devices Corporation (incorporated by reference to
          the similarly described exhibit in Molecular Devices'
          Registration Statement on Form S-1 (File No. 33-98926), as
          amended).
3.2**     Molecular Devices Corporation By-Laws (incorporated by
          reference to the similarly described exhibit in Molecular
          Devices' Registration Statement on Form S-1 (File No.
          33-98926), as amended).
5.1       Opinion of Cooley Godward LLP regarding the legality of the
          securities.
8.1       Opinion of Cooley Godward LLP regarding tax matters.
8.2       Opinion of Venture Law Group, A Professional Corporation,
          regarding tax matters.
23.1      Consent of Cooley Godward LLP (set forth in Exhibit 5.1).
23.2      Consent of Cooley Godward LLP (set forth in Exhibit 8.1).
23.3      Consent of Venture Law Group, A Professional Corporation
          (set forth in Exhibit 8.2).
23.4      Consent of Ernst & Young LLP.
23.5      Consent of PricewaterhouseCoopers LLP.
23.6      Consent of ING Barings LLC.
23.7      Consent of Gleacher & Co. LLC.
24.1*     Powers of Attorney (set forth on signature page).
99.1      Form of Molecular Devices Proxy.
99.2      Form of LJL BioSystems Proxy.
99.3      Consent of Prospective Director.
</TABLE>


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

*  Previously filed.


** Incorporated by reference.

FINANCIAL STATEMENT SCHEDULES:

     The Financial Statement Schedules have previously been filed as part of
Molecular Devices' Form 10-K for the fiscal year ended December 31, 1999.

                                      II-4
<PAGE>   198

ITEM 22.  UNDERTAKINGS.

     The undersigned Registrant hereby undertakes:

     (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:

          (i) To include any prospectus required in Section 10(a)(3) of the
     Securities Act of 1933;

          (ii) To reflect in the prospectus any facts or events arising after
     the effective date of the Registration Statement (or the most recent
     post-effective amendment thereof) which, individually or in the aggregate,
     represent a fundamental change in the information set forth in the
     Registration Statement;

          (iii) To include any material information with respect to the plan of
     distribution not previously disclosed in the Registration Statement or any
     material change to such information in the Registration Statement;

provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed by the Registrant pursuant to
section 13 or section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the Registration Statement;

     (2) That, for the purpose of determining any liability under the Securities
Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof;

     (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering;

     (4) That, for purposes of determining any liability under the Securities
Act of 1933, each filing of the Registrant's annual report pursuant to section
13(a) or section 15(d) of the Securities Exchange Act of 1934 that is
incorporated by reference in the Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof;

     (5) To respond to requests for information that is incorporated by
reference into the prospectus pursuant to Items 4, 10(b), 11 or 13 of this Form,
within one business day of receipt of such request, and to send the incorporated
documents by first class mail or other equally prompt means. This includes
information contained in documents filed subsequent to the effective date of the
Registration Statement through the date of responding to the request;

     (6) That, prior to any public reoffering of the securities registered
hereunder through use of a prospectus which is a part of this Registration
Statement, by any person or party who is deemed to be an underwriter within the
meaning of Rule 145(c), the issuer undertakes that such reoffering prospectus
will contain the information called for by the applicable registration form with
respect to reofferings by persons who may be deemed underwriters, in addition to
the information called for by the other Items of the applicable form;

     (7) That every prospectus (i) that is filed pursuant to paragraph (6)
immediately preceding, or (ii) that purports to meet the requirements of section
10(a)(3) of the Securities Act and is used in connection with an offering of
securities subject to Rule 415, will be filed as a part of an amendment to the
registration statement and will not be used until such amendment is effective,
and that, for purposes of determining any liability under the Securities Act,
each such post-effective amendment shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof; and

                                      II-5
<PAGE>   199

     (8) To supply by means of a post-effective amendment all information
concerning a transaction, and the company being acquired involved therein, that
was not the subject of and included in the Registration Statement when it became
effective.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions described under Item 20 above, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                      II-6
<PAGE>   200

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant has duly caused this Registration Statement on Form S-4 to be signed
on its behalf by the undersigned, thereunto duly authorized, in Sunnyvale,
California, on the 14th day of July 2000.


                                          MOLECULAR DEVICES CORPORATION

                                          By:  /s/ JOSEPH D. KEEGAN, PH.D
                                            ------------------------------------
                                                   Joseph D. Keegan, Ph.D
                                               President and Chief Executive
                                                            Officer


     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on the dates indicated.



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

            /s/ JOSEPH D. KEEGAN, PH.D               President, Chief Executive Officer and July 14, 2000
---------------------------------------------------    Director (Principal Executive
              Joseph D. Keegan, Ph.D                   Officer)

                         *                           Vice President, Finance and Chief      July 14, 2000
---------------------------------------------------    Financial Officer (Principal
                Timothy A. Harkness                    Financial and Accounting Officer)

                         *                           Director                               July 14, 2000
---------------------------------------------------
                  Moshe H. Alafi

                         *                           Director                               July 14, 2000
---------------------------------------------------
                 David L. Anderson

                         *                           Director                               July 14, 2000
---------------------------------------------------
                 A. Blaine Bowman

                         *                           Director                               July 14, 2000
---------------------------------------------------
                Paul Goddard, Ph.D

                                                     Director                               July   , 2000
---------------------------------------------------
                  Andre F. Marion

                         *                           Director                               July 14, 2000
---------------------------------------------------
             Harden M. McConnell, Ph.D

                         *                           Director                               July 14, 2000
---------------------------------------------------
               J. Allan Waitz, Ph.D

          By: /s/ JOSEPH D. KEEGAN, PH.D
  ----------------------------------------------
              Joseph D. Keegan, Ph.D
                 Attorney-in-fact
</TABLE>


                                      II-7
<PAGE>   201


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                            DESCRIPTION
-------                           -----------
<S>       <C>
2.1       Agreement and Plan of Merger and Reorganization dated as of
          June 7, 2000, among Molecular Devices Corporation, Mercury
          Acquisition Sub, Inc. and LJL BioSystems, Inc. (included as
          Annex A to the joint proxy statement/prospectus).
2.2       Form of Parent Voting Agreement between LJL BioSystems, Inc.
          and certain stockholders of Molecular Devices Corporation
          (included as Annex B to the joint proxy
          statement/prospectus).
2.3       Form of Company Voting Agreement between Molecular Devices
          Corporation and certain stockholders of LJL BioSystems, Inc.
          (included as Annex C to the joint proxy
          statement/prospectus).
3.1**     Amended and Restated Certificate of Incorporation of
          Molecular Devices Corporation (incorporated by reference to
          the similarly described exhibit in Molecular Devices'
          Registration Statement on Form S-1 (File No. 33-98926), as
          amended).
3.2**     Molecular Devices Corporation By-Laws (incorporated by
          reference to the similarly described exhibit in Molecular
          Devices' Registration Statement on Form S-1 (File No.
          33-98926), as amended).
5.1       Opinion of Cooley Godward LLP regarding the legality of the
          securities.
8.1       Opinion of Cooley Godward LLP regarding tax matters.
8.2       Opinion of Venture Law Group, A Professional Corporation,
          regarding tax matters.
23.1      Consent of Cooley Godward LLP (set forth in Exhibit 5.1).
23.2      Consent of Cooley Godward LLP (set forth in Exhibit 8.1).
23.3      Consent of Venture Law Group, A Professional Corporation,
          (set forth in Exhibit 8.2).
23.4      Consent of Ernst & Young LLP.
23.5      Consent of PricewaterhouseCoopers LLP.
23.6      Consent of ING Barings LLC.
23.7      Consent of Gleacher & Co. LLC.
24.1*     Powers of Attorney (set forth on signature page).
99.1      Form of Molecular Devices Proxy.
99.2      Form of LJL BioSystems Proxy.
99.3      Consent of Prospective Director.
</TABLE>


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

*  Previously filed.



** Incorporated by reference.



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