CELLOMICS INC
S-1/A, 2000-09-05
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1


       AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 1, 2000
                                                      REGISTRATION NO. 333-31680

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


                                AMENDMENT NO. 2


                                       TO

                                    FORM S-1
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                               ------------------

                                CELLOMICS, INC.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                               <C>                               <C>
            DELAWARE                            8731                           25-1763831
(State or other jurisdiction of     (Primary Standard Industrial            (I.R.S. Employer
 incorporation or organization)     Classification Code Number)           Identification No.)
</TABLE>

                              635 WILLIAM PITT WAY
                         PITTSBURGH, PENNSYLVANIA 15238
                                 (412) 826-3600
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

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

                            D. LANSING TAYLOR, PH.D.
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              635 WILLIAM PITT WAY
                         PITTSBURGH, PENNSYLVANIA 15238
                                 (412) 826-3600
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                   COPIES TO:

<TABLE>
<S>                                                  <C>
                 WILLIAM R. NEWLIN                                    RODD M. SCHREIBER
                LEWIS U. DAVIS, JR.                    SKADDEN, ARPS, SLATE, MEAGHER & FLOM (ILLINOIS)
                 RONALD W. SCHULER                                  333 WEST WACKER DRIVE
    BUCHANAN INGERSOLL PROFESSIONAL CORPORATION                          SUITE 2100
                 ONE OXFORD CENTRE                                 CHICAGO, ILLINOIS 60606
                 301 GRANT STREET
          PITTSBURGH, PENNSYLVANIA 15219
</TABLE>

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: AS SOON AS
PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, 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 effective
registration statement for the same offering.  [ ]

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

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]

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


    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

        THE INFORMATION IN THIS PRELIMINARY PROSPECTUS IS NOT COMPLETE AND MAY
        BE CHANGED. CELLOMICS MAY NOT SELL THESE SECURITIES UNTIL THE
        REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
        IS EFFECTIVE. THIS 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.


                   SUBJECT TO COMPLETION -- SEPTEMBER 1, 2000


PROSPECTUS
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                                6,000,000 Shares


                                 CELLOMICS LOGO
                                  Common Stock

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


Cellomics, Inc. is offering 6,000,000 shares of its common stock in an initial
public offering. Prior to this offering, there has been no public market for our
common stock.


Cellomics is developing and commercializing products in the emerging field of
cellomics in an effort to extend the recent advances in genomics, the study of
genes, and proteomics, the study of proteins.


It is anticipated that the public offering price will be between $16.00 and
$18.00 per share. Application has been made to include the shares for quotation
in the Nasdaq National Market under the symbol "CLMX".


<TABLE>
<CAPTION>
                                                           Per Share        Total
        <S>                                                <C>           <C>
        Public offering price............................  $             $
        Underwriting discounts and commissions...........  $             $
        Proceeds, before expenses, to Cellomics..........  $             $
</TABLE>


SEE "RISK FACTORS" ON PAGES 7 TO 15 FOR FACTORS THAT SHOULD BE CONSIDERED BEFORE
INVESTING IN THE SHARES OF CELLOMICS.

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

Neither the Securities and Exchange Commission nor any state securities
commission has
approved or disapproved of these securities or passed upon the accuracy or
adequacy of this
prospectus. Any representation to the contrary is a criminal offense.

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


The underwriters may, under certain circumstances, purchase up to 900,000
additional shares from Cellomics at the public offering price, less underwriting
discounts and commissions. Delivery and payment for the shares will be on
            , 2000.



PRUDENTIAL VECTOR HEALTHCARE                                         ING BARINGS

       A UNIT OF PRUDENTIAL SECURITIES

            , 2000
<PAGE>   3

[Diagrams depicting our complete solution in applying cellomics products and
technologies to the life sciences markets, including products that generate
data, extract information and create cellular knowledge.]
<PAGE>   4

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                     PAGE
                                     ----
<S>                                  <C>
Prospectus Summary.................    3
Risk Factors.......................    7
Forward-Looking Statements.........   16
Use of Proceeds....................   17
Dividend Policy....................   17
Capitalization.....................   18
Dilution...........................   19
Selected Financial Data............   20
Management's Discussion and
  Analysis of Financial Condition
  and Results of Operations........   22
Business...........................   28
Management.........................   43
Certain Transactions...............   52
Principal Stockholders.............   55
Description of Capital Stock.......   58
Shares Eligible for Future Sale....   62
Underwriting.......................   64
Legal Matters......................   65
Experts............................   66
Where You Can Find More
  Information......................   66
Index to Financial Statements......  F-1
</TABLE>


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


     ArrayScan(R) and Cellomics(R) are our registered trademarks. We have
applied for registration of the following trademarks: the Cellomics logo,
CellChip, HitKit, and PharmacoCellomics. This prospectus also includes
trademarks and tradenames of other companies.

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

     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with different information. We are not
making an offer of these securities in any jurisdiction where the offer or sale
is not permitted. You should not assume that the information contained in this
prospectus is accurate as of any date other than the date on the front cover of
this prospectus.

                                        2
<PAGE>   5

                               PROSPECTUS SUMMARY

     This summary highlights information contained elsewhere in this prospectus.
This summary does not contain all the information that you should consider
before investing in our common stock. You should read the entire prospectus
carefully.

                                  OUR COMPANY


     We are a pioneer in the emerging field of cellomics. We believe the field
of cellomics will extend the recent advances in genomics, the study of genes,
and proteomics, the study of proteins. Cellomics refers to the study of all the
molecules comprising a cell, as well as their interactions in space and over
time, that bring about cellular functions. Normal genes and proteins coordinate
and perform life functions and abnormal genes and proteins cause disease at the
cellular level. We offer products that we design to provide in-depth knowledge
about cells and cellular functions in order to aid researchers in drug
discovery, basic biomedical research and clinical diagnostics. We design our
products to:


     - measure the physical position and activity over time of cells and
       cellular components;


     - extract information about cells, cellular components and their functions;



     - create new knowledge about cells; and



     - enable researchers to access a digital "virtual cell."



     We developed our initial products starting in 1997 through early technology
access programs with Johnson & Johnson, Merck & Co., Inc. and Warner-Lambert
Company. We currently market four products and have a number of products in
various stages of development. We currently develop a number of our products in
collaboration with third parties, including Carl Zeiss Jena GmbH, one of the
world's leading optical engineering and manufacturing companies, as well as
ACLARA Biosciences, Inc. and Molecular Probes, Inc.



                                  OUR PRODUCTS


     Our products and products in development include:


     - High Content Screening Products. We refer to information about time,
       space and activity of cells and cellular components as high content
       cellular information. We design our high content screening products to
       provide this information to researchers. We introduced our first
       automated system, the ArrayScan II, in late 1999, and have additional
       automated systems in development. Our customers can expand the
       capabilities of our automated systems through follow-on purchases of our
       software tools and tests for specific cellular reactions. We are also
       developing a miniaturized screening system, called the CellChip System.
       We believe the CellChip System will permit researchers to perform cell
       experiments more quickly and at lower cost.



     - Informatics Products. We refer to software programs that archive, manage
       and extract large quantities of information about cells, cellular
       components and their functions as informatics products. We began
       commercialization of our first informatics product, Cellomics Store, in
       1999. We design our informatics products to provide our customers with a
       user-friendly, web-based environment built on top of industry standard
       database tools, together with data and pattern analysis tools for easy
       data exchange.



     - Cellular Bioinformatics Products. We refer to searchable databases of
       cellular information and related software as cellular bioinformatics
       products. We design these products to enable researchers to perform
       computer-based searches of cellular information to identify new knowledge
       about cells and cellular functions. We believe our database under
       development has the potential to personalize drug discovery based on the
       response of an individual's cells to drugs in much the same way that
       genomics databases have begun to personalize drug discovery based on the
       genetic make-up of individual patients.


     We believe our products can enhance the productivity of the drug discovery
process by offering insights into the cellular properties of drug candidates
prior to initiating pre-clinical and human clinical trials. We believe that, in
this way, our products may allow researchers to more accurately identify and
select those candidates that have a higher chance of successfully completing the
drug development process. In addition to our products, we market Zeiss' Ultra
High Throughput Screening System in North America on an exclusive basis.

                                        3
<PAGE>   6

                           OUR INITIAL TARGET MARKETS


     We initially target our products to pharmaceutical and biotechnology
companies and academic and government laboratories engaged in drug discovery.
According to industry sources, the pharmaceutical industry spent approximately
$24 billion on research and development in 1999. Industry sources estimate that
only 20% of new drug candidates ever become marketed drugs, and only about 30%
of drugs ever recoup their development costs. We believe that researchers must
understand how cells work in order to develop effective drugs or therapies.
Present drug discovery techniques, however, do not provide information about the
physical position and activity over time of cells and cellular components. The
current drug discovery process therefore makes assumptions about the
specificity, effectiveness and toxicity of potential drug candidates. These
assumptions must then be validated through expensive and time consuming
pre-clinical and human clinical trials. In addition, advances in some aspects of
the drug discovery process, such as genomics, proteomics and high throughput
screening, have led to a proliferation in the number of potential drug
candidates and a corresponding bottleneck in selecting candidates for further
development. We estimate that the drug discovery market for our products
includes approximately 140 pharmaceutical companies, 2,000 biotechnology
companies and over 1,000 academic and government laboratories.


                                  OUR STRATEGY


     We aim to be a leader in the field of cellomics. Key elements of our
strategy include:



     - establishing high content screening as the standard for drug discovery;



     - offering a broad menu of software tools and tests for specific cellular
       reactions to generate recurring revenues;



     - expanding into additional segments of the life sciences market, including
       basic biomedical research, clinical diagnostics and agriculture;



     - migrating our high content screening system to the miniaturized CellChip
       System;



     - constructing a powerful predictive tool by creating a searchable
       repository of cellular information and by linking this information to
       existing genomics and proteomics databases; and



     - combining our strengths with the strengths of strategic corporate
       partners to access complementary technologies and strengthen our
       commercialization capabilities.



                              RECENT DEVELOPMENTS



     In July 2000, we entered into a comprehensive 10-year strategic
relationship with Beckman Coulter, Inc. including a global distribution
agreement for some of our high content screening and infomatics products. In
addition, Beckman Coulter purchased $4.8 million of our common stock.


                                    ABOUT US


     We were originally incorporated in Pennsylvania in 1995, and reincorporated
in Delaware in 1998. Our revenues from operations totaled approximately $10.4
million since our inception, including $3.4 million in 1999 and $4.0 million for
the six months ended June 30, 2000. We incurred operating losses in each of the
years since our inception. As of June 30, 2000, our accumulated deficit was
approximately $25.9 million.



     Our principal offices and manufacturing facilities are at 635 William Pitt
Way, Pittsburgh, Pennsylvania 15238 and our telephone number is (412) 826-3600.


'


                                        4
<PAGE>   7

                                  THE OFFERING


Shares offered by Cellomics.........      6,000,000 shares



Total shares outstanding after this
offering............................     20,124,002 shares


Use of proceeds.....................     For technology research and product and
                                         services development, scale-up of sales
                                         and marketing, capital expenditures,
                                         working capital and general corporate
                                         purposes.

Proposed Nasdaq National Market
symbol..............................     CLMX


     We based the number of shares of common stock to be outstanding after this
offering on the number of shares outstanding on June 30, 2000 plus the 541,300
shares of common stock sold to Beckman Coulter on July 3, 2000. This number
includes 9,396,155 shares of common stock issuable upon the conversion of all of
our outstanding shares of convertible preferred stock but excludes:



    - 2,623,923 shares of common stock reserved for issuance under our stock
      option plans, of which options for 1,741,477 shares are outstanding as of
      August 31, 2000, at a weighted average exercise price of $0.49;



    - 1,575,166 shares of common stock issuable upon exercise of outstanding
      warrants as of August 31, 2000, at a weighted average exercise price of
      $2.18; and



    - up to 900,000 shares that the underwriters may purchase if they exercise
      their over-allotment option in full.


     Unless otherwise indicated, information in this prospectus assumes the
following:

     - the conversion of all of our outstanding shares of convertible preferred
       stock into shares of common stock upon the closing of this offering;


     - completion of a 3.532-for-1 stock split immediately prior to the
       offering, with all references to preferred stock outstanding prior to the
       conversion to common stock reflecting the stock split; and


     - the filing of our amended and restated certificate of incorporation.

                                  RISK FACTORS

     You should consider the risk factors and the impact of various events that
could adversely affect our business before investing in our common stock.

                                        5
<PAGE>   8

                             SUMMARY FINANCIAL DATA


     We derived the following summary statement of operations data for the years
ended December 31, 1997, 1998 and 1999 from our audited financial statements.



     We derived the statement of operations data for the six months ended June
30, 1999 and 2000 from our unaudited interim financial statements.



     The pro forma net loss per share presented below for the year ended
December 31, 1999 and the six months ended June 30, 2000 assumes conversion of
the Series A and Series B preferred stock outstanding at the end of each period
into common stock on a one-for-one basis at the beginning of each period, or the
date of issuance if later. The Series A and Series B preferred stock will
automatically convert into common stock upon the closing of this offering.



     The pro forma balance sheet data presented below give effect to:



     - the sale of 541,300 shares of our common stock on July 3, 2000 for
       aggregate proceeds to Cellomics of $4.8 million, and



     - the conversion of our Series A and Series B preferred stock into common
       stock upon the closing of this offering as if such conversion had
       occurred at June 30, 2000.



     The pro forma as adjusted balance sheet data presented below give effect
to:



     - the sale of 6,000,000 shares of common stock at an assumed initial public
       offering price of $17.00 per share, after deducting underwriting
       discounts and commissions and estimated offering expenses.


     You should read the summary financial data together with our financial
statements and the related notes and the sections of this prospectus entitled
"Capitalization" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations."


<TABLE>
<CAPTION>
                                                                                                     SIX MONTHS
                                                                                                   ENDED JUNE 30,
                                                            YEAR ENDED DECEMBER 31,             ---------------------
                                                       ----------------------------------            (UNAUDITED)
                                                        1997         1998          1999          1999          2000
                                                       -------      -------      --------       -------      --------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                    <C>          <C>          <C>            <C>          <C>
STATEMENT OF OPERATIONS DATA:
Revenues.............................................  $   395      $ 2,273      $  3,390       $ 1,115      $  3,987
Operating costs and expenses.........................    2,820        5,782        13,847         5,820        10,844
Loss from operations.................................   (2,425)      (3,509)      (10,457)       (4,705)       (6,857)
Net loss.............................................   (2,438)      (3,495)      (10,618)       (4,603)       (8,744)
Net loss attributable to common stockholders.........   (2,438)      (4,013)      (11,551)       (5,057)      (15,864)
Net loss per share--basic and diluted................  $ (0.61)     $ (0.99)     $  (2.77)      $ (1.21)     $  (3.79)
Shares used to compute basic and diluted net
  loss per share.....................................    3,986        4,070         4,175         4,168         4,183
Pro forma net loss per share.........................                            $  (0.97)                   $  (0.67)
                                                                                                             --------
Shares used to compute pro forma net loss per
  share..............................................                              10,990                      13,030
                                                                                                             ========
</TABLE>



<TABLE>
<CAPTION>
                                                                        JUNE 30, 2000
                                                              ----------------------------------
                                                                         (UNAUDITED)
                                                                                       PRO FORMA
                                                                                          AS
                                                               ACTUAL     PRO FORMA    ADJUSTED
                                                              --------    ---------    ---------
                                                                        (IN THOUSANDS)
<S>                                                           <C>         <C>          <C>
BALANCE SHEET DATA:
Cash and cash equivalents...................................  $    852     $ 5,652      $99,662
Working capital (deficit)...................................      (305)      4,495       98,105
Total assets................................................     8,041      12,841      106,451
Total long-term debt less current maturities................     1,623       1,623        1,623
Mandatorily redeemable convertible preferred stock..........    20,916          --           --
Total stockholders' equity (deficit)........................   (21,127)      2,712       96,322
</TABLE>





                                        6
<PAGE>   9

                                  RISK FACTORS

     You should carefully consider the following risk factors, in addition to
other information set forth in this prospectus, before purchasing shares of our
common stock. Each of these risk factors could adversely affect our business,
financial condition and operating results, as well as the value of an investment
in our common stock. This investment involves a high degree of risk.

     RISKS RELATED TO OUR BUSINESS


     AS AN EARLY STAGE COMPANY, WE FACE MANY RISKS INHERENT IN OPERATING A NEW
     BUSINESS. IF WE DO NOT OVERCOME THESE RISKS, WE MAY NOT SUCCEED OR BECOME
     PROFITABLE.



     The risks inherent in operating a new business such as ours include:


     - difficulties and delays often encountered in developing, producing and
       commercializing new, complex technologies;

     - developing the markets for our high content screening, informatics and
       cellular bioinformatics products and technologies;

     - transitioning our research and development efforts to commercializing
       technologies; and

     - attracting and retaining qualified management, sales, technical and
       scientific staff.


     We cannot assure you that we will be able to address these risks
effectively. Therefore, uncertainty exists about the extent of our future losses
and the time required to achieve and maintain profitability. Further, we cannot
assure you that we will ever be able to generate sufficient revenue to achieve
or maintain profitability.



     WE HAVE A LIMITED OPERATING HISTORY AND HAVE INCURRED SIGNIFICANT LOSSES TO
     DATE. WE EXPECT TO CONTINUE TO INCUR LOSSES IN THE FORESEEABLE FUTURE AND
     WE MAY NEVER ACHIEVE OR MAINTAIN PROFITABILITY.



     We incurred operating losses in each of the years since our inception. As
of June 30, 2000, our accumulated deficit (unaudited) was approximately $25.9
million. Our losses primarily result from research and development and selling,
general and administrative expenses associated with our operations. Since our
inception, we generated limited revenue from the sale of our products,
technology and services. We financed our operations principally from private
placements of our common and preferred stock, collaboration agreements and
grants. We expect to continue to experience significant operating losses in the
foreseeable future as we continue to expand our research and development efforts
and our marketing and sales force in an effort to commercialize more of our
products. We expect to incur additional losses until such time, if ever, that
our revenues from the sale of our products, technologies and services cover our
expenses. Achieving and maintaining long-term profitability depends on
successfully commercializing our products and technologies. We cannot assure you
that we will be able to achieve any of the foregoing or that we will be
profitable even if we successfully commercialize our products.



     WE USE SIGNIFICANTLY MORE CASH THAN WE GENERATE. IF WE FAIL TO OBTAIN
     SUFFICIENT CAPITAL, THEN OUR BUSINESS WOULD BE SIGNIFICANTLY HARMED.



     Since our inception, our operating and research and development activities
consumed more cash than we generated. Our current and anticipated development
projects require substantial additional cash. We expect that the net proceeds
from this offering, together with our existing assets and revenues from
operations, will be sufficient to fund our operations through 2001. However, we
may need to raise additional capital in the future to meet our operating and
research and development cash requirements. We lack committed external sources
of funding and cannot assure you that we will be able to obtain additional funds
on acceptable terms, if at all. The unavailability of adequate funds may require
us to:


                                        7
<PAGE>   10

     - delay, reduce the scope of, or eliminate the development or
       commercialization of one or more of our products;

     - obtain funds through arrangements with collaboration partners or others
       that may require us to relinquish rights to technologies or products that
       we would otherwise seek to develop or commercialize ourselves;

     - license rights to technologies or products on terms that are less
       favorable to us than might otherwise be available;

     - raise funds by issuing additional stock, which could have rights superior
       to existing stockholders or otherwise dilute our stockholders' interest.


     IF WE FAIL TO SUCCESSFULLY DEVELOP OR COMMERCIALIZE OUR TECHNOLOGIES OR TO
     GAIN ACCESS TO TECHNOLOGIES OF THIRD PARTIES, OR IF OUR PRODUCTS DO NOT
     BECOME WIDELY ACCEPTED METHODS IN DRUG DISCOVERY, WE MAY NOT GENERATE
     SUFFICIENT REVENUES OR ACHIEVE PROFITABILITY.



     We may encounter problems in commercially developing our technologies and
products. The complex process of commercializing our high content screening,
informatics and cellular bioinformatics products and technologies requires in
some cases the combination of instrumentation, cellular analysis products,
software and databases and our continued access to technologies of third
parties.



     We have limited experience with commercializing and marketing products. We
intend to rely on existing and future collaboration partners for developing,
commercializing and marketing our products. We cannot assure you that we, even
with the assistance of our collaboration partners, can successfully develop our
products and technologies to perform at the quality and capacity levels required
for commercial success. Unforeseen complications could cause product development
delays and increased development costs. We also expect in the future to derive a
substantial portion of our revenues from the sale and licensing of consumables,
such as reagents, which are substances used to detect and measure cellular
structure and activities, and cellular analysis kits. We intend to continue to
license cellular analysis technologies from third parties and to use these
licenses to develop reagents and cellular analysis kits internally. We cannot
guarantee that we will succeed in licensing any additional cellular analysis
technologies on acceptable terms, if at all, or that we will successfully
commercialize any reagents that we license or develop.



     Our reliance on collaboration partners and outside vendors, including a
sole or a limited group of suppliers in particular, also creates several risks,
including:



     - disputes may arise, leading to delays in or termination of the research,
       development or commercialization of our products or resulting in
       significant litigation or arbitration;


     - our partners could independently develop, or develop with third parties,
       products or technologies that compete with our products;

     - our partners may not pursue or commit enough resources to successfully
       develop, commercialize or distribute our products or technologies; and


     - the terms of our contracts, including pricing with our partners, may not
       be favorable to us in the future.


If we are unable to enter into future collaboration agreements or maintain
existing collaborations, we would experience increased capital requirements,
encounter significant delays in commercializing our products and the
development, manufacture or sale of our products may be adversely affected.


     Our tools for high content screening, informatics and cellular
bioinformatics products and technologies target a new and undefined market.
Pharmaceutical and biotechnology companies and academic and government
laboratories currently use very little of these technologies. To date, our
technologies have never been utilized in the discovery of any compound that has
ultimately become a commercialized drug. Because our initial products have been
in operation for only a limited period of time, their ease of use and commercial


                                        8
<PAGE>   11


value have not been fully established. In addition, operators using these
systems may require substantial new technical skills and training. If our
customers do not accept our products and technologies because these systems fail
or are perceived as failing to generate the expected quantities and quality of
data, are too difficult or costly to use or are otherwise deficient, then market
acceptance of our products will suffer and we may not be able to generate
further sales or achieve or maintain profitability.



     IF OUR OPERATING RESULTS FLUCTUATE SIGNIFICANTLY, WE FAIL TO MEET FINANCIAL
     EXPECTATIONS OR THE FINANCIAL MARKETS EXPERIENCE GENERAL VOLATILITY, OUR
     STOCK PRICE MAY DECLINE SUBSTANTIALLY.


     Our operating results may fluctuate in the future. Some of the factors that
could cause our operating results to fluctuate include:

     - the length and unpredictability of our sales cycles;

     - the relatively high purchase price of many of our products;


     - changes in exchange rates between the U.S. dollar and the German Deutsche
       Mark we pay for some of the components of our systems and systems we
       resell; and


     - research and development spending budgets of pharmaceutical companies.

     - the timing, release and competitiveness of our or our competitors'
       products.


     If revenues decline in a period, whether due to a delay in recognizing
expected revenues or otherwise, our earnings, if any, will decline. In
particular, research and development and a majority of selling, general and
administrative expenses are fixed costs regardless of variations in revenues.
Due to fluctuations in our revenues and operating expenses, we believe that
period-to-period comparisons of our results of operations are not a good
indication of our future performance. If our operating results in some future
quarter or quarters are below the expectations of securities analysts or
investors, our stock price could fluctuate and substantially decline.



     In addition, historically, extreme price and volume fluctuations in the
stock markets have occurred based on, among other things, general economic
conditions. In particular, extreme fluctuations occurred in the market prices of
the securities of life sciences companies, often without regard to their
operating performance. These broad fluctuations may adversely affect the trading
price of our common stock, regardless of our actual operating performance.



     In the past, following periods of market volatility, security holders
instituted class action litigation. If the market value of our stock experiences
adverse fluctuations and if litigation results, we could incur substantial legal
costs and management's attention could be diverted, which could materially harm
our business or cause the market price of our stock to further decline.


     WE RELY HEAVILY ON ZEISS TO MANUFACTURE SOME OF OUR KEY PRODUCTS. IF EITHER
     WE OR ZEISS FAIL TO PERFORM UNDER OUR AGREEMENTS, OUR ABILITY TO GENERATE
     REVENUES WILL BE SIGNIFICANTLY IMPAIRED.


     In February 2000, we entered into a development, manufacturing and supply
agreement with Zeiss. That agreement obligates Zeiss to develop and manufacture
our ArrayScan Kinetics Workstation and ArrayScan Kinetics Reader until 2002. Our
ability to develop, manufacture and obtain a sufficient supply of these products
depends significantly on Zeiss' performance under this agreement. If Zeiss
experiences manufacturing or development difficulties, or does not otherwise
perform under this agreement, our ability to generate revenues from sales of our
ArrayScan Kinetics Workstation and ArrayScan Kinetics Reader will be
dramatically reduced.



     The Zeiss development, manufacturing and supply agreement terminates in
December 2005. However, in some instances, this agreement may be terminated
prior to 2005. Termination of this agreement would require us to find one or
more alternative developers, suppliers and manufacturers for these products or
experience increased capital requirements to undertake development and
manufacturing at our own expense. We cannot


                                        9
<PAGE>   12


assure you that we would be able to find an alternative source to develop or
manufacture our products on a timely basis or on terms acceptable to us, if at
all. We also cannot assure you that we would be able to develop or manufacture
these instruments on our own. Additionally, upon termination of this agreement,
Zeiss could begin to develop its own competing technologies or seek other
collaborators that develop products that are competitive with our products.


     IF WE CANNOT SUCCESSFULLY COMMERCIALIZE ZEISS' ULTRA HIGH THROUGHPUT
     SCREENING SYSTEM IN NORTH AMERICA, THEN OUR NEAR-TERM REVENUES WILL BE
     MATERIALLY REDUCED.


     In February 2000, we also entered into a sales and marketing agreement with
Zeiss under which we agreed to sell and market Zeiss' Ultra High Throughput
Screening System and related products. Under the agreement, we exclusively
distribute these Zeiss products in North America. We expect to generate a
significant portion of our near-term revenues from these products. If either we
or Zeiss fail to perform under our agreement, or we cannot successfully
commercialize these products, our revenues and net income, if any, would be
significantly lower and business would be materially harmed. This agreement
terminates in December 2005. However, in some instances, this agreement may be
terminated prior to December 2005. Termination of this agreement would lower our
near-term and future revenues, and net income, if any.



     IF, AS A RESULT OF OUR LIMITED MANUFACTURING CAPABILITIES, WE ENCOUNTER
     MANUFACTURING PROBLEMS OR DELAYS, WE MAY HAVE LOWER REVENUES.



     Successful commercialization requires the manufacture of our products in
commercial quantities at an acceptable cost, either by us or by our
collaboration partners. To date, we have produced only a limited number of our
products and we have no experience in manufacturing commercial quantities of our
products. Our customers expect that we comply with standard manufacturing
practices. We manufacture in one facility located in Pittsburgh, Pennsylvania.
To achieve the production levels necessary for successful commercialization of
our products, we will need to scale-up our manufacturing facilities, establish
more automated manufacturing capabilities, maintain adequate levels of inventory
and rely on collaboration partners for components. In many cases, we obtain and
intend to obtain components, subassemblies, software and reagents used in our
products from single suppliers or a limited number of suppliers. For example, we
purchase optical components from Zeiss for our ArrayScan II and reagent supplies
from Molecular Probes that are used in our cellular analysis kits, the loss of
which would result in significant production delays and increased expenditures.
We cannot assure you that we can develop the necessary manufacturing capability
in compliance with manufacturing standards, or that we will be able to fund or
build an adequate commercial manufacturing facility to provide adequate
commercial supplies of quality products on a timely basis. If we cannot achieve
the required level and quality of production, we may need to outsource
production or rely on licensing and other arrangements with third parties who
possess sufficient manufacturing facilities and capabilities. Even if we could
outsource needed production or enter into licensing or other third party
arrangements, this could reduce our gross margins and expose us to the risks
inherent in relying on others. We also cannot assure you that our collaboration
partners will deliver an adequate supply of required components on a timely
basis. Failure to obtain these components on a timely basis would disrupt our
manufacturing and increase our costs. We cannot assure you that we, acting alone
or with the assistance of others, will successfully make the transition to
commercial production.



     IF WE ENCOUNTER DIFFICULTIES IN COMMERCIALIZING OUR PRODUCTS ON A MASS
     SCALE AS A RESULT OF OUR LIMITED SALES FORCE AND MARKETING EXPERIENCE OR
     BECKMAN COULTER'S FAILURE TO PERFORM, THEN OUR REVENUES AND PROFITABILITY
     WILL DECLINE.



     We have a limited sales force and limited experience in selling, marketing,
servicing and supporting our products. Successful penetration of our target
markets requires a larger sales force or distribution partner able to address
complex scientific and technical issues raised by our customers. We recently
entered into a distribution agreement with Beckman Coulter under which they will
distribute our ArrayScan II as well as our Cellomics Store informatics product.
Beckman Coulter will become our exclusive worldwide distributor

                                       10
<PAGE>   13


of these products and of our ArrayScan Kinetics Reader high content screening
product upon completion of the ArrayScan Kinetics Reader's development and our
certifying to Beckman Coulter that we can deliver it in commercial quantities.
Beckman Coulter also will market our test kits. If Beckman Coulter does not
perform under this agreement, our ability to generate revenues from sales of our
existing ArrayScan II and related software tools and test kits as well as from
our ArrayScan Kinetics Reader, Cellomics Store and Cellomics Screen (which is
under development) information products will be dramatically reduced. We also
need customer support personnel with a broad range of technical expertise to
adequately train our customers and service and support our products in the
field. If we fail to develop a larger sales force or customer support team or to
obtain a distribution partner with the necessary expertise, then our revenues
and profitability will decline.



     WE EXPECT THAT THE MARKET FOR CELL-BASED TOOLS AND TECHNOLOGIES WILL BE
     HIGHLY COMPETITIVE AND SUBJECT TO RAPID TECHNOLOGICAL CHANGES. IF WE FAIL
     TO SUCCESSFULLY COMPETE IN THIS MARKET, THEN WE WILL NOT BECOME PROFITABLE.



     The biotechnology industry and the market for tools and technologies for
drug discovery are highly competitive and subject to rapid technological
changes. We compete with companies in the United States and abroad that develop
and produce products to assist pharmaceutical companies and other researchers in
developing commercial drugs. Our competitors include biotechnology,
pharmaceutical, chemical and other companies, academic and scientific
institutions, government agencies and public and private research organizations.
We encounter competition from companies that offer one or more components of
high content screening, including integrated reagents, kits, applications,
instrumentation and informatics.



     Many of our competitors have much greater financial, technical, research,
marketing, sales, distribution, service and other resources than we do.
Moreover, our competitors may offer broader product lines and have greater name
recognition than we do. If our competitors develop or market more effective or
commercially attractive technologies or products than our current or future
products, our technologies and products would become obsolete.



     IF OUR INTELLECTUAL PROPERTY RIGHTS ARE NOT ADEQUATE, THEN THIRD PARTIES
     COULD USE OUR TECHNOLOGIES, AND SIGNIFICANTLY IMPAIR OUR ABILITY TO
     COMPETE.



     Our success depends in part on our ability to obtain patents, maintain
trade secret protection and operate our business without infringing the
proprietary rights of others. We depend, in part, on the patent rights licensed
from third parties with respect to our technologies. We cannot assure you that
patent applications filed by us or our licensors will result in patents being
issued, that the claims of such patents will offer significant protection for
our technology, or that any patents issued to or licensed by us, will not be
challenged, narrowed, invalidated or circumvented.



     Our patent positions and those of other biotechnology product companies are
uncertain and involve complex legal and factual questions. In addition, the
coverage sought to be claimed in a patent application can be significantly
reduced before issuance of the patent. Consequently, we cannot assure you that
our patent applications or those of our 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 ours or design around or otherwise
circumvent patents issued to us.


     We may be subject to legal proceedings that result in the revocation of
patent rights owned by or licensed to us, and as a result, competitors may
practice the patent or licensed technology. We are aware of third party patents
that contain issued claims that could be construed to cover certain aspects of
our technologies. We cannot assure you that we will not be required to license
any such patents to produce products or that such licenses would be available on
commercially reasonable terms, if at all. Any action against us claiming damages
and seeking to enjoin commercial activities relating to the affected
technologies could subject us to potential liability for damages. We could incur
substantial costs in defending patent infringement claims, obtaining patent
licenses, engaging in interference and opposition proceedings or other

                                       11
<PAGE>   14

challenges to our patent rights or intellectual property rights made by third
parties, or in bringing such proceedings or enforcing any of our patent rights.
Any of these proceedings would be expensive and time-consuming and divert
management's time and attention from other concerns.

     We also rely on trade secret and copyright law and employee and third party
nondisclosure agreements to protect our intellectual property rights in our
products and technology. We cannot assure you that these agreements and measures
will provide meaningful protection of our trade secrets, copyrights, know-how or
other proprietary information in the event of any unauthorized use,
misappropriation or disclosure, or that others will not independently develop
substantially equivalent proprietary technologies. Litigation to protect our
trade secrets or copyrights would result in significant costs to us as well as
diversion of management time. Adverse determinations in any such proceedings or
unauthorized disclosure of our trade secrets could have a material adverse
effect on our business, financial condition and operating results. In addition,
the laws of certain foreign countries do not protect our intellectual property
rights to the same extent as the laws of the United States. We cannot assure you
that we will be able to protect our intellectual property in these markets.

     The patent protection of biotechnology companies is highly uncertain,
involves complex legal and factual questions, and has been the subject of much
litigation. No consistent policy has emerged from the U.S. Patent and Trademark
Office or the courts regarding the breach of claims allowed or the degree of
protection offered under biotechnology patents. In addition, there is a
substantial backlog of biotechnology patent applications at the U.S. Patent and
Trademark Office and the approval or rejection of a patent application could
take several years.

     OUR SUCCESS WILL DEPEND PARTLY ON OUR ABILITY TO OPERATE WITHOUT INFRINGING
     ON OR UTILIZING THE PROPRIETARY RIGHTS OF OTHERS.

     We may be sued for infringing on the patent rights of others. Intellectual
property litigation is costly, and, even if we prevail, the cost of such
litigation could adversely affect our business, financial condition and
operating results. In addition, litigation is time consuming and could divert
management attention and resources away from our business. If we do not prevail
in any litigation, in addition to any damages we might have to pay, we could be
required to stop the infringing activity or obtain a license. Any required
license may not be available to us on acceptable terms, if at all. In addition,
some licenses may be non-exclusive, and therefore, our competitors may have
access to the same technology licensed to us. If we fail to obtain a required
license or are unable to design around a patent, we may be unable to sell some
of our products, which would reduce our revenues and net income, if any.

     IF WE DO NOT EFFECTIVELY MANAGE OUR RAPID GROWTH, OUR BUSINESS WOULD BE
     SIGNIFICANTLY HARMED.


     Since our inception in 1995, the number of our employees increased from six
to 122 employees as of August 31, 2000. In addition, we significantly increased
our development, manufacturing and operational facilities. In order to implement
our business strategy we expect continued rapid growth. Previous growth in our
business has strained, and expected future growth will significantly strain our
management, operational and financial resources. To manage such growth, we must
expand our facilities, augment our operational, financial and management systems
and hire and train additional qualified personnel. If we fail to manage growth
effectively, we may be unable to pursue new business opportunities or maintain
existing business relationships which would reduce our revenues and lower our
net income, if any, and our business would be significantly harmed.



     WE DEPEND ON OUR KEY PERSONNEL, THE LOSS OF WHOM WOULD ADVERSELY AFFECT OUR
     OPERATIONS. IF WE FAIL TO ATTRACT AND RETAIN THE TALENT REQUIRED FOR OUR
     BUSINESS, THEN OUR REVENUES AND PROFITABILITY, IF ANY, WILL BE REDUCED.



     We depend to a great extent on principal members of our management and
scientific staff, including Dr. D. Lansing Taylor, President and Chief Executive
Officer, the loss of whose services would impede

                                       12
<PAGE>   15


product introduction and achievement of our strategic objectives. Our success
depends on our ability to retain key employees and our scientific staff and our
continuing ability to attract and retain highly qualified scientific, technical
and managerial personnel. Intense competition exists for qualified staff and we
cannot assure you that we will be able to retain existing personnel or attract
and retain qualified staff in the future. We do not maintain, and do not
currently intend to obtain, key employee global life insurance on any of our
personnel other than on the life of Dr. Taylor. If we fail to hire and retain
personnel in key positions, we may be unable to develop or commercialize our
products in a timely manner which would reduce our revenue and harm our
profitability.


     IF WE INCUR PRODUCT LIABILITY CLAIMS, AND IF WE DO NOT HAVE ADEQUATE
     INSURANCE AGAINST THOSE CLAIMS, THEN OUR CASH RESERVES WILL BE REDUCED OR
     ELIMINATED.


     Our business exposes us to potential product liability claims that are
inherent in the life sciences field. Liability exists for any product we
develop, or any product made with the use of or incorporation of any of our
technologies, which causes injury or is found otherwise unsuitable during
manufacturing, marketing or sale. We cannot assure you that we will be able to
avoid product liability exposure. We have obtained product liability insurance
coverage in the amount of $6.0 million. However, we cannot assure you of the
present or future adequacy of our insurance coverage. We must pay any product
liability claim in excess of our insurance coverage, which would have a
detrimental effect on our financial condition. Also, we cannot assure you that
we can or will maintain our insurance policies on commercially acceptable terms,
if at all.



     IF THE GOVERNMENT REDUCES, WITHDRAWS OR TERMINATES OUR GRANTS, THEN OUR
     REVENUES WILL BE REDUCED.



     We received and expect to continue to receive funds from various U.S.
government research and technology development programs. The government may
significantly reduce funding in the future for a number of reasons that are
beyond our control. For example, a yearly appropriation process in Congress
applies to some programs, and they may be eliminated due to budget reductions.
Additionally, we may not receive funds under existing or future grants because
of budget constraints of the agency administering the program. The loss of our
current or future government grants would decrease our near-term revenues and
increase our net losses.



     IF THE CURRENCY EXCHANGE RATE BETWEEN U.S. DOLLARS AND DEUTSCHE MARKS
     FLUCTUATES, THEN OUR SALES MAY BE LOWER AND OUR COSTS MAY BE INCREASED.



     We expect that a significant portion of our revenue over the next few years
will be derived from our sale in North America of Zeiss' Ultra High Throughput
Screening System. We must pay for this Zeiss equipment in Deutsche Marks,
although our customers will pay us in U.S. dollars. If adverse fluctuations in
the currency exchange rate between the U.S. dollar and the Deutsche Mark occur,
we could lose sales because these products would be disadvantageously priced
compared to competitive products that are priced only in dollars. In addition,
we buy components from Zeiss for our ArrayScan II, ArrayScan Kinetics
Workstation and ArrayScan Kinetics Reader in Deutsche Marks. If adverse
fluctuations in the currency exchange rate between the U.S. dollar and the
Deutsche Mark occur, our costs could materially increase. We recognize foreign
currency gains or losses arising from our operations in the period incurred. As
a result, currency fluctuations between the U.S. dollar and the currencies in
which we do business will cause foreign currency translation gains and losses.
We cannot predict the effects of exchange rate fluctuations upon our future
operating results because of the variability of currency exposure and the
potential volatility of currency exchange rates. We may use hedging instruments,
including forward contracts, to minimize any foreign currency rate fluctuation
exposure. We cannot assure you that any hedging transaction will adequately
protect us against currency rate fluctuations or that these transactions will
not result in losses to us.


                                       13
<PAGE>   16

     RISKS RELATED TO THIS OFFERING

     SOME OF OUR EXISTING STOCKHOLDERS CAN EXERT SIGNIFICANT INFLUENCE OVER US.
     IF THEY MAKE DECISIONS THAT ARE NOT IN THE BEST INTERESTS OF ALL
     STOCKHOLDERS, THEN OUR STOCK PRICE MAY DECLINE.


     Immediately following this offering, our directors and executive officers
and their affiliates will beneficially own, in the aggregate, approximately 60%
of our outstanding common stock, or 42% if the underwriters' over-allotment
option is exercised in full. As a result, these stockholders as a group could
substantially influence our management and affairs and any matter submitted to
our stockholders for approval, including the election of directors, any merger,
consolidation or sale of all or substantially all of our assets and any other
significant corporate transaction. If these stockholders acted together, they
could cause a result which may not be in the best interest or interests of all
stockholders. In addition, the interests of this concentration of ownership may
not always coincide with our interests or the interests of other stockholders
and accordingly, this concentration could cause us to enter into transactions or
agreements which we would not otherwise consider. The concentration of ownership
may also delay or prevent a change of control of Cellomics. As a result, the
stock could be adversely affected.


     YOUR INVESTMENT IN OUR STOCK MAY DECLINE IN VALUE FROM THE INITIAL PUBLIC
     OFFERING PRICE.


     The initial public offering price will be determined by negotiations
between the representatives of the underwriters and us, and may not be
indicative of future market prices. Among many factors which we and the
representatives may consider in determining the initial public offering price of
the common stock are estimates of our business potential and the market
valuations of other biotechnology companies. In the event these estimates are
inaccurate or if market prices for biotechnology companies experience volatility
after the offering, your investment in our stock may be worth less in the future
than it was worth when you made your investment.



     A LARGE NUMBER OF SHARES COULD BE SOLD IN THE MARKET FOLLOWING THIS
     OFFERING, WHICH MAY DEPRESS THE MARKET PRICE OF OUR COMMON STOCK.



     Sales of a substantial number of shares of our common stock in the public
market following this offering or the perception that such sales could occur
could cause the market price of our common stock to decline or adversely affect
our future ability to raise capital through an offering of equity securities.
Federal securities law and lock-up agreements that our stockholders have entered
into with the underwriters and with us limit the number of shares of common
stock available for sale in the public market. Our officers, directors and
stockholders have agreed in these lock-up agreements not to offer or sell shares
of common stock or securities convertible into or exchangeable for shares of
common stock for a period of 180 days after the date of this prospectus without
the prior written consent of Prudential Securities Incorporated. Prudential
Securities Incorporated may, at any time and without notice waive any of the
terms of these lock-up agreements.



     The following table indicates the dates for sale into the public market of
the 14,124,002 shares of our common stock that are not being sold in the
offering but which were outstanding as of August 31, 2000:



<TABLE>
<CAPTION>
 NUMBER OF
   SHARES               AVAILABILITY FOR RESALE INTO PUBLIC MARKET
------------   ------------------------------------------------------------
<C>            <S>
  13,582,702   180 days after the date of this prospectus due to lock-up
               agreements substantially all of our stockholders have
               entered into with Prudential Securities Incorporated (except
               35,320 shares eligible for resale on the date of this
               prospectus)
     541,300   Between 180 and 365 days after the date of this prospectus
               due to requirements of the federal securities laws.
</TABLE>


                                       14
<PAGE>   17

     OUR MANAGEMENT WILL HAVE BROAD DISCRETION TO ALLOCATE THE NET PROCEEDS OF
     THIS OFFERING AND THE USE OF THESE PROCEEDS MAY NOT YIELD FAVORABLE
     RETURNS.


     Our management will retain broad discretion allocating the proceeds of this
offering. Although we plan to use these proceeds as described under "Use of
Proceeds" on page 17, we may also use a portion of the net proceeds of this
offering for the acquisition of or investment in companies, technologies or
assets that complement our business. We have no specific allocations for
approximately 80% of the net proceeds of this offering. Consequently, management
will retain a significant amount of discretion over the allocation of these
proceeds. Our management may utilize these proceeds in ways that do not yield
favorable returns.


     AS A NEW INVESTOR IN OUR COMMON STOCK, YOU WILL EXPERIENCE IMMEDIATE AND
     SUBSTANTIAL DILUTION IN THE BOOK VALUE OF YOUR SHARES.


     The initial public offering price substantially exceeds the pro forma net
tangible book value per share of our common stock which, as of June 30, 2000 was
$0.19 per share. If you purchase our common stock in this offering you will
incur immediate and substantial dilution of $12.21 per share, based on an
assumed public offering price of $17.00 per share. You will incur additional
dilution upon the exercise of outstanding stock options and warrants.


     SOME PROVISIONS OF OUR CERTIFICATE OF INCORPORATION AND BYLAWS AND DELAWARE
     LAW MAY DELAY OR PREVENT A TAKEOVER AND SUPPRESS OUR STOCK PRICE.

     Some provisions in our certificate of incorporation and bylaws may have the
effect of delaying, deferring or preventing an acquisition, merger or other
change of control of our company, despite the possible benefits to our
stockholders, or otherwise adversely affect the price of our common stock. These
provisions include the following:

     - the ability of our board of directors to issue shares of preferred stock
       and to determine the price and other terms, including preferences and
       voting rights, of those shares without stockholder approval;

     - a staggered board of directors and the limited ability of stockholders to
       remove our directors;

     - a limitation on who may call special meetings of stockholders; and

     - advance notice requirements for nomination for election to our board of
       directors or for proposing matters that can be acted on by stockholders
       at stockholder meetings.

     In addition to these provisions, we are subject to certain Delaware laws,
including one that prohibits us from engaging in a business combination with any
interested stockholder for a period of three years from the date the person
became an interested stockholder unless certain conditions are met. The
provisions of our certificate of incorporation and bylaws and Delaware law may
discourage potential takeover attempts, discourage bids for our common stock at
a premium over market price or could adversely affect the market price of, and
the voting and other rights of the holders of, our common stock. As a result,
the market price of our common stock could be adversely affected.

                                       15
<PAGE>   18

                           FORWARD-LOOKING STATEMENTS

     This prospectus includes forward-looking statements. We have based these
forward-looking statements largely on our current expectations and projections
about future events and financial trends affecting the financial condition of
our business. These forward-looking statements are subject to a number of
factors, including, among other things:

     - failure to successfully commercialize our products and technologies;

     - market acceptance of our products and technologies;

     - relationships with our collaboration partners;

     - ability to enter into future collaboration agreements;

     - general economic and business conditions, both nationally and in our
       markets;

     - our expectations and estimates concerning future financial performance
       and financing plans;

     - competition and technological change;

     - future regulations that may affect our business; and

     - other factors set forth under "Risk Factors" in this prospectus.


     In addition, in this prospectus, the words "believe," "may," "will,"
"estimate," "continue," "anticipate," "intend," "expect," "predict," "potential"
and similar expressions, as they relate to Cellomics, Inc., our business and our
management, are intended to identify forward-looking statements. In light of
these risks and uncertainties, the forward-looking events and circumstances
discussed in this prospectus may not occur and actual results could differ
materially from those anticipated or implied in the forward-looking statements.


                                       16
<PAGE>   19

                                USE OF PROCEEDS


     We estimate our net proceeds to be approximately $94.0 million, or $108.2
million if the underwriters exercise their over-allotment option in full, from
the sale of the shares of common stock in this offering, assuming a public
offering price of $17.00 per share and after deducting underwriting discounts
and commissions and estimated offering expenses of approximately $1.3 million.


     We intend to use these net proceeds primarily for:

     - technology research and product and services development;

     - scale-up of sales and marketing;

     - capital expenditures;

     - working capital; and

     - general corporate purposes.


     We currently anticipate that over the next two years, we will use
approximately one-fifth of the net proceeds from this offering for research and
development expenses to expand our technologies and products. We also intend to
use approximately $2.2 million for the payment of dividend arrearages at the
anticipated closing date of this offering to all of our preferred stockholders
in accordance with the terms of our preferred stock. We may also use a portion
of the net proceeds for the acquisition of, or investment in, companies,
technologies, products or assets that complement our business. The amounts and
timing of our actual expenditures will depend upon numerous factors, including
the status of our product development and commercialization efforts, the amount
of proceeds actually raised in this offering, the amount of cash generated by
our operations, competitive forces, sales and marketing activities, changes in
or termination of existing collaboration and licensing arrangements and our need
for manufacturing capacity. We have no present understandings, commitments or
agreements to enter into any potential acquisitions or investments. Other than
the approximately $2.2 million for the payment of dividend arrearages and the
proceeds we have identified for research and development, we have not determined
the amounts we plan to spend on any of the areas listed above or the timing of
these expenditures. As a result, our management will have broad discretion to
allocate the net proceeds of this offering. Pending such uses, we intend to
invest the net proceeds of this offering in short-term, investment-grade
interest-bearing securities or guaranteed obligations of the U.S. government.


                                DIVIDEND POLICY

     We have never declared or paid and do not anticipate declaring or paying
any cash dividends on our common stock in the near future. Any future
determination as to the declaration and payment of dividends, if any, will be at
the discretion of our board of directors and will depend on then existing
conditions, including our financial condition, operating results, contractual
restrictions, capital requirements, business prospects and other factors our
board of directors may deem relevant.

                                       17
<PAGE>   20

                                 CAPITALIZATION

     The following table shows:


        - our capitalization and short-term debt on June 30, 2000;



        - our capitalization and short-term debt on June 30, 2000, on a pro
          forma basis, giving effect to:



           - the sale of 541,300 shares of our common stock on July 3, 2000 for
             aggregate proceeds of $4.8 million;



           - the conversion of our Series A and Series B preferred stock into
             common stock;



        - our capitalization and short-term debt on June 30, 2000 on a pro forma
          as adjusted basis giving effect to the sale of 6,000,000 shares of our
          common stock in this offering, assuming an initial public offering
          price of $17.00 per share and the receipt and application of the net
          proceeds from this offering.



<TABLE>
<CAPTION>
                                                                       AS OF JUNE 30, 2000
                                                              --------------------------------------
                                                                           (UNAUDITED)
                                                                                          PRO FORMA
                                                                                             AS
                                                               ACTUAL      PRO FORMA     ADJUSTED(1)
                                                              --------     ---------     -----------
                                                                   (IN THOUSANDS, EXCEPT SHARE
                                                                       AND PER SHARE DATA)
<S>                                                           <C>          <C>           <C>
Current maturities of long-term debt........................  $  1,000     $  1,000       $  1,000
                                                              ========     ========       ========
Long-term debt less current maturities......................  $  1,623     $  1,623       $  1,623
                                                              --------     --------       --------
Mandatorily redeemable convertible preferred stock, $.01 par
  value; 9,622,934 shares authorized, 9,396,155 shares
  issued and outstanding, actual; no shares authorized,
  issued, or outstanding, pro forma and pro forma as
  adjusted..................................................    20,916           --             --
                                                              --------     --------       --------
Stockholders' equity (deficit):
  Preferred stock, $.01 par value; no shares authorized,
    issued or outstanding, actual and pro forma; 17,660,000
    shares authorized, no shares issued and outstanding pro
    forma, as adjusted......................................        --           --             --
  Common stock, $.01 par value, 21,192,000 shares
    authorized, 4,186,547 shares issued and outstanding,
    actual; 21,192,000 shares authorized, 14,124,002 shares
    issued and outstanding pro forma; 176,600,000 shares
    authorized, 20,124,002 shares issued and outstanding,
    pro forma, as adjusted..................................        42          141            201
  Additional paid-in capital................................    10,627       34,367        127,917
  Deferred compensation.....................................    (5,920)      (5,920)        (5,920)
  Accumulated deficit.......................................   (25,876)     (25,876)       (25,876)
                                                              --------     --------       --------
  Total stockholders' equity (deficit)......................   (21,127)       2,712         96,322
                                                              --------     --------       --------
  Total capitalization......................................  $  1,413     $  4,335       $ 97,945
                                                              ========     ========       ========
</TABLE>


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


(1)  The number of shares as adjusted for this offering excludes:



    - 2,623,923 shares of common stock reserved for issuance under our stock
      option plans, of which 1,741,477 shares were subject to outstanding
      options as of June 30, 2000, at a weighted average exercise price of
      $0.49; and



    - 1,575,166 shares of common stock issuable on exercise of outstanding
      warrants as of June 30, 2000, at a weighted average exercise price of
      $2.18.


                                       18
<PAGE>   21

                                    DILUTION


     You will experience immediate and substantial dilution in the net tangible
book value of your common stock. Net tangible book value is our total assets
minus the sum of our total liabilities, mandatorily redeemable convertible
preferred stock and intangible assets. Net tangible book value per share is net
tangible book value divided by the number of shares of common stock outstanding.
At June 30, 2000, we had net tangible book value (deficit) of $(21.1) million,
or $(5.05) per share of common stock. The sale of 541,300 shares of our common
stock for net proceeds of $4.8 million after June 30, 2000 would increase net
tangible book value by $4.8 million or $1.59 per share. The assumed conversion
of our Series A and Series B preferred stock that will occur upon the closing of
this offering would increase net tangible book value by $19.0 million or $3.65
per share at June 30, 2000 on a pro forma basis. The pro forma net tangible book
value after giving effect to the sale of our common stock and the conversion of
our Series A and Series B preferred stock, is $2.7 million or $0.19 per share.
After giving effect to the sale of shares of our common stock in this offering
at an assumed initial public offering price of $17.00 per share and receipt and
application of the net proceeds therefrom after deducting underwriting discounts
and commissions and estimated offering expenses, our pro forma as adjusted net
tangible book value at June 30, 2000 would have been $96.3 million, or $4.79 per
share. This represents an immediate increase in net tangible book value of $4.60
per share to existing stockholders and an immediate and substantial dilution of
$12.21 per share to new investors purchasing our common stock in this offering.
The following table illustrates this per share dilution.



<TABLE>
<S>                                                           <C>       <C>
Assumed initial public offering price.......................            $17.00
                                                                        ------
     Net tangible book value (deficit) per share as of June
      30, 2000..............................................  $ (5.05)
     Increase attributable to sale of common stock after
      June 30 but prior to this offering....................     1.59
     Increase attributable to conversion of Series A and
      Series B
       preferred stock......................................     3.65
                                                              -------
     Pro Forma net tangible book value as of June 30,
      2000..................................................     0.19
     Increase in net tangible book value attributable to new
      investors.............................................     4.60
                                                              -------
Pro forma as adjusted net tangible book value as of June 30,
  2000, after giving effect to this offering................              4.79
                                                                        ------
Dilution to new investors...................................            $12.21
                                                                        ======
</TABLE>


     The following table shows the difference between existing stockholders and
new investors in this offering with respect to the number of shares of common
stock purchased from us, the total consideration paid and the average price paid
per share, before deducting underwriting discounts and commissions and offering
expenses.


<TABLE>
<CAPTION>
                                  SHARES PURCHASED           TOTAL CONSIDERATION
                                ---------------------      -----------------------      AVERAGE PRICE
                                  NUMBER      PERCENT         AMOUNT       PERCENT        PER SHARE
                                ----------    -------      ------------    -------      -------------
<S>                             <C>           <C>          <C>             <C>          <C>
Existing stockholders.........  14,124,002     73.85%      $ 26,192,630     20.43%         $ 1.85
New investors.................   6,000,000     26.15        102,000,000     79.57           17.00
                                ----------     -----       ------------     -----
       Total..................  20,124,002     100.0%      $128,192,630     100.0%
                                ==========     =====       ============     =====
</TABLE>



     The discussion and tables above assume no exercise of outstanding options
or warrants to purchase shares of common stock. As of August 31, 2000, 2,623,923
shares of common stock were authorized for issuance under our stock option
plans, of which 1,741,477 shares were subject to outstanding options, at a
weighted average exercise price of $0.49, and 1,575,166 shares of common stock
were issuable upon exercise of outstanding warrants as of August 31, 2000, at a
weighted average exercise price of $2.18. To the extent that any outstanding
options or warrants are exercised, new investors will experience further
dilution.


                                       19
<PAGE>   22

                            SELECTED FINANCIAL DATA


     We derived the statement of operations data for each of the years ended
December 31, 1997, 1998 and 1999 and the balance sheet data as of December 31,
1998 and 1999 from our financial statements included elsewhere in this
prospectus which have been audited by PricewaterhouseCoopers LLP, independent
accountants. We derived the statements of operations data for the period from
May 3, 1995, the date of inception, to December 31, 1995 and the year ended
December 31, 1996, and the balance sheet data as of December 31, 1995, 1996 and
1997 from our audited financial statements not included in this prospectus. The
statements of operations data set forth below for the six-month period ended
June 30, 1999 and 2000 and the balance sheet data as of June 30, 2000 have been
derived from our unaudited interim financial statements which are included
elsewhere in this prospectus. The interim financial information has been
prepared on a basis consistent with that of the audited financial statements
and, in the opinion of our management, includes all adjustments, consisting only
of normal recurring adjustments, necessary for a fair presentation of results of
operations and financial position. Our historical results are not necessarily
indicative of results to be expected for any future period. We derived the data
presented below from financial statements that have been prepared in accordance
with accounting principles generally accepted in the United States and should be
read with our financial statements, including the notes, and with "Management's
Discussion and Analysis of Financial Condition and Results of Operations"
included elsewhere in this prospectus.



     The pro forma net loss per share for the year ended December 31, 1999 and
six-month period ended June 30, 2000 assumes conversion of the Series A and
Series B preferred stock outstanding at the end of each period into common stock
on a one-for-one basis at the beginning of each period, or the date of issuance,
if later. The Series A and Series B preferred stock will automatically convert
into common stock upon the closing of this offering.



     You should read the selected financial data together with our financial
statements and the sections of this prospectus entitled "Capitalization" and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."



<TABLE>
<CAPTION>
                                             FROM DATE                                                    SIX MONTHS
                                           OF INCEPTION             YEAR ENDED DECEMBER 31,             ENDED JUNE 30,
                                         (MAY 3, 1995) TO    --------------------------------------   ------------------
                                         DECEMBER 31, 1995    1996      1997      1998       1999      1999       2000
                                         -----------------   -------   -------   -------   --------   -------   --------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)      (UNAUDITED)
<S>                                      <C>                 <C>       <C>       <C>       <C>        <C>       <C>
STATEMENT OF OPERATIONS DATA:
Revenues...............................       $    36        $   363   $   395   $ 2,273   $  3,390   $ 1,115   $  3,987
Operating costs and expenses:
  Costs of product sales...............            --             --        --        --        405        --      1,209
  Research and development.............            57            257     1,486     3,948      9,509     3,975      6,248
  Selling, general and
    administrative.....................            83            578     1,334     1,834      3,933     1,845      3,387
                                              -------        -------   -------   -------   --------   -------   --------
    Total operating costs and
      expenses.........................           140            835     2,820     5,782     13,847     5,820     10,844
Loss from operations...................          (104)          (472)   (2,425)   (3,509)   (10,457)   (4,705)    (6,857)
Interest income (expense), net.........            (1)            (5)      (13)       14       (161)      102     (1,887)
                                              -------        -------   -------   -------   --------   -------   --------
Net loss...............................       $  (105)       $  (477)  $(2,438)  $(3,495)  $(10,618)  $(4,603)  $ (8,744)
Accrued and deemed dividends and
  accretion on mandatorily redeemable
  convertible preferred stock (1)......            --             --        --      (518)      (933)     (454)    (7,120)
                                              -------        -------   -------   -------   --------   -------   --------
Net loss attributable to common
  stockholders.........................       $  (105)       $  (477)  $(2,438)  $(4,013)  $(11,551)  $(5,057)  $(15,864)
                                              =======        =======   =======   =======   ========   =======   ========
Net loss per share-basic and diluted...       $ (0.05)       $ (0.13)  $ (0.61)  $ (0.99)  $  (2.77)  $ (1.21)  $  (3.79)
                                              =======        =======   =======   =======   ========   =======   ========
Shares used to compute basic and
  diluted net loss per share...........         1,917          3,588     3,986     4,070      4,175     4,168      4,183
                                              =======        =======   =======   =======   ========   =======   ========
Pro forma net loss per share (2).......                                                    $  (0.97)            $  (0.67)
                                                                                           ========             ========
Shares used to compute pro forma net
  loss per share (2)...................                                                      10,990               13,030
                                                                                           ========             ========
</TABLE>


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

(1)  Additional increases in net loss attributable to common stockholders due to
     dividends and accretion on mandatorily redeemable convertible preferred
     stock will not occur after this offering because all of the outstanding
     preferred stock will be converted to common stock upon the closing of this
     offering.



(2)  See Note 10 to our financial statements for an explanation of the number of
     shares used in computing pro forma net loss per share and the pro forma net
     loss attributable to common stockholders.


                                       20
<PAGE>   23


<TABLE>
<CAPTION>
                                                         AS OF DECEMBER 31,                   AS OF
                                             -------------------------------------------    JUNE 30,
                                             1995    1996     1997      1998      1999        2000
                                             ----   ------   -------   -------   -------   -----------
                                                                                           (UNAUDITED)
                                                                  (IN THOUSANDS)
<S>                                          <C>    <C>      <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
Cash and cash equivalents..................  $ 3    $1,389   $   319   $   662   $ 1,341    $    852
Working capital (deficit)..................   (8)    1,375      (806)      409    (1,223)       (305)
Total assets...............................   72     1,679       745     3,963     5,860       8,041
Total long-term debt less current
  maturities...............................   --        --       500       653     3,745       1,623
Mandatorily redeemable convertible
  preferred stock..........................   --        --        --     6,252    12,153      20,916
Total stockholders' equity (deficit).......   36     1,385    (1,053)   (4,994)  (15,734)    (21,127)
</TABLE>


                                       21
<PAGE>   24


                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS


     The following discussion and analysis should be read in conjunction with
the "Selected Financial Data," and the accompanying financial statements and
related notes included elsewhere in this prospectus. This discussion and other
parts of this prospectus contain forward-looking statements which involve risks
and uncertainties. Our actual results may differ materially from the results
discussed in these forward-looking statements. Factors that might cause such a
difference include those discussed in "Risk Factors" and elsewhere in the
prospectus.

OVERVIEW


     Since inception, we primarily focused on the development of high content
screening products consisting of instrumentation, fluorescence-based reagents
and cellular analysis products, data and information management software and
cellular bioinformatics. Our technologies and products are designed to extend
the power of genomics by defining the cellular functions of genes and proteins.
Our initial commercialization efforts focus on the pharmaceutical and
biotechnology industries. To fund in part our product development, we entered
into collaboration agreements with Johnson & Johnson, Merck & Co. and
Warner-Lambert. Under these agreements, we received funding for the development
of prototype instrumentation and cellular analysis products for initial testing.
In November 1999, we sold our first commercial products, the ArrayScan II and
Cellomics Store. We are now selling these products as well as our HitKits and
custom cellular analysis product development contracts and we expect to generate
additional revenue from the release of new products.



     Since our inception, we have incurred losses each year. Through June 30,
2000, we had an accumulated deficit of approximately $25.9 million. Our losses
have resulted principally from costs incurred in research and development, and
from selling, general and administrative costs associated with our operations.
We expect to make significant expenditures in further commercializing our
products and in the research and development of future products. Therefore, we
expect to incur additional operating losses over at least the next several years
as we continue to commercialize our products and fund future research and
development expenses.


RESULTS OF OPERATIONS


  SIX MONTHS ENDED JUNE 30, 2000 AND 1999



     Revenues. We recognize revenues from product sales upon shipment of the
product to the customer. We recognize development and collaboration agreement
and grant revenues on a straight-line basis over the contract period or as work
is performed. Where we deliver prototype instruments under collaboration
agreements, we recognize revenues when the prototype is shipped to the customer.
When we receive payment for revenues under maintenance, support or cellular
analysis product development contracts in advance of the services performed, we
record deferred revenue related to these agreements. Revenues increased to $4.0
million for the six months ended June 30, 2000 compared to $1.1 million for the
same period in 1999. The increase was attributable to sales of $2.9 million from
the ArrayScan II and Cellomics Store products. There were no commercial product
sales for the six months ended June 30, 1999.



     Costs of Product Sales. Costs of product sales consist primarily of labor
and material costs. Costs of product sales were $1.2 million for the six months
ended June 30, 2000 due to the sale of commercial products. There were no
commercial product sales or costs related to product sales for the six months
ended June 30, 1999.



     Research and Development Expenses. Research and development expenses
consist primarily of salaries and related personnel costs, materials costs,
amounts paid to consultants and contractors depreciation, facility costs and
other expenses related to the design, development, testing and enhancement of
our products. We expense research and development costs as incurred. Research
and development expenses increased to $6.2 million for the six months ended June
30, 2000 compared to $4.0 million for the same period in 1999.


                                       22
<PAGE>   25


Research and development expenses increased primarily as a result of increased
personnel costs related to product development. We expect our research and
development costs to increase over the next several years as we expand our
research and development efforts.



     Selling, General and Administrative Expenses. Selling, general and
administrative expenses consist of salaries and related personnel costs for
executive, sales, marketing, customer support, finance and other administrative
personnel, marketing expenses, recruiting expenses, professional fees, facility
costs, legal expenses associated with intellectual property and other corporate
expenses including business development. Selling, general and administrative
expenses increased to $3.4 million for the six months ended June 30, 2000
compared to $1.8 million for the same period in 1999. Selling, general and
administrative expenses increased due to the hiring of senior management and
sales personnel, marketing costs associated with the commercialization of our
initial products and other general costs necessary to support the expansion of
our business. We expect selling, general and administrative expenses to continue
to increase over the next several years to support the commercialization of our
products and our growing business activities.



     Amortization of Deferred Compensation. Deferred compensation for options
granted to employees represents the difference between the fair value of our
common stock and the exercise price of the options at the date of grant. We
initially record this amount as a charge to stockholders' equity with an
offsetting credit to additional paid-in-capital and amortize it over the vesting
period of the options, generally four years, using an accelerated method. We
account for stock-based employee compensation arrangements in accordance with
the provisions of Accounting Principles Board Opinion No. 25, "Accounting for
Stock Issued to Employees" ("APB 25") as amended by FASB Interpretation No. 44
(FIN 44) "Accounting for Certain Transactions Involving Stock Compensation - an
interpretation of APB 25," and comply with disclosure provisions of Statement of
Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" ("SFAS 123"). We determine deferred compensation for options
granted to consultants and other non-employees in accordance with SFAS 123 as
the fair value of the equity instruments issued when such fair value is more
readily determinable than the value of the services rendered. We include
amortization expense in the respective categories of expense in the statement of
operations. For the six months ended June 30, 2000 and 1999, respectively, as a
result of the grant of additional options we recorded unamortized deferred stock
compensation of $6.5 million and $239,501, respectively. We recorded
amortization of deferred compensation of $2.2 million and $237,820 for the six
months ended June 30, 2000 and 1999, respectively. At June 30, 2000, unamortized
deferred stock compensation was $5.9 million. We expect to record amortization
of deferred compensation of approximately $2.8 million over the last two
quarters of 2000, $2.0 million in 2001, $890,000 in 2002 and $204,000 in 2003,
relating to options granted in 1997, 1998, 1999 and through the second quarter
of 2000. The amount of deferred compensation to be amortized in future periods
may differ from these amounts if the unvested options for which deferred
compensation has been recorded are subsequently cancelled or accelerated. We do
not expect to incur deferred compensation expense for option grants made in the
future since the plan provisions require the exercise price of options to be at
or above the fair value of the stock at the date of grant.



     Interest Income (Expense), Net. Interest expense for the six-month period
ended June 30, 2000 was approximately $2.0 million compared to $67,034 for the
same period in 1999. Interest expense increased primarily due to a $1.7 million
one-time non-cash charge related to common stock purchase warrants issued during
the first half in connection with the convertible demand notes dated November
30, 1999 as well as increased borrowings under equipment financing lines of
credit and a senior term note. Interest income for the six-month period ended
June 30, 2000 was $95,452 compared to $169,902 for the same period in 1999.



     Provision for Income Taxes. We incurred a net operating loss for the
six-months ended June 30, 2000 and consequently, we did not accrue or pay any
federal, state or foreign income taxes. As of June 30, 2000, we had federal and
state net operating loss carryforwards of approximately $20.7 million. The net
operating losses and credit carryforwards expire at various dates beginning in
2015 through 2019. The state of Pennsylvania net operating losses will expire at
various dates beginning in 2005 through 2009. Utilization of net operating
losses and credit carryforwards will be subject to an annual limitation due to
the change in ownership provisions of the Internal Revenue Code of 1986 and
similar state provisions. The annual limitations will likely result in the
expiration of net operating losses and credits before utilization.

                                       23
<PAGE>   26


Management believes that there is sufficient uncertainty regarding the
realization of deferred tax assets such that a full valuation allowance has been
provided against these assets.



     Deemed Dividend Upon Issuance of Convertible Preferred Stock. On February
23, 2000, we issued convertible preferred stock which contained a beneficial
conversion feature resulting in a one-time non-cash deemed dividend of $6.5
million in the six-month period ended June 30, 2000. We recorded the deemed
dividend by offsetting charges and credits to additional paid-in capital,
without any effect on total stockholders' equity. The deemed dividend increased
the loss attributable to common stockholders in the calculation of basic net
loss per share for the six-month period ended June 30, 2000.


  YEARS ENDED DECEMBER 31, 1999 AND 1998


     Revenues. Revenues increased to $3.4 million for the year ended December
31, 1999 compared to $2.3 million for 1998. The increase was attributable to our
sales of ArrayScan II and Cellomics Store products beginning in November 1999.
In addition, we recognized increased revenues associated with a grant awarded in
September 1998 by the Defense Advanced Research Project Agency, or DARPA, due to
a full year of activity during 1999.



     Costs of Product Sales. Costs of product sales were $405,000 for the year
ended December 31, 1999 due to the sale of commercial products beginning in
November 1999. There were no commercial product sales or costs related to
product sales in 1998.



     Research and Development Expenses. Research and development expenses
increased to $9.5 million for the year ended December 31, 1999 compared to $3.9
million for 1998. The increase was primarily attributable to increased costs
associated with the development of prototype instrument products under a
development and manufacturing agreement with Zeiss, hiring of additional
personnel in product development and a full year of costs associated with the
DARPA grant.



     Selling, General and Administrative Expenses. Selling, general and
administrative expenses increased to $3.9 million for the year ended December
31, 1999 compared to $1.8 million for 1998. The increase was attributable
primarily to the hiring of senior management and sales personnel, marketing
costs associated with the commercialization of our initial products and other
general costs necessary to support the expansion of our business.



     Amortization of Deferred Compensation. For the years ended December 31,
1998 and 1999, we recorded unamortized deferred stock compensation of $259,000
and $2.4 million, respectively. We amortized deferred compensation of $71,000
and $690,000 for the years ended December 31, 1998 and 1999, respectively. The
amortization expense is included in the respective categories of expense in the
statement of operations.


     Interest Income (Expense), Net. Interest expense for the year ended
December 31, 1999 increased to $302,000 from $44,000 in 1998, due primarily to
additional borrowing under equipment financing lines of credit and a senior term
note. Interest and other income for the year ended December 31, 1999 increased
to $141,000 from $59,000 in 1998. The increase is due to higher average cash
balances in 1999.


     Provision for Income Taxes. We incurred net operating losses for the year
ended December 31, 1998 and 1999 and consequently, we did not pay any federal,
state or foreign income taxes. As of December 31, 1999, we had federal and state
net operating loss carryforwards of approximately $15.5 million. We also had
federal research and development tax credit carryforwards of approximately
$725,000.


  YEARS ENDED DECEMBER 31, 1998 AND 1997

     Revenues. Revenues increased to $2.3 million for the year ended December
31, 1998 compared to $394,935 for 1997. The increase was primarily derived from
revenues from collaboration agreements with Johnson & Johnson, Merck and
Warner-Lambert and from work performed under the DARPA grant awarded to us in
September 1998.

                                       24
<PAGE>   27

     Research and Development Expenses. Research and development expenses
totaled $3.9 million for the year ended December 31, 1998 compared to $1.5
million for 1997. The increase was primarily attributable to increased costs
associated with the collaboration agreements as well as additional costs
associated with the DARPA project.

     Selling, General and Administrative Expenses. Selling, general and
administrative expenses totaled $1.8 million for the year ended December 31,
1998 compared to $1.3 million for 1997. The increase was primarily due to
increased personnel and facility costs to support our growth, increased legal
expenses associated with intellectual property and increased corporate expenses
associated with business development.

     Amortization of Deferred Compensation. We recorded deferred compensation of
$259,344 and amortization of deferred compensation of $71,242 for the year ended
December 31, 1998. For the year ended December 31, 1997, we recorded no deferred
compensation or amortization of deferred compensation. Amortization of deferred
compensation is included in the respective categories of expense in the
statement of operations.

     Interest Income (Expense), Net. Interest expense for the year ended
December 31, 1998 increased to $43,944 from $37,950 in 1997 due primarily to the
interest expense associated with our equipment financing line of credit.
Interest and other income for the year ended December 31, 1998 increased to
$58,555 from $25,309 in 1997. The increase was due to higher average cash
balances in 1998.

     Provision for Income Taxes. We incurred net operating losses for the year
ended December 31, 1998, and consequently we did not pay any federal, state or
foreign income taxes. As of December 31, 1998, we had federal and state net
operating loss carryforwards of $6.2 million. We also had federal research and
development tax credit carryforwards of approximately $283,000.

LIQUIDITY AND CAPITAL RESOURCES


     From inception, we financed our operations primarily from the sale of
common and preferred stock, collaboration agreements and grants, equipment
financing arrangements, a senior term loan and recently from revenues from
initial product sales. Through June 30, 2000, we received proceeds of $19.1
million from the issuances of equity securities and $8.7 million from product
sales, collaboration agreements and grants. In addition, we received $5.7
million from debt financings, of which $2.3 million was subsequently converted
into equity.



     As of June 30, 2000, we had cash and cash equivalents of $852,306 and
borrowing availability of $2.7 million under an equipment financing arrangement.
Cash used in operating activities increased to $5.9 million for the six-month
period ended June 30, 2000 compared to $3.8 million for the same period in 1999
and $7.2 million for 1999 compared to $4.3 million in 1998. The increases were
primarily due to increased costs associated with the expansion of the business
partially offset by revenues from product sales and collaboration agreements and
grants.



     Capital expenditures for property and equipment were $205,421, $1.4
million, $1.1 million and $619,021 in 1997, 1998, 1999 and for the six-month
period ended June 30, 2000, respectively. We expect to continue to make
significant investments in the purchase of property and equipment to support our
expanding operations.



     We received $500,000, $6.1 million, $9.2 million and $6.5 million from
financing activities in 1997, 1998, 1999 and for the six-month period ended June
30, 2000, respectively, which consisted principally of net proceeds of $16.6
million from the sale of preferred stock and $5.7 million from proceeds from
debt financings. In September 1998, we entered into a $1.5 million non-revolving
equipment financing line of credit. At June 30, 2000, we had borrowed
approximately $1.5 million under the line of credit and, net of repayments,
approximately $1.0 million was outstanding with interest rates ranging from
12.7% to 12.9%. In June 1999, we entered into a $1.5 million senior term loan
payable in thirty equal monthly installments commencing after a six-month
interest-only period. Our assets secure the term loan and include all of our
intellectual property but exclude $5.0 million in equipment acquired under
separate equipment financing facilities. Upon the closing of this offering, the


liens on our intellectual property will be released. At June 30,

                                       25
<PAGE>   28


2000, $1.2 million was outstanding under the term loan at an interest rate of
12.5%. In July 1999, we entered into a $3.0 million non-revolving equipment
financing facility. At June 30, 2000, we had borrowed approximately $321,000
under that facility with interest rates at 11.0% to 12.0%. As of June 30, 2000,
we had approximately $78,202 in capitalized lease obligations outstanding.



     On February 3, 2000, we entered into a development, manufacturing and
supply agreement with Zeiss which supersedes an agreement we entered into in
April 1998. Additionally, we have capital expenditure commitments to Zeiss of
$1.2 million during 2000. In connection with this agreement, we agreed to
reimburse Zeiss for an additional $2.0 million for development costs incurred by
Zeiss through December 31, 1999. These amounts are payable during 2000 and 2001
in equal installments of $1.0 million.


     Our capital requirements depend on numerous factors, including the status
of our product development and commercialization efforts, the amount of proceeds
actually raised in this offering, the amount of cash generated by our
operations, competitive factors, sales and marketing activities, changes in, or
termination of, existing licensing arrangements and our need for manufacturing
capacity. We expect to devote substantial capital resources to continue our
research and development efforts, to expand our support and product development
activities and for other general corporate activities. We believe that the net
proceeds of this offering, together with existing cash and marketable
securities, borrowings under equipment financing arrangements and anticipated
cash generated from product sales, will be sufficient to support our operations
through 2001. We could require additional financing in the future which may not
be available when needed or under favorable terms and conditions. Our failure to
raise capital when needed may harm our business and operating results. To the
extent that we raise additional capital by issuing equity securities,
stockholders will experience dilution.

RECENT ACCOUNTING PRONOUNCEMENTS


     In June 1998, the Financial Accounting Standards Board issued Statement No.
133 (SFAS 133), "Accounting for Derivative Instruments and Hedging Activities,"
which provides a comprehensive and consistent standard for the recognition and
measurement of derivatives and hedging activities. Under the statement, every
derivative is recorded in the balance sheet as either an asset or a liability
measured at its fair value. The statement requires that changes in the fair
value of a derivative be recognized currently in earnings unless specific hedge
accounting criteria are met. SFAS 133 is effective for fiscal years beginning
after June 15, 2000. We do not expect the adoption of SFAS 133 to have a
material impact on our results of operations or financial condition.



     In December 1999, the SEC issued Staff Accounting Bulletin 101, or SAB 101,
Revenue Recognition, which outlines the basic criteria that must be met to
recognize revenue and provides guidance for presentation of revenue and for
disclosure related to revenue recognition policies in financial statements filed
with the SEC. The adoption of SAB 101 did not have a material impact on our
financial position and results of operations.



     In March 2000, the FASB issued Interpretation No. 44 (or FIN 44)
"Accounting for Certain Transactions Involving Stock Compensation - an
Interpretation of APB 25". This Interpretation clarifies (a) the definition of
employee for purposes of applying APB 25, (b) the criteria for determining
whether a plan qualifies as a noncompensatory plan, (c) the accounting
consequence of various modifications to the terms of a previously fixed stock
option or award, and (d) the accounting for an exchange of stock compensation
awards in a business combination. This Interpretation is effective July 1, 2000,
but certain conclusions in this Interpretation cover specific events that occur
after either December 15, 1998, or January 12, 2000. The adoption of certain of
the conclusions of FIN 44 covering events occurring during the period after
December 15, 1998 or January 12, 2000 did not have a material effect on the
Company's financial position and results of operations. The Company does not
expect that the adoption of the remaining conclusions will have a material
effect on the financial position and results of operations.


                                       26
<PAGE>   29

DISCLOSURE ABOUT MARKET RISK

  INTEREST RATE RISK

     We currently maintain an investment portfolio of primarily money market
investments and certificates of deposits with maturities of less than 90 days.
The securities in our investment portfolio are not leveraged and, due to their
short-term nature, are subject to minimal interest rate risk. Therefore, we
currently do not hedge interest rate exposure. Due to the short term maturities
of these investments, we do not believe that an increase in market rates would
have any significant negative impact on the realized value of our investment
portfolio. However, an increase in interest rates may negatively impact the
interest expense on undrawn equipment financing.

  FOREIGN CURRENCY RATE FLUCTUATIONS


     Our commitments to Zeiss described above are denominated in Deutsche Marks.
Also, under our agreement with Zeiss, the ArrayScan Kinetics Workstation,
ArrayScan Kinetics Reader and Zeiss' Ultra High Throughput Screening System will
be sold to us at a transfer price denominated in Deutsche marks. This will
create an exposure to foreign currency rate fluctuations. Any foreign currency
revenues and expenses are translated using monthly average exchange rates
prevailing during the year and any transaction gains and losses are included in
net income. We may use hedging instruments including forward contracts to
minimize any foreign currency rate fluctuation exposure. We cannot assure you
that any hedging transaction will adequately protect us against currency rate
fluctuations or that these transactions will not result in losses to us.


YEAR 2000 COMPLIANCE

     The Year 2000 issue refers generally to the problems that some software may
have in distinguishing whether "00" means 1900 or 2000 and the potential for the
creation of erroneous data or systems failures which could disrupt normal
business activities. Due to the fact that we are a relatively new company and
have planned for Year 2000 effects, we have not incurred material expenses
associated with Year 2000 compliance.


     Many of our products contain our software or third party software programs.
We designed our software programs to be Year 2000 compliant and as of August 31,
2000, have not experienced any material difficulties. Nevertheless, we do use
and rely on a wide variety of information technologies, computer systems and
scientific and manufacturing equipment containing computer-related components
(such as programmable logic controllers and other embedded systems). As a
result, time-sensitive functions of those software programs and equipment may
yet misinterpret dates after January 1, 2000 to refer to the twentieth century
rather than the twenty-first century. Although we do not anticipate any material
problems, we could suffer system or equipment shutdowns, failures or
miscalculations. Such conditions could result in inaccuracies in computer output
or disruptions of operations, including, among other things, inaccurate
processing of financial information and/or temporary inabilities to process
transactions, manufacture products, or engage in similar normal business
activities.


     In addition, although all of our significant suppliers and our significant
service providers indicated that they were or expected to be Year 2000 compliant
by December 31, 1999, and although as of the date of this prospectus we are not
aware of any material Year 2000 compliance problems with these third parties'
systems, we cannot be certain that the representations of these third parties
were accurate or that their systems are or will continue to be Year 2000
compliant. If any of our significant suppliers or significant service providers
experience Year 2000 compliance problems and we are unable to replace them with
alternate sources, our business would be harmed.

                                       27
<PAGE>   30

                                    BUSINESS

OVERVIEW

     We are a pioneer in the emerging field of cellomics. We believe that the
field of cellomics will extend the recent advances in genomics and proteomics.
We design our products to:

     - measure the physical position and activity over time of cells and
       cellular components;

     - extract information about cells, cellular components and their functions;
       and

     - create new knowledge about cells and enable researchers to access a
       digital "virtual cell."


     We are working to commercialize our products as an integrated solution to
address the current bottlenecks in drug discovery. We believe that our products
and technologies will provide the pharmaceutical and biotechnology industries
with extensive information about cellular structure and function, in an
automated fashion. Our products are intended to seamlessly link the generation
of data, the extraction of information and the creation of knowledge of the
workings of the cell. In addition to drug discovery, we believe our products are
applicable to basic biomedical research, clinical diagnostics and agriculture.


INDUSTRY BACKGROUND

  THE CELL

     The cell is the fundamental unit of life and the building block of all
living organisms. The components of cells, such as genes and proteins, do not
independently reproduce themselves or respond to changes in their environment,
and are not, themselves, alive. The cell is the most basic biological unit with
these abilities. The adult human has trillions of cells of approximately 200
types, each with a different function, but all with similar structures and
internal workings. Every cell contains a copy of an organism's genetic
blueprint, as well as the machinery required to turn the blueprint into
proteins. These proteins perform the majority of cellular functions. In addition
to proteins, cells also contain a variety of other molecules that are also vital
for cellular function.

     The breakdown of normal cellular function as a result of abnormalities in
genes and the expression of proteins causes all disease. Research aimed at
understanding how cells work may lead to the development of new drugs or
therapies addressing disease at the cellular level. In addition, this
understanding may lead to advances in other areas of life sciences including
basic biomedical research, diagnostics and agriculture markets. A detailed
knowledge of the workings of the cell builds on our present understanding of
genomics and proteomics.

  GENOMICS AND PROTEOMICS

     Genomics is the study of deoxyribonucleic acid, or DNA, and messenger
ribonucleic acid, or mRNA, which are the biomolecules that contain and convey
the information required for protein production and for all cellular functions.
DNA contains the genetic blueprint of all organisms. The complete sequence of an
organism's DNA is called the genome. Interest in understanding the relationships
between genes and disease has generated a worldwide effort to identify and
sequence genes, leading to the identification of new targets for drug discovery
and gene therapy. The introduction of automated DNA sequencers and searchable
DNA sequence databases helped to create the field of genomics.

     Proteomics is the study of the structures, chemical modifications and
functions of an organism's complete collection of proteins, the major targets
for drug discovery. Proteins are the molecular machines of the cell that are
responsible for performing the majority of cellular functions. The complete set
of proteins within an organism is called the proteome. Interest in understanding
the relationships between protein functions and disease has generated a global
initiative to define the structure and function of every protein. This task is
challenging because any given cell type expresses only ten to twenty percent of
all genes. Furthermore, selected proteins are present only during a portion of
the life cycle of a cell.

     Both genomics and proteomics provide important components of understanding
cellular function and disease, but they do not provide a complete understanding
of cellular function. Understanding how different

                                       28
<PAGE>   31

genes and proteins act in tandem to perform functions at the cellular level is
critical to improving productivity in drug discovery and other life sciences
applications. Drugs affect target proteins involved in disease at the cellular
level and novel therapies should be directed at this level.

  THE EMERGING FIELD OF CELLOMICS

     We define cellomics as the study of all the molecules comprising a cell, as
well as their interactions in space and over time, that bring about cellular
functions. The cellome is the complete collection of an organism's cells and
cellular components, including genes and proteins. Unlike genomics and
proteomics, cellomics seeks to develop a complete description of all the
characteristics, actions and interactions of cellular components. We believe
that more fully understanding cellular function through cellomics will enable
the more efficient, productive and cost-effective discovery and development of
novel drugs and therapies, and improve the diagnosis and management of disease.
We believe that the introduction of automated cell analysis instruments and
searchable cellular databases may lead to the creation of the field of
cellomics. The following diagram illustrates the cell as a functional machine
which includes a number of components that are responsible for performing
cellular functions:

                           THE GENE-TO-CELL CONTINUUM
[GRAPHIC SHOWING HOW DNA, RNA AND PROTEINS ARE PART OF THE CELLULAR FUNCTIONAL
MACHINE]

  THE CURRENT DRUG DISCOVERY PROCESS AND ITS LIMITATIONS


     Growing research and development investments by the pharmaceutical and
biotechnology industries have historically fueled drug development. Drug
discovery and development is an expensive, time-consuming and risky process. The
Pharmaceutical Research and Manufacturing Association estimates that
pharmaceutical companies spent approximately $24 billion, or 20% of sales, in
research and development during 1999. This expenditure represented a 14.1%
increase from 1998. Of the potentially hundreds of thousands of compounds
screened in a drug discovery program, less than 1 in 1,000 will become new drug
candidates and only about 20% of these will complete human clinical trials and
receive regulatory approval. Only about 30% of drugs that are commercialized
ever recover their development costs. Pharmaceutical and biotechnology companies
have realized that, to stay competitive and meet their goals for growth, they
will have to significantly increase the number of new drugs introduced each
year. Because government agencies rigidly define and highly regulate the
pre-clinical and clinical trial phases of the development of new drugs,
companies can impose little control over the costs of these phases. As a result,
drug companies increasingly focus their efforts on the drug discovery stage to
enhance productivity and reduce costs.



     The following four steps comprise the drug discovery process: target
identification, target validation, primary screening and lead optimization.



     - Target identification characterizes the role a particular protein plays
       in cellular function in order to determine whether it might be a target
       for drug discovery. The dramatic increase in gene discovery,

                                       29
<PAGE>   32


largely due to the emergence of genomics technology, has alleviated the previous
bottleneck in drug discovery of target identification.


     - Target validation demonstrates that affecting the function of a
       particular target has a potential effect on the course of a disease.
       Traditional target validation depends primarily upon manual, benchtop
       biological research, which is expensive and slow. Target validation has
       not kept pace with increased productivity in target identification.


     - Primary screening tests a large collection of chemical compounds, or
       libraries, against validated targets to find "hits" or members of the
       library that affect the function of a particular target. During primary
       screening, hundreds of thousands of compounds may be screened for a
       single, simple measure of a target's biological activity. Over the last
       decade, some companies have introduced automated high throughput and
       ultra high throughput screening systems. These systems can perform over
       100,000 cellular analyses per day.



     - Lead optimization is the process of sorting through hits that emerge from
       primary screening to find compounds likely to have appropriate drug
       properties, including efficacy and low toxicity. Because of the improved
       efficiency in primary screening, lead optimization is now the major
       bottleneck in the drug discovery process. Traditionally, lead
       optimization utilizes manual, benchtop biological research that includes
       secondary screens, studies of the relationship between the structure and
       activity of compounds and cellular toxicity measurements. This slow and
       expensive process usually employs single measurements of biological
       activity without capturing both time and space data from cells. Time and
       space data, which we call high content data, is important to the
       understanding of complex cell functions. Without cellular analysis
       systems which provide high content data on cell functions, the
       pharmaceutical and biotechnology industries have historically been
       focused on a narrow range of targets, primarily the receptors on the
       surface of cells. However, cell functions involve not only the number and
       distribution of specific receptors localized on the surface of cells, but
       also the distribution and activity of other molecules on and within the
       cells. For example, the cycle of internalization of receptors to the
       inside of cells and back to the surface that regulates the responsiveness
       of many cells, involves numerous proteins in different locations within
       cells and exhibits different activities. The ability to measure the time
       and space activities of these proteins in relationship to specific cell
       functions, such as receptor-based stimulation, is an important challenge
       for lead optimization.



     Pharmaceutical and biotechnology companies strive to improve productivity
in all four steps of the drug discovery process. To date, substantial
improvements in the target identification and the primary screening steps have
occurred through significant investments in genomics and high throughput
screening technologies. We believe that the key to relieving the bottleneck at
the lead optimization step will be the development of products and technologies
that produce high content data, information and ultimately knowledge of cellular
functions. We also believe that the application of cellomics will make target
validation more efficient. In addition, we believe that the large amount of time
and space data that will be produced in high content, cell-based measurements
will require automation of the process from the level of instrumentation,
management and mining of data, to the identification of lead compounds based on
knowledge of the role of targets in cellular functions.


OUR SOLUTION

     We are pioneering an approach to the field of cellomics in an effort to
increase the productivity of the drug discovery process. We believe our products
will allow researchers to narrow the focus of their discovery effort to more
accurately identify and select compounds that have a higher chance of
successfully completing the drug development process. Our solution involves the
following elements:


     Create High Content Screening Technologies and Products. We have developed
a high content screening technology that consists of instrumentation,
fluorescent dyes and biological molecules that we call reagents, protocols, and
data and information management software. Together, this integrated approach
provides high content biological information about time, space and activity of
cells and cellular components, as it relates to a drug candidate's physiological
impact on specific cellular targets within, on and between cells. We are

                                       30
<PAGE>   33


designing our high content screening products to provide insights into the
potential efficacy and toxicity of a drug candidate on cells prior to initiating
expensive pre-clinical testing and human clinical trials, in order to enable
pharmaceutical companies to increase productivity. We believe that we are the
first company to develop and deliver high content screening products to the
pharmaceutical industry. We have developed a high content screen that measures
the internalization of specific receptors from the surface of the cell and
defines their dynamic re-distribution within the cell, including their return to
the cell surface. We believe our products and technologies will enable our
customers to define the specific role that proteins play in cell functions such
as receptor cycling. Furthermore, we believe our high content screening products
have broad applications across many segments of the life sciences industry.


     We believe the use of high content screening during lead optimization will
significantly enhance the process of further qualifying hits resulting from high
throughput screening. High throughput screening products for cell-based analysis
presently used in the primary screening step of drug discovery cannot produce
time and space activity information required for high content screening. Our
high content screening products directly measure the time and space activity of
fluorescently-labeled targets and other cellular components on, in and even
between cells.

     Automate High Content Screening. We designed our high content screening
products and technologies to automate the instrumentation, cellular analysis
tools and information management tools required to analyze cells. Just as the
proliferation of automated DNA sequencing instruments led to a dramatic increase
in the generation of vast amounts of genomic data and information, we believe
that automation of high content screening systems will lead to a dramatic
increase in cell-based data and information, thereby improving the productivity
of the drug discovery process. Until now, most cell analysis methods used manual
experimentation that did not keep pace with the automation of primary screening.
In addition, due to the large volume of data generated in high throughput
screening and high content screening, we believe it is essential to use an
automated system to identify the compounds that have the most desirable effects
on targets within cells. We designed our products to automatically link together
all of the results from the discovery process with the compounds, biological
targets and cellular processes that are part of the screen. We believe this
enables all of the higher level linkages to chemical informatics systems and
bioinformatics tools that will permit the creation of new knowledge.


     Access, Manage and Mine Data for Decision Support. We are developing
software tools and products to archive data from high content screens, perform
data analysis, manage large numbers of measurements in the total screening
process and perform data mining on large data sets. We believe the life sciences
industry's most pressing issues include the effective management and use of the
volume of data being generated. In addition, to fully exploit the potential of
our high content screening systems, researchers need innovative informatics
tools to manage, analyze and mine the large volume of data being generated. We
are designing our informatics products to provide an integrated informatics
solution. To this end, our product design will offer a user-friendly, web-based
environment built on top of industry standard database tools, together with data
and pattern analysis tools for easy data exchange. In addition, we design our
informatics products to take advantage of a web browser-based interface that
enables seamless access and integration of proprietary and public domain
databases, including genomics, proteomics and the Cellomics Knowledgebase. We
believe our informatics tools provide for the development of a more effective
understanding of the cell, and increasing productivity in the drug discovery
process.



     Create a Database which Leads to a Better Understanding of the Cellome. We
are developing a searchable database of the molecular components and their
interactions that occur in the cell. We are developing the Cellomics
Knowledgebase, our proprietary, web-based, searchable database of the
biochemical and molecular interactions that produce normal and abnormal cell
functions. Our Cellomics Knowledgebase will consist of a densely populated
database of public domain "prior knowledge" in cell biology, searchable using
our proprietary software, and proprietary knowledge generated from our high
content screening systems.


     We are working to create a digital virtual cell through the integration of
the Cellomics Knowledgebase with the continuum of our data-generating and
information-extracting products. We believe the Cellomics Knowledgebase can
become a powerful predictive tool to permit better decisions on what targets to
screen,

                                       31
<PAGE>   34

what cell functions to measure and what types of chemical compounds to screen,
as well as define potentially new cellular pathways.

STRATEGY


     Our mission is to be a leader in the field of cellomics in order to extend
the power of genomics and proteomics by defining the cellular functions of genes
and proteins. Our strategy involves developing and commercializing products
designed to make life sciences research, including drug discovery, more
productive and cost-effective. Key elements of our strategy follow:


     Establish High Content Screening as the Standard for Drug Discovery.  We
currently market our high content screening systems primarily to the
pharmaceutical and biotechnology industries. Our strategy is to make high
content screening an important tool for drug discovery by penetrating
pharmaceutical, biotechnology and other research laboratories engaged in drug
discovery. We have designed our instruments, cellular analysis products and
informatics products to meet the immediate needs and current standards of this
market segment. We believe this segment provides the most immediate opportunity
due to the large investment in research and development and the need to improve
the productivity of drug discovery.


     Broaden Our Cellular Analysis Products Menu. We are developing a series of
new classes of the consumable reagents and software tools used in high content
screening. The consumable reagents consist of a combination of fluorescent dyes
that specifically bond to cellular components and biological molecules that have
fluorescent dyes attached by a variety of methods. We sell these consumable
reagents in kits called reagent kits. These molecules permit the proteins and
other cellular components to be detected and measured by the screening
instrumentation. We design software tools for the different types of cellular
analysis. Each major cellular process will require a new class of cellular
analysis products including its own software tool and will utilize multiple
reagent kits. For example, the receptor internalization class of cellular
analysis products includes many different types of receptors, each requiring
their own kit. We believe there are dozens of classes of cellular analysis
products each requiring multiple reagent kits that have the potential to
generate follow-on sales.



     Expand into New Market Segments. We intend to use our proprietary cellular
analysis products to expand high content screening into multiple markets. These
markets include target validation in drug discovery, basic biomedical research,
clinical diagnostics and agriculture. We also intend to use our high content
screening products to study the physiological impact of drugs on cells
collected, or derived, from humans with individual genetic make-ups. In
addition, we believe this approach, which we call PharmacoCellomics Profiling,
will allow for pre-testing the response of a patient's cells to an accepted
protocol or drug candidate, and better focus clinical trials on the optimal
population of patients.



     Migrate to the CellChip System. We are currently developing the CellChip
System. We believe the CellChip System is a revolutionary approach,
incorporating the precision of high content screening into a miniaturized, more
versatile product. We are designing the CellChip System to increase the
productivity of the drug discovery process by combining high throughput
screening and high content screening into the same miniaturized format. We
believe that our CellChip System will permit pre-packaged, complex cellular
analysis to be performed simply, quickly and at less cost per measurement than
presently performed using test plates and will accelerate the use of cell-based
measurements in all fields of life sciences.


     Create the Leading Searchable Repository of Cellomics Knowledge.  We are
striving to create the leading searchable repository of knowledge of the cellome
by populating our Cellomics Knowledgebase with high content screening
information and information obtained from the public domain. We intend to
continually edit and refine our Cellomics Knowledgebase through reviews by a
panel of scientists in the field of cell biology. We believe our Cellomics
Knowledgebase may add significant value to researchers' understanding of the
cellome, thereby increasing the productivity of the drug discovery process. We
intend to commercialize the Cellomics Knowledgebase through the sale of
subscriptions.

     Combine Our Strengths with the Strengths of Strategic Corporate
Partners. We intend to continue to enter into strategic partnerships to combine
our core expertise in cell and molecular biology, imaging science,

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<PAGE>   35


information management software, cellular bioinformatics and cell patterning,
with the strengths of corporate partners. Through these collaborations, we
intend to access complementary technologies and strengthen our commercialization
capabilities. We believe that strategic relationships with partners who have
strong, existing market positions and development track records will speed
market introduction, maintain high barriers to entry and reduce our research and
development risk and capital outlay. For example, we have established a
strategic relationship with Zeiss relating to our ArrayScan products and Zeiss'
Ultra High Throughput Screening System and with Beckman Coulter relating to
marketing various of our products and automation for our CellChip System. In
addition, we have entered into a collaboration with ACLARA to incorporate their
technologies for the control of very small fluid volumes into our CellChip
System. We also have exclusively licensed some key fluorescence technologies
from Molecular Probes to incorporate into our reagent kits for the high content
screening market.


OUR PRODUCTS


     Our products initially target a market segment consisting of approximately
140 pharmaceutical companies which are involved in discovery research and
development. The pharmaceutical industry spent approximately $24 billion in
research and development in 1999. Within this initial market segment we are
focusing on screening and toxicology where the pharmaceutical industry spent
approximately $1.5 billion in 1999 and information management and bioinformatics
tools where the pharmaceutical industry spent approximately $800 million in
1999. We believe our products have potential application in other life sciences
markets. Our products are designed to seamlessly integrate the generation of
data to the extraction of information, and ultimately create cellular knowledge.
We generate cellular data using our proprietary instruments and cellular
analysis products, including software tools and reagent kits. Our proprietary
informatics products then store, manage, analyze and mine the cellular data
generated. We are designing our cellular bioinformatics products, coupled with
internally and externally generated information, to build a virtual cell which
maps the complex network of cellular components and their interactions. Our
knowledge products aim to systematize, in a searchable, electronic format, our
continuously evolving understanding of cellular biology. Our existing products
and our products in development are highlighted on the following page.


  HIGH CONTENT SCREENING PRODUCTS TO GENERATE DATA


     ArrayScan II. The ArrayScan II is an automated, high content screening
instrument comprised of optics, automation hardware and software that scans
standard test plates and analyzes fields of cells based on multi-color
fluorescence imaging. Our ArrayScan II analyzes drug candidate interactions
within, on and between cells with multi-color fluorescence measurements taken at
a single point in time. The system contains test plate scanning hardware, using
fluorescence, a solid state camera, a Pentium-based PC with powerful software to
perform cellular analyses, a plate stacker for automated screens and database
management capabilities. The system can control the temperature, humidity and
other environmental parameters for simple live cell experimental analysis. We
offer a number of versions of the ArrayScan II which have different software
tools for various levels of analysis.



     ArrayScan Kinetics Workstation. We are developing our ArrayScan Kinetics
Workstation to allow researchers to perform complete, automated high content
screening on multiple plates of living cells. A working version of our ArrayScan
Kinetics Workstation is in pre-product testing. The ArrayScan Kinetics
Workstation is designed to operate under controlled growth conditions with
random access compound delivery where time, or kinetic, information is critical.
Random access compound delivery enables researchers to test the effects of drug
candidates in cells at multiple points in time and under various growth
conditions to assess interaction between drugs and cells or cell components,
which may be useful in understanding toxicity and efficacy. This proprietary
workstation includes many of the features of the ArrayScan II, as well as an
advanced plate reader, 30-plate incubator stacker, on-board fluid addition,
compound storage, and automatic plate handling. Zeiss manufactures our ArrayScan
Kinetics Workstation to our specifications under the terms of our collaboration.
The ArrayScan Kinetics Workstation is designed to operate as a standalone
screening workstation or in connection with Zeiss' Ultra High Throughput
Screening System.


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<PAGE>   36

                    OUR PRODUCTS AND PRODUCTS IN DEVELOPMENT
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
   PRODUCT CATEGORIES               PRODUCT                          DESCRIPTION                  STATUS(1)
------------------------  ----------------------------  --------------------------------------  --------------
<S>                       <C>                           <C>                                     <C>
HIGH CONTENT SCREENING    ArrayScan II                  Automated, high content screening       Commercialized
PRODUCTS TO GENERATE                                    instrument and software for single
DATA                                                    point-in- time cellular analysis
                          ArrayScan Kinetics            Automated, fully integrated high        In development
                          Workstation                   content screening system with reader,   (Pre-product
                                                        fluid addition station, and             testing)
                                                        environmental control for multiple
                                                        point-in-time analyses
                          ArrayScan Kinetics Reader     Automated high content screening        In development
                                                        instrument and software designed for    (Pre-product
                                                        use with existing high throughput       testing)
                                                        screening automation systems, to allow
                                                        them to perform multiple point-in-time
                                                        analyses
                          Software Tools and HitKit     Software tools and reagent kits         Commercialized
                          Reagents                      optimized for high content screening    15 kits;
                                                        on our ArrayScan systems                others in
                                                                                                development
                          Custom Cellular Analysis      Cellular analysis development services  Commercialized
                          Development                   for customers
                          CellChip System               Miniaturized cell analysis utilizing    In development
                                                        small volume fluid control technology   (Proof of
                                                        in collaboration with ACLARA            concept of
                                                                                                whole system;
                                                                                                Prototype of
                                                                                                microscopic
                                                                                                cell grids and
                                                                                                fluid control
                                                                                                technologies)

INFORMATICS PRODUCTS TO   Cellomics Store               Data management software for managing,  Commercialized
EXTRACT INFORMATION                                     archiving and viewing massive volumes
                                                        of cell data
                          Cellomics Screen              Process management and data analysis    In development
                                                        software intended to allow hits and     (Pre-product
                                                        leads to be easily identified and       testing)
                                                        verified
                          Cellomics Discover            Data visualization and mining software  In development
                                                        incorporating a web browser-based       (Prototype
                                                        interface to examine data in Cellomics  products)
                                                        Screen and Cellomics Store, as well as
                                                        retrieve data from both proprietary
                                                        and public databases

CELLULAR BIOINFORMATICS   Cellomics Knowledgebase       Web-based, searchable database of       In development
PRODUCTS TO CREATE                                      cellular biochemical and molecular      (Proof of
KNOWLEDGE                                               interactions designed to create a       concept)
                                                        digital virtual cell
                          PharmacoCellomics Profiling   Searchable database that contains       In development
                                                        individual patient's cell responses to  (Proof of
                                                        lead compounds and complements          concept)
                                                        genomics to personalize drug discovery
</TABLE>


(1) Products in development are defined in four stages: (a) the planning
    stage -- where concept of product is defined; (b) proof of concept -- which
    involves testing components of prototypes successfully; (c) prototype
    products -- partially functional system tested against performance
    specifications and; (d) pre-product testing -- the testing of pre-product to
    finalize performance specifications before commercialization.

                                       34
<PAGE>   37

     ArrayScan Kinetics Reader. We have designed our ArrayScan Kinetics Reader
to allow researchers to integrate our high content screening system into the
existing installed base of high throughput screening systems. We have working
prototypes of our ArrayScan Kinetics Reader that are undergoing pre-product
testing. Our ArrayScan Kinetics Reader includes proprietary optics, hardware,
environmental controls and software that have been optimized for kinetic
measurements. As part of our collaboration with Zeiss, Zeiss manufactures our
ArrayScan Kinetics Reader according to our specifications.


     Software Tools and HitKit Reagents. We have a growing list of proprietary
classes of cellular analysis products, including software tools and reagent kits
optimized for our ArrayScan systems. We presently have commercialized 15 reagent
kits. We design our cellular analysis products for use in monitoring drug
effects in a variety of diseases such as cancer, diabetes and infectious
disease, as well as for toxicity testing at the cellular level. The process of
developing a new cellular analysis product includes the selection of cell types,
targets, fluorescence-based reagents, protocols and software programs. The
complete kit incorporates the necessary reagents and protocols to run the
analysis. We are developing new Software tools for the new classes of cellular
analysis products being developed. We anticipate selling the Software tools as
software plug-ins to our ArrayScan systems.



     Our reagent kits, which we call HitKits, include combinations of cells,
multi-color fluorescence-based reagents and other consumables such as validated
test plates, in order to understand a drug candidate's effect on a cell. We
designed our first commercialized HitKits to measure transcription factor
activation, cell viability, receptor internalization, apoptosis, or cell death,
and cytotoxicity, or the toxic effect on cells. We are expanding our
commercialized list of cellular analysis products.


     Custom Cellular Analysis Development. We provide screen development
services on a contractual basis to support customers in the design, development
and implementation of high content screening cellular analysis tools that are
not already offered as finished HitKits and software tools. We offer custom
cellular analysis tools through screen development support services, including
the development of specific fluorescence-based reagents, software tools for
analysis, and sample preparation and screening protocols.


     CellChip System. We are developing our CellChip System as a miniaturized,
next-generation product for combining high content screening and high throughput
screening. Our CellChip System combines the organization of specific cells in
very small grids of cells, with technologies which control very small fluid
volumes. We believe our CellChip System will represent a significant advance
over the industry standard test plates. We are collaborating with ACLARA to
develop our CellChip System by incorporating their small volume fluid control
technologies. Our CellChip System utilizes small wafers of glass or plastic that
are patterned with chemical and molecular domains which organize specific cells
in microscopic grids. We are designing our CellChip System to permit more rapid,
sophisticated and cost-effective cell analyses than presently permitted by the
current test plate format.


  INFORMATICS PRODUCTS TO EXTRACT INFORMATION

     Cellomics Store. We currently market Cellomics Store, a software package
that manages and archives the large volume of cell data and images that can be
generated during screening. Cellomics Store allows for the visualization of
biologically rich data generated from our ArrayScan instrument line, as well as
existing high throughput screening instruments.

     Cellomics Screen. We are developing Cellomics Screen, a software package
designed to manage the screening process and data analysis. Cellomics Screen
analyzes screening runs, allowing hits and leads to be easily identified and
verified. We are currently in pre-product testing of this product.


     Cellomics Discover. We are developing Cellomics Discover, a software
package that includes a web browser-based interface. We have designed Cellomics
Discover to provide data visualization and mining capabilities, and information
retrieval from both proprietary and public databases. We have also designed
Cellomics Discover to examine data in Cellomics Screen and Cellomics Store.
Cellomics Discover will also automate quality assessment of screening data, and
correlate high content screening and high throughput


                                       35
<PAGE>   38

screening data with data from other databases such as genomics, proteomics and
our Cellomics Knowledgebase. We are currently working with a prototype product.

  CELLULAR BIOINFORMATICS PRODUCTS TO CREATE KNOWLEDGE


     Cellomics Knowledgebase. We are developing our Cellomics Knowledgebase as a
web browser-based product designed to facilitate the discovery of cellular
knowledge about new targets, the interaction of targets within cellular pathways
and cellular functions. We believe our Cellomics Knowledgebase will be for the
cell, what searchable genomics databases have been with respect to the discovery
of new genes from DNA sequences. The core of the Cellomics Knowledgebase will
consist of a biochemical and molecular wiring diagram of cells, which is the
complex, interactive network of cellular components. We believe queries of the
Cellomics Knowledgebase will allow new knowledge to be discovered concerning
molecular interactions, pathway connections, cell functions and relationships
among cell components across cell types and species. We are developing our
virtual cell visualization tool to display the complex results of queries. In
addition, we believe that proprietary databases derived from the Cellomics
Knowledgebase could contain profiling information on the impact of classes of
compounds on targets, pathways, cell functions and cytotoxicity. We also intend
the Cellomics Knowledgebase to integrate information from genomics, proteomics
and gene expression profiles. We are designing the first volume of the Cellomics
Knowledgebase to organize around human cell types, but be expandable and
searchable across species, cell functions, cell pathways and specific proteins
and other cellular components. The design of the Cellomics Knowledgebase should
systematize, in a searchable, electronic format, our continuously evolving
understanding of cellular biology, encompassing not only cellular components,
but also their complex interactions and interdependencies.



     PharmacoCellomics Profiling. We are developing a searchable database that
will combine our high content screening products, informatics software and
Cellomics Knowledgebase, to create an integrated system capable of profiling
cells of specific patients. PharmacoCellomics complements genomics profiling,
which is the profiling of the human population to define genetic subsets of the
population that would be likely candidates for specific drugs. Our
PharmacoCellomics product will contain an individual patient's cell responses to
lead compounds, which we believe will significantly increase the potential of
personalizing drug discovery. We are initially exploring cancer, where high
content screening can access and use patient tumor cells to define the effect of
experimental compounds.


PRODUCTS WE MARKET FOR ZEISS


     As part of our strategic relationship with Zeiss, we have entered into an
agreement to sell and market their Ultra High Throughput Screening System in
North America. Zeiss' Ultra High Throughput Screening System is a fully
automated product capable of screening over 100,000 compounds per day in the
primary screening step of drug discovery. The system optimizes all process steps
using advanced technologies for optical detection and automation to achieve high
speed, flexibility and reliability. The system is modular and can be rapidly
reconfigured for distinct types of screens. Our ArrayScan Kinetics Workstation
could be directly coupled to Zeiss' system to shorten the drug discovery process
by running primary cell-based screens and lead optimization screens in series.


SALES AND MARKETING


     We sell our products to pharmaceutical and biotechnology companies. We
believe our products are applicable to a broader range of life sciences markets.
We sell our products in North America and Europe through a direct sales force
experienced in selling capital equipment, reagents and development contracts to
the pharmaceutical, biotechnology and other life sciences markets. Our executive
business development team and a scientific and applications support staff
support the pre-sale and post-sale processes. In addition, we sell access to our
future products through technology access programs. We provide our customers
with a standard one year replacement warranty on our products. Our standard
payment terms for our products are 30 days from date of shipment.


                                       36
<PAGE>   39


     In addition to our own products, we provide exclusive marketing, sales,
service and support for Zeiss' Ultra High Throughput Screening System in North
America. Under this agreement, Zeiss ships directly its Ultra High Throughput
Screening System to our customers in North America thereby limiting the amount
of inventory we require. Zeiss also provides standard industry warranties of one
year to replace parts. Our standard payment terms are 30 days from date of
shipment.


     We identify potential customers through a comprehensive marketing program,
coupled with personal lead development by our field sales force, executive
management and scientists, as well as our scientific advisors. Led by an
experienced marketing and product management staff, our marketing program
includes direct mail programs, advertisements in market-specific journals,
production of detailed product and technology literature, trade show exhibits,
speaking engagements at scientific meetings, seminars, public relations and
internet-based website marketing.


     In June 2000, we formed a strategic relationship with Beckman Coulter which
includes a distribution agreement for some of our products. We describe this
relationship including the distribution agreement under "Corporate
Collaborations and Technology Access Programs" below.


CORPORATE COLLABORATIONS AND TECHNOLOGY ACCESS PROGRAMS


     We rely on Zeiss for optical components for our ArrayScan II and on
Molecular Probes for reagent supplies that are used in our cellular analysis
kits. We expect to rely on Beckman Coulter for marketing some of our products
and to assist us in the development of our CellChip System. We also expect to
rely on ACLARA for some of the technologies to be used in our CellChip System.



     Carl Zeiss Jena, GmbH. In April 1998, we formed a collaboration with Zeiss,
one of our early stockholders, relating to developing, manufacturing and
supplying the ArrayScan Kinetics Reader and the ArrayScan Kinetics Workstation.
In February 2000, we entered into two new agreements with Zeiss that amend and
restate our 1998 agreement. These agreements are a development, manufacturing
and supply agreement and a sales and marketing agreement.



     Under the new development, manufacturing and supply agreement, Zeiss
exclusively manufactures our ArrayScan Kinetics Workstation and ArrayScan
Kinetics Reader. Under the terms of our agreement, Zeiss will manufacture these
products to our specifications. The arrangement also provides that both we and
Zeiss cooperatively develop software interfaces designed to make Zeiss' Ultra
High Throughput Screening System compatible with our data analysis and
management software. Under the terms of the agreement, we market, sell and
service these products. The term of the overall agreement sets forth the prices
we will pay Zeiss for products they manufacture subject to renegotiation every
two years. Under the agreement, we own all intellectual property of components
specifically developed and manufactured for the ArrayScan products. Zeiss has
agreed not to use or incorporate this technology into competing products. The
initial exclusive supply period extends through September 2002 and can be
renewed for one additional year by mutual agreement. Under the terms of the
agreement, to maintain exclusivity, we must purchase a minimum of $3.8 million
in products from Zeiss by September 2001. The agreement expires in January 2005,
subject to early termination by either party after January 2002. In connection
with entering into the February 2000 agreement, we agreed to reimburse Zeiss for
$2.0 million development costs incurred through December 1999. We have agreed to
pay Zeiss the development costs under the terms of the February 2000 agreement
during 2000 and 2001 in equal installments of $1.0 million. In addition, the
increase in our research and development expenses for the year ended December
31, 1999 from $3.9 million in 1998 to $9.5 million primarily resulted from
increased costs associated with the development of prototype instrument products
under this agreement.



     Under the terms of our sales and marketing agreement with Zeiss, we
exclusively sell and market Zeiss' Ultra High Throughput Screening System and
related products in North America. We also provide, at our expense, shipping,
installation and other support activities for products sold in North America.
During the term of the agreement, we may not sell in North America any products
that compete with Zeiss' Ultra High Throughput Screening System or other related
products developed by Zeiss. In the event that we do not comply with this
provision of the agreement, Zeiss may terminate our exclusivity immediately.
Under the

                                       37
<PAGE>   40

terms of the agreement, we have agreed to purchase a minimum number of Zeiss
products pursuant to the terms of the agreement. If we do not fulfill our
requirements specified in the agreement, Zeiss has the right to either terminate
our exclusivity or terminate the agreement in its entirety. We are free, under
the terms of the agreement, to sell the Zeiss products in North America at a
sales price we establish. We will retain all revenues from our sales of Zeiss'
products in North America. The agreement expires in December 2005; however,
either party may terminate the agreement on the occurrence of material breach by
the other party or if the other party comes under control of a competitor of the
terminating party.


     Beckman Coulter. In June 2000, we entered into a strategic relationship
agreement with Beckman Coulter. We appointed Beckman Coulter as our commission
sales representative for North America and a number of countries in Europe to
sell our ArrayScan II high content screening product and our Cellomics Store
informatics product. They will be our sales representative in these territories
for our Cellomics Screen informatics product upon completion of its development.
They will become our exclusive distributor for these products as well as for our
ArrayScan Kinetics Reader upon completion of its development and our certifying
that we can deliver it in commercial quantities. We also appointed Beckman
Coulter as our commission sales representative in North America and a number of
European countries primarily for large volume purchasers of our HitKit reagents
for high content screening. Beckman Coulter has the right to expand its
territory to include Japan. We are free to sell our other products that we are
developing such as our Knowledgebase bioinformatics product. To maintain
exclusivity, Beckman Coulter will have to have met sales objectives for the
first two years, and thereafter will have to meet sales objectives that we
negotiate with them in the future. We will provide marketing, training,
technical and customer assistance to Beckman Coulter and are responsible for
customer warranties for the first year. We have also granted Beckman Coulter a
right to fund and acquire the exclusive license for a future version of our
Cellomics Store and Cellomics Screen informatics products that we are developing
for high throughput screening in exchange for royalty payments. Apart from the
distribution arrangements, Beckman Coulter has agreed to provide automation
design for our CellChip product. If we complete development of our CellChip
product and, if at that point in time the parties have mutually agreed to
proceed forward and, if Beckman Coulter is the developer of the automation
portion of this product, Beckman Coulter shall manufacture the automation
portion and exclusively distribute the CellChip System and related informatics
products with the right to distribute (co-exclusively with us) CellChip
consumables in the fields of clinical research and in vitro diagnostics. We will
retain rights for the distribution of CellChip consumables in all markets.
Beckman Coulter can obtain a non-exclusive license to use our Knowledgebase
bioinformatics product which is under development. We intend to explore joint
programs with the potential of cross licensing key technologies upon terms to be
mutually agreed to by both parties for the fields of high content screening,
flow cytometry and of high throughput screening. We and Beckman Coulter will
also each contribute $1.0 million in funds, products or resources to
universities and nonprofit research institutes for cell research during the term
of the agreement. The strategic relationship agreement has a ten year term,
although Beckman Coulter has the right to terminate it with a 12 months' notice.
In the event of such notice, Beckman Coulter, under certain conditions, cannot
manufacture, sell, distribute or service products that compete with our products
which they distributed, and we cannot manufacture, sell distribute or service
products that compete with specified Beckman Coulter products for a defined
period of time. Under a separate agreement, Beckman Coulter purchased $4.8
million of our common stock.



     ACLARA Biosciences, Inc. In October 1999, we entered into an exclusive
collaboration with ACLARA for the development of our CellChip System utilizing
our cell patterning technologies and ACLARA's proprietary technology for
controlling very small volumes of fluids. Each of us owns all intellectual
property in which we had the sole role in inventing, and will jointly own all
intellectual property which was co-invented by both of us. During the term of
the agreement, we may not seek another partner for small volume fluid control
technologies, and ACLARA may not partner with another entity for technology to
organize specific cells into very small grids using its small volume fluid
control technologies. We have established proprietary development budgets with
ACLARA for the first year of the agreement and have agreed to develop budgets
for succeeding years in good faith. In the event that we receive revenues from
early access programs or commercialization of our products, we will enter into
good-faith negotiations to determine division of those revenues. ACLARA has
agreed to enter into a supply agreement with us upon

                                       38
<PAGE>   41


commercialization of the CellChip System. Either party may terminate this
agreement on the material breach of the other party. Under some circumstances,
licenses that were granted between the parties during the term of the agreement
may survive any termination of the agreement. Further, each party has the right
to license from the other party additional technology related to the CellChip if
requested within two years of termination.



     Molecular Probes, Inc. In April 1999, we entered into a license and supply
agreement with Molecular Probes under which it licensed to us select proprietary
fluorescence-based reagents on an exclusive worldwide basis for use in high
content screening. We also obtained a non-exclusive worldwide license to sell
these proprietary fluorescence-based reagents for use in ultra high throughput
screening. Under the terms of the agreement, we must meet certain conditions to
maintain exclusivity. We will also purchase all of our requirements for
particular fluorescence-based reagents for use in high content screening and
ultra high throughput screening from Molecular Probes, unless Molecular Probes
is unable to meet our requirements. We paid Molecular Probes an up-front license
fee and agreed to pay continuing royalties based on specified annual sales
revenues.


     Pharmaceutical Company Collaborations. We enter into technology access
programs through which we give customers early access to our new products, along
with technical support, training and individualized services. Through our
technology access programs, we collaborate with our customers during the product
development process in order to create products that closely meet the needs of
the market. Our technology access programs assist us in focusing our technology
and development efforts on areas that we believe will have the most impact on
the market. To date, Johnson & Johnson, Merck and Warner-Lambert have
participated in our technology access programs. Typically, for the term of a
technology access agreement, our customers will have non-exclusive or
limited-time exclusive access to particular products in development.


     We have received approximately $1.8 million to date and expect to receive
an additional $300,000 from the collaborators above related to the achievement
of milestones, research and development funding and license fees. We have also
paid approximately $244,000 to date and we are committed to pay approximately
$3.6 million to the collaborators above relating to capital expenditures, the
achievement of milestones, research and development funding and license fees.


MANUFACTURING

     We currently maintain a manufacturing facility for instrumentation,
software products, and reagent kit production. Our manufacturing of the
ArrayScan II predominantly involves a final assembly and testing activity using
commercially available optical, mechanical and computer components combined with
custom mounting assemblies and proprietary software. The ArrayScan Kinetics
Workstation and ArrayScan Kinetics Reader manufacturing will involve software
integration and testing of the electromechanical and optical system manufactured
for us by Zeiss. We manufacture HitKits in our facility with a combination of
our proprietary reagents and those we have exclusively licensed from Molecular
Probes. We dispense, finish and test our products on site using our processes
and to our specifications. Similarly, we manufacture our informatics and
bioinformatics software products using industry standard procedures.

COMPETITION


     Rapidly evolving technology and intense competition characterize the
biotechnology and pharmaceutical industries. Currently, we compete with many
companies, including major pharmaceutical, chemical and biotechnology companies
that perform drug discovery and development and related tasks using alternative
technologies. We have begun to encounter competition from companies which offer
one or more components of high content screening, including integrated reagents,
kits, applications, instrumentation and informatics. We expect to encounter
intense competition from companies providing conventional drug discovery and
development products based on established technologies and companies developing
their own cellular analysis technologies.


     In order to compete against vendors of conventional products, we will need
to demonstrate the advantages of our products and technologies over
well-established alternative products and technologies.
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<PAGE>   42


Moreover, we will need to demonstrate the potential economic value of our
products relative to these conventional technologies and products. We will also
need to compete effectively with companies developing their own cellular
analysis technologies and products. Our future success will depend in large part
on our ability to establish and maintain a competitive position in these and
future technologies which we may not be able to do. Rapid technological
development may render our products or technologies obsolete. Less expensive or
more effective products of our competitors based on similar or other
technologies could also render our products obsolete.


     Many of our competitors have or will have greater corporate, financial,
operational, sales and marketing resources, and more experience in research and
development than we have. Moreover, competitors may have greater name
recognition than we do, and may offer discounts as a competitive tactic. We
cannot assure you that our competitors will not succeed in developing or
marketing technologies or products that are more effective or commercially
attractive than our products or that would render our technologies and products
obsolete. Also, we may not have the financial resources, technical expertise or
marketing, distribution or support capabilities to compete successfully in the
future. Our success will depend in large part on our ability to maintain a
competitive position with our technologies.

     Our competitive position also depends on our ability to:

     - attract and retain qualified personnel;

     - obtain patent protection or otherwise develop proprietary products or
       processes;

     - discover new technologies that improve the productivity of the drug
       discovery process; and

     - secure sufficient capital resources to complete product development and
       commercialization processes.

INTELLECTUAL PROPERTY RIGHTS


     We seek patent protection on cell-based screening analysis tools and kits,
cell array technologies, reagents, instrumentation, informatics technologies and
bioinformatics. We currently own two issued U.S. patent and have over 40 U.S.
patent applications pending, of which over 15 are provisional patent
applications. In addition, we have patents pending in other countries and
jurisdictions.



     We direct our patents and applications at various technological areas which
we believe are valuable to our business, including:


     - a wide variety of cell screening analysis tools;

     - fluorescence-based reagents for cell screening;


     - cell grids;


     - devices for the control of small fluid volumes;

     - informatics software;

     - bioinformatics software; and

     - cell screening instrumentation, devices, and operating software.


     We hold one exclusive license covering 14 issued U.S. patents for
fluorescence-based reagents for high content screening, as well as two
non-exclusive licenses for such reagents.



     We also rely upon trade secrets, know-how, trademarks, copyright
protection, and continuing technological and licensing opportunities to develop
and maintain our competitive position. We require our employees, consultants,
and outside scientific collaborators to execute confidentiality agreements upon
commencing employment or consulting relationships with us. In the case of
employees, the agreement provides that all inventions they conceive during
employment will be our exclusive property.



     Patents may provide some degree of protection for our intellectual
property. However, patent protection involves complex legal and factual
determinations and is therefore uncertain. In addition, the laws governing

                                       40
<PAGE>   43


patentability and the scope of patent coverage continue to evolve, particularly
in the areas of technology of interest to us. As a result, we cannot assure you
that patents will issue from any of our patent applications or from applications
licensed to us. The scope of any of our issued patents may not be sufficiently
broad to offer meaningful protection. In addition, our issued patent or patents
licensed to us may be successfully challenged, invalidated, circumvented or
unenforceable so that our patent rights would not create an effective
competitive barrier. Moreover, the laws of some foreign countries may not
protect our proprietary rights to the same extents as do the laws of the United
States. In view of these factors, our intellectual property positions bear some
degree of uncertainty.


     Although we are not currently a party to any legal proceedings relating to
our intellectual property, in the future, third parties may file claims
asserting that our technologies or products infringe on their intellectual
property. We cannot predict whether third parties will assert such claims
against us or against the licensors of technology licensed to us, or whether
those claims will harm our business. If we are forced to defend against such
claims, whether they are with or without any merit, whether they are resolved in
favor of or against us or our licensors, we may face costly litigation and
diversion of management's attention and resources. As a result of such disputes,
we may have to develop costly non-infringing technology, or enter into licensing
agreements. These agreements, if necessary, may be unavailable on terms
acceptable to us, if at all, which could seriously harm our business or
financial condition.

EMPLOYEES


     As of August 31, 2000 we had 122 full-time employees, 21 in sales and
marketing, 34 in informatics/ bioinformatics, 39 in cellular analysis tools/kit
development/manufacturing, 16 in research and development and 12 in
administration. We have no collective bargaining agreements. We have not
experienced any work stoppage. We consider our relations with our employees to
be good.


SCIENTIFIC ADVISORY BOARD


     An important component of our scientific strategy is to establish
collaborative relationships with researchers in our fields of interest. Our
scientific advisors attend periodic meetings of our Scientific Advisory Board.
We do not employ any of our scientific advisors, and they may have commitments
to or consulting or advisory agreements with other entities that may limit their
availability to us. These companies may also compete with us. In general, our
scientific advisors hold stock options, own our stock and/or receive financial
remuneration for their services. The following are the members of our scientific
advisory board:


     Alan S. Waggoner, Ph.D. is the Director, Science and Technology Center at
Carnegie Mellon University. He is a founder of Cellomics.

     Harold Craighead, Ph.D. is Director of the Nanobiotechnology Center and a
Professor of Applied and Engineering Physics at Cornell University where he also
served as Director of the National Nanofabrication Facility from 1989 to 1995.

     Richard Haugland, Ph.D. is the founder and since 1975 has been the
President of Molecular Probes, Inc.

     Susan Henry, Ph.D. has been the Dean-Mellon College of Science of Carnegie
Mellon University since 1991 and is also a Professor-Department of Biological
Sciences, at Carnegie Mellon University since 1987.

     Takeo Kanade, Ph.D. is a computer scientist/electrical engineer, a member
of the National Academy of Sciences, and the Director of the Robotics Institute
at Carnegie Mellon University.

     John S. Lazo, Ph.D. is a Professor and Chairman of Pharmacology at the
University of Pittsburgh School of Medicine. He is also Co-Director of the
Experimental Therapeutics Program at the Pittsburgh Cancer Institute and
Visiting Scientist, Imperial Cancer Research Fund, University of Oxford, Oxford,
U.K.

     Milan Mrksich, Ph.D. is Assistant Professor of Chemistry at the University
of Chicago.

     Franklyn Prendergast, MD, Ph.D. is the Edmond and Marion Guggenheim
Professor of Biochemistry and Molecular Biology and Director of the Mayo Clinic
Cancer Center where he has also served as the

                                       41
<PAGE>   44

Chairman of the Biochemistry Department and a member of the Board of Governors
of the Mayo Clinic and Foundation.

     Felix de la Iglesia, MD is the Vice President, Pathology and Experimental
Toxicology, at Warner Lambert/Parke-Davis Pharmaceutical Research since 1983.

     George N. Pavlakis, MD, Ph.D. is the Head of the Human Retrovirus Section
at the National Cancer Institute.

FACILITIES


     We lease approximately 41,000 square feet of leased space in Pittsburgh,
Pennsylvania for our research and development, manufacturing and administrative
facilities. Our leases initially expire in April and June 2001. We believe that
our current facilities are adequate to meet our immediate needs. We will require
additional space as we expand our research and development activities and
production capabilities. We do not anticipate any significant difficulties in
obtaining additional facilities, as necessary.


LEGAL PROCEEDINGS

     We are not currently party to any legal proceedings. However, we may from
time to time become a party to various legal proceedings arising in the ordinary
course of our business.

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<PAGE>   45

                                   MANAGEMENT

DIRECTORS AND EXECUTIVE OFFICERS


     Our directors and executive officers, their ages and positions as of August
31, 2000 are as follows:



<TABLE>
<CAPTION>
NAME                                                 AGE    POSITION
----                                                 ---    --------
<S>                                                  <C>    <C>
D. Lansing Taylor, Ph.D. ..........................  53     President and Chief Executive Officer, Director
R. Terry Dunlay....................................  42     Executive Vice President and Chief Information Officer
L. Robert Johnston, Jr. ...........................  40     Vice President and Chief Financial Officer
Michael A. Nemzek..................................  40     Chief Business Officer
Alan W. Seadler, Ph.D. ............................  51     Chief Operating Officer
William Busa, Ph.D. ...............................  48     Chief Scientific Officer
Jeff W. Paslay, Ph.D. .............................  54     Senior Vice President, Pharmaceutical Technology
Albert H. Gough, Ph.D. ............................  47     Vice President, Research and Development
John M. Boles......................................  63     Chairman of the Board and Director
Alan Mendelson.....................................  52     Director
Arnold L. Oronsky, Ph.D. ..........................  59     Director
Barclay Phillips...................................  38     Director
James A. Sharp.....................................  45     Director
</TABLE>


     D. Lansing Taylor, Ph.D. has served as our President and Chief Executive
Officer since October 1996. Dr. Taylor is a founder of Cellomics. Dr. Taylor was
a Professor of Biological Sciences and Vice-Dean of the Division of Molecular
Sciences at Carnegie Mellon University from 1982 to 1998. He was also the
Director of the Center for Fluorescence Research and Director of the National
Science Foundation Center for Light Microscope Imaging and Biotechnology. Dr.
Taylor co-founded Biological Detection Systems, Inc., a reagents and instruments
company, in 1990 where he served as a director and a consultant. Prior to
Carnegie Mellon University, Dr. Taylor was a Professor of Biology at Harvard
University, where he pioneered fluorescence ratio imaging techniques. Dr. Taylor
received his B.S. degree in Zoology from the University of Maryland and his
Ph.D. in Cell Biology from the State University of New York, Albany.

     R. Terry Dunlay has served as our Executive Vice President and Chief
Information Officer since February 2000. From October 1996 to February 2000, he
served as our Executive Vice President. Mr. Dunlay is a founder of Cellomics.
Mr. Dunlay held various positions, including President and Chief Executive
Officer at Biological Detection, Inc., a software company, from 1996 to 1997 and
Vice President of Engineering/ Director of Engineering at Biological Detection
Systems, Inc., a reagents and instrumentation company, from 1992 to 1996. Mr.
Dunlay received his B.S. degree in Electrical Engineering from the University of
Pittsburgh and his M.S. degree in Electrical Engineering from Arizona State
University.

     L. Robert Johnston, Jr. has served as our Vice President and Chief
Financial Officer since November 1998. Prior to joining our company, Mr.
Johnston was Senior Vice President, Finance and Chief Financial Officer at
Oncormed, Inc., a cancer genetics biotech company, from 1994 to 1998. Prior to
Oncormed, Mr. Johnston held various positions including Assistant Treasurer at
American Mobile Satellite Corporation, a telecommunications company in Reston,
Virginia from 1990 to 1994. Mr. Johnston received his B.A. degree from the
University of Virginia and his M.B.A. from the Darden Graduate School of
Business at the University of Virginia.

     Michael A. Nemzek has served as our Chief Business Officer since February
2000. From December 1998 to February 2000, he was our Senior Vice President of
Sales and Marketing. Prior to joining our company, Mr. Nemzek was previously
Vice President, Marketing - Tropix Center of Excellence, PE Biosystems Division
of Perkin Elmer Corporation, a life sciences company, from 1996 to 1998. Prior
to Perkin Elmer, Mr. Nemzek was Vice President of Sales and Marketing at Genosys
Biotechnologies, Inc., a manufacturer of

                                       43
<PAGE>   46

custom synthetic DNA, peptides, genes and kit products from 1994 to 1996 and
Vice President of Sales and Marketing for Tropix, Inc., a manufacturer of
non-isotopic reagents from 1991 to 1994. Mr. Nemzek received his B.A. degree in
Chemistry from the University of North Carolina at Charlotte, his M.Sc. degree
in Analytical Chemistry from North Carolina State University and his Master of
General Administration in Marketing Management from the University of Maryland.

     Alan W. Seadler, Ph.D. has served as our Chief Operating Officer since
February 2000. From January 1999 to February 2000, Dr. Seadler was our Vice
President, Manufacturing and Operations. Dr. Seadler was Vice President for
Technology Development and Reagent Manufacturing at Visible Genetics, Inc., a
reagent/kit diagnostic company, from 1996 to 1999. Prior to Visible Genetics, he
was a Site Manager for Amersham Life Science, Inc., a biomedical research and
manufacturing firm, from 1995 to 1996. Dr. Seadler was the Vice President,
Operations, General Manager at Biological Detection Systems, Inc., a reagents
company, from 1991 to 1995. Dr. Seadler received his B.A. degree in Biology and
Chemistry and his Ph.D. in Biology from the Case Western Reserve University.

     William Busa, Ph.D. has served as our Vice President of Bioinformatics
since September 1999. Prior to joining our company, Dr. Busa was the consulting
editor for the American Association for the Advancement of Science, Knowledge
Environment Development Program from 1998 to 1999. Dr. Busa was also President
of Memex Press, Inc., a technical publisher, from 1996 to 1999. Dr. Busa also
served on the faculty of Johns Hopkins University for eleven years. Dr. Busa
received his B.S. degree in the fields of Biological, Information and Computer
Sciences at the University of California at Irvine and his Ph.D. in Zoology from
the University of California at Davis.

     Jefferson W. Paslay, Ph.D. has served as our Senior Vice President
Pharmaceutical Technologies since September 1998. Prior to joining our company,
Dr. Paslay held various positions including General Manager at MDS-Panlabs, a
screening services organization, from 1994 to 1998. Prior to MDS-Panlabs, he
held various positions including Director, Chemical and Biological Screening at
the Upjohn Company from 1981 to 1994. Dr. Paslay received his B.Sc. degree in
Biology from the University of Mississippi, his M.Sc. degree in Microbiology
(Immunology) from the University of Mississippi and his Ph.D. in Molecular Cell
Biology (Immunology) from the University of Alabama, Birmingham.

     Albert Gough, Ph.D. has served as our Vice President Research and
Development since May 1999. From December 1998 to May 1999, he served as our
Vice President of Systems Engineering and from November 1996 to December 1998,
he served as our Director of Drug Discovery Systems. Prior to joining our
company, Dr. Gough was the Director of Imaging Technology at Carnegie Mellon
University where he directed a project in the development of automated imaging
systems for scientific research applications from 1993 to 1996. Dr. Gough
received his B.S. degree in Biology from the University of Michigan and his
Ph.D. in Biophysics from Carnegie Mellon University.

     John M. Boles has served as a director and the Chairman of our Board since
our inception in 1995. Mr. Boles is a founder of our company. Mr. Boles has been
engaged in the investment banking business since 1972 and has served for the
last five years as Managing Partner of Boles Knop & Company LLC, an investment
banking firm. Mr. Boles received his undergraduate degree from Lake Forest
College, his M.S. from the University of Toronto and his M.B.A. from the
University of Michigan.

     Alan Mendelson has served as a director since 1998. He is a co-founder and
partner of Axiom Ventures, a venture capital firm which focuses on investing in
biotech/hi-tech companies, for more than the past five years. Mr. Mendelson
received his B.A. degree in Economics from Trinity College and his law degree
from the University of Connecticut. Mr. Mendelson is a director of Ziplink Inc.,
a publicly traded company.

     Arnold L. Oronsky, Ph.D. has served as a director since 1998. He has been a
general partner in InterWest Partners, a venture capital firm investing in the
medical technology sector, since 1994. Dr. Oronsky received his B.A. degree from
New York University and his Ph.D. from Columbia University, College of
Physicians & Surgeons. Dr. Oronsky is a director of Corita Corporation, a
publicly traded company and Coulter Pharmaceutical, Inc., a publicly traded
company.

                                       44
<PAGE>   47


     Barclay "Buck" Phillips has served as a Managing Director of Vector Fund
Management since 1999. Prior to joining Vector Fund Management, Mr. Phillips was
Director of Private Placements and Biotechnology Analyst for INVESCO Funds
Group, Inc. from 1991 to 1999. Mr. Phillips has in the past, and currently
serves as a director of a number of privately-held companies in the health care
industry. Mr. Phillips received his B.A. degree in Economics from the University
of Colorado in Boulder.


     James A. Sharp has served as a director since 1996. He has been the
President, Microscopy Division of Carl Zeiss, Inc., a subsidiary of Carl Zeiss
Jena, GmbH, since October 1999. From 1995 to 1999, Mr. Sharp was a Senior Vice
President of Carl Zeiss Jena, GmbH, a manufacturer of optical, scientific and
industrial instruments. Mr. Sharp received a degree from The DeVry Institute of
Technology.

COMPOSITION OF THE BOARD

     Our amended and restated certificate of incorporation and bylaws provide
that our board of directors be divided into three classes of nearly equal
number: Classes A, B and C. The term of office of directors comprising Class A
expires at the next annual meeting of stockholders; the term of office of
directors comprising Class B expires at the second annual meeting of
stockholders; and the term of office of directors comprising Class C expires at
the third annual meeting of stockholders. At each annual meeting of stockholders
thereafter, the successors to directors whose terms will then expire will be
elected to serve from the time of election and qualification until the third
annual meeting of stockholders following election and until a successor will
have been duly elected and will have qualified.

     Our bylaws authorize our board of directors to fix the number of directors
at not less than one. The board of directors currently has five members. The
board of directors has no present plans to increase the number of directors.

     There are no family relationships among any of our directors or executive
officers.

     Our amended and restated certificate of incorporation requires the
affirmative vote of holders of 80% of the issued and outstanding shares of
common stock entitled to vote for the election of directors to remove any
director or the entire board of directors. Under Delaware law, our directors can
only be removed for "cause."

BOARD COMMITTEES

     Our board of directors currently has two committees: an audit committee and
a compensation committee.

     The audit committee was established on March 18, 1998, and reviews, acts on
and reports to our Board of Directors with respect to various auditing and
accounting matters, including the recommendation of our independent accountants,
the scope of the annual audits, the fees to be paid to the independent
accountants, the performance of our independent accountants and our accounting
practices. The members of the audit committee are Messrs. Boles and Mendelson
and Dr. Oronsky.

     The compensation committee was established on March 18, 1998, and
recommends, reviews and oversees the salaries, benefits, granting of options and
stock plans for our employees, consultants and directors. The compensation
committee also administers our compensation plans. The members of the
compensation committee are Messrs. Boles and Mendelson and Dr. Oronsky.

DIRECTOR COMPENSATION


     All of our directors are reimbursed for the reasonable expenses of
attending the meetings of our board of directors or committees. Under our 2000
Stock Option Plan, each non-employee member of our Board of Directors was
granted an option to purchase 11,772 shares of our common stock in March 2000.
These options vest in two installments, on March 1, 2000, and March 1, 2001, for
our current non-employee directors. In the case of first time directors, vesting
will occur in three installments beginning on the date that he or she joins our
board and on the first and second yearly anniversaries of that date. Other than
the forgoing, the directors receive no other compensation for their services as
directors.


                                       45
<PAGE>   48

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     Our compensation committee currently consists of Messrs. Boles and
Mendelson and Dr. Oronsky. No member of the compensation committee has been an
officer or employee of ours at any time. No interlocking relationship exists
between any member of our board of directors or our compensation committee and
any member of our board of directors or compensation committee of any other
corporation. Prior to the formation of the compensation committee on March 18,
1998, our board of directors as a whole made decisions relating to compensation
of our executive officers.

EXECUTIVE COMPENSATION

                           SUMMARY COMPENSATION TABLE

     The following table sets forth the annual compensation earned during 1999
by our chief executive officer and the four highest paid executive officers
whose total annual salary and bonus exceeded $100,000. These individuals are
referred to as the "named executive officers" here and elsewhere in this
prospectus.

<TABLE>
<CAPTION>
                                                                    ANNUAL COMPENSATION
                                                            ------------------------------------
                                                                                   OTHER ANNUAL
              NAME AND PRINCIPAL POSITION                    SALARY      BONUS     COMPENSATION
              ---------------------------                   --------    -------    -------------
<S>                                                         <C>         <C>        <C>
D. Lansing Taylor, Ph.D.................................    $255,000    $40,000            --
  President and Chief Executive Officer

R. Terry Dunlay.........................................     135,000     22,950            --
  Executive Vice President and Chief Information Officer

L. Robert Johnston, Jr..................................     173,147     29,240       $53,837(1)
  Vice President and Chief Financial Officer

Michael Nemzek..........................................     170,567     47,600        73,457(2)
  Senior Vice President of Sales and Marketing

Alan Seadler............................................     100,000     35,000            --
  Chief Operating Officer
</TABLE>

---------------
(1) Mr. Johnston's other annual compensation for 1999 reflects a relocation
    allowance.

(2) Mr. Nemzek's other annual compensation for 1999 reflects a relocation
    allowance.

                                       46
<PAGE>   49

                               1999 OPTION GRANTS


     The following table sets forth information regarding options granted to
each of our named executive officers during the year 1999. The percentage of
options granted is based on an aggregate of 486,533 options granted by us during
1999. The amounts shown as potential realizable value are based on assumed 5%
and 10% annual rates of stock price appreciation from the date of grant to the
end of the option term and are provided in accordance with rules of the SEC.
They do not represent our estimate or projections of the future common stock
price. Actual gains, if any, on stock option exercise are dependent on the
future performance of our common stock, overall market conditions and the option
holder's continued employment during the vesting period. All options in this
table were granted under our Cellomics, Inc. Stock Plan, have ten year terms,
will terminate before their expiration dates if the optionee leaves his
employment with us, and, unless otherwise noted, vest over a period of four
years. We have not granted any stock appreciation rights. In estimating the gain
realized by these option holders, we have deducted the option exercise price,
but have not deducted taxes or any other expenses payable upon the exercise of
the option or the sale of the common stock underlying the option.



<TABLE>
<CAPTION>
                                                  INDIVIDUAL GRANTS
                            -------------------------------------------------------------     POTENTIAL REALIZABLE VALUE AT
                            NUMBER OF                                                         ASSUMED ANNUAL RATES OF STOCK
                            SECURITIES    PERCENT OF TOTAL                                    PRICE APPRECIATION FOR OPTION
                            UNDERLYING   OPTIONS GRANTED TO                                              TERM(1)
                             OPTIONS        EMPLOYEES IN      EXERCISE PRICE   EXPIRATION   ----------------------------------
           NAME              GRANTED      FISCAL YEAR 1999      PER SHARE         DATE         0%          5%          10%
           ----             ----------   ------------------   --------------   ----------   --------   ----------   ----------
<S>                         <C>          <C>                  <C>              <C>          <C>        <C>          <C>
D. Lansing Taylor,
  Ph.D. ..................        --             --                  --              --           --           --           --
R. Terry Dunlay...........
L. Robert Johnston, Jr....    17,660(2)           4%              $0.16         11/9/09      297,420      461,396      701,301
Michael Nemzek............    17,660(3)           4                0.16         12/9/09      297,420      461,396      701,301
Alan Seadler..............    52,980(4)          11                0.16         1/18/09      892,260    1,453,398    2,314,293
                              17,660(5)           4                0.16         6/25/09      297,420      484,466      771,431
</TABLE>


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


  (1) The potential realizable values have been calculated using an assumed
      initial public offering price of $17.00 per share.



  (2) The vesting start date for the options to purchase 17,660 shares of common
      stock granted to Mr. Johnston is November 9, 1998.



  (3) The vesting start date for the options to purchase 17,660 shares of common
      stock granted to Mr. Nemzek is December 2, 1998.



  (4) The vesting start date for options to purchase 52,980 shares of common
      stock granted to Mr. Seadler is January 18, 1999.



  (5) The vesting start date for the options to purchase 17,660 shares of common
      stock granted to Mr. Seadler is June 25, 1999.


                               1999 OPTION VALUES


<TABLE>
<CAPTION>
                                            NUMBER OF SECURITIES                 VALUE OF UNEXERCISED
                                       UNDERLYING UNEXERCISED OPTIONS            IN-THE-MONEY OPTIONS
                                            AT DECEMBER 31, 1999                AT DECEMBER 31, 1999(1)
                                       -------------------------------       -----------------------------
                NAME                   EXERCISABLE      UNEXERCISABLE        EXERCISABLE     UNEXERCISABLE
                ----                   ------------     --------------       -----------     -------------
<S>                                    <C>              <C>                  <C>             <C>
D. Lansing Taylor, Ph.D..............    105,960           141,280            1,784,520        2,379,360
R. Terry Dunlay......................     35,320            35,320              594,840          594,840
L. Robert Johnston, Jr...............     30,905            92,715              520,485        1,561,455
Michael Nemzek.......................     30,905            92,715              520,485        1,561,455
Alan Seadler.........................                       88,300                             1,487,100
</TABLE>


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


  (1) The value of unexercised in-the-money options at December 31, 1999 has
      been calculated using an assumed initial public offering price of $17.00
      per share.


   There were no options exercised during the year ended December 31, 1999.

                                       47
<PAGE>   50

1998 STOCK PLAN


     Our stock plan was adopted by our board of directors on April 2, 1998. As
of June 30, 2000, there were options to purchase 1,458,363 shares of common
stock granted under this plan. The board of directors adopted a resolution
prohibiting further grants under this plan.


     The stock plan provides for the grant of incentive stock options to
employees, non-qualified stock options, stock awards, stock appreciation rights
and stock purchases. The stock plan provides that it will be administered by our
board of directors, or a committee appointed by the board, which determines
recipients and types of awards to be granted, including number of shares under
the award and the vesting of the award. As of the date of this prospectus, all
awards granted under the stock plan have been made to our employees, directors
and consultants and have been in the form of non-qualified stock options. All
awards under the stock plan terminate not more than 10 years from the date of
grant, subject to the earlier termination upon or after a fixed period following
an optionee's death or termination of employment with us. The vesting provisions
of each outstanding option was determined by our board of directors and those
options are not generally assignable or otherwise transferable except by will or
the laws of descent and distribution. In the event of a change in control and in
other circumstances described in the stock plan, our board of directors can
substitute on an equitable basis our securities with securities of the successor
or surviving entity in the change of control, require that the unexercised
awards be exercised within a certain period of time, or allow the unexercised
portions of the awards to be purchased by the successor entity at the then fair
market value.

2000 STOCK PLAN


     We have adopted a new stock plan known as the 2000 Stock Plan. We have
reserved 1,165,560 shares of our common stock for issuance upon exercise of
awards under the 2000 Stock Plan. The following is a description of the material
features and provisions of the 2000 Stock Plan.


Awards

     Under the 2000 Stock Plan, we may grant incentive stock options intended to
qualify for special tax treatment, non-qualified stock options, stock grants,
stock appreciation rights and stock purchase rights. Each option or appreciation
right will expire within 10 years of the original grant date, unless the grantee
owns more than 10% of our stock, in which case the option or appreciation rights
will expire within 5 years of the original grant date. Incentive options may not
have exercise prices less than the fair market value at the time of grant. If
the grantee owns more than 10% of our stock, the option may not have an exercise
price less than 110% of the fair market value at the time of grant. Upon
exercise, an option grantee may pay for the shares with cash, other shares,
shares deducted from the total granted under the option or other compensation
acceptable to the administrator of the plan.

     If a grantee's employment is terminated, the grantee may, within 90 days
after termination, exercise his or her option or appreciation right to the
extent that the option has vested by the date of termination. If a grantee is
disabled, the grantee may, within 12 months after becoming disabled, exercise
his or her option or appreciation right to the extent that the option has vested
by the date of becoming disabled. If a grantee dies, the grantee's estate may,
within 12 months of the grantee's death, exercise the grantee's option or
appreciation right to the extent that the option has vested by the date of the
grantee's death. In each case, the option terminates with respect to the shares
that had not vested. Other than by will or other transfer on death, options and
appreciation rights are not transferrable.

Administration

     The 2000 Stock Plan may be administered either by our board of directors,
or by a committee appointed by our board. The administrator, whether our board
or a committee, will have the authority to determine the fair market value of
the common stock for the purposes of making an award select the eligible persons
to whom awards may be granted, make the awards, determine the number of shares
to be covered by each award, offer to buy out for cash or shares a granted
option or appreciation right and determine the form, terms and conditions of any
agreement by which any award is made. The administrator may also determine
                                       48
<PAGE>   51

whether an option or appreciation right will be paid in cash rather than stock,
whether and to what extent payment of an award may be deferred, whether under
certain circumstances to reduce the exercise price of an award and the
restrictions applicable to any stock grants or purchase rights. The 2000 Stock
Plan will expire on March 1, 2010.

Eligibility

     Under the terms of the 2000 Stock Plan, nonstatutory options may be granted
to our employees, non-employee directors and consultants. Incentive stock
options may be granted only to our employees. Incentive stock options may not
exceed $100,000 to any one person in one year. If an incentive stock option does
exceed $100,000, the excess is considered to be a non-statutory option.

Adjustments

     If a reorganization, recapitalization, stock dividend, merger,
consolidation or other change in corporate structure affecting the number of
issued shares of our common stock occurs, then the administrator of the plan can
make equitable adjustments to the terms of the 2000 Stock Plan. In particular,
the administrator can make an equitable adjustment in the number and type of
shares authorized by the plan, the number and type of shares covered by
outstanding awards under the plan, the exercise prices of the awards and, in the
case of a merger or consolidation, the date of exercisability if the award is
not assumed by the other entity. After the adjustments, any incentive stock
options granted under the plan must continue to qualify as incentive stock
options. The board of directors can amend or terminate this plan any time,
although certain amendments require stockholder approval and an amendment or
termination cannot adversely affect any rights under an outstanding grant
without the grantee's consent.

Change in Control

     The 2000 Stock Plan includes change in control provisions which may result
in the accelerated vesting of outstanding option grants and stock issuances. If
we are acquired by merger or asset sale, each outstanding option under the
discretionary option grant program which is not to be assumed by the successor
corporation will immediately become exercisable for all the option shares, and
all outstanding unvested shares will immediately vest, except to the extent our
repurchase rights with respect to those shares are to be assigned to the
successor corporation. Our compensation committee has the discretion to, on a
change in control, vest and make exercisable any option granted under the plan.
In addition, our compensation committee may grant options and structure
repurchase rights so that the shares subject to those options or repurchase
rights will immediately vest in connection with a successful tender offer for
more than 50% of our outstanding voting stock or a change in control of our
board through one or more contested elections. Such accelerated vesting may
occur either at the time of such transaction or upon the subsequent termination
of the individual's service.

EMPLOYEE STOCK PURCHASE PLAN

     Our board of directors intends to adopt a new employee stock purchase plan
to present to our stockholders for approval prior to the completion of this
offering. If adopted, our Employee Stock Purchase Plan will provide our
employees with an opportunity to purchase our common stock through accumulated
payroll deductions and at a discount from fair market value. The total number of
shares of common stock with respect to which purchases may be made under the
plan will be 1,059,600, which amount shall be adjusted in accordance with the
terms of the plan. The Employee Stock Purchase Plan will be administered by our
compensation committee. Eligible employees may purchase up to a maximum fair
market value of $25,000 for all purchases ending within the same calendar year
under this plan. Our employees will be eligible to participate if they are
employed by us for at least 20 hours per week, for more than five months in any
calendar year and do not own 5% or more of our voting stock. The initial
offering period under the plan will commence on the date that the registration
statement with respect to this offering is declared effective by the SEC, and
will end on or about December 31, 2000. We intend to have new offering periods
commence every six months after the ending date of the initial period. The
purchase price per share for our common
                                       49
<PAGE>   52

stock under the plan will be equal to the lower of 85% of the fair market value
of our common stock on the first or last day of each purchase period. Employees
may end their participation under the plan at any time prior to the exercise
date of any one purchase period and, generally, such participation will be
automatically terminated on termination of employment. In the event we are the
surviving corporation in a merger, reorganization or other business combination,
options to purchase shares issued under the plan will be assumed. A dissolution
or liquidation or a merger or consolidation in which we are not the surviving
entity will cause each option then outstanding to terminate. Generally, our
board of directors will have the power to amend, modify or terminate the plan at
any time, provided the rights of plan participants are not impaired. The plan
will terminate on December 31, 2005 unless earlier terminated by our board of
directors.

EMPLOYMENT AND SEVERANCE AGREEMENTS

     All of our current employees have entered into agreements with us that
contain covenants relating to the protection of our confidential information,
assignment of inventions, restrictions on competition and soliciting our
customers, employees or independent contractors. We also have employment
agreements with our chief executive officer and each of the named executive
officers.

     Dr. Taylor serves as our President and Chief Executive Officer. Dr.
Taylor's employment agreement is for a period of three years ending September
30, 2001. If Dr. Taylor is terminated without cause, as that term is defined in
the agreement, he is entitled to receive all earned salary, bonuses and fringe
benefits through the date of notice of termination, 12 months' salary following
the date of notice, and automatic acceleration of all options held at that date.
At the discretion of our board, Dr. Taylor's base salary is subject to annual
adjustment increases of $5,000 and $10,000 in each of the last two years,
respectively, of this agreement. In each year of the agreement, Dr. Taylor is
also entitled to receive an incentive bonus up to a maximum of twenty percent of
his base salary in that year, based on a formula agreed to with our board of
directors. However, our board of directors subsequently approved an increase in
Dr. Taylor's potential annual performance bonus for 2000 from twenty percent to
thirty percent, and may award other bonuses in its discretion. In addition,
options held by Dr. Taylor as of December 31, 1999 vest on October 1 of each
year of his continued employment.

     Under an agreement with us dated February 2, 1999, Mr. Dunlay serves as our
Executive Vice-President of Development. He is entitled to receive an initial
annual salary of $135,000 and annual performance bonuses up to twenty percent of
his salary subject to review and approval by our board of directors. The term of
Mr. Dunlay's agreement is for a one year period that automatically renews unless
we terminate the agreement prior to ninety days before the beginning of the next
term. If we terminate Mr. Dunlay, unless that termination is for cause, as
defined in the agreement, we are obligated to pay him an amount equal to six
months of his base salary.

     Under an agreement with us dated October 15, 1998, Mr. Johnston serves as
our Vice-President and Chief Financial Officer. He is entitled to an annual
salary of $172,000, subject to adjustment by the Board of Directors. He is also
eligible to receive annual performance bonuses up to twenty percent of his
salary subject to review and approval by our board of directors. However, our
board of directors subsequently approved an increase in Mr. Johnston's potential
annual performance for 2000 from twenty percent to twenty-five percent and may
award other bonuses in its discretion. Mr. Johnston was also provided with a
relocation allowance of $53,837. All of Mr. Johnston's unvested options will
vest on a change of control and if Mr. Johnston is terminated by constructive
termination, as defined in the agreement, fifty percent of his unvested option
will vest on the date of termination. If we terminate Mr. Johnston, unless that
termination is for cause, as defined in the agreement, we are obligated to pay
him an amount equal to six months of his base salary.

     Under an agreement with us dated November 9, 1998, Mr. Nemzek serves as our
Senior Vice-President for Sales and Marketing. He is entitled to an annual
salary of $170,000, subject to adjustment by the Board of Directors. He is also
eligible to receive annual performance bonuses up to thirty-five percent of his
salary subject to review and approval by our board of directors. Mr. Nemzek was
also provided with a relocation allowance of $73,457. If we terminate Mr.
Nemzek, unless that termination is for cause, as defined in the agreement, we
are obligated to pay him an amount equal to six months of his base salary.

                                       50
<PAGE>   53

     Under an agreement with us dated October 12, 1998, Mr. Seadler serves as
our Chief Operating Officer. He is entitled to receive an initial annual salary
of $100,000 and annual performance bonuses up to twenty percent of his salary
subject to review and approval by our board of directors. Mr. Seadler was also
provided an additional $10,000 signing bonus upon his start date. If we
terminate Mr. Seadler, unless that termination is for cause, as defined in the
agreement, we are obligated to pay him an amount equal to six months of his base
salary.

LIMITATION OF LIABILITY AND INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 145 of the Delaware General Corporation Law authorizes a
corporation's board of directors to grant indemnity to directors and officers in
terms sufficiently broad to permit such indemnification under certain
circumstances for liabilities arising under the Securities Act, including
reimbursement for expenses incurred.

     As permitted by Delaware law, our amended and restated certificate of
incorporation limits the liability of directors for monetary damages for breach
of their fiduciary duties as directors, except liability for:

     - any breach of their duty of loyalty to us or our stockholders;

     - acts or omissions not in good faith or which involve intentional
       misconduct or a knowing violation of law;

     - unlawful payments of dividends or unlawful stock repurchases or
       redemptions; or

     - any transaction from which the director derived an improper personal
       benefit.

     Our amended and restated certificate of incorporation and bylaws provide
that we shall indemnify our directors, officers, employees and agents to the
fullest extent permitted by law, and that we will advance expenses to our
directors and officers in connection with a legal proceeding, subject to an
undertaking to repay our costs, should the indemnified person lose the
proceeding.

     Prior to the completion of this offering, we intend to enter into
indemnification agreements with each of our officers and directors to give them
additional contractual assurances regarding the scope of the indemnification
provided in our amended and restated certificate of incorporation and bylaws,
and to provide additional procedural protections.

     There is currently no pending litigation or proceeding involving any of our
directors, officers, employees or agents where indemnification will be required
or permitted. We are not aware of any pending or threatened litigation or
proceeding that might result in a claim for such indemnification.

                                       51
<PAGE>   54

                              CERTAIN TRANSACTIONS

REGISTRATION RIGHTS

     Some of our stockholders, some of whom own more than 10% of our common
stock, have certain registration rights which they may exercise after this
offering. They may request that we register their shares for sale with the
Securities and Exchange Commission, and, if all of the conditions that are
contained in our agreements with them are met, we must register their shares. We
would be required to bear all the expenses of a registration. For a more
detailed description see also "Description of Capital Stock -- Registration
Rights."

PRIOR FINANCINGS

January 1998 and 1999 Series A Preferred Financing

     In January 1998 we sold an aggregate of 3,477,222 shares of our Series A
preferred stock at a price of $1.59 per share and issued warrants to purchase an
aggregate of 942,705 shares of common stock with exercise prices ranging from
$1.59 to $1.87.

In that private placement we sold:

     - 1,142,560 and 35,822 shares of Series A preferred stock and issued
       warrants to purchase 228,513 and 7,163 shares of our common stock to
       InterWest Partners VI, L.P. and InterWest Investors VI, L.P.,
       respectively;

     - 864,146 shares of Series A preferred stock and issued warrants to
       purchase an additional 172,828 shares of our common stock to Axiom
       Venture Partners II Limited Partnership;

     - 771,693 and 13,895 shares of Series A preferred stock and issued warrants
       to purchase 154,338 and 2,780 shares of our common stock to Delphi
       Ventures III, L.P. and Delphi BioInvestments III, L.P., respectively;

     - 179,623 and 134,612 shares of our Series A preferred stock and issued
       warrants to purchase 35,924 and 26,924 shares of our common stock to
       Oxford Bioscience Partners II, L.P. and Oxford Bioscience Partners
       (Bermuda) II Limited Partnership, respectively; and

     - 314,235 shares of Series A preferred stock, to Komasta Properties, Ltd.

     In addition, we converted a $450,000 note plus accrued interest into
314,235 shares of Series A preferred stock and issued warrants to purchase an
aggregate of 188,542 shares of our preferred stock with an exercise price of
$2.39 to Komasta Properties, Ltd.

     In January 1999 as a subsequent closing we sold an aggregate of 3,142,350
shares of our Series A preferred stock at a price of $1.59 per share.

     In that private placement we sold:

     - 1,142,560 and 35,822 shares of Series A preferred stock to InterWest
       Partners VI, L.P. and InterWest Investors VI, L.P., respectively;

     - 864,146 shares of Series A preferred stock to Axiom Venture Partners II
       Limited Partnership;

     - 771,693 and 13,895 shares of Series A preferred stock to Delphi Ventures
       III, L.P. and Delphi BioInvestments III, L.P., respectively; and

     - 179,623 and 134,612 shares of our Series A preferred stock to Oxford
       Bioscience Partners II, L.P. and Oxford Bioscience Partners (Bermuda) II
       Limited Partnership, respectively.

November 1999 Convertible Debt Financing

     In November 1999, we issued convertible promissory notes in the aggregate
principal amount of $1.8 million. These notes carried an interest rate of 10.0%
per year. On February 24, 2000, the outstanding

                                       52
<PAGE>   55

principal and interest on each of these convertible notes converted into 538,958
shares of our Series B preferred stock at a price of $3.42 per share, and we
issued warrants to purchase an aggregate of 289,624 shares of our common stock.
These warrants were issued at an exercise price of $3.42.

     In this transaction, the demand notes were converted into:

     - 217,751 and 6,824 shares of our Series B preferred stock and warrants to
       purchase 117,015 and 3,666 shares of common stock to InterWest Partners
       VI, L.P. and InterWest Investors VI, L.P., respectively;

     - 88,240 and 1,586 shares of our Series B preferred stock and warrants to
       purchase 47,417 and 851 shares of common stock to Delphi Ventures III,
       L.P. and Delphi BioInvestments III, L.P., respectively;


     - 164,690 shares of our Series B preferred stock and warrants to purchase
       88,501 shares of common stock to Axiom Venture Partners II Limited
       Partnership; and


     - 21,923, 16,427 and 21,517 shares of our Series B preferred stock and
       warrants to purchase 11,783, 8,826 and 11,564 shares of common stock to
       Oxford Biosciences Partners II, L.P., Oxford Biosciences Partners
       (Bermuda) II Limited Partnership and Oxford Biosciences Partners
       (GS-Adjunct) II, L.P., respectively.

February 2000 Series B Preferred Financing

     In February 2000, we sold an aggregate of 1,911,102 shares of our Series B
preferred stock at a price of $3.42 per share.

     In that private placement we sold:

     - 855,931 and 285,311 shares of our Series B preferred stock to Vector
       Later-Stage Equity Fund II (QP), L.P. and Vector Later-Stage Equity Fund
       II, L.P., respectively;

     - 157,919 and 4,952 shares of Series B preferred stock to InterWest
       Partners VI, L.P. and InterWest Investors VI, L.P., respectively;

     - 146,620 shares of our Series B preferred stock and warrants to purchase
       18,649 shares of common stock to Komasta Properties, Ltd.;

     - 114,981 and 2,070 shares of our Series B preferred stock to Delphi
       Ventures III, L.P. and Delphi BioInvestments III, L.P., respectively;

     - 95,731, 71,742 and 93,962 shares of our Series B preferred stock to
       Oxford Bioscience Partners II, L.P., Oxford Bioscience Partners (Bermuda)
       II Limited Partnership and Oxford Biosciences Partners (GS-Adjunct) II,
       L.P., respectively; and

     - 73,158 shares of Series B preferred stock to Axiom Venture Partners.


Conversion of Preferred Stock



     Our preferred stock will convert into common stock upon the closing of this
offering on a one-to-one basis. We must pay to the holders of the preferred
stock the dividend arrearages on their shares which are expected to approximate
$2.2 million as of the closing of this offering. Thus, we will be paying the
following amounts to the indicated preferred stockholder:



     - InterWest Partners VI, L.P. and InterWest Investors VI, L.P. will be paid
       approximately $684,000 and $21,000, respectively;



     - Axiom Venture Partners II Limited Partnership will be paid approximately
       $513,000;



     - Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P. will be
       paid approximately $458,000 and $8,000, respectively;


                                       53
<PAGE>   56


     - Oxford Bioscience Partners II, L.P., Oxford Bioscience Partners (Bermuda)
       II Limited Partnership, Oxford Biosciences Partners (GS-Adjunct) II, L.P.
       will be paid approximately $112,000, $84,000 and $9,000, respectively;



     - Komasta Properties, Ltd. will be paid approximately $231,000; and



     - Vector Later-Stage Equity Fund II (QP), L.P. and Vector Later-Stage
       Equity Fund II, L.P. will be paid approximately $94,000.


     Arnold L. Oronsky, Ph.D., a member of our board of directors, is a general
partner of InterWest Partners, an affiliate of InterWest Partners VI, L.P. and
InterWest Investors VI, L.P. Mr. Mendelson, a member of our board of directors,
is general partner of Axiom Ventures, an affiliate of Axiom Venture Partners.

ZEISS AGREEMENTS

     In April 1998 we entered into a collaboration agreement with Zeiss, which
holds in excess of 5% of our common stock. The collaboration agreement was
amended and restated by two agreements, a Development, Manufacturing and Supply
Agreement and a Sales and Marketing Agreement for UHTS Products in February
2000.

     Under the Development, Manufacturing and Supply Agreement, by which we
engaged Zeiss to cooperate in the development of our ArrayScan Kinetics Reader
and ArrayScan Kinetics Workstation products to our specifications, we have
capital expenditure commitments to Zeiss of $1.2 million during 2000 and have
agreed to reimburse Zeiss for an additional $2.0 million for development costs
incurred by Zeiss through December 31, 1999. We intend to repay the development
costs during 2000 and 2001 in equal installments of $1.0 million. We also
purchased approximately $317,000 and $165,000 of components from Zeiss for our
products in 1999 and 1998. Under the Agreement, we are the owner of all
intellectual property of components specifically developed and manufactured for
the ArrayScan products and Zeiss is prohibited from incorporating such
technology into competing products in consideration for our agreement to
purchase such products from Zeiss. Moreover, Zeiss has agreed to manufacture for
us high content screening instruments on an exclusive basis for a limited period
of time. Unless terminated earlier by either party after December 2002, the
Agreement shall remain in effect until December 31, 2005.

     Under the Sales and Marketing Agreement for UHTS Products, Zeiss has
appointed us to be Zeiss' exclusive dealer and distributor within North America
of certain ultra-high throughput screening systems manufactured by Zeiss which
are complementary with our products until December 31, 2005. We are free, under
the terms of the agreement, to sell the Zeiss products in North America at a
sales price we establish. We will retain all revenues from our sales of Zeiss'
products in North America.

TRANSACTIONS WITH DIRECTORS

     Mr. Boles, a member of our board, entered into a consulting agreement with
us in December, 1996. Under this agreement Mr. Boles was paid $5,000 per month.
The term of the agreement was for a period of two years from the date of its
execution. Under the agreement, Mr. Boles agreed to refrain from competing with
us in the full field of luminescence-based tools for drug discovery or
toxicology for a period of five years from the date of the agreement.

     In each transaction set forth above where executive officers, directors,
five percent or greater stockholders or affiliates of any of these persons
purchased shares, these shares were purchased at the same price, and on the same
terms, as share purchased by other investors at those times.

                                       54
<PAGE>   57

                             PRINCIPAL STOCKHOLDERS


     The following table sets forth as of August 31, 2000, as adjusted to give
effect to the sale of common stock offered hereby, certain information regarding
beneficial ownership of our common stock by:


     - each person or group of affiliated persons known by us to be the
       beneficial owner of more than 5% of the outstanding shares of common
       stock;

     - each director;

     - each named executive officer; and

     - all directors and named executive officers as a group.

     Beneficial ownership is determined according to the rules of the SEC, and
generally means that a person has beneficial ownership of a security if he or
she possesses sole or shared voting or investment power of that security, and
includes options that are currently exercisable or exercisable within 60 days.
Information with respect to beneficial ownership has been furnished to us by
each director, officer or 5% or more stockholder, as the case may be. Except as
otherwise indicated, we believe that the beneficial owners of the common stock
listed below, based on the information each of them has given to us, have sole
investment and voting power with respect to their shares, except where community
property laws may apply.


     This table lists applicable percentage ownership based on 14,124,002 shares
of common stock outstanding as of August 31, 2000, and also lists applicable
percentage ownership based on 20,124,002 shares of common stock outstanding
after the completion of this offering. Options to purchase shares of our common
stock that are exercisable within 60 days of August 31, 2000 are deemed to be
beneficially owned by the persons holding these options for the purpose of
computing any other person's ownership percentage.


     The address for each officer who is a 5% holder is c/o Cellomics, Inc., 635
William Pitt Way, Pittsburgh, Pennsylvania 15238.




<TABLE>
<CAPTION>
                                                                                     PERCENTAGE
                                                                                  OF COMMON STOCK
                                                                           ------------------------------
                                                          SHARES SUBJECT   PERCENT BEFORE   PERCENT AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER      TOTAL NUMBER      TO OPTIONS        OFFERING        OFFERING
------------------------------------      ------------    --------------   --------------   -------------
<S>                                       <C>             <C>              <C>              <C>
DIRECTORS AND NAMED OFFICERS
D. Lansing Taylor, Ph.D. ...............     865,340         141,280             6.1%            4.3%
R. Terry Dunlay.........................     494,480          35,320             3.5             2.5
L. Robert Johnston, Jr. ................      30,905          30,905           *               *
Michael A. Nemzek.......................      30,905          30,905           *               *
Alan W. Seadler, Ph.D. .................      17,660          17,660           *               *
John M. Boles...........................     731,908           7,848             5.2             3.6
Alan Mendelson..........................   2,235,317(1)        7,848            15.8            11.1
James A. Sharp..........................       7,848           7,848           *               *
Arnold Oronsky, Ph.D. ..................   3,108,414(2)        7,848            22.0            15.4
Barclay Phillips........................   1,141,242(3)           --             8.1             5.7
All executive officers and directors as
  a group (10 persons)..................   8,664,020         287,462            60.1            42.4
</TABLE>


                                       55
<PAGE>   58


<TABLE>
<CAPTION>
                                                                                     PERCENTAGE
                                                                                  OF COMMON STOCK
                                                                           ------------------------------
                                                          SHARES SUBJECT   PERCENT BEFORE   PERCENT AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER      TOTAL NUMBER      TO OPTIONS        OFFERING        OFFERING
------------------------------------      ------------    --------------   --------------   -------------
<S>                                       <C>             <C>              <C>              <C>
5% STOCKHOLDERS
InterWest Management VI LLC.............   3,100,566(4)                         22.0%           15.4
Axiom Venture Partners II Limited
  Partnership...........................   2,227,469(5)                         15.8            11.1
Delphi Management III, L.L.C. ..........   1,983,439(6)                         14.0             9.9
Vector Fund Management, L.P. ...........   1,141,242(3)                          8.1             5.7
OBP Management II L.P. .................     651,648(7)                          4.6             3.2
OBP Management (Bermuda) II Limited
  Partnership...........................     393,145(8)                          2.8             2.0
Komasta Properties, Ltd. ...............     982,281(9)                          7.0             4.9
Carl Zeiss Holding Co., Inc. ...........     703,995(10)                         5.0             3.5
Alan S. Waggoner........................     688,740(11)                         4.9             3.4
</TABLE>


---------------
  *  Less than 1%.

 (1) Includes 1,966,141 shares of common stock that are held by Axiom Venture
     Partners II Limited Partnership and immediately exercisable warrants to
     purchase 172,828 and 88,501 shares of common stock at exercise prices of
     $1.87 and $3.42 per share, respectively. Axiom Venture Associates II
     Limited Liability Company is the general partner of Axiom Venture Partners
     II Limited Partnership. Mr. Mendelson shares voting control with the other
     three managing members of Axiom Venture Associates II Limited Liability
     Company, Samuel McKay and Linda Sonntag. Each managing members' address is
     c/o Axiom Venture Partners II Limited Partnership, City Place II, 185
     Asylum Street, 17th Floor, Hartford, Connecticut 06103.

 (2) Includes 2,660,790 shares of common stock held InterWest Partners VI, L.P.
     and 83,419 held by InterWest Investors VI, L.P. Also includes immediately
     exercisable warrants to purchase 228,513 and 117,015 shares of common stock
     at exercise prices of $1.87 and $3.42 per share, respectively, held by
     InterWest Partners VI, L.P. and immediately exercisable warrants to
     purchase for 7,163 and 3,666 shares of common stock at exercise prices of
     $1.87 and $3.42, respectively held by InterWest Investors VI, L.P.
     InterWest Management Partners VI, LLC is the general partner of both
     InterWest Partners, L.P. and InterWest Investors, VI. Dr. Oronsky is a
     managing director of InterWest Management Partners VI, LLC. Dr. Oronsky
     shares voting control over securities held by InterWest Partners, VI L.P.
     and InterWest Investor, VI, L.P. with the other managing directors of
     InterWest Management Partners VI, LLC, Berry Cash, Alan Crites, Philip
     Gianos, Scott Hedrick, Stephen Holmes, Bob Momsen and the venture member
     Gil Kliman. Dr. Oronsky and all other managing directors and members
     disclaim beneficial ownership of these shares, except to the extent they
     have pro rata interests in them. The managing directors' and the venture
     member's addresses are c/o InterWest Partners, 3000 Sand Hill Road, Menlo
     Park, California 94025.


 (3) Includes 855,931 shares of common stock held by Vector Later-Stage Equity
     Fund II (QP), L.P. and 285,311 shares of common stock held by Vector
     Later-Stage Equity Fund II, L.P. The general partner of each fund is Vector
     Fund Management, LLC, which has appointed Vector Fund Management, L.P. as
     the manager of the shares. There is no single person at the funds that
     exercises voting or investment control over the shares held by the funds.
     Voting and investment of the shares is conducted by an internal investment
     committee of Vector Fund Management, L.P. Mr. Phillips is a Managing
     Director of Vector Fund Management. The address of the funds is 1751 Lake
     Cook Road, Deerfield, IL 60015.



 (4) Includes 2,660,790 shares of common stock held InterWest Partners VI, L.P.
     and 83,419 held by InterWest Investors VI, L.P. Also includes immediately
     exercisable warrants to purchase 228,513 and 117,015 shares of common stock
     at exercise prices of $1.87 and $3.42 per share, respectively held by
     InterWest Partners VI, L.P. and immediately exercisable warrants to
     purchase for 7,163 and 3,666 shares of common stock at exercise prices of
     $1.87 and $3.42, respectively held by InterWest Investors VI, L.P.


                                       56
<PAGE>   59

     InterWest Management Partners VI, LLC is the general partner of InterWest
     Partners, L.P. and InterWest Investors, VI. Dr. Oronsky, Berry Cash, Alan
     Crites, Philip Gianos, Scott Hedrick, Stephen Holmes and Bob Momsen are the
     managing directors of InterWest Management Partners VI, LLC and share
     voting control with the venture member Gil Kliman. The address of the
     various InterWest partnerships is 3000 Sand Hill Road, Menlo Park,
     California 94025.


 (5) Includes 1,966,141 shares of common stock that are held by Axiom Venture
     Partners II Limited Partnership and immediately exercisable warrants to
     purchase 172,828 and 88,501 shares of common stock at exercise prices of
     $1.87 and $3.42 per share, respectively. Axiom Venture Associates II
     Limited Liability Company is the general partner of Axiom Venture Partners
     II Limited Partnership. Mr. Mendelson shares voting control with the other
     managing members of Axiom Venture Associates II Limited Liability Company,
     Samuel McKay and Linda Sonntag. Their address is c/o Axiom Venture Partners
     II Limited Partnership, City Place II, 185 Asylum Street, 17th Floor,
     Hartford, Connecticut 06103.



 (6) Includes 1,746,606 shares of common stock held by Delphi Ventures III, L.P.
     and 31,445 shares of common stock held by Delphi BioInvestments III, L.P.
     Also includes immediately exercisable warrants to purchase 154,338 and
     47,417 shares of common stock of exercise prices of $1.87 and $3.42 per
     share, respectively, held by Delphi Ventures III, L.P. and immediately
     exercisable warrants to purchase 2,780 and 851 shares of common stock at
     exercise prices of $1.87 and $3.42, respectively, held by Delphi
     BioInvestments III, L.P. Delphi Management Partners III, L.L.C. is the
     general partner of Delphi Ventures III, L.P. and Delphi BioInvestments III,
     L.P. The managing members of Delphi Management Partners III, L.L.C., James
     Bochnowski, David Douglas, and Donald Lothrop, share voting control and
     disclaim beneficial ownership except to the extent their pecuniary interest
     arises from their partnership interests. The address of the various Delphi
     partnerships is 3000 Sand Hill Road, Bldg. 3, 135, Menlo Park, CA 94025.



 (7) Includes 476,901 and 115,479 shares of common stock held by Oxford
     BioScience Partners II, L.P. and Oxford BioScience Partners (GS-Adjunct)
     II, L.P., respectively. Also includes warrants to purchase 35,924 and
     11,783 shares of common stock at exercise prices of $1.87 and $3.42,
     respectively held by Oxford BioScience Partners II, L.P. and a warrant to
     purchase 11,564 shares of common stock at an exercise price of $3.42 held
     by Oxford BioSciences Partners (GS-Adjunct) II, L.P. OBP - Management II
     L.P. is the general partner of Oxford BioScience Partners II, L.P. and
     Oxford BioScience Partners (GS-Adjunct) II, L.P. OBP - Management II L.P.
     and OBP Management (Bermuda) II Limited Partnership are controlled by the
     same individuals, Alan G. Walton, Cornelius P. Ryan, Edmund M. Olivier, and
     Jonathan J. Fleming. The address of the Oxford partnerships is 315 Post Rd
     West, Suite 2, Westport, CT 06880-4739.


 (8) Includes 357,392 shares of common stock held by Oxford Bioscience Partners
     (Bermuda) Limited Partnership, warrants to purchase 26,924 and 8,826 shares
     of common stock at exercise prices of $1.87 and $3.42, respectively held by
     Oxford Biosciences Partners (Bermuda) II Limited Partnership. OBP
     Management (Bermuda) II Limited Partnership. OBP - Management II L.P. is
     the general partner of Oxford BioScience Partners II, L.P. and Oxford
     BioScience Partners (GS-Adjunct) II, L.P. OBP - Management II L.P. and OBP
     Management (Bermuda) II Limited Partnership are controlled by the same
     individuals, Alan G. Walton, Cornelius P. Ryan, Edmund M. Olivier, and
     Jonathan J. Fleming. The address of the Oxford partnerships is 315 Post Rd
     West, Suite 2, Westport, CT 06880-4739.

 (9) Includes 775,090 shares of common stock and immediately exercisable
     warrants to purchase 188,542 shares of Series A preferred stock and 18,649
     shares of common stock at exercise prices per share of $2.39 and $3.42,
     respectively. Komasta Properties, Ltd.'s address is 21 Sderot Shaul
     Hamelech, Tel Aviv, 64367, Israel.

(10) Zeiss' address is 1 Zeiss Drive, Thornwood, New York 10594.

(11) Mr. Waggoner's address is 234 Lytton Avenue, Pittsburgh, Pennsylvania
     15213.

                                       57
<PAGE>   60

                          DESCRIPTION OF CAPITAL STOCK

GENERAL


     In accordance with our amended and restated certificate of incorporation,
we are authorized to issue up to 176,600,000 shares of common stock, par value
$.01 per share, and 17,660,000 shares of undesignated preferred stock, par value
$.01 per share. As of August 31, 2000, there were 14,124,002 shares of common
stock outstanding held by 24 stockholders of record, and no shares of preferred
stock were outstanding.


     The following summary description of our capital stock is not intended to
be complete and is qualified by reference to the provisions of applicable law
and to our amended and restated certificate of incorporation and our bylaws,
filed as exhibits to the registration statement of which this prospectus is a
part.

COMMON STOCK


     Based on the number of shares outstanding as of August 31, 2000, and giving
effect to the issuance of the 6,000,000 shares of common stock offered pursuant
to this prospectus, there will be 20,124,002 shares of common stock outstanding
upon completion of this offering. This includes the conversion of all
outstanding shares of Series A preferred stock and Series B preferred stock upon
the consummation of this offering. In addition, as of August 31, 2000, there
were outstanding stock options to purchase 1,741,477 shares of common stock.


     The holders of our common stock are entitled to one vote for each share
held of record upon such matters and in such manner as may be provided by law.
Subject to preferences applicable to any outstanding shares of preferred stock,
the holders of common stock are entitled to receive ratably dividends, if any,
as may be declared by the board of directors out of funds legally available for
dividend payments. In the event we liquidate, dissolve or wind up, the holders
of common stock are entitled to share ratably in all assets remaining after
payment of liabilities and liquidation preferences of any outstanding shares of
the preferred stock. Holders of common stock have no preemptive rights, or
rights 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.

PREFERRED STOCK

     We have no present plans to issue any additional shares of preferred stock.
However, the preferred stock is issuable from time to time in one or more series
and with such designations, preferences and other rights for each series as
shall be stated in the resolutions providing for the designation and issue of
each such series adopted by our board of directors. Our board of directors is
authorized by our amended and restated certificate of Incorporation to
determine, among other things, the voting, dividend, redemption, conversion,
exchange and liquidation powers, rights and preferences and the limitations
thereon pertaining to such series. Our board of directors, without stockholder
approval, may issue preferred stock with voting and other rights that could
adversely affect the voting power of the holders of the common stock and that
could have certain anti-takeover effects. The ability of our board of directors
to issue preferred stock without stockholder approval could have the effect of
delaying, deferring or preventing a change in control of us or the removal of
existing management.

                                       58
<PAGE>   61

WARRANTS


     As of June 30, 2000, the following warrants for the purchase of equity
securities were outstanding:



<TABLE>
<CAPTION>
                                                                     NUMBER OF SHARES
                                                                     OF COMMON STOCK
                                                                        FOR WHICH        PER SHARE
                                                                        WARRANT IS       EXERCISE
                                                 EXPIRATION DATE       EXERCISABLE         PRICE
                                                -----------------    ----------------    ---------
<S>                                             <C>                  <C>                 <C>
Common stock warrants issued January 21,
  1998........................................   January 21, 2002         628,470          $1.87
Common stock warrants issued January 21,
  1998........................................   January 20, 2003         314,235           1.59
Series A preferred stock purchase warrant
  issued January 21, 1998.....................      June 18, 2002          15,710           1.59
Series A preferred stock purchase warrant
  issued January 21, 1998.....................      July 31, 2002         188,542           2.39
Common stock subscription warrant issued June
  30, 1999(1).................................      June 30, 2004         114,790           1.87
Common stock subscription warrant issued
  August 30, 1999(1)..........................    August 30, 2004           1,515           1.87
Common stock subscription warrant issued
  October 4, 1999(1)..........................    October 4, 2004           1,335           1.87
Common stock subscription warrant issued
  December 14, 1999(1)........................  December 14, 2004           1,187           1.87
Common stock warrants issued February 23,
  2000........................................  February 23, 2004         309,382           3.42
</TABLE>


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

(1) These warrants may be exercised for a reduced number of shares without
    making a cash payment.


     Each warrant provides for adjustment of the exercise price and the number
of securities issuable upon exercise of the warrant in the event of a
reorganization of our capital structure or a stock split. In addition, the
exercise price and number of shares issuable upon exercise of the warrants for
the purchase of 1,575,166 shares of common stock will be adjusted if we issue
stock at prices below the exercise price of such warrants. These rights for
readjustment will terminate on the closing of this offering. Finally, we have
granted the holders of the warrants for the purchase of 1,142,104 shares of
common stock rights to register the common stock issuable upon exercise of the
warrants. We have agreed to issue warrants to a financial institution as partial
consideration for its extension of credit to us. If we borrow all of the
available credit under the agreement, we would issue warrants to purchase
approximately 38,000 shares of our common stock exerciseable at a price of $1.87
per share.


ANTI-TAKEOVER EFFECTS OF VARIOUS PROVISIONS OF DELAWARE LAW AND OUR AMENDED AND
RESTATED CERTIFICATE OF INCORPORATION AND BYLAWS

     Section 203 of the Delaware General Corporation Law. We are subject to
Section 203 of the Delaware General Corporation Law, which regulates corporate
acquisitions. In general, Section 203 prohibits a publicly-held Delaware
corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years following the date the person became an
interested stockholder, unless:

     - before the date of the business combination, the transaction is approved
       by our board of directors of the corporation;

     - upon consummation of the transaction that resulted in the stockholder's
       becoming an interested stockholder, he or she owned at least 85% of the
       voting stock of the corporation outstanding at the time the transaction
       commenced; or

                                       59
<PAGE>   62

     - on or subsequent to such date, the business combination is approved by
       our board of directors and authorized at an annual or special meeting of
       stockholders by the affirmative vote of at least 66 2/3% of the
       corporation's voting stock not owned by the interested stockholder.

     A "business combination" includes a merger, sale of assets or stock, or
other transaction resulting in a financial benefit to the interested
stockholder. In general, an "interested stockholder" is a person who, together
with affiliates and associates, owns, or within three years prior to the
determination of interested stockholder status, did own, 15% or more of a
corporation's voting stock. This statute could prohibit or delay the
accomplishment of mergers or other takeover or change of control attempts with
respect to us and, accordingly, may discourage attempts to acquire our company.

     In addition, various provisions of our amended and restated certificate of
incorporation, our bylaws and our 2000 Stock Plan, which provisions will be in
effect immediately after the completion of this offering and are summarized in
the following paragraphs, may be deemed to have an anti-takeover effect and may
delay, defer or prevent a tender offer or takeover attempt that a stockholder
might consider in its best interest, including those attempts that might result
in a premium over the market price for the shares held by stockholders.

     Classified Board of Directors. Our bylaws provide that, effective upon the
closing of this offering, the terms of office of the members of our board of
directors will be divided into three classes: Class A, whose term will expire at
the annual meeting of stockholders to be held in 2001, Class B, whose term will
expire at the annual meeting of stockholders to be held in 2002, and Class C,
whose term will expire at the annual meeting of stockholders to be held in 2003.
At each annual meeting of stockholders after the initial classification, the
successors to directors whose term will then expire will be elected to serve
from the time of election and qualification until the third annual meeting
following election. Our bylaws permit our board of directors to increase or
decrease the size of our board of directors. Any additional directorships
resulting from an increase in the number of directors will be distributed among
the three classes so that, as nearly as possible, each class will consist of
one-third of the total number of directors. Our amended and restated certificate
of incorporation requires the affirmative vote of holders of 80% of the issued
and outstanding shares of common stock entitled to vote for the election of
directors to remove any director or the entire board of directors. Under
Delaware law, our directors can only be removed for "cause." This removal
provision and the classification of our board of directors may have the effect
of delaying or preventing changes in control or our management.

     Amendment of Bylaws. Under our amended and restated certificate of
incorporation, the affirmative vote of the holders of at least 80% of the voting
power of all outstanding shares of our capital stock of Cellomics shall be
required to adopt, amend or repeal any provision of our bylaws.

     Prohibition on Written Consents. Under our amended and restated certificate
of incorporation, upon the closing of this offering, our stockholders may not
take action by written consent.

     Limitations on Special Meetings. Under our amended and restated certificate
of incorporation, upon the closing of this offering, special meetings of
stockholders may be called only by our president, the chairman of our board of
directors or a majority of our board of directors. Also, business transacted at
any special meeting must be limited to matters relating to the purposes set
forth in the notice of such special meeting.

     Board Discretion in Decision Making. Under our amended and restated
certificate of incorporation, our board of directors, when evaluating an offer
related to a tender offer or other business combination, is authorized to give
due consideration to any relevant factors, including the social, legal and
economic effects upon employees, suppliers, customers, creditors, the community
in which we conduct business, and the economy of the state, region and nation.

     Limitations on Amending Director Liability Limitation. Under our amended
and restated certificate of incorporation, the affirmative vote of at least 80%
of the voting power of all outstanding shares of our capital stock shall be
required to amend the limitations on liability of directors contained in our
amended and restated certificate of incorporation.

                                       60
<PAGE>   63

     Acceleration of Options on Change of Control. Under our 2000 Stock Plan, in
the event of certain mergers, a reorganization or consolidation of Cellomics
with or into another corporation or the sale of all or substantially all of our
assets or all of our capital stock wherein the successor corporation does not
assume outstanding options or issue equivalent options, our board of directors
is required to accelerate vesting of options outstanding.

REGISTRATION RIGHTS


     After the completion of this offering, the holders of approximately
10,641,450 shares of common stock held by purchasers of our preferred stock and
approximately 1,142,104 shares of common stock issuable upon conversion of
outstanding warrants will be entitled to rights to register these shares under
the Securities Act of 1933. Under the terms of the Series A Preferred Stock and
Warrant Purchase Agreement dated January 31, 1998, and the Series B Preferred
Stock Purchase Agreement dated February 23, 2000, whenever we propose to file a
registration statement under the Securities Act, the holders of registrable
securities are entitled to notice of the registration and have the right,
subject to limitations that the underwriters may impose on the number of shares
included in the registration, to include their registrable shares in the
registration.


     Additionally, beginning after January 1, 2001, stockholders who acquired
their shares of common stock upon conversion of our Series A preferred stock and
warrants issued in connection with our Series A financing have the right, upon
request by more than 50% of them, to require us to file a registration statement
covering their registrable securities on Forms S-1 or S-2 or any other
applicable form. Also, stockholders who acquired their shares upon conversion of
our Series B preferred stock or the exercise of warrants issued in connection
with our Series B financing have the right, upon request by more than 50% of
them, to require us to file a registration statement covering their registrable
shares on Forms S-1 or S-2 or any other applicable form. Under these rights,
each series of registrable shares can require us to register their shares if the
proposed public offering price of the shares held by those requesting
registration is at least $10,000,000. These registration rights are exercisable
only once per series if all registered securities are sold. We have also
provided that each of Series A and Series B stockholders have two additional
demand registration rights to register their shares on Form S-3 for each series.
These rights are limited to shares having an excess market value of $500,000. We
have also provided both of these series of holders incidental registration
rights which apply when our company or other stockholders register shares. We
will pay expenses for the demand registration and the two registrations on Form
S-3 for each registrable series, and for the incidental registrations for each
series.

     The agreement provides that, in connection with our initial public
offering, each stockholder agrees not to sell or otherwise dispose of any
securities without the prior written consent of us or the underwriters for a
period of up to 180 days if all other parties having registration rights and all
members of our board and our officers agree to be similarly restricted. The
rights of the holders of registrable shares terminate upon the earlier of five
years from the date of the closing of this offering or as to any single holder
on the date when all of that holder's registrable securities may be sold within
a three month period under Rule 144 of the Securities Act.

LISTING

     Application has been made to include our common stock for quotation in the
Nasdaq National Market under the symbol "CLMX."

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for the common stock is American Stock
Transfer & Trust Company.

                                       61
<PAGE>   64

                        SHARES ELIGIBLE FOR FUTURE SALE

     Prior to this offering, there has been no public market for our common
stock. Future sales of substantial amounts of common stock in the public market,
or the perception that sales could occur, could adversely affect the market
price of our common stock and our ability to sell equity securities.


     Upon completion of this offering, we will have a total of 20,124,002 shares
of common stock outstanding, or 21,024,002 shares if the underwriters exercise
their over-allotment option in full. Of these shares, the 6,000,000 shares sold
in the offering, or 6,900,000 shares if the underwriters exercise their over-
allotment option in full, will be freely tradable unless they are purchased by
our "affiliates," under the Securities Act. The remaining 14,124,002 outstanding
shares are "restricted," which means they were originally sold in offerings that
were not subject to a registration statement filed with the Securities and
Exchange Commission. These restricted shares may be resold only through
registration under the Securities Act unless an exemption from registration is
available, such as the exemption afforded by Rule 144.



     The following table indicates the dates for sale into the public market of
the 14,124,002 shares of our common stock that are not being sold in the
offering but which were outstanding as of August 31, 2000:



<TABLE>
<CAPTION>
 NUMBER OF
   SHARES               AVAILABILITY FOR RESALE INTO PUBLIC MARKET
------------   ------------------------------------------------------------
<C>            <S>
  13,582,702   180 days after the date of this prospectus due to lock-up
               agreements substantially all of our stockholders have
               entered into with Prudential Securities Incorporated (except
               35,320 shares eligible for resale on the date of this
               prospectus)
     541,300   Between 180 and 365 days after the date of this prospectus
               due to requirements of the federal securities laws.
</TABLE>


     We, our directors and officers and stockholders have entered into lock-up
agreements under which we and they have agreed not to offer or sell any shares
of common stock or securities convertible into or exchangeable or exercisable
for shares of common stock for a period of 180 days after the date of this
prospectus without the prior written consent of Prudential Securities
Incorporated, on behalf of the underwriters. Prudential Securities Incorporated
may at any time and without notice, waive any of the terms of these lock-up
agreements specified in the Underwriting Agreement.

     Generally, Rule 144 as currently in effect provides that, beginning 90 days
after the first date of this prospectus, a person who has beneficially owned
shares of our common stock for at least one year would be entitled to sell
within any three-month period, a number of shares that does not exceed the
greater of:


     - 1% of the number of shares of common stock then outstanding, which, based
       on the shares of outstanding as of August 31, 2000 and assuming that the
       underwriters do exercise their over-allotment option, will equal
       approximately 200,000 shares; or


     - the average weekly trading volume of the common stock on the Nasdaq
       National Market during the four calendar weeks preceding the filing of
       the notice on Form 144 with respect to the sale.

     Rule 144 provides limitations in the manner of sales and imposes
requirements as to notice and the availability of current public information
about us.

     Under Rule 144(k), a person who has not been one of our affiliates at any
time during the 90 days preceding a sale, and who has beneficially owned the
shares proposed to be sold for at least two years, may sell his or her shares
without complying with the manner of the sale, public information, volume
limitation or notice provisions of Rule 144. Therefore, unless otherwise
restricted, a person who has been a non-affiliate for at least two years may
sell his or her shares in the open market immediately after the lock-up
agreements expire.

     Rule 701 permits any of our employees, officers, directors or consultants
who purchased their shares under a compensatory stock or option plan or other
written agreement prior to the effective date of this offering to sell such
shares under Rule 144 without complying with the holding period, public
information, volume limitation or notice requirements of Rule 144. All holders
of Rule 701 shares may not sell their

                                       62
<PAGE>   65

Rule 701 shares until 90 days after the date of this prospectus. However,
substantially all shares of our common stock issued under Rule 701 are subject
to lock-up agreements described above.


     Shortly following the date of this prospectus, we intend to file a
registration statement on Form S-8 under the Securities Act covering shares of
our common stock reserved for issuance under our stock option plans. Shares
registered under this registration statement will, subject to Rule 144 volume
limitations applicable to our affiliates, be available for sale in the open
market immediately after the lock-up agreements expire. As of August 31, 2000,
an aggregate of 1,741,477 shares of common stock were subject to outstanding
options.



     As of the close of this offering, holders of 10,641,450 shares of common
stock and warrants exercisable to purchase 1,142,104 shares of common stock will
be entitled to certain rights with respect to the registration of those shares
under the Securities Act. After these shares are registered, they will be freely
tradable. For a description of these rights, see "Description of Capital Stock."


                                       63
<PAGE>   66

                                  UNDERWRITING


     We have entered into an underwriting agreement with the underwriters named
below for whom Prudential Securities Incorporated and ING Barings LLC are acting
as representatives. We are obligated to sell, and the underwriters are obligated
to purchase, all of the shares offered on the cover page of this prospectus, if
any are purchased. Subject to certain conditions of the underwriting agreement,
each underwriter has severally agreed to purchase the shares indicated opposite
its name:



<TABLE>
<CAPTION>
                                                                NUMBER
                                                              OF SHARES
                        UNDERWRITERS                          ----------
<S>                                                           <C>
Prudential Securities Incorporated..........................
ING Barings LLC.............................................

                                                              ----------
     Total..................................................   6,000,000
                                                              ==========
</TABLE>



     The underwriters may sell more shares than the total number of shares
offered on the cover page of this prospectus and they have, for a period of 30
days from the date of this prospectus, an over-allotment option to purchase up
to 900,000 additional shares from us. If any additional shares are purchased,
the underwriters will severally purchase the shares in the same proportion as
per the table above.


     The representatives of the underwriters have advised us that the shares
will be offered to the public at the offering price indicated on the cover page
of this prospectus. The underwriters may allow to selected dealers a concession
not in excess of $     per share and such dealers may reallow a concession not
in excess of $     per share to certain other dealers. After the shares are
released for sale to the public, the representatives may change the offering
price and the concessions.

     We have agreed to pay to the underwriters the following fees, assuming both
no exercise and full exercise of the underwriters' over-allotment option to
purchase additional shares.

<TABLE>
<CAPTION>
                                                                          TOTAL FEES
                                                       -------------------------------------------------
                                             FEE        WITHOUT EXERCISE OF         FULL EXERCISE OF
                                          PER SHARE    OVER-ALLOTMENT OPTION     OVER-ALLOTMENT OPTION
                                          ---------    ---------------------    ------------------------
<S>                                       <C>          <C>                      <C>
Fees paid by us.........................  $                  $                          $
</TABLE>

     In addition, we estimate that we will spend approximately $1,250,000 in
expenses for this offering. We have agreed to indemnify the underwriters against
certain liabilities, including liabilities under the Securities Act, or
contribute to payments that the underwriters may be required to make in respect
of these liabilities.

     We, our officers and directors and substantially all of our stockholders
have entered into lock-up agreements under which we and they have agreed not to
offer or sell any shares of common stock or securities convertible into or
exchangeable or exercisable for shares of common stock for a period of 180 days
from the date of this prospectus without the prior written consent of Prudential
Securities Incorporated, on behalf of the underwriters. Prudential Securities
Incorporated may, at any time and without notice, waive the term of these
lock-up agreements specified in the underwriting agreement.

     Prior to this offering, there has been no public market for the common
stock of Cellomics. The public offering price, negotiated among us and the
representatives, is based upon various factors such as our financial and
operating history and condition, our prospects, the prospects for the industry
we are in and prevailing market conditions.

     Prudential Securities Incorporated, on behalf of the underwriters, may
engage in the following activities in accordance with applicable securities
rules:


     - Create a syndicate short position by making short sales of our common
       stock and may purchase our common stock on the open market to cover
       syndicate short positions created by short sales. Short sales involve the
       sale by the underwriters of a greater number of shares of common stock
       than they


                                       64
<PAGE>   67


are required to purchase in the offering. Short sales can be either "covered" or
"naked". "Covered" short sales are sales made in an amount not greater than the
underwriters' over-allotment option to purchase additional shares in the
      offering. "Naked" short sales are sales in excess of the over-allotment
      option. A naked short position is more likely to be created if the
      underwriters are concerned that there may be downward pressure on the
      price of the common stock in the open market after pricing that could
      adversely affect investors who purchase in the offering.



     - Stabilizing and short covering. Stabilizing bids to purchase the shares
       are permitted if they do not exceed a specified maximum price. Prudential
       Securities Incorporated, on behalf of the underwriters, may close out any
       covered short position by either exercising the over-allotment option or
       purchasing shares in the open market and must close out any naked short
       position by purchasing shares in the open market. In determining the
       source of shares to close out the covered short position, Prudential
       Securities Incorporated, on behalf of the underwriters, will consider,
       among other things, the price of shares available for purchase in the
       open market as compared to the price shares may be purchased through the
       over-allotment option. These activities may cause the price of the shares
       to be higher than would otherwise exist in the open market.



     - Penalty bids permitting the representatives to reclaim concessions from a
       syndicate member of the shares purchased in the stabilizing or short
       covering transactions.


     Such activities, which may be commenced and discontinued at any time, may
be effected on the Nasdaq National Market, in the over-the-counter market or
otherwise.

     Each underwriter has represented that it has complied and will comply with
all applicable laws and regulations in connection with the offer, sale or
delivery of the shares and related offering materials in the United Kingdom,
including:

     - the Public Offers of Securities Regulations 1995;

     - the Financial Services Act 1986; and

     - the Financial Services Act 1986, (Investment Advertisements) (Exemptions)
       Order 1996 (as amended).


     We have asked the underwriters to reserve up to 250,000 shares of the
offering shares for sale at the same offering price directly to our officers,
directors, and other business affiliates or related third parties. The number of
shares available for sale to the general public in the offering will be reduced
to the extent such persons purchase the reserved shares.


     Prudential Securities Incorporated facilitates the marketing of new issues
online through its Prudential Securities.com division. Clients of Prudential
Advisor(SM), a full service brokerage firm program, may view offering terms and
a prospectus online and place orders through their financial advisors.

     Some employees of Prudential Securities Incorporated indirectly own 19,058
shares of our Series B preferred stock. Under the rules of the National
Association of Securities Dealers, Inc., these shares may not be offered or sold
for a period of one year from the date of this prospectus.

                                 LEGAL MATTERS

     Certain legal matters with respect to the legality of the issuance of the
shares of the common stock offered by this prospectus will be passed upon for us
by Buchanan Ingersoll Professional Corporation, Pittsburgh, Pennsylvania.
Certain legal matters in connection with this offering will be passed upon for
the underwriters by Skadden, Arps, Slate, Meagher & Flom (Illinois), Chicago,
Illinois.

                                       65
<PAGE>   68

                                    EXPERTS


     The financial statements as of December 31, 1998 and 1999 and for each of
the three years in the period ended December 31, 1999 included in this
Prospectus and the financial statement schedule included in the Registration
Statement have been so included in reliance on the reports of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.


     Certain legal matters with respect to the statements in this prospectus
under the captions "Risk Factors--The rights we rely on to protect our
intellectual property underlying our products may not be adequate, which could
enable third parties to use our technology and would reduce our ability to
compete in the market," "--Our success will depend partly on our ability to
operate without infringing on or utilizing the proprietary rights of others" and
"Business--Intellectual Property Rights" have been reviewed and approved by
McDonnell Boehnen Hulbert & Berghoff, our patent counsel who are experts in
these matters and are subject to an opinion to be rendered to the underwriters.
We are including this information relying on their review and approval.

                      WHERE YOU CAN FIND MORE INFORMATION

     We have filed with the SEC a registration statement on Form S-1 in
connection with this offering. This prospectus does not contain all the
information in the registration statement. In addition, upon completion of the
offering, we will be required to file annual, quarterly and current reports,
proxy statements and other information with the Securities and Exchange
Commission. Whenever a reference is made in this prospectus to any contract or
other document of ours, the reference may not be complete and you should refer
to the exhibits that are a part of the registration statement for a copy of the
contract or document.

     The registration statement and the exhibits and schedules thereto may be
inspected without charge at the Public Reference Room of the Commission at Room
1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the regional
offices of the Commission located at Seven World Trade Center, Suite 1300, New
York, New York 10048 and Citicorp Center, 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661-2511. Copies of these documents may be obtained from the
Public Reference Room of the Commission at prescribed rates. This material also
may be obtained on the Commission's website at "http://www.sec.gov." Information
regarding the operation of the Public Reference Room may be obtained by calling
the Commission at 1(800) SEC-0330.

     We intend to furnish our stockholders with annual reports containing our
audited financial statements and make available quarterly reports containing
unaudited financial information for the first three quarters of each year.

                                       66
<PAGE>   69

                                CELLOMICS, INC.

                         INDEX TO FINANCIAL STATEMENTS


<TABLE>
<S>                                                           <C>
Report of Independent Accountants...........................  F-2
Balance Sheets as of December 31, 1998 and 1999 and as of
  June 30, 2000.............................................  F-3
Statement of Operations for the years ended December 31,
  1997, 1998 and 1999 and for the six-month periods ended
  June 30, 1999 and 2000....................................  F-4
Statement of Stockholders' Equity for the years ended
  December 31, 1997, 1998 and 1999 and for the six-month
  periods ended June 30, 1999 and 2000......................  F-5
Statement of Cash Flows for the years ended December 31,
  1997, 1998 and 1999 and for the six-month periods ended
  June 30, 1999 and 2000....................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>


                                       F-1
<PAGE>   70

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors
and Stockholders of
Cellomics, Inc.


     The stock split described in Note 14 to the financial statements has not
been consummated at September 1, 2000. When it has been consummated, we will be
in a position to furnish the following report.


        "In our opinion, the accompanying balance sheets and the related
        statements of operations, of stockholders' equity, and of cash flows
        present fairly, in all material respects, the financial position of
        Cellomics, Inc. at December 31, 1998 and 1999, and the results of its
        operations and its cash flows for each of the three years in the period
        ended December 31, 1999, in conformity with accounting principles
        generally accepted in the United States. These financial statements are
        the responsibility of the company's management; our responsibility is to
        express an opinion on these financial statements based on our audits. We
        conducted our audits of these financial statements in accordance with
        auditing standards generally accepted in the United States which require
        that we plan and perform the audit to obtain reasonable assurance about
        whether the financial statements are free of material misstatement. An
        audit includes examining, on a test basis, evidence supporting the
        amounts and disclosures in the financial statements, assessing the
        accounting principles used and significant estimates made by management,
        and evaluating the overall financial statement presentation. We believe
        that our audits provide a reasonable basis for the opinion expressed
        above."

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania

March 3, 2000 except as to the second


paragraph of Note 14 which is


as of July 3, 2000


                                       F-2
<PAGE>   71

                                CELLOMICS, INC.

                                 BALANCE SHEETS




<TABLE>
<CAPTION>
                                                                                             JUNE 30, 2000
                                                   DECEMBER 31,                                PRO FORMA
                                            ---------------------------      JUNE 30,        STOCKHOLDERS'
                                               1998            1999            2000         EQUITY (NOTE 1)
                                            -----------    ------------    ------------    -----------------
                                                                           (UNAUDITED)
<S>                                         <C>            <C>             <C>             <C>
ASSETS
Current assets:
    Cash and cash equivalents...........    $   662,454    $  1,341,333    $    852,306
    Accounts receivable (Note 3)........      1,357,733       1,572,282       2,493,842
    Inventories.........................        335,500         224,536         366,374
    Prepaid expenses and other current
      assets............................        105,267         335,221       1,610,815
                                            -----------    ------------    ------------
Total current assets....................      2,460,954       3,473,372       5,323,337
Property and equipment, net (Note 4)....      1,501,790       2,386,555       2,717,557
                                            -----------    ------------    ------------
Total assets............................    $ 3,962,744    $  5,859,927    $  8,040,894
                                            ===========    ============    ============
LIABILITIES, MANDATORILY REDEEMABLE
  PREFERRED STOCK AND STOCKHOLDERS'
  EQUITY
Current liabilities:
    Accounts payable....................    $   644,429    $  1,341,520    $  1,854,481
    Accrued expenses (Note 5)...........      1,067,099         915,339       1,039,192
    Deferred revenue....................        182,393         528,480         734,659
    Payable to related party (Note
      11)...............................             --       1,000,000       1,000,000
    Current maturities of long-term debt
      (Note 6)..........................        157,626         911,035       1,000,310
                                            -----------    ------------    ------------
Total current liabilities...............      2,051,547       4,696,374       5,628,642
Long-term debt less current maturities
  (Note 6)..............................        653,180       3,744,546       1,623,185
Payable to related party (Note 11)......             --       1,000,000       1,000,000
                                            -----------    ------------    ------------
Total liabilities.......................      2,704,727       9,440,920       8,251,827
                                            -----------    ------------    ------------
Commitments and contingencies (Notes 7
  and 11)...............................             --              --              --
Mandatorily redeemable convertible
  preferred stock (Note 9)..............      6,252,356      12,152,654      20,915,695                --
                                            -----------    ------------    ------------
Stockholders' equity (deficit):
    Common stock, $.01 par value;
      17,660,000 shares authorized,
      December 31, 1998 and 1999;
      21,192,000 shares authorized, June
      30, 2000 and pro forma; 4,076,670,
      4,183,015 and 4,183,015 shares
      issued and outstanding, December
      31, 1998 and 1999 and June 30,
      2000; 13,579,170 shares issued and
      outstanding, pro forma............         40,767          41,830          41,830           135,791
    Additional paid-in capital..........      1,667,537       3,034,395      10,627,885        29,572,689
    Deferred compensation (Note 9)......       (188,102)     (1,677,528)     (5,920,263)       (5,920,263)
    Accumulated deficit.................     (6,514,541)    (17,132,344)    (25,876,080)      (25,876,080)
                                            -----------    ------------    ------------       -----------
Total stockholders' equity (deficit)....     (4,994,339)    (15,733,647)    (21,126,628)       (2,087,863)
                                            -----------    ------------    ------------       ===========
Total liabilities, mandatorily
  redeemable preferred stock and
  stockholders' equity..................    $ 3,962,744    $  5,859,927    $  8,040,894
                                            ===========    ============    ============
</TABLE>


      The accompanying notes are an integral part of these financial statements
                                       F-3
<PAGE>   72

                                CELLOMICS, INC.

                            STATEMENT OF OPERATIONS




<TABLE>
<CAPTION>
                                                                                        SIX MONTHS ENDED
                                                                                            JUNE 30,
                                                                                   --------------------------
                                           1997          1998           1999          1999           2000
                                        -----------   -----------   ------------   -----------   ------------
                                                                                          (UNAUDITED)
<S>                                     <C>           <C>           <C>            <C>           <C>
Revenues:
    Product sales.....................  $        --   $        --   $  1,350,041   $        --   $  3,055,604
    Development and collaboration
      agreement and grant revenues....      394,935     2,273,082      2,040,410     1,114,614        931,214
                                        -----------   -----------   ------------   -----------   ------------
         Total revenues...............      394,935     2,273,082      3,390,451     1,114,614      3,986,818
                                        -----------   -----------   ------------   -----------   ------------
Operating costs and expenses:
    Costs of product sales (including
      related party amounts of
      $100,697 in 1999; see Note 11)..           --            --        404,785            --      1,209,017
    Research and development
      (including related party amounts
      of $2,165,334 in 1999; see
      Note 11)........................    1,486,156     3,948,309      9,509,177     3,974,754      6,247,947
    Selling, general and
      administrative (including
      related party amounts of
      $10,809, $168,998 and $110,617
      in 1997, 1998 and 1999; see
      Note 11)........................    1,334,014     1,834,044      3,933,687     1,845,794      3,387,059
                                        -----------   -----------   ------------   -----------   ------------
         Total operating costs and
           expenses...................    2,820,170     5,782,353     13,847,649     5,820,548     10,844,023
                                        -----------   -----------   ------------   -----------   ------------
Loss from operations..................   (2,425,235)   (3,509,271)   (10,457,198)   (4,705,934)    (6,857,205)
Interest income (expense):
    Interest expense..................      (37,950)      (43,944)      (302,040)      (67,034)    (1,981,980)
    Interest income...................       25,309        58,555        141,435       169,902         95,452
                                        -----------   -----------   ------------   -----------   ------------
Loss before income taxes..............   (2,437,876)   (3,494,660)   (10,617,803)   (4,603,066)    (8,743,733)
Provision for income taxes (Note 8)...           --            --             --            --             --
                                        -----------   -----------   ------------   -----------   ------------
Net loss..............................   (2,437,876)   (3,494,660)   (10,617,803)   (4,603,066)    (8,743,733)
Accrued and deemed dividends and
  accretion on mandatorily redeemable
  convertible preferred stock.........           --      (518,017)      (933,232)     (454,204)    (7,120,618)
                                        -----------   -----------   ------------   -----------   ------------
Net loss attributable to common
  stockholders........................  $(2,437,876)  $(4,012,677)  $(11,551,035)  $(5,057,270)  $(15,864,351)
                                        ===========   ===========   ============   ===========   ============
Net loss per share - basic and diluted
  (Note 10)...........................  $     (0.61)  $     (0.99)  $      (2.77)  $     (1.21)  $      (3.79)
                                        ===========   ===========   ============   ===========   ============
Shares used to compute basic and
  diluted net loss per share..........    3,986,392     4,069,726      4,174,835     4,167,823      4,183,015
                                        ===========   ===========   ============   ===========   ============
Pro forma net loss per share
  (Note 10)...........................                              $      (0.97)                $      (0.67)
                                                                    ============                 ============
Shares used to compute pro forma net
  loss per share......................                                10,989,999                   13,029,661
                                                                    ============                 ============
</TABLE>


      The accompanying notes are an integral part of these financial statements

                                       F-4
<PAGE>   73

                                CELLOMICS, INC.

                       STATEMENT OF STOCKHOLDERS' EQUITY




<TABLE>
<CAPTION>
                                     COMMON STOCK       ADDITIONAL      DEFERRED                        TOTAL
                                  -------------------     PAID-IN        STOCK       ACCUMULATED    STOCKHOLDERS'
                                   SHARES     AMOUNT      CAPITAL     COMPENSATION     DEFICIT         EQUITY
                                  ---------   -------   -----------   ------------   ------------   -------------
<S>                               <C>         <C>       <C>           <C>            <C>            <C>
  Balance at January 1, 1997....  3,986,392   $39,864   $ 1,927,113   $        --    $   (582,005)  $  1,384,972
Net loss........................         --        --            --            --      (2,437,876)    (2,437,876)
                                  ---------   -------   -----------   -----------    ------------   ------------
  Balance at December 31,
    1997........................  3,986,392    39,864     1,927,113            --      (3,019,881)    (1,052,904)
Issuance of common stock for
  anti-dilution rights..........     90,278       903          (903)           --              --             --
Issuance of stock options to
  employees.....................         --        --       259,344      (259,344)             --             --
Amortization of deferred
  compensation..................         --        --            --        71,242              --         71,242
Accrued dividends and accretion
  on mandatorily redeemable
  convertible preferred stock...         --        --      (518,017)           --              --       (518,017)
Net loss........................         --        --            --            --      (3,494,660)    (3,494,660)
                                  ---------   -------   -----------   -----------    ------------   ------------
  Balance at December 31,
    1998........................  4,076,670    40,767     1,667,537      (188,102)     (6,514,541)    (4,994,339)
Issuance of common stock for
  anti-dilution rights..........    106,345     1,063        (1,063)           --              --             --
Issuance of stock purchase
  warrants......................         --        --       121,847            --              --        121,847
Issuance of stock options to
  employees.....................         --        --     2,179,306    (2,179,306)             --             --
Amortization of deferred
  compensation..................         --        --            --       689,880              --        689,880
Accrued dividends and accretion
  on mandatorily redeemable
  convertible preferred stock...         --        --      (933,232)           --              --       (933,232)
Net loss........................         --        --            --            --     (10,617,803)   (10,617,803)
                                  ---------   -------   -----------   -----------    ------------   ------------
  Balance at December 31,
    1999........................  4,183,015    41,830     3,034,395    (1,677,528)    (17,132,344)   (15,733,647)
Issuance of stock purchase
  warrants (unaudited)..........         --        --     1,716,054            --              --      1,716,054
Issuance of stock options to
  employees (unaudited).........         --        --     6,467,182    (6,467,182)             --             --
Amortization of deferred
  compensation (unaudited)......         --        --            --     2,224,447              --      2,224,447
Accrued and deemed dividends and
  accretion on mandatorily
  redeemable convertible
  preferred stock (unaudited)...         --        --      (589,746)           --              --       (589,746)
Net loss (unaudited)............         --        --            --            --      (8,743,736)    (8,743,736)
                                  ---------   -------   -----------   -----------    ------------   ------------
  Balance at June 30, 2000
    (unaudited).................  4,183,015   $41,830   $10,627,885   $(5,920,263)   $(25,876,080)  $(21,126,628)
                                  =========   =======   ===========   ===========    ============   ============
</TABLE>


      The accompanying notes are an integral part of these financial statements
                                       F-5
<PAGE>   74

                                CELLOMICS, INC.

                            STATEMENT OF CASH FLOWS




<TABLE>
<CAPTION>
                                                                                                   FOR THE SIX MONTHS
                                                                                                     ENDED JUNE 30,
                                                       1997          1998           1999          1999           2000
                                                    -----------   -----------   ------------   -----------   ------------
                                                                                                      (UNAUDITED)
<S>                                                 <C>           <C>           <C>            <C>           <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss........................................  $(2,437,876)  $(3,494,660)  $(10,617,803)  $(4,603,066)  $ (8,743,736)
  Adjustments to reconcile net loss to net cash
    used in operating activities:
      Depreciation and amortization...............       79,475       143,487        486,008       170,685        419,063
      Amortization of deferred compensation.......           --        71,242        689,880       237,821      2,224,447
      Interest charge related to convertible
        notes.....................................           --            --             --            --      1,716,054
    Increase (decrease) in cash from changes in:
      Accounts receivable.........................      158,722    (1,357,733)      (214,549)      (29,026)      (921,560)
      Inventories.................................     (119,770)     (215,730)      (147,036)     (413,749)      (141,839)
      Prepaid expenses and other current assets...      (33,045)      (67,473)      (241,711)      (63,931)    (1,327,569)
      Accounts payable and accrued expenses.......      538,644       883,600        545,331       (49,448)       678,677
      Payable to related party....................           --            --      2,000,000     1,000,000             --
      Deferred revenue............................      450,000      (267,607)       346,087       (91,805)       206,179
                                                    -----------   -----------   ------------   -----------   ------------
        Net cash used in operating activities.....   (1,363,850)   (4,304,874)    (7,153,793)   (3,842,519)    (5,890,284)
                                                    -----------   -----------   ------------   -----------   ------------
CASH FLOWS FROM INVESTING ACTIVITIES:
    Capital expenditures..........................     (205,421)   (1,377,681)    (1,070,554)     (630,056)      (619,021)
                                                    -----------   -----------   ------------   -----------   ------------
        Net cash used in investing activities.....     (205,421)   (1,377,681)    (1,070,554)     (630,056)      (619,021)
                                                    -----------   -----------   ------------   -----------   ------------
CASH FLOWS FROM FINANCING ACTIVITIES:
    Proceeds from sale of mandatorily redeemable
      convertible preferred stock.................           --     5,214,788      4,967,066     4,967,066      6,380,124
    Proceeds from issuance of convertible notes
      and stock purchase warrants.................      500,000            --      1,800,000            --             --
    Borrowings under term note and equipment
      financing facilities........................           --       879,762      2,415,952       644,601        104,756
    Repayment of term note and equipment financing
      facilities borrowings.......................           --       (68,956)      (279,792)     (111,229)      (464,602)
                                                    -----------   -----------   ------------   -----------   ------------
        Net cash provided by financing
          activities..............................      500,000     6,025,594      8,903,226     5,500,438      6,020,278
                                                    -----------   -----------   ------------   -----------   ------------
Net (decrease) increase in cash and cash
  equivalents.....................................   (1,069,271)      343,039        678,879     1,027,863       (489,027)
CASH AND CASH EQUIVALENTS:
    Beginning of period...........................    1,388,686       319,415        662,454       662,454      1,341,333
                                                    -----------   -----------   ------------   -----------   ------------
    End of period.................................  $   319,415   $   662,454   $  1,341,333   $ 1,690,317   $    852,306
                                                    ===========   ===========   ============   ===========   ============
SUPPLEMENTAL CASH FLOW INFORMATION:
    Cash paid for interest........................  $        --   $    17,487   $    252,794   $    67,034   $    154,462
                                                    ===========   ===========   ============   ===========   ============
NON-CASH TRANSACTIONS:
    Conversion of notes and accrued interest to
      mandatorily redeemable convertible preferred
      stock.......................................  $        --   $   519,550   $         --   $        --   $  1,841,863
                                                    ===========   ===========   ============   ===========   ============
    Accrued and deemed dividends and accretion on
      mandatorily redeemable convertible preferred
      stock.......................................  $        --   $   518,017   $    933,232   $   454,204   $  7,120,618
                                                    ===========   ===========   ============   ===========   ============
    Deferred compensation on options granted to
      employees...................................  $        --   $   259,344   $  2,179,319   $   250,176   $  6,467,182
                                                    ===========   ===========   ============   ===========   ============
</TABLE>


      The accompanying notes are an integral part of these financial statements
                                       F-6
<PAGE>   75

                                CELLOMICS, INC.


                         NOTES TO FINANCIAL STATEMENTS
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED


                      JUNE 30, 1999 AND 2000 IS UNAUDITED)


1.   ORGANIZATION AND BASIS OF PRESENTATION

     Organization

     Cellomics, Inc. (the "Company" or "Cellomics") was incorporated in Delaware
     on January 16, 1998 as the successor company to BioDx Inc. which was formed
     on May 3, 1995. Cellomics is in the business of extending the power of
     genomics and proteomics by defining the cellular functions of genes and
     proteins in order to make life sciences research, including drug discovery,
     more productive and cost effective. Cellomics offers an array of products
     designed to seamlessly integrate the generation of data to the extraction
     of information, and ultimately create cellular knowledge. Cellomics
     generates cellular data using its proprietary portfolio of instruments,
     assays and reagents. The data generated is then stored, managed and
     analyzed using its proprietary information products. Cellomics uses its
     information products, coupled with internally and externally generated
     informatics, to build a virtual cell which maps the complex interactive
     network of cellular components and their interactions, thereby generating
     knowledge. Cellomics knowledge products aim to systematize, in a
     searchable, electronic format, our continuously evolving understanding of
     cellular biology.


     The Company will require additional financing to fund currently planned
     operating levels in 2000. In the event an initial public offering of common
     stock is not completed as planned, management will pursue a number of
     alternative sources to secure their funding. These alternatives include
     additional private placements of equity or debt securities or strategic
     equity investments. In addition, certain Series A preferred stockholders
     have committed to provide funding of up to $2.0 million. In the event that
     these sources are not sufficient or available when needed, management will
     curtail certain activities, including various research and development
     programs.



     Initial Public Offering



     On March 1, 2000, the Company's board of directors approved management's
     plans to file a registration statement for its initial public offering with
     the Securities and Exchange Commission in March 2000 and to complete its
     initial public offering during the fourth quarter of 2000. Anticipated
     proceeds from the initial public offering will be used to continue to fund
     the growth of the business. There is no assurance that the planned initial
     public offering will be successfully completed.



     Unaudited Pro Forma Stockholders' Equity



     If the initial public offering is consummated as presently anticipated, all
     shares of Series A and Series B preferred stock (see Note 9) will
     automatically convert into an equal number of shares of common stock. The
     unaudited pro forma stockholders' equity reflects the subsequent conversion
     of Series A and Series B preferred stock into common stock as if such
     conversion had occurred as of June 30, 2000. The unaudited pro forma
     stockholders' equity does not include the sale of 541,300 shares of our
     common stock which occurred on July 3, 2000 (see Note 14).



     Unaudited Interim Financial Statements



     The unaudited balance sheet as of June 30, 2000, the unaudited statement of
     stockholders' equity for the six-month period ended June 30, 2000 and the
     unaudited statements of operations and cash flows for the six-month periods
     ended June 30, 1999 and 2000, in the opinion of management, have been
     prepared on the same basis as the accompanying audited financial
     statements, and include all adjustments necessary for the fair presentation
     of the results of the interim period. All adjustments reflected in the
     interim financial statements are of a normal recurring nature. The data
     disclosed in the notes to the interim


                                       F-7
<PAGE>   76
                                CELLOMICS, INC.


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED


                      JUNE 30, 1999 AND 2000 IS UNAUDITED)



     financial statements for these periods are also unaudited. As permitted
     under Article 10 of Regulation
     S-X, the notes to these financial statements do not include certain
     disclosures relating to the interim periods.


2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES


     Cash and Cash Equivalents


     Highly liquid investments with an original maturity of 90 days or less are
     classified as cash equivalents. The Company's cash and cash equivalents are
     maintained in deposit accounts, certificates of deposit and money market
     accounts.

     Concentrations of Credit Risks

     Substantially all of the Company's cash and cash equivalents are maintained
     at one financial institution.


     The Company's accounts receivable are primarily from the United States
     government and pharmaceutical customers located in the United States and
     the United Kingdom. During fiscal years 1997 and 1998, approximately 97%
     and 60% of revenues were concentrated with three customers. During fiscal
     year 1999, approximately 93% of revenues was concentrated with four
     customers.


     Inventories

     Inventories, which consist primarily of microscope and camera components
     used in the Company's high content screening instrumentation platform, are
     stated at the lower of average cost or market.

     Income Taxes

     Deferred income taxes are recorded using the liability method. Under this
     method, deferred tax assets and liabilities are determined based on the
     differences between the financial statement and tax bases of assets and
     liabilities using enacted tax rates in effect in the years in which the
     differences are expected to reverse. Valuation allowances are established
     when necessary to reduce deferred tax assets to the amount expected to be
     realized.

     Property and Equipment

     Property and equipment is carried at cost. Depreciation is computed using
     the straight-line method over the estimated useful lives of the assets,
     generally ranging from three years for software and up to seven years for
     furniture and fixtures. Repairs and maintenance are charged to expense as
     incurred.

     Certain laboratory and computer equipment used by the Company could be
     subject to technological obsolescence in the event that significant
     advancement is made in competing or developing equipment technologies.
     Management continually reviews the estimated useful lives of
     technologically sensitive equipment and believes that those estimates
     appropriately reflect the current useful life of its assets. In the event
     that a currently unknown significantly advanced technology became
     commercially available, the Company would re-evaluate the value and
     estimated useful lives of its existing equipment, possibly having a
     material impact on the financial statements.

     The Company periodically reviews all long-lived assets for impairment.
     Assets are written down to the fair market value when the carrying costs
     exceed the gross undiscounted cash flows expected to be generated by such
     assets. To date, there have been no asset impairments that would warrant a
     write-down.
                                       F-8
<PAGE>   77
                                CELLOMICS, INC.


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED


                      JUNE 30, 1999 AND 2000 IS UNAUDITED)


     Revenue Recognition

     Revenue from product sales is recognized upon shipment of the product to
     the customer. Revenue from service contracts are recorded as deferred
     service contract revenues and reflected in product revenues over the term
     of the contract, generally one year.

     The Company recognizes development and collaboration agreement and grant
     revenues on a straight-line basis over the contract period or as work is
     performed. Billings, and revenue recognition, under the Company's
     collaboration and grant arrangements generally coincide with the work
     performed and costs incurred. However, when payment for revenues under
     these agreements is received in advance of the services performed, the
     company records deferred revenue related to these agreements. Revenue
     recognized under collaboration agreements and grants are non-refundable.

     In connection with some development and collaboration agreements, prototype
     products are also sold to customers. Such prototypes are priced separately
     from the underlying development and collaboration agreements. Revenue
     related to the prototype is recognized when the prototype is shipped to the
     customer in accordance with the collaboration agreement and is included in
     development and collaboration agreement and grant revenue.

     Advertising


     Media placement costs are expensed in the month that the advertising
     appears. Total advertising expenses were $118,616 in 1999. No advertising
     costs were incurred in 1997 and 1998.


     Research and Development

     Research and development costs are expensed as incurred.

     Software Development Costs

     Software development costs incurred subsequent to the establishment of
     technological feasibility are capitalized in accordance with Statement of
     Financial Standards ("SFAS") No. 86, "Accounting for the Costs of Computer
     Software to Be Sold, Leased, or Otherwise Marketed." Amortization of
     capitalized software development costs is the greater of the amount
     computed using (a) the ratio of current revenues to the total of current
     and anticipated future revenues or (b) the straight-line method over the
     estimated economic life of the product. To date, the period of time, and
     accordingly, costs incurred between the achievement of technological
     feasibility and availability for general release, are not significant. As
     such, no amounts have been capitalized to date.

     In March 1998, the AICPA issued Statement of Position 98-1, "Accounting for
     the Cost of Computer Software Developed or Obtained for Internal Use" ("SOP
     98-1"). SOP 98-1 requires entities to capitalize certain costs related to
     internal use software once certain criteria have been met. The Company
     adopted the provisions of SOP 98-1 on January 1, 1999. To date, the Company
     has not capitalized any costs related to internal use software.

     Stock-Based Compensation

     As permitted by the provisions of SFAS No. 123, "Accounting for Stock-Based
     Compensation" (SFAS No. 123), the Company has elected to measure
     stock-based compensation under the provisions of Accounting Principles
     Board Opinion No. 25, "Accounting for Stock Issued to Employees" (APB No.
     25), and to adopt the disclosure-only alternative described in SFAS No.
     123. For stock options

                                       F-9
<PAGE>   78
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

granted at exercise prices less than fair value, the Company records deferred
stock-based compensation. Such deferred stock-based compensation is amortized
     over the vesting period of each individual award using the accelerated
     basis in accordance with Financial Accounting Standards Board ("FASB")
     Interpretation No. 28.

Foreign Currency

Foreign currency transaction gains and losses are included in other income in
the statement of operations during the period in which they arise.

Use of Estimates

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
     affect the reported amounts of assets and liabilities and the disclosure of
     contingent assets and liabilities at the date of the financial statements.
     Estimates also affect the amounts of revenues and expenses during the
     reported periods. Actual results could differ from the estimates.

Comprehensive Income (Loss)


During 1997, 1998, 1999 and for the six months ended June 30, 1999 and 2000, the
Company had no other comprehensive income items. Accordingly, the comprehensive
     loss for each of these periods is equal to the net loss.


Recent Accounting Pronouncements

In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities," which provides a comprehensive and
     consistent standard for the recognition and measurement of derivatives and
     hedging activities. Under the statement, every derivative is recorded in
     the balance sheet as either an asset or liability measured at its fair
     value. The statement requires that changes in the fair value of a
     derivative be recognized currently in earnings unless specific hedge
     accounting criteria are met. SFAS No. 133 is effective for fiscal years
     beginning after June 15, 2000 and is not anticipated to have a material
     impact on our results of operations or financial position.


In December 1999, the SEC issued Staff Accounting Bulletin 101, or SAB 101,
Revenue Recognition, which outlines the basic criteria that must be met to
     recognize revenue and provides guidance for presentation of revenue and for
     disclosure related to revenue recognition policies in financial statements
     filed with the SEC. The adoption of SAB 101 did not have a material impact
     on our financial position and results of operations.



In March 2000, the FASB issued Interpretation No. 44 (or FIN 44) "Accounting for
Certain Transactions Involving Stock Compensation - an Interpretation of APB
     25". This Interpretation clarifies (a) the definition of employee for
     purposes of applying APB 25, (b) the criteria for determining whether a
     plan qualifies as a noncompensatory plan, (c) the accounting consequence of
     various modifications to the terms of a previously fixed stock option or
     award, and (d) the accounting for an exchange of stock compensation awards
     in a business combination. This Interpretation is effective July 1, 2000,
     but certain conclusions in this Interpretation cover specific events that
     occur after either December 15, 1998, or January 12, 2000. The adoption of
     certain of the conclusions of FIN 44 covering events occurring during the
     period after December 15, 1998 or January 12, 2000 did not have a material
     effect on the Company's financial position and results of operations. The
     Company does not expect that the adoption


                                      F-10
<PAGE>   79
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)


of the remaining conclusions will have a material effect on the financial
position and results of operations.


3.   ACCOUNTS RECEIVABLE

     Accounts receivable consisted of:


<TABLE>
<CAPTION>
                                                       DECEMBER 31,
                                                 ------------------------     JUNE 30,
                                                    1998          1999          2000
                                                 ----------    ----------    ----------
<S>                                              <C>           <C>           <C>
Product receivables............................  $       --    $1,233,995    $1,939,596
Development and collaboration agreement
  receivables..................................     919,338            --            --
Grant receivables..............................     438,395       338,287       554,246
                                                 ----------    ----------    ----------
                                                 $1,357,733    $1,572,282    $2,493,842
                                                 ==========    ==========    ==========
</TABLE>


4.   PROPERTY AND EQUIPMENT

     Property and equipment consisted of:


<TABLE>
<CAPTION>
                                                       DECEMBER 31,
                                                 ------------------------     JUNE 30,
                                                    1998          1999          2000
                                                 ----------    ----------    ----------
<S>                                              <C>           <C>           <C>
Computer equipment and software................  $  471,672    $  930,930    $1,222,348
Laboratory equipment...........................   1,172,083     1,894,762     2,115,427
Furniture and fixtures.........................     137,152       208,820       243,885
Leased assets and leasehold improvements.......          --        74,950       176,615
                                                 ----------    ----------    ----------
     Property and equipment, cost..............   1,780,907     3,109,462     3,758,275
Less: accumulated depreciation.................     279,117       722,907     1,040,718
                                                 ----------    ----------    ----------
     Net property and equipment................  $1,501,790    $2,386,555    $2,717,557
                                                 ==========    ==========    ==========
</TABLE>


    During 1999, $258,000 of inventory was transferred to property and
equipment.

5.   ACCRUED EXPENSES

     Accrued expenses consisted of:


<TABLE>
<CAPTION>
                                                       DECEMBER 31,
                                                  ----------------------     JUNE 30,
                                                     1998         1999         2000
                                                  ----------    --------    ----------
<S>                                               <C>           <C>         <C>
Incentive compensation and other employee
  costs.........................................  $  275,000    $422,081    $  412,503
Professional services...........................     420,634      98,500       291,000
Due to subcontractors...........................     158,986     191,119        31,678
Other...........................................     212,479     203,639       304,011
                                                  ----------    --------    ----------
                                                  $1,067,099    $915,339    $1,000,081
                                                  ==========    ========    ==========
</TABLE>


                                      F-11
<PAGE>   80
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

6.   LONG-TERM DEBT

     Long-term debt consisted of:


<TABLE>
<CAPTION>
                                                       DECEMBER 31,
                                                  ----------------------     JUNE 30,
                                                    1998         1999          2000
                                                  --------    ----------    ----------
<S>                                               <C>         <C>           <C>
Equipment financing line of credit - 1998.......  $810,806    $1,185,975    $1,037,735
Equipment financing line of credit - 1999.......        --       209,277       269,950
Senior term loan................................        --     1,499,523     1,237,607
Convertible notes payable to related parties....        --     1,708,615            --
Capital lease obligations.......................        --        52,191        78,202
                                                  --------    ----------    ----------
     Total long-term debt and capital lease
       obligations..............................   810,806     4,655,581     2,623,494
     Less: current maturities...................   157,626       911,035     1,000,310
                                                  --------    ----------    ----------
Long-term debt less current maturities..........  $653,180    $3,744,546    $1,623,185
                                                  ========    ==========    ==========
</TABLE>


    On September 11, 1998, the Company entered into a $1.5 million non-revolving
    equipment financing line of credit agreement (the "1998 Equipment Financing
    Line"). Borrowings against the 1998 Equipment Financing Line can be in
    increments of not less than $75,000 in the form of a note and are
    collateralized by the equipment purchased. The notes are payable in 48 equal
    monthly installments with a 10% balloon payment at the end of the term and
    bear interest ranging from 12.7% to 12.9%. Borrowings under this facility
    are fully utilized.

    On June 30, 1999, the Company entered into a $1.5 million Senior Term Debt
    Financing Facility (the "Term Debt Agreement") that is collateralized by all
    of the Company's assets except for $5.0 million of existing or future
    financed equipment. The borrowings may be used for working capital purposes
    and have a six-month interest-only period followed by 30 equal monthly
    installments of principal and interest. The note bears interest at 12.5%.


    On July 21, 1999, the Company entered into a $3.0 million non-revolving
    equipment financing line of credit agreement (the "1999 Equipment Financing
    Line"). Borrowings against the 1999 Equipment Financing Line are
    collateralized by the equipment purchased. The notes are payable in 48 equal
    monthly installments. Available borrowings remaining under this facility at
    December 31, 1999 and June 30, 2000 are $2,773,345 and $2,678,962,
    respectively. The notes bear interest ranging from 11.0% to 12.0%.



    As of December 31, 1999, the scheduled maturities of the lines of credit,
    the senior term loan and the capital leases during each of the next five
    years were $911,035 in 2000, $1,036,262 in 2001, $839,623 in 2002, $160,046
    in 2003 and $0 in 2004.



    On November 30, 1999, certain Series A preferred stockholders loaned $1.8
    million in convertible demand notes ("Convertible Demand Notes") to the
    Company. The Convertible Demand Notes bear interest at 10% per annum. In
    connection with the Convertible Demand Notes, the holders received common
    stock purchase warrants. The total proceeds of $1.8 million were allocated
    between the notes and the warrants based upon their relative fair values at
    the date of issuance. The resulting discount of $121,847 on the convertible
    notes was amortized to interest expense over the period from November 30,
    1999 to April 1, 2000. Also, in connection with the sale of the Series B
    preferred stock, the Company issued additional common stock purchase
    warrants to the convertible demand noteholders. The issuance of these
    warrants resulted in an additional non-cash interest charge of $1.7 million
    related to the Convertible Demand Notes during the first half of 2000. The
    convertible notes were converted into Series B preferred stock on February
    23, 2000 (see Note 9).


                                      F-12
<PAGE>   81
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

7.   COMMITMENTS


     The Company leases office space and office equipment under operating leases
     expiring through 2001. Total rent expense amounted to $95,758, $176,998,
     $292,655, $139,009 and $184,754 for 1997, 1998, 1999 and for the six months
     ended June 30, 1999 and 2000, respectively. Minimum lease commitments for
     facilities and equipment as of December 31, 1999 were as follows:


<TABLE>
<CAPTION>
                                                              CAPITAL     OPERATING
YEAR                                                           LEASES      LEASES
----                                                          --------    ---------
<S>                                                           <C>         <C>
2000........................................................  $ 20,405    $342,099
2001........................................................    20,329     173,981
2002........................................................    14,375          --
2003........................................................     9,176          --
2004........................................................        --          --
                                                              --------    --------
     Total minimum lease payments...........................  $ 64,285    $516,080
                                                                          ========
     Less: amounts representing interest....................   (12,094)
                                                              --------
     Present value of minimum capital lease payments........  $ 52,191
                                                              ========
</TABLE>

     The Company has other commitments in the ordinary course of business
     totaling approximately $375,000 during 2000.

8.   INCOME TAXES


     As of December 31, 1999, the Company had federal and state net operating
     loss carryforwards totaling approximately $15.5 million. The Company also
     had research and development tax credit carryforwards of approximately
     $725,000. The federal net operating loss and credit carryforwards will
     expire at various dates beginning in the year 2015 through 2019, if not
     utilized. The Commonwealth of Pennsylvania net operating losses will expire
     at various dates beginning in 2005 through 2009, if not utilized.


     Utilization of the Company's net operating loss carryforwards and credits
     may be subject to an annual limitation due to the change in ownership
     provisions of the Internal Revenue Code of 1986 and similar state
     provisions. The annual limitation may result in the expiration of net
     operating losses and credits before utilization.

    Deferred income taxes reflect the net tax effects of temporary differences
    between the carrying amounts of assets for financial reporting and the
    amount used for income tax purposes. Significant components of the Company's
    deferred taxes for federal and state income taxes are as follows:


<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                            --------------------------
                                                               1998           1999
                                                            -----------    -----------
<S>                                                         <C>            <C>
Deferred tax assets (liabilities):
     Net operating loss carryforwards.....................  $ 2,719,358    $ 7,066,305
     Research and development credits.....................      282,995        703,469
     Other, net...........................................      (10,021)        51,380
                                                            -----------    -----------
Total deferred tax assets.................................    2,992,332      7,821,154
Valuation allowance.......................................   (2,992,332)    (7,821,154)
                                                            -----------    -----------
Net deferred tax assets...................................  $        --    $        --
                                                            ===========    ===========
</TABLE>


                                      F-13
<PAGE>   82
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)


   The net valuation allowance increased by $1.9 million and $4.1 million for
   the fiscal years ended December 31, 1998 and 1999, respectively, principally
   due to the Company's operating losses. Management believes that there is
   sufficient uncertainty regarding the realization of deferred tax assets such
   that a full valuation allowance is appropriate.


9.   MANDATORILY REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
     (ALL SHARE AND PER SHARE AMOUNTS STATED ON A POST-SPLIT EQUIVALENT BASIS,
     SEE NOTE 14)

     Mandatorily Redeemable Convertible Preferred Stock


     On January 8, 1998, the Company's board of directors authorized 7,150,534
     shares of $.01 par value preferred stock. On February 23, 2000, the number
     of authorized shares was increased to 9,622,934.


     On January 21, 1998, through a private placement offering, the Company,
     issued 3,477,222 shares of Series A Mandatorily Redeemable Convertible
     Preferred Stock ("Series A Preferred Stock") for gross proceeds of $5.5
     million. Additionally, the holders of $500,000 of outstanding convertible
     notes converted the notes plus accrued interest of $19,550 for 326,523
     shares of Series A Preferred Stock. On January 15, 1999, the Company
     received a second investment related to the January 21, 1998 private
     placement offering. The second investment resulted in the issuance of an
     additional 3,142,350 shares of Series A Preferred Stock for gross proceeds
     of $5 million.


     On February 23, 2000, the Company issued 1,911,102 shares of Series B
     mandatorily redeemable convertible preferred stock for gross proceeds of
     $6.5 million. In addition, $1.8 million of Convertible Demand Notes (see
     Note 6), plus accrued interest of $41,868, converted by their original
     terms and conditions into 538,958 shares of Series B Preferred Stock. The
     Series B convertible preferred stock contains a beneficial conversion
     feature resulting in a one-time non-cash deemed dividend of $6.5 million
     which has been recorded in the six-month period ended June 30, 2000 by
     offsetting charges and credits to additional paid-in capital. Although this
     deemed dividend increased the loss attributable to common stockholders in
     the calculation of basic net loss per share for the six month period ended
     June 30, 2000, it has no effect on total stockholders' equity.



     Series A and Series B Preferred Stock is convertible into common stock on a
     one for one basis. Shares of Series A and Series B Preferred Stock have
     voting rights equal to common stock on an as-if-converted basis. Shares of
     Series A Preferred Stock are automatically converted into shares of common
     stock at the closing of an initial public offering at a price per share to
     the public of at least three times the original Series A Preferred Stock
     conversion price per share, as defined, and which results in gross proceeds
     to the Company of at least $15.0 million. Shares of Series B Preferred
     Stock are automatically converted into shares of common stock at the
     closing of an initial public offering at a price per share, to the public,
     of at least two and one-half times the original Series B Preferred Stock
     conversion price per share, as defined, and which results in gross proceeds
     to the Company of at least $20 million.



     The Series A and Series B preferred stockholders are entitled to receive
     annual dividends at a rate of 8%. Dividends shall accrue on each share
     beginning on the date of issuance and shall be payable each January 1 for
     the period then ended. Dividends, which to date have not been declared or
     paid, may be settled either in cash, or in common stock at the option of
     the Company. At December 31, 1998 and 1999 and June 30, 2000, cumulative
     dividends due Series A and Series B preferred stockholders were equal to
     $458,067, $1.3 million and $1.9 million, respectively. In addition, costs
     related to the issuance of the Series A and Series B Preferred Stock were
     recorded as a discount from the redemption value and are being accreted
     through periodic charges in a manner similar to the accrued dividends over
     the period


                                      F-14
<PAGE>   83
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

up to the date of redemption. The cumulative dividends and the accreted
redemption value are included in the carrying amount of mandatorily redeemable
     convertible preferred stock.


Series A preferred stockholders are entitled to receive, upon liquidation, a
distribution of $1.59 per share, the issuance price, plus any accrued dividends
     in preference to the Common stockholders. Series B preferred shareholders
     are entitled to receive, upon liquidation, a distribution of $3.42 per
     share, the issuance price, plus any accrued dividends in preference to the
     Common stockholders. Thereafter, the remaining assets and funds, if any,
     shall be distributed ratably on a per share basis among all preferred and
     common stockholders.



At any time subsequent to January 21, 2003, the Company is required to redeem,
upon written request from the holders of a majority of the then outstanding
     shares of Series A and Series B Preferred Stock, all of the outstanding
     shares of Series A and Series B Preferred Stock by paying in cash the sum
     of $1.59 and $3.42 per share, respectively, the issuance price, plus any
     accrued and unpaid dividends. Redemption occurs in four equal installments
     beginning on the initial date of redemption and three successive
     anniversary dates thereafter.



The Series A and Series B preferred stockholders have anti-dilution price
protection and certain preemptive rights to participate in the issuance of new
     securities. These rights terminate upon conversion.


Common Stock

On January 8, 1998, the number of authorized shares of common stock was
decreased from 353,200,000 to 17,660,000. On February 23, 2000, the number of
     authorized shares of common stock was increased to 21,192,000.

Carl Zeiss, Inc. ("Carl Zeiss"), an existing stockholder, received a total of
196,623 shares of common stock in 1998 and 1999 under anti-dilution rights
     acquired from a previous investment. Carl Zeiss has certain anti-dilution
     and registration rights similar to the Series A preferred stockholders.

Stock Purchase Warrants


In connection with the Series A private placement offering in 1998, the Company
issued 628,470 common stock purchase warrants to the investors. The warrants are
     exercisable by the holders at any time at an exercise price of $1.87 per
     share. The warrants terminate at the earlier of January 21, 2002 or, under
     certain conditions, at the date of a qualified public offering. In
     addition, the Company issued 314,235 common stock purchase warrants to the
     private placement advisors, which may be exercised any time prior to the
     termination date of January 20, 2003 at an exercise price of $1.59 per
     share. The holders of the $500,000 convertible notes also received warrants
     to purchase 204,252 shares of preferred stock prior to the termination date
     of June 18, 2002 at exercise prices ranging from $1.59 to $2.39 per share,
     respectively. Based on the fair value of the underlying common stock
     compared to the exercise price of the related warrants, these warrants were
     determined to have no value.



In connection with the $1.5 million Senior Term Debt Facility in June of 1999,
the company issued warrants for the purchase of 114,790 shares of common stock
     to the lender. The warrants are exercisable by the holder at any time at an
     exercise price of $1.87 per share. The warrants expire on June 30, 2004.



In connection with the July 1999 equipment financing line, the Company agreed to
issue warrants to the lender up to a maximum of 38,000 warrants if the Company
     borrows the maximum under the facility. The warrants, when issued, are
     exercisable for 5 years at an exercise price of $1.87 per share. Through
     December 31, 1999, 4,037 warrants had been issued under this facility.


                                      F-15
<PAGE>   84
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)


In connection with the Convertible Demand Notes (Note 6), the holders received
warrants to purchase 289,624 shares of common stock. The warrants are
     exercisable by the holders at any time prior to the earlier of November 30,
     2003, or, under certain conditions, at the date of a public offering of
     common stock.


Stock Option Plan


On April 2, 1998, the Company adopted the Stock Plan (the "1998 Plan") under
which 529,800 shares of the Company's common stock were reserved for issuance to
     directors, officers, consultants or employees of the Company, as approved
     by the board of directors. On July 17, 1998, February 15, 1999 and February
     4, 2000, the 1998 Plan was amended and approved by the board of directors
     (and subsequently the stockholders) and the number of shares reserved for
     issuance was increased to 1,059,600, 1,518,760 and 2,623,923, respectively.
     The 1998 Plan, which expires in March 2003, provides for the grant of
     nonstatutory stock options, stock bonuses, stock appreciation rights and
     restricted stock purchase rights.


Options granted under the 1998 Plan are for ten-year terms. Exercise prices of
the nonstatutory stock options are determined by the board of directors. Options
     under the 1998 Plan are generally subject to vesting in installments over a
     four-year period commencing on the grant date.

The following table summarizes activity under the Plan:


<TABLE>
<CAPTION>
                                                            SHARES UNDER   WEIGHTED AVERAGE
                                                               OPTION       EXERCISE PRICE
                                                            ------------   ----------------
<S>                                                         <C>            <C>
Outstanding at December 31, 1997..........................          --             --
  Granted.................................................     768,740          $0.16
  Exercised...............................................          --             --
  Canceled................................................          --             --
                                                             ---------
Outstanding at December 31, 1998..........................     768,740           0.16
  Granted.................................................     486,533           0.16
  Exercised...............................................          --             --
  Canceled................................................          --             --
                                                             ---------
Outstanding at December 31, 1999..........................   1,255,273           0.16
  Granted.................................................     507,308          $1.36
  Exercised...............................................          --             --
  Cancelled...............................................      (7,064)           .16
                                                             ---------
Outstanding at June 30, 2000..............................   1,755,517          $ .49
                                                             =========
</TABLE>



    Deferred compensation for options granted to employees is recorded when the
    exercise price of an option is less than the fair value of the underlying
    stock on the date of grant. Deferred compensation of $259,344, $2.2 million
    and $6.5 million was recorded on these options in 1998, 1999, and for the
    six months ended June 30, 2000, respectively. Deferred compensation is
    amortized to compensation expense on an accelerated basis.



    In addition, in April 1998, the Company granted options to non-employees to
    purchase a total of 42,384 shares of common stock at an exercise price of
    $0.16 per share. Deferred compensation of $14,890 was recorded on these
    options, based on the estimated fair value of the options granted using the
    Black-Scholes model.


                                      F-16
<PAGE>   85
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

    The Company has adopted the disclosure-only provisions of SFAS No. 123.
    Accordingly, compensation expense has been determined based on the intrinsic
    value of the options at the date of award. Had compensation cost for the
    1998 Plan been determined based on the fair value of the options at the
    dates of grant, the impact on the Company's net loss for the years ended
    December 31, 1997, 1998 and 1999 would have been as follows:

<TABLE>
<CAPTION>
                                                 1997           1998            1999
                                              -----------    -----------    ------------
<S>                                           <C>            <C>            <C>
Net loss:
  As reported...............................  $(2,437,876)   $(3,494,660)   $(10,617,803)
  Pro forma.................................   (2,437,876)    (3,500,368)    (10,632,516)
Earnings per share - basic and diluted:
  As reported...............................  $     (0.61)   $     (0.99)   $      (2.77)
  Pro forma.................................        (0.61)         (0.99)          (2.77)
</TABLE>


    The value of these options has been estimated on the date of grant using the
    Black-Scholes model under the minimum value method. The assumptions used in
    computing the minimum value of options granted during 1998 and 1999 were a
    risk-free interest rate of 5% and a weighted average expected life of each
    option of four years.



    The weighted average fair value of the options granted, determined using the
    minimum value method, in 1998 and 1999 were $0.35 and $4.17, respectively.
    The weighted average remaining term of the options outstanding at December
    31, 1999 was 8.8 years.



    2000 Stock Plan



    On March 1, 2000, the board of directors approved the 2000 Stock Plan (the
    "2000 Plan"). All options outstanding under the 1998 Plan continue in
    effect. The 2000 Plan provides for issuance of stock options to employees,
    directors and consultants. The total options authorized under the 1998 Plan
    and the 2000 Plan increased to 1,165,560.


                                      F-17
<PAGE>   86
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

10. NET LOSS PER SHARE

    The following table sets forth the computation of basic and diluted net loss
    per share:


<TABLE>
<CAPTION>
                                                                                                FOR THE SIX MONTHS
                                        YEAR ENDED DECEMBER 31,                                    ENDED JUNE 30
                       ----------------------------------------------------------    -----------------------------------------
                                                                         1999                                         2000
                          1997           1998            1999         PRO FORMA         1999           2000         PRO FORMA
                       -----------    -----------    ------------    ------------    -----------    -----------    -----------
                                                                     (UNAUDITED)
<S>                    <C>            <C>            <C>             <C>             <C>            <C>            <C>
Numerator:
  Net loss...........  $(2,437,876)   $(3,494,660)   $(10,617,803)   $(10,617,803)   $(4,603,066)   $(8,743,733)   $(8,743,733)
  Less: preferred
    stock
    dividends........           --       (518,017)       (933,232)             --       (454,204)    (7,120,609)            --
                       -----------    -----------    ------------    ------------    -----------    -----------    -----------
  Net loss
    attributable to
    common
    stockholders.....  $(2,437,876)   $(4,012,677)   $(11,551,035)   $(10,617,803)    (5,057,270)   (15,864,342)   $(8,743,733)
                       ===========    ===========    ============    ============    ===========    ===========    ===========
Denominator:
  Weighted average
    shares - basic
    and diluted......    3,986,392      4,069,726       4,174,835      10,990,475      4,167,823      4,183,015     13,029,661
                       ===========    ===========    ============    ============    ===========    ===========    ===========
Basic and diluted net
  loss per share.....  $     (0.61)   $     (0.99)   $      (2.77)   $      (0.97)   $     (1.21)   $     (3.79)   $     (0.67)
                       ===========    ===========    ============    ============    ===========    ===========    ===========
</TABLE>



    Pro forma loss per share for the year ended December 31, 1999 and six-month
    period ended June 30, 2000 is computed assuming conversion of convertible
    preferred stock outstanding at the end of each period into common stock on a
    one for one basis at the beginning of each period, or the date of issuance
    if later. The convertible preferred stock will automatically convert to
    common stock upon the completion of an initial public offering.



    For 1997, 1998, 1999 and the six months ended June 30, 2000, 0, 3,924,359,
    7,314,863 and 10,602,719 shares, respectively, of potential common stock
    were excluded because their effect was anti-dilutive. On a pro forma basis
    for 1999 and the six-months ending June 30, 2000 499,223 and 1,756,073
    shares, respectively, of potential common stock related to options and
    warrants were excluded because their effect was anti-dilutive.


11. RELATED PARTY TRANSACTIONS

    Zeiss

    On April 14, 1998, the Company entered into an exclusive, worldwide,
    Co-Marketing, Manufacturing, Sales and Support and Development Agreement
    (the "Original Zeiss Agreement") with Carl Zeiss Jena GmbH ("Zeiss"), a
    stockholder, to deliver integrated screening systems and services for the
    optimization of the drug discovery process. As part of the Original Zeiss
    Agreement, Zeiss will manufacture a high content screening kinetics system
    exclusively for the Company using the Company's proprietary software. The
    Company is responsible for marketing, selling and servicing this high
    content screening system.

    On February 3, 2000, a Development, Manufacturing and Supply Agreement (the
    "New Zeiss Agreement") was entered into between the Company and Zeiss which
    supersedes the Original Zeiss Agreement. This agreement principally provides
    for the manufacture and supply of products as described above for a
    five-year term, and includes provisions whereby the Company agrees to
    reimburse Zeiss for an additional $2.0 million for development costs
    incurred by Zeiss through December 31, 1999. These

                                      F-18
<PAGE>   87
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)


    amounts are to be paid during 2000 and 2001 in equal installments of $1.0
    million. The total of $2.0 million has been reflected in the balance sheet
    as a payable to related party. Additionally, the Company has capital
    expenditure commitments to Zeiss of $1.2 million during 2000.


    On February 21, 2000 the Company and Zeiss entered into a sales and
    marketing agreement for ultra-high throughput screening products whereby the
    Company will be the exclusive dealer and distributor for high throughput and
    ultra-high throughput screening systems and related products in the United
    States and Canada through December 31, 2005.


    The Company also purchases components from Zeiss for other products
    assembled by the Company. Total purchases for 1998 and 1999 approximated
    $160,500 and $317,000, respectively.


    QED Imaging


    On May 1, 1999, the Company entered into an agreement with QED Imaging
    ("QED"). The term of this agreement is one year. The agreement provides for
    monthly payments by the Company based upon services performed with the
    potential for a bonus, subject to satisfactory performance and completion of
    the milestones. Costs incurred under this contract which have been charged
    to research and development expense, amounted to $165,334 in 1999.


    Other


    A stockholder of the Company is a partner of a law firm that provides
    services to the Company. During 1997, 1998 and 1999, the services provided
    by his firm were $10,809, $168,998 and $110,617, respectively.


12. GRANTS

    On March 9, 1998, the Company received a component of a five-year program
    project grant entitled Combinatorial Approaches for Novel Anticancer Agents.
    The Company, working as a subcontractor, will receive approximately $1.0
    million of an approximately $4.2 million, five-year program project grant
    that is being funded by the National Cancer Institute Special Emphasis
    Panel.

    On April 28, 1998, the Company received a Small Business Information
    Research grant for $700,000 over a two-year period from the National
    Institutes of Health to develop a cytotoxicity assay. Lawrence Livermore
    National Laboratory is a subcontractor.


    On September 16, 1998, the Company entered into a $16.4 million Defense
    Advanced Research Project Agency ("DARPA") cost-sharing contract for the
    development of the CellChip System and the Fluorotox Database to detect
    toxins. During the first phase (September 13, 1998 through September 12,
    2000) of the contract, the Company will receive $2.4 million from the
    government and provide matching funds of in-kind costs of $5.2 million. The
    matching funds of in-kind costs are primarily costs associated with other
    Company projects, which indirectly benefit the DARPA project. Through
    December 31, 1999, the Company has recognized $1.6 million in revenues, of
    which $1.4 million has been received. The remaining $182,763 has been billed
    to the government and is recorded in accounts receivable. The Company has
    incurred $3.4 million of "in-kind" costs under the program which have been
    recorded as research and development expenses. Billings occur monthly based
    on the costs incurred and the stipulated percentage of total project costs
    representing the government's share.


    The government has an option for a second phase (September 13, 2000 through
    September 13, 2002) of the contract. If the option is exercised, the Company
    will receive an additional $4.6 million during

                                      F-19
<PAGE>   88
                                CELLOMICS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
      (INFORMATION AS OF JUNE 30, 2000 AND FOR THE SIX-MONTH PERIODS ENDED
                      JUNE 30, 1999 AND 2000 IS UNAUDITED)

    phase II and will provide matching funds of in-kind costs of $4.2 million.
    The Company has hired subcontractors to perform services under this contract
    totaling $758,000 in phase I and, subject to the government exercising its
    option, $1.9 million in phase II.


    Total grant revenues were $584,000, $1.8 million, $1,015,262 and $821,212 in
    1998, 1999 and for the six months ended June 30, 1999 and 2000,
    respectively. There were no grant revenues in 1997. Included in research and
    development expenses in the statement of operations are direct costs of
    $545,646, $1.7 million, 654,160 and 758,768 in 1998, 1999 and for the six
    months ended June 30, 1999 and 2000, respectively.


13. EMPLOYEE BENEFITS


    The Company maintains a defined contribution retirement savings plan
    covering substantially all employees and permits participants to make
    contributions by salary deduction pursuant to Section 401(k) of the Internal
    Revenue Code. Such amounts may be matched by the Company under certain
    conditions. Also, the Company may make, at its discretion, additional
    contributions to the plan. The Company did not make any contributions to the
    plan during 1997, 1998 or 1999.



14. SUBSEQUENT EVENTS



    Stock Split



    On April 11, 2000, the board of directors of the Company approved a
    3.532-for-1 stock split effective immediately prior to the initial public
    offering. All common stock and potential common stock share and per share
    data in these financial statements have been retroactively adjusted to
    reflect this change.



    Sale of Common Stock



    On July 3, 2000 the Company sold 541,300 shares of common stock for net
    proceeds of $4.8 million to Beckman Coulter, Inc. The following unaudited
    pro forma balance sheet information illustrates the impact of this
    transaction, as well as the conversion of the Series A and Series B
    preferred stock into common stock upon the closing of the initial public
    offering as if such transactions had occurred at June 30, 2000:



<TABLE>
<CAPTION>
                                                JUNE 30     JUNE 30, 2000
                                                 2000         PRO FORMA
                                              -----------   -------------
<S>                                           <C>           <C>
Cash........................................      852,306     5,652,284
Mandatorily redeemable convertible preferred
  stock.....................................   20,915,695            --
Common stock................................       41,830       141,204
Additional paid-in capital..................   10,627,885    34,367,293
Total stockholders' equity..................  (21,136,628)    2,712,154
</TABLE>





                                      F-20
<PAGE>   89

[PHOTOGRAPHS AND DESCRIPTIONS OF OUR CURRENT PRODUCTS]
<PAGE>   90

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

Until               , all dealers effecting transactions in these securities,
whether or not participating in this offering, may be required to deliver a
prospectus. This is in addition to the obligation of dealers to deliver a
prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.
--------------------------------------------------------------------------------

                                 CELLOMICS LOGO

                          PRUDENTIAL VECTOR HEALTHCARE
                        A UNIT OF PRUDENTIAL SECURITIES

                                  ING BARINGS



--------------------------------------------------------------------------------
<PAGE>   91

                                    PART II

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth all expenses, other than underwriting
discounts and commissions, payable by the Registrant in connection with the sale
of the common stock being registered. All amounts are estimated except the
Securities and Exchange Commission registration fee and the NASD filing fee.

<TABLE>
<S>                                                           <C>
Registration fee............................................  $   31,000
NASD filing fee.............................................      10,500
Nasdaq National Market listing fee..........................      90,000
Printing and engraving expenses.............................     250,000
Legal fees and expenses.....................................     350,000
Accounting fees and expenses................................     315,000
Transfer Agent and registrar fees...........................      10,000
Premium for directors and officers insurance................     185,000
Miscellaneous...............................................       8,500
                                                              ----------
     Total..................................................  $1,250,000
                                                              ==========
</TABLE>

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Our Amended and Restated Certificate of Incorporation requires us to
indemnify our directors and officers against liabilities they may incur in these
capacities, including liabilities under the Securities Act, to the maximum
extent permitted by Section 145 of the Delaware General Corporation Law.

     Our bylaws require that we indemnify each of our directors and officers for
the judgments, fines and amounts paid in settlement, and the expenses reasonably
incurred, in connection with any type of threatened, pending or completed
action, suit or proceeding, whether or not bought by us or on our behalf. We
must also advance all expenses incurred once we have received a commitment from
the indemnified person to repay the amount if they should lose the action. We
may, and have, purchased and maintained insurance on behalf of our directors and
officers to the extent permitted by Delaware law.

     Our Amended and Restated Certificate of Incorporation provides that our
directors shall not be personally liable either to us or to any stockholder for
monetary damages for breach of fiduciary duty as a director, except (i) for any
breach of the director's duty of loyalty to us or our stockholders, or (ii) for
acts or omissions which are not in good faith or which involve intentional
misconduct or knowing violation of the law, or (iii) for any matter in respect
of which such director shall be liable under Section 174 of Title 8 of the
Delaware General Corporation Law or any amendment thereto or successor provision
thereto, or (iv) for any transaction from which the director shall have derived
an improper personal benefit.


     Reference is also made to Section      of the underwriting agreement
contained in Exhibit 1.1 hereto, indemnifying our officers and directors against
certain liabilities.


ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES

     Since March 1, 1997, the Company has made sales of the following
unregistered securities:

     Common Stock. (i) On January 21, 1998, in connection with the sale of
Series A Preferred Stock as described below (see "Preferred Stock," (i)), the
Company issued 90,278 shares of common stock to an existing stockholder pursuant
to anti-dilution rights held by such stockholder in accordance with its previous
investment. No underwriters were involved and no commission was paid. The shares
were issued in reliance on the exemption from registration contained in Section
4(2) of the Securities Act for transactions not involving a public offering.

     (ii) On January 15, 1999, in connection with the sale of Series A Preferred
Stock as described below (see "Preferred Stock," (ii)), the Company issued
106,345 shares of common stock to an existing stockholder
                                      II-1
<PAGE>   92

pursuant to anti-dilution rights held by such stockholder in accordance with its
previous investment. No underwriters were involved and no commission was paid.
The shares were issued in reliance on the exemption from registration contained
in Section 4(2) of the Securities Act for transactions not involving a public
offering.


     (iii) On July 3, 2000, we sold 541,300 shares of our common stock to
Beckman Coulter for aggregate proceeds to Cellomics of $4.8 million. The common
stock was sold in reliance on the exemption from registration contained in
Section 4(2) of the Securities Act for transactions not involving a public
offering.



     Options. (i) From March 1, 1997 to the present, the Company has issued
employee stock options to purchase a total of 1,741,477 shares of common stock
to 107 employees, directors and consultants of the Company at an exercise prices
ranging from $.16 to $2.12 which represents a discount from fair market value.
The grants of such options were exempt from registration pursuant to Rule 701 of
the Securities Act.


     Warrants. (i) On June 18, 1997, in connection with the sales of convertible
notes as described below (see "Convertible Notes," (i)), the Company issued a
warrant to one entity with certain concomitant rights to purchase shares of
preferred stock of the Company for the exercise price of $25,000. On January 8,
1998, these warrants were canceled and replaced with the warrants dated January
21, 1998 to purchase 15,710 shares of preferred stock of the Company as
described in (iv) below. No underwriters were involved and no commission was
paid. The warrants were sold in reliance on the exemption from registration
contained in Section 4(2) of the Securities Act for transactions not involving a
public offering.

     (ii) On August 1, 1997, in connection with the sales of convertible notes
as described below (see "Convertible Notes," (ii)), the Company issued a warrant
to one entity for the purchase of 188,542 shares of preferred stock of the
Company at an exercise price of $2.39. On January 16, 1998, this warrant was
canceled and replaced with the warrant issued on January 21, 1998 to purchase
188,542 shares of preferred stock of the Company as described in (v) below. No
underwriters were involved and no commission was paid. The warrants were sold in
reliance on the exemption from registration contained in Section 4(2) of the
Securities Act for transactions not involving a public offering.

     (iii) On January 21, 1998, in connection with the sale of Series A
Preferred Stock as described below (see "Preferred Stock," (i)), the Company
issued warrants to 7 persons or entities for the purchase of 628,470 shares of
common stock of the Company at an exercise price of $1.87. The warrants were
issued with the shares of Series A Preferred Stock for an aggregate purchase
price of $5,532,839. The Company also issued warrants to purchase 314,235 shares
of common stock to 2 persons or entities with an exercise price of $1.59, as
compensation for financial and advisory services performed in connection with
the transaction. The warrants were sold in reliance on the exemption from
registration contained in Section 4(2) of the Securities Act for transactions
not involving a public offering.

     (iv) On January 21, 1998, in connection with the sales of convertible notes
as described below (see "Convertible Notes," (i)), the Company issued a warrant
to one entity for the purchase of 15,710 shares of Series A Preferred Stock of
the Company at an exercise price of $1.59. The warrants were issued in reliance
on the exemption from registration contained in Section 4(2) of the Securities
Act for transactions not involving a public offering.

     (v) On January 21, 1998, in connection with the sales of convertible notes
as described below (see "Convertible Notes," (ii)), the Company issued a warrant
to one entity for the purchase of 188,542 shares of Series A Preferred Stock of
the Company at an exercise price of $2.39. The warrants were issued in reliance
on the exemption from registration contained in Section 4(2) of the Securities
Act for transactions not involving a public offering.

     (vi) On June 30, 1999, the Company issued a warrant for the purchase of
114,790 shares of common stock at an exercise price of $1.87 to one financial
institution as partial consideration for the issuance of a $1.5 million senior
term loan to the Company. The warrants were sold in reliance on the exemption
from registration contained in Section 4(2) of the Securities Act for
transactions not involving a public offering.

                                      II-2
<PAGE>   93

     (vii) On August 30, 1999, October 4, 1999 and December 14, 1999, the
Company issued warrants for the purchase of 1,515, 1,335 and 1,187 shares of
common stock at an exercise price of $1.87, respectively, to one financial
institution as partial consideration for extending a $3 million equipment
financing line of credit to the Company. No underwriters were involved and no
commission was paid. The warrants were sold in reliance on the exemption from
registration contained in Section 4(2) of the Securities Act for transactions
not involving a public offering.

     (viii) On February 23, 2000, the Company issued warrants to purchase
289,624 shares of common stock with an exercise price of $3.42 to 8 persons or
entities in connection with the sale of convertible demand notes as described
below (see "Convertible Notes" (iii)). No underwriters were involved and no
commission was paid. The warrants were sold in reliance on the exemption from
registration contained in Section 4(2) of the Securities Act for transactions
not involving a public offering.

     (iv) On February 23, 2000, in connection with the sale of convertible notes
as described below (see "Convertible Notes" (iii)), the Company issued warrants
to purchase 19,758 shares of common stock with an exercise price of $3.42 to 2
persons or entities pursuant to pre-emptive rights held by such persons or
entities. No underwriters were involved and no commission was paid. The warrants
were sold in reliance on the exemption from registration contained in Section
4(2) of the Securities Act for transactions not involving a public offering.

     Convertible Notes: (i) On June 18, 1997, the Company issued to one entity a
convertible note for $50,000. No underwriters were involved and no commission
was paid. The note was sold in reliance on the exemption from registration
contained in Section 4(2) of the Securities Act for transactions not involving a
public offering.

     (ii) On August 1, 1997, the Company issued to one entity a convertible note
for $450,000. No underwriters were involved and no commission was paid. The note
was sold in reliance on the exemption from registration contained in Section
4(2) of the Securities Act for transactions not involving a public offering.

     (iii) On November 30, 1999, the Company issued to 8 persons or entities
$1.8 million of convertible demand notes. No underwriters were involved and no
commission was paid. The notes were sold in reliance on the exemption from
registration contained in Section 4(2) of the Securities Act for transactions
not involving a public offering.

     Preferred Stock: (i) On January 21, 1998, the Company sold 3,477,222 shares
of Series A Preferred Stock to 8 persons or entities, along with the warrants
described above (see "Warrants" (iii)) for an aggregate purchase price of
$5,532,839. As noted above in "Warrants," the Company also issued 314,235
warrants to purchase common stock to 2 entities or persons, with an exercise
price of $1.59 as compensation for financial and advisory services performed in
connection with the transaction. In addition, 2 entities converted $500,000 of
notes plus accrued interest of $19,550 into 326,523 shares of Series A Preferred
Stock. The shares were issued in reliance on the exemption from registration
contained in Section 4(2) of the Securities Act for transactions not involving a
public offering, and in accordance with Regulation D.

     (ii) On January 15, 1999, 7 entities purchased 3,142,350 shares of Series A
Preferred Stock for an aggregate purchase price of $5,000,000. No underwriters
were involved and no commission was paid. The notes were sold in reliance on the
exemption from registration contained in Section 4(2) of the Securities Act for
transactions not involving a public offering, and in accordance with Regulation
D.

     (iv) On February 23, 2000, 11 persons or entities purchased 1,911,102
shares of Series B Preferred Stock from the Company for an aggregate purchase
price of $6,530,863. In addition, $1.8 million of convertible demand notes,
issued to 8 persons or entities on November 30, 1999 as described above (see
"Convertible Notes," (iii) above)), plus accrued interest of $41,863, were
converted into 538,958 shares of Series B Preferred Stock. No underwriters were
involved and no commission was paid. The shares were sold in reliance on the
exemption from registration contained in Section 4(2) of the Securities Act for
transactions not involving a public offering, and in accordance with Regulation
D.

                                      II-3
<PAGE>   94

     All sales of common stock made pursuant to the exercise of stock options
were made in reliance on Rule 701 under the Securities Act or Section 4(2) of
the Securities Act. All other sales were made in reliance on Section 4(2) of the
Securities Act and/or Regulation D promulgated under the Securities Act. These
sales were made without general solicitation or advertising, to investors who
were sophisticated and who had access to all relevant information necessary to
evaluate the investment, and who represented the Registrant that they were
acquiring the Securities for investment and appropriate legends were affixed to
the share certificates in such transactions.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENTS

     (a) Exhibits


<TABLE>
<CAPTION>
EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
-----------                      ----------------------
<S>           <C>
  1.1         Form of Underwriting Agreement**
  3.1         Amended and Restated Certificate of Incorporation of
              Cellomics*
  3.2         Bylaws of Cellomics*
  4.1         Loan and Security Agreement with Transamerica Business
              Credit Corporation, including warrant, dated June 30, 1999*
  4.2         Master Loan and Security Agreement with Oxford Venture
              Finance, LLC, including warrant, dated July 21, 1999*
  4.3         Series A Preferred Stock and Warrant Purchase Agreement by
              and among certain purchasers listed and Cellomics, Inc.,
              dated January 21, 1998*
  4.4         Series B Preferred Stock Purchase Agreement by and among
              certain purchasers listed and Cellomics, Inc., dated
              February 23, 2000*
  4.5         Form of Stock Certificate for shares of Common Stock*
  5.1         Form of Opinion of Buchanan Ingersoll Professional
              Corporation**
 10.1         Lease Agreement with University of Pittsburgh, dated July 1,
              1996, for lease of office and laboratory space*
 10.2         Form of Proprietary Information and Property Agreement*
 10.3         License and Supply Agreement with Molecular Probes, Inc.,
              ("MPI") dated April 5, 1999 (the "MPI Agreement")*
 10.4         Employment Agreement between Biological Detection, Inc. and
              D. Lansing Taylor, dated October 1, 1998*
 10.5         Employment Offer Letter for R. Terry Dunlay, dated February
              2, 1999*
 10.6         Employment Offer Letter for L. Robert Johnston, dated
              October 15, 1998*
 10.7         Employment Offer Letter for Michael A. Nemzek, dated
              November 9, 1998*
 10.8         Employment Offer Letter for Alan W. Seadler, dated October
              12, 1998*
 10.9         Form of Key Employee Non-Compete Agreement*
 10.10        Development, Manufacturing and Supply Agreement with Carl
              Zeiss Jena GmbH, dated February 3, 2000*
 10.11        Award/Contract issued by the Office of Naval Research, dated
              September 14, 1998*
 10.12        Alliance Agreement with ACLARA BioSciences, Inc., dated
              October 26, 1999*
 10.13        Subcontract with University of Pittsburgh, dated May 5,
              1998*
 10.14        Patent License Agreement with Public Health Service (NIH),
              dated September 26, 1997*
</TABLE>


                                      II-4
<PAGE>   95


<TABLE>
<CAPTION>
EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
-----------                      ----------------------
<S>           <C>
 10.15        Sales and Marketing Agreement with Carl Zeiss Jena GmbH,
              dated February 21, 2000*
 10.16        Cellomics, Inc. 2000 Stock Plan*
 10.17        License and Supply Agreement Amendment, made as of April 5,
              2000 by and between MPI and Cellomics amending the MPI
              Agreement**
 10.18        Common Stock Purchase Agreement by and between Beckman
              Coulter, Inc. and Cellomics, Inc. dated as of June 9,
              2000.**
 10.19        Strategic Relationship Agreement by and between Cellomics,
              Inc. and Beckman Coulter, Inc.**
 21.1         List of subsidiaries of Cellomics*
 23.1         Consent of PricewaterhouseCoopers LLP
 23.2         Consent of Buchanan Ingersoll Professional Corporation
              (contained in the opinion filed as Exhibit 5 to the
              Registration Statement)**
 24           Powers of Attorney of certain officers and directors of
              Cellomics (contained on the signature page of this
              Registration Statement)*
 27           Financial Data Schedule
</TABLE>


---------------
*  Previously filed.

** To be filed by amendment.

     (b) Financial Statement Schedules

     The following financial statement schedule is filed herewith--Schedule
II--Valuation and Qualifying Accounts.

ITEM 17. UNDERTAKINGS

     We hereby undertake that:

     (1) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted as to directors, officers and controlling persons of
Cellomics pursuant to the provisions described in Item 14, or otherwise, we have
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by Cellomics of expenses
incurred or paid by a director, officer or controlling person of Cellomics 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, we will, unless in the opinion of our 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 Securities Act and will be governed by the final adjudication
of such issue.

     (2) For purposes of determining any liability under the Securities Act, the
information omitted from the form of prospectus filed as part of this
registration statement in reliance upon Rule 430A and contained in a form of
prospectus filed by Cellomics pursuant to Rule 424(b)(1) or (4) or 497(h) under
the Securities Act shall be deemed to be part of this registration statement as
of the time it was declared effective.

     (3) For the purpose of determining any liability under the Securities Act,
each post-effective amendment that contains a form of prospectus 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.

     (4) At the closing, specified in the underwriting agreement, we shall
provide the underwriters certificates in such denominations and registered in
such names as required by the underwriters to permit prompt delivery to each
purchaser.

                                      II-5
<PAGE>   96

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Company has duly caused Amendment No. 2 to this Registration Statement on Form
S-1 to be signed on its behalf by the undersigned, thereunto duly authorized, in
the City of Pittsburgh, Commonwealth of Pennsylvania, on the 1st day of
September, 2000.


                                          CELLOMICS, INC.

                                          By:                  *
                                            ------------------------------------
                                              D. Lansing Taylor, Ph.D.
                                              President and Chief Executive
                                              Officer

                               POWER OF ATTORNEY


     Pursuant to the requirements of the Securities Act of 1933, as amended,
Amendment No. 2 to this Registration Statement has been signed by the following
persons in the capacities and on the dates indicated.



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

                      *                        President and Chief Executive       September 1, 2000
---------------------------------------------    Officer and Director (Principal
          D. Lansing Taylor, Ph.D.               Executive Officer)

         /s/ L. ROBERT JOHNSTON, JR.           Vice President Chief Financial      September 1, 2000
---------------------------------------------    Officer (Principal Financial and
           L. Robert Johnston, Jr.               Accounting Officer)

                      *                        Chairman of the Board of Directors  September 1, 2000
---------------------------------------------
                John M. Boles

                      *                        Director                            September 1, 2000
---------------------------------------------
               Alan Mendelson

                      *                        Director                            September 1, 2000
---------------------------------------------
               James A. Sharp

                      *                        Director                            September 1, 2000
---------------------------------------------
            Arnold Oronsky, Ph.D.

                      *                        Director                            September   , 2000
---------------------------------------------
              Barclay Phillips

        * /s/ L. ROBERT JOHNSTON, JR.
  ------------------------------------------
  L. Robert Johnston, Jr., Attorney-in-fact
  Dated: September 1, 2000
</TABLE>


                                      II-6
<PAGE>   97

                      REPORT OF INDEPENDENT ACCOUNTANTS ON
                          FINANCIAL STATEMENT SCHEDULE

To the Board of Directors
and Stockholders of Cellomics, Inc.:

Our audits of the financial statements referred to in our report dated March 3,
2000, appearing in this Registration Statement on Form S-1 for Cellomics, Inc.
also included an audit of the financial statement schedule listed in Item 16(b)
of this Registration Statement on Form S-1. In our opinion, this financial
statement schedule presents fairly, in all material respects, the information
set forth therein when read in conjunction with the related financial
statements.

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania

March 3, 2000 except as to


the second paragraph of


Note 14 which is as of


July 3, 2000


                                      II-7
<PAGE>   98


                SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS


<TABLE>
<CAPTION>
                                                             ADDITIONS
                                                      -----------------------
                                        BALANCE AT    CHARGED TO     CHARGED                    BALANCE
                                         BEGINNING     COSTS AND    TO OTHER                    AT END
             DESCRIPTION                 OF PERIOD     EXPENSES     ACCOUNTS    DEDUCTIONS     OF PERIOD
             -----------                ----------    ----------    --------    ----------     ---------
<S>                                     <C>           <C>           <C>         <C>           <C>

For the year ending December 31, 1997
  Deferred tax valuation allowance....  $  234,000    $  840,000       $--          $--       $1,074,000
                                        ==========    ==========       ===          ===       ==========
For the year ending December 31, 1998
  Deferred tax valuation allowance....  $1,074,000    $1,918,332       $--          $--       $2,992,332
                                        ==========    ==========       ===          ===       ==========
For the year ending December 31, 1999
  Deferred tax valuation allowance....  $2,992,332    $4,114,329       $--          $--       $7,106,661
                                        ==========    ==========       ===          ===       ==========
</TABLE>

                                      II-8
<PAGE>   99

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
-----------                      ----------------------
<S>           <C>
  1.1         Form of Underwriting Agreement**
  3.1         Amended and Restated Certificate of Incorporation of
              Cellomics*
  3.2         Bylaws of Cellomics*
  4.1         Loan and Security Agreement with Transamerica Business
              Credit Corporation, including warrant, dated June 30, 1999*
  4.2         Master Loan and Security Agreement with Oxford Venture
              Finance, LLC, including warrant, dated July 21, 1999*
  4.3         Series A Preferred Stock and Warrant Purchase Agreement by
              and among certain purchasers listed and Cellomics, Inc.,
              dated January 21, 1998*
  4.4         Series B Preferred Stock Purchase Agreement by and among
              certain purchasers listed and Cellomics, Inc., dated
              February 23, 2000*
  4.5         Form of Stock Certificate for shares of Common Stock*
  5.1         Form of Opinion of Buchanan Ingersoll Professional
              Corporation**
 10.1         Lease Agreement with University of Pittsburgh, dated July 1,
              1996, for lease of office and laboratory space*
 10.2         Form of Proprietary Information and Property Agreement*
 10.3         License and Supply Agreement with Molecular Probes, Inc.,
              ("MPI") dated April 5, 1999 (the "MPI Agreement")*+
 10.4         Employment Agreement between Biological Detection, Inc. and
              D. Lansing Taylor, dated October 1, 1998*
 10.5         Employment Offer Letter for R. Terry Dunlay, dated February
              2, 1999*
 10.6         Employment Offer Letter for L. Robert Johnston, dated
              October 15, 1998*
 10.7         Employment Offer Letter for Michael A. Nemzek, dated
              November 9, 1998*
 10.8         Employment Offer Letter for Alan W. Seadler, dated October
              12, 1998*
 10.9         Form of Key Employee Non-Compete Agreement*
 10.10        Development, Manufacturing and Supply Agreement with Carl
              Zeiss Jena GmbH, dated February 3, 2000*+
 10.11        Award/Contract issued by the Office of Naval Research, dated
              September 14, 1998*
 10.12        Alliance Agreement with ACLARA BioSciences, Inc., dated
              October 26, 1999*+
 10.13        Subcontract with University of Pittsburgh, dated May 5,
              1998*
 10.14        Patent License Agreement with Public Health Service (NIH),
              dated September 26, 1997*
 10.15        Sales and Marketing Agreement with Carl Zeiss Jena GmbH,
              dated February 21, 2000*+
 10.16        Cellomics, Inc. 2000 Stock Plan*
 10.17        License and Supply Agreement Amendment, made as of April 5,
              2000 by and between MPI and Cellomics amending the MPI
              Agreement**
 10.18        Common Stock Purchase Agreement by and between Beckman
              Coulter, Inc. and Cellomics, Inc. dated as of June 9,
              2000.**
 10.19        Strategic Relationship Agreement by and between Cellomics,
              Inc. and Beckman Coulter, Inc.**
 21.1         List of subsidiaries of Cellomics*
 23.1         Consent of PricewaterhouseCoopers LLP
 23.2         Consent of Buchanan Ingersoll Professional Corporation
              (contained in the opinion filed as Exhibit 5 to the
              Registration Statement)**
 24           Powers of Attorney of certain officers and directors of
              Cellomics (contained on the signature page of this
              Registration Statement)*
 27           Financial Data Schedule
</TABLE>


---------------
*  Previously filed.

** To be filed by amendment.


+  Portions of this exhibit have been omitted pursuant to a request for
   confidential treatment.



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