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


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM 10-Q


                QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                             -----------------------

                  FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2004

                        COMMISSION FILE NUMBER 000-21930


                          BIOSOURCE INTERNATIONAL, INC.
             (Exact name of Registrant as specified in its charter)

           DELAWARE                                               77-0340829
(State or other jurisdiction of                               (I.R.S. Employer
  incorporation or organization)                             Identification No.)


         542 FLYNN ROAD, CAMARILLO, CALIFORNIA                     93012
        (Address of principal executive offices)                (Zip Code)


       Registrant's telephone number, including area code: (805) 987-0086


         Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during the  preceding  12 months  (or for such  shorter  periods  that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.


                         YES  [X]             NO [_]

         Indicate by check mark whether the registrant is an  accelerated  filer
(as defined in Rule 12b-2 of the Act). Yes [_]   No [X].

The  number  of shares  of the  Registrant's  common  stock,  $.001  par  value,
outstanding as of May 10, 2004 was 9,435,138.


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





                 BIOSOURCE INTERNATIONAL, INC. AND SUBSIDIARIES
                                    FORM 10-Q
                                 MARCH 31, 2004

                                      INDEX



                                                                        PAGE NO.
                                                                        --------
                          PART I. FINANCIAL INFORMATION

ITEM 1.  UNAUDITED FINANCIAL STATEMENTS

            Condensed Consolidated Balance Sheets as of
            March 31, 2004 and December 31, 2003                               3

            Condensed Consolidated Statements of Operations
            for the Three Months Ended March 31, 2004 and 2003                 4

            Condensed Consolidated Statements of Cash
            Flows for the Three Months Ended March 31, 2004
            and 2003                                                           5

            Notes to Condensed Consolidated Financial Statements               6

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
            CONDITION AND RESULTS OF OPERATIONS                               10

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK           24

ITEM 4.  CONTROLS AND PROCEDURES                                              25


                           PART II. OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS                                                    26

ITEM 2.  CHANGES IN SECURITIES AND USE OF PROCEEDS                            26

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES                                      26

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS                  26

ITEM 5.  OTHER INFORMATION                                                    26

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K                                     27

SIGNATURES                                                                    28


                                       2



                 BIOSOURCE INTERNATIONAL, INC. AND SUBSIDIARIES
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                             (Amounts in thousands)
                                   (Unaudited)


                                                        MARCH 31,   DECEMBER 31,
                                                           2004          2003
                                                         --------      --------

            ASSETS
Current assets:
   Cash and cash equivalents .......................     $  3,794         3,297
   Accounts receivable, less allowance for doubtful
     accounts of $213 at March 31, 2004 and $258 at
     December 31, 2003 .............................        7,217         6,308
   Inventories, net ................................        9,170         9,074
   Prepaid expenses and other current assets .......          889           652
   Deferred income taxes ...........................        2,363         2,363
                                                         --------      --------
                         Total current assets ......       23,433        21,694

Property and equipment, net ........................        6,191         6,235
Intangible assets net of accumulated amortization
     of $3,319 at March 31, 2004 and $3,230 at
     December 31, 2003 .............................        5,362         5,500
Goodwill ...........................................          307           307
Other assets .......................................          532           519
Deferred tax assets ................................       10,078        10,078
                                                         --------      --------
                                                         $ 45,903        44,333
                                                         ========      ========
            LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Accounts payable ................................     $  3,078         2,451
   Accrued expenses ................................        3,184         3,227
   Deferred revenue ................................          202           249
   Income tax payable ..............................          527           104
                                                         --------      --------
                         Total current liabilities .        6,991         6,031
                                                         --------      --------

Commitments and contingencies

Stockholders' equity:
  Common stock, $.001 par value. Authorized
     20,000,000 shares: issued and outstanding
     9,403,951 shares at March 31, 2004 and
     9,376,860 at December 31, 2003 ................            9             9
  Additional paid-in capital .......................       42,698        42,633
  Accumulated deficit ..............................       (3,743)       (4,452)
  Accumulated other comprehensive gain (loss) ......          (52)          112
                                                         --------      --------
                         Net stockholders' equity ..       38,912        38,302
                                                         --------      --------
                                                         $ 45,903        44,333
                                                         ========      ========


The  accompanying  notes are an integral  part of these  condensed  consolidated
financial statements.


                                       3



                 BIOSOURCE INTERNATIONAL, INC. AND SUBSIDIARIES
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                   THREE MONTHS ENDED MARCH 31, 2004 AND 2003
                  (Amounts in thousands, except per share data)
                                   (Unaudited)

                                                          THREE MONTHS ENDED
                                                               MARCH 31,
                                                         2004            2003
                                                       --------        --------

Net sales ......................................       $ 12,286          10,899
Cost of sales ..................................          5,426           4,690
                                                       --------        --------
    Gross profit ...............................          6,860           6,209
                                                       --------        --------

Operating expenses:
    Research and development ...................          1,385           1,979
    Sales and marketing ........................          2,470           2,388
    General and administrative .................          1,955           1,576
    Amortization of intangibles ................            139             145
                                                       --------        --------
         Total operating expenses ..............          5,949           6,088
                                                       --------        --------
Operating income ...............................            911             121

Interest income, net ...........................             11              11
Other expense, net .............................            (25)            (18)
                                                       --------        --------
Income before income taxes .....................            897             114
Income tax expense .............................            188              11
                                                       --------        --------
        Net income .............................       $    709             103
                                                       ========        ========

Net income per share:
    Basic ......................................       $   0.08            0.01
                                                       ========        ========
    Diluted ....................................       $   0.07            0.01
                                                       ========        ========

Shares used to compute per share amounts:
    Basic ......................................          9,395           9,635
                                                       ========        ========
    Diluted ....................................          9,752          10,026
                                                       ========        ========



The  accompanying  notes are an integral  part of these  condensed  consolidated
financial statements.


                                       4



                 BIOSOURCE INTERNATIONAL, INC. AND SUBSIDIARIES
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                   THREE MONTHS ENDED MARCH 31, 2004 AND 2003
                             (Amounts in thousands)
                                   (Unaudited)

                                                            2004          2003
                                                           -------      -------

Cash flows from operating activities:
      Net income .....................................     $   709          103
      Adjustments to reconcile net income
           to net cash provided by (used in)
           operating activities:
           Depreciation and amortization .............         631          653
      Changes in assets and liabilities:
           Accounts receivable .......................        (991)        (864)
           Inventories ...............................        (235)        (350)
           Prepaid expenses and other
                current assets .......................        (240)        (324)
           Other assets ..............................         (14)         (11)
           Accounts payable ..........................         669         (525)
           Accrued expenses ..........................         (34)        (173)
           Deferred revenue ..........................         (47)         (49)
           Income taxes payable ......................         446          313
                                                           -------      -------
      Net cash provided from (used in)
           operating activities ......................         894       (1,227)
                                                           -------      -------

Cash flows from investing activities:
      Purchase of property and equipment .............        (502)        (238)
                                                           -------      -------
           Net cash used in investing
                activities ...........................        (502)        (238)
                                                           -------      -------

Cash flows from financing activities:
      Proceeds from the exercise of options ..........          65           95
      Payments to acquire treasury stock .............        --           (666)
                                                           -------      -------
      Net cash provided from (used in)
           financing activities ......................          65         (571)
                                                           -------      -------

           Net increase (decrease) in cash
                and cash equivalents .................         457       (2,036)
Effect of exchange rates on cash and cash
     equivalents .....................................          40          (65)

Cash and cash equivalents at beginning of
     period ..........................................       3,297        5,941
                                                           -------      -------

Cash and cash equivalents at end of period ...........     $ 3,794        3,840
                                                           =======      =======

Supplemental  disclosure of cash flow
     information:  Cash paid during the
     period for:
           Interest ..................................     $     2         --
                                                           =======      =======
           Income taxes ..............................     $   132         --
                                                           =======      =======

The  accompanying  notes are an integral  part of these  condensed  consolidated
financial statements.


                                       5



BIOSOURCE INTERNATIONAL, INC. AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED UNAUDITED FINANCIAL STATEMENTS


1.   BASIS OF PRESENTATION

The  accompanying  condensed  consolidated  financial  statements  of  BioSource
International, Inc. (the "Company," "we," "us," or "our") are unaudited and have
been  prepared  pursuant  to the rules and  regulations  of the  Securities  and
Exchange Commission regarding interim financial reporting.  Accordingly, they do
not include all of the information and footnotes  required by generally accepted
accounting  principles for complete  financial  statements and should be read in
conjunction  with  the  consolidated  financial  statements  and  notes  thereto
included in our Annual  Report on Form 10-K for the fiscal  year ended  December
31, 2003. In the opinion of management,  the  accompanying  unaudited  condensed
consolidated financial statements include all adjustments that are necessary for
a fair presentation.  The results of operations for the three months ended March
31,2004,  are not necessarily  indicative of results to be expected for the full
fiscal year.

2.   GENERAL

The  Company  develops,  manufactures,  markets  and  distributes  products  and
services that are widely used in biomedical research.  Our products and services
enable  scientists to better  understand the  biochemistry,  immunology and cell
biology of the human body, aging and certain diseases such as cancer,  arthritis
and other inflammatory diseases,  AIDS and certain other infectious diseases. We
have a wide  variety of  products,  including  immunoassay  and ELISA test kits;
immunological reagents, including bioactive proteins (cytokines,  growth factors
and  adhesion  molecules),   oligonucleotides,  and  monoclonal  and  polyclonal
antibodies. We also manufacture and market custom oligonucleotides, peptides and
antibodies  to the  specifications  of our  customers.  We use  recombinant  DNA
technology to produce cytokines and other proteins.

RECENTLY ISSUED ACCOUNTING STANDARDS

In  January  2003,  the  Financial   Accounting   Standards  Board  issued  FASB
Interpretation  No. 46,  "Consolidation of Variable Interest Entities" (FIN 46).
This  interpretation  clarifies the application of Accounting  Research Bulletin
No. 51, "Consolidated  Financial Statements" (ARB 51), and requires companies to
evaluate variable interest  entities for specific  characteristics  to determine
whether  additional   consolidation  and  disclosure  requirements  apply.  This
interpretation is immediately  applicable for variable interest entities created
after January 31, 2003,  and applies to the first fiscal year or interim  period
beginning after June 15, 2003 for variable  interest  entities acquired prior to
February 1, 2003. The adoption of this interpretation did not have any impact on
our financial  position or results of  operations.  In December  2003,  the FASB
revised FIN 46 to exempt certain  entities from its  requirements and to clarify
certain issues arising during the  implementation of FIN 4. The adoption of this
revised  interpretation  in the first  quarter of 2004 did not have an impact on
our consolidated financial statements.

3.   INVENTORIES (AMOUNTS IN THOUSANDS):

                                            MARCH 31, 2004    DEC. 31, 2003
                                            --------------    -------------

         Raw materials ................          $3,197           3,193
         Work in process ..............             503             455
         Finished goods ...............           5,470           5,426
                                                 ------          ------
                                                 $9,170           9,074
                                                 ======          ======


                                       6



4.   PROPERTY AND EQUIPMENT (AMOUNTS IN THOUSANDS):

                                                          MARCH 31,   DEC. 31,
                                                            2004        2003
                                                          --------    --------

         Machinery and equipment ......................   $  9,463       9,225
         Office furniture and equipment ...............      4,320       4,270
         Leasehold improvements .......................      1,942       1,874
                                                          --------    --------
                                                            15,725      15,369
         Less accumulated depreciation and amortization     (9,534)     (9,134)
                                                          --------    --------
                                                          $  6,191       6,235
                                                          ========    ========

5.   STOCK OPTIONS, PURCHASE PLANS AND WARRANTS

The  Company  currently  has two stock  option  plans in place - the 1993  Stock
Incentive  Plan (the "1993  Plan") and the 2000 BSI  non-qualified  stock option
Plan (the "2000 Plan").  The Company is also a party to a stock option agreement
with a former Chief Executive Officer.

Under the 2000 Plan,  non-qualified  stock  options may be granted to  full-time
employees,  part-time  employees,  directors and  consultants  of the Company to
purchase a maximum of 2,000,000  shares of the company's  common stock.  Options
granted  under the 2000 Plan vest and are generally  exercisable  at the rate of
25% each  year  beginning  one year from the date of  grant.  The stock  options
generally expire ten years from the date of grant.

Under the 1993 Plan,  incentive and non-qualified  stock options were granted to
full-time  employees,  part-time  employees,  directors and  consultants  of the
Company to  purchase  a maximum of  2,000,000  shares of common  stock.  Options
granted under the 1993 Plan vested and were generally exercisable at the rate of
25% each  year  beginning  one year from the date of  grant.  The stock  options
generally  expired ten years from the date of grant.  On December 31, 2003,  the
1993 Stock Option Plan expired by its own terms. Therefore,  the Company will no
longer grant stock options under that plan.

The Company applies APB Opinion No. 25 in accounting for its stock option grants
to employees and  directors,  and  accordingly,  no  compensation  cost has been
recognized for its stock options in the consolidated financial statements as the
market value of the Company's common stock at the date of grant was equal to its
exercise price on such date. Had the Company determined  compensation cost based
upon the fair value at the grant date for its stock  options under SFAS No. 123,
the Company's  net income would have changed to the pro forma amounts  indicated
below:

                                                    THREE MONTHS ENDED MARCH 31,
                                                          2004         2003
                                                       ---------    ---------
                                           (in thousands, except per share data)
NET INCOME:
    As reported ...................................    $     709          103

         Deduct: Total stock-based employee
         compensation expense determined under
         fair value based method for all awards,
         net of tax effects .......................         (257)        (278)
                                                       ---------    ---------

    Pro forma net income (loss) available to
         common shareholders ......................    $     452         (175)
                                                       =========    =========

NET INCOME (LOSS) PER SHARE:
    Basic - as reported ...........................    $    0.08         0.01
                                                       =========    =========

    Basic - pro forma .............................    $    0.05        (0.02)
                                                       =========    =========

    Diluted - as reported .........................    $    0.07         0.01
                                                       =========    =========

    Diluted - pro forma ...........................    $    0.05        (0.02)
                                                       =========    =========


                                       7



6.   EARNINGS PER SHARE

The  reconciliation  of basic to diluted  weighted  average shares is as follows
(amounts in thousands):

                                                        THREE MONTHS ENDED
                                                             MARCH 31,
                                                        2004           2003
                                                     ---------       --------

Weighted average shares used in
     basic computation ............................      9,395          9,635

Dilutive stock options and warrants ...............        357            391
                                                     ---------       --------

Weighted average shares used for
     diluted computation ..........................      9,752         10,026
                                                     =========       ========

Options to  purchase  757,884  and  1,036,962  shares  were not  included in the
computation  of diluted net income per share for the three month  periods  ended
March  31,  2004  and  2003,   respectively   because   their  effect  would  be
anti-dilutive.

Warrants to purchase  1,287,000  shares at a weighted  average exercise price of
$7.77  per share  were  outstanding  as of March 31,  2004 and 2003 but were not
included in the computation of diluted net income per share for the three months
ended March 31, 2004 and 2003 because their effect would be anti-dilutive.

7.   STOCKHOLDERS' EQUITY

Comprehensive income is determined as follows (amounts in thousands):

                                                        THREE MONTHS ENDED
                                                             MARCH 31,
                                                        2004           2003
                                                     ---------       --------

Net income ........................................  $     709            103

Foreign currency translation adjustments,
   net of tax .....................................       (164)           240
                                                     ---------       --------

Total comprehensive income ........................  $     545            343
                                                     =========       ========

8.   BUSINESS SEGMENTS

The  Company  is  engaged  in a single  industry:  the  licensing,  development,
manufacture, marketing and distribution of immunological reagents, test kits and
oligonucleotides  used  in  biomedical  research  and  human  diagnostics.   Our
customers are not concentrated in any specific  geographic  region and no single
customer accounts for a significant amount of our sales.

Management of the Company has determined  its reportable  segments are strategic
business  units  that offer both sales to  external  customers  from  geographic
company  facilities  and  sales to  external  customers  in  certain  geographic
regions.  These  Strategic  Business  Units  ("SBU's")  are Signal  Transduction
Products,  Cytokine  Products,  and  Custom  Products.   Significant  reportable
business  segments are the United States and European  facilities,  and sales to
external customers are summarized as those located in the United States, Europe,
Japan and other. We evaluate  performance for the  "Sales-from"  segments on net
revenue and profit and loss from  operations.  Our SBU's are managed  separately
because  each  product  group  requires  different  marketing  and  distribution
strategies. Business information is summarized as follows:


                                       8



                                                          THREE MONTHS ENDED
                                                               MARCH 31,
                                                          2004           2003
                                                        --------       --------
SALES - FROM SEGMENTS (IN THOUSANDS):
Net sales to external customers from:
     United States:
         Domestic ................................      $  6,350          6,027
         Export ..................................         1,605          1,116
                                                        --------       --------
                Total United States ..............         7,955          7,143
     Europe ......................................         4,331          3,756
                                                        --------       --------
                Consolidated .....................      $ 12,286         10,899
                                                        ========       ========

Operating income (loss):
     United States ...............................      $   (183)          (737)
     Europe ......................................         1,094            858
                                                        --------       --------
                Consolidated .....................      $    911            121
                                                        ========       ========

SALES - TO SEGMENTS (IN THOUSANDS):
Net sales to external customers in:
     United States ...............................      $  6,352          6,027
     Europe ......................................         3,902          3,286
     Asia-Pacific ................................         1,619          1,235
     Other .......................................           413            351
                                                        --------       --------
                Consolidated .....................      $ 12,286         10,899
                                                        ========       ========

SALES - BY PRODUCT GROUP (IN THOUSANDS):
Net sales by product group:
     Cytokine ....................................      $  5,763          4,920
     Signaling ...................................         2,560          2,250
     Custom ......................................         3,963          3,729
                                                        --------       --------
                Consolidated .....................      $ 12,286         10,899
                                                        ========       ========

9.   LINE OF CREDIT

In  June  2003,  the  Company  established  a  one-year  revolving  loan  with a
commercial  bank that allows the Company to withdraw  from time to time  amounts
that in the aggregate are not to exceed $2,500,000. The loan was established for
working capital and stock repurchase needs, when and as necessary. The principal
terms of the revolving  loan include an interest rate of 2.75% on borrowed funds
and a quarterly  unused balance fee of .375%.  The principal  covenants  include
maintaining quarterly  profitability,  a maximum liability to tangible net worth
ratio of 1.0 to 1.0,  and a minimum  cash  balance of  $750,000 as of the end of
each fiscal quarter.  The Company received a waiver from its commercial bank for
the three months ended  September 30, 2003 and December 31, 2003 with respect to
the  profitability  covenant it maintains on this one-year  revolving  loan. The
Company had no  borrowings  under the  revolving  loan during 2004.  The line of
credit expires on June 30, 2004. The Company currently  anticipates  maintaining
the revolving loan until such time that management believes that working capital
and stock repurchase needs no longer require its availability.


                                       9



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

This  discussion  and analysis of financial  condition and results of operations
should be read in conjunction with the consolidated  financial  statements,  the
notes  thereto and other  information,  including  information  set forth in our
Annual Report on Form 10-K for the fiscal year ended  December 31, 2003, and all
other filings we made with the Securities and Exchange  Commission  from time to
time.

This Form 10-Q contains forward-looking  statements,  which are made pursuant to
the safe-harbor  provisions of the Private  Securities  Litigation Reform Act of
1995.   Within   this  Form  10-Q,   words  such  as   "believes,"   "designed,"
"anticipates," and similar expressions are intended to identify  forward-looking
statements,  but are not the exclusive  means of  identifying  such  statements.
These  forward-looking  statements  involve a number of risks and uncertainties,
including  the timely  development  and market  acceptance  of our  products and
technologies  and other factors  described  throughout this Form 10-Q and in our
other filings with the  Securities and Exchange  Commission.  The actual results
that we achieve may differ from any forward-looking statements due to such risks
and  uncertainties.  We do not undertake any  obligation to revise or update any
forward-looking  statements in order to reflect events or circumstances that may
arise after the date of this report.

OVERVIEW -

BioSource develops, manufactures,  markets and distributes products and services
that are widely used in biomedical  research.  Its products and services  enable
scientists to better understand the biochemistry, immunology and cell biology of
the human body, aging and certain  diseases such as cancer,  arthritis and other
inflammatory  diseases,  AIDS and certain other infectious diseases. The Company
has a wide variety of products,  including  immunoassay  and ELISA test kits and
immunological reagents, including bioactive proteins (cytokines,  growth factors
and  adhesion  molecules),   oligonucleotides,  and  monoclonal  and  polyclonal
antibodies.  The Company also manufactures and markets custom  oligonucleotides,
peptides  and  antibodies  to the  specifications  of  its  customers.  It  uses
recombinant  DNA  technology  to produce  cytokines  and other  proteins and has
registered its analyte specific  reagents with the FDA for which it has received
a license to sell such products as Class I Medical Devices.  The Company markets
these  products to in vitro  diagnostic  manufacturers  and  clinical  reference
laboratories  as "active  ingredients"  in the tests  those  parties  produce to
identify specific  diseases or conditions.  In order to market these products as
medical  devices,  BioSource  is  required  to be in  compliance  with the FDA's
Current Good  Manufacturing  Practices and Regulations.  The Company believes it
offers a unique  combination  of  technological,  production,  and  research and
development  skills  resulting  in a spectrum of products  and  services for the
worldwide pharmaceutical and biotechnology industries.

The Company  manufactures  products for inventory and typically  ships  products
shortly after receipt of orders and  anticipates  that it will continue to do so
in the future. Accordingly,  the Company has not developed a significant backlog
of  products  and does not  anticipate  it will  develop a  material  backlog of
products in the future.

During 2003, to better drive sales and profitability growth, and to focus on key
market opportunities, the Company began analyzing its business as three separate
product categories,  or Strategic Business Units,  "SBUs." These SBUs consist of
Signal Transduction  Products,  Cytokine Products,  and Custom Products.  Signal
Transduction  Products  consist of the  proteins,  antibodies,  assays and other
reagents  used  to  study  internal  cellular  processes.   Our  phosphospecific
antibodies and  phosphoELISA(TM)s  are included in this SBU.  Cytokine  Products
include the  proteins,  antibodies,  assays and other  reagents that are used to
study the processes by which cells communicate.  Interleukin,  growth factor and
other biological  response modifier products are included in this group.  Custom
Products includes oligonucleotides, custom peptides and antibodies, cell culture
and diagnostics and other reagents not specifically categorized.

In November  2003, the Company hired Terrance J. Bieker as its new President and
Chief Executive Officer. With Mr. Bieker's leadership, during the fourth quarter
of 2003,  the Company  developed and  implemented a business plan that clarifies
the Company's strategic focus for the future. This fundamental shift in strategy
is to focus the  Company's  time,  effort and  financial  resources  on its core
strengths as an assay company.  These assay products are higher margin  products
and generally fall into two categories,  Cytokine and Signal Processing  Assays.
The Company will be placing a more direct focus in the sales of cytokine  assays
and their directly related products and the sales of signal  transduction assays
and their directly  related  products.  This strategic plan is designed to allow


                                       10



BioSource  to penetrate  and  increase  its market  share in the cytokine  assay
market and continue to maintain a strong  leadership  position in the  signaling
market,  which includes the trademarked  PhosphoELISA(TM)  assays. This strategy
will focus the Company's direction on these high margin products and allow it to
more effectively market their complimentary product lines, including our Phospho
Site Specific Antibodies, or PSSA's, and our sera and media and custom products:
peptides, antibodies and oligonucleotides.

As a result of this new  strategic  direction,  certain  assumptions  related to
fixed,  working and human  assets have been and will  continue to be  evaluated.
With a more  focused  approach on assay kits and the  directly  related  product
lines,  certain  other  non-strategic  products have been and may continue to be
discontinued.  The Company realizes that certain of its products may not possess
the  characteristics  for significant growth or adequate profit margins in order
for the Company to continue to provide such products.  This strategic  shift has
and will  continue to cause the Company to review its existing  product line and
certain inventory levels and values.

The  implementation of this new strategy is intended to bring continued positive
organic  growth  to the  Company's  sales  for 2004 and  beyond.  The  increased
investment  in sales and  marketing,  in  conjunction  with our new  strategy is
designed to bring a more focused  approach to promoting  and selling  assays and
their directly related products.  In addition,  we have incorporated a corporate
account  strategy into our selling  approach  which we believe will help support
our organic  sales  growth.  With this  strategy of a more  focused  approach on
assays and their directly  related  product lines the Company  believes  overall
gross profit and gross product  margins should improve in 2004, when compared to
2003 due to its more focused approach on selling assays, a higher margin product
than  many of its  other  products.  As a  result,  the  Company  also  believes
operating  results  should also improve in 2004  compared to 2003.  Management's
longer term  financial  objective  is to generate  increasing  annual  operating
profits to the Company.

CRITICAL ACCOUNTING POLICIES

General

Our discussion and analysis of our financial condition and results of operations
are based upon our consolidated  financial statements,  which have been prepared
in  accordance  with  accounting  principles  generally  accepted  in the United
States.  The  preparation  of these  financial  statements  requires  us to make
estimates and judgments that affect the reported amounts of assets, liabilities,
revenues  and  expenses,   and  related  disclosure  of  contingent  assets  and
liabilities.  On an on-going  basis,  the Company  evaluates its estimates.  The
Company  bases its  estimates  on  historical  experience  and on various  other
assumptions  that are believed to be  reasonable  under the  circumstances,  the
results of which form the basis for making  judgments  about the carrying values
of assets and  liabilities  that are not readily  apparent  from other  sources.
Actual results may differ from these estimates  under  different  assumptions or
conditions. Specifically, management must make estimates in the following areas:


         ALLOWANCE FOR DOUBTFUL ACCOUNTS.


         The  Company had  $7,430,000  in gross trade  accounts  receivable  and
         $213,000 in allowance for doubtful accounts on the consolidated balance
         sheet at  March  31,  2004.  The  Company  has  procedures  in place to
         adequately  review the credit  worthiness  of new customers and also to
         properly review orders from existing customers to determine if a change
         in credit terms is warranted.  The Company determines its allowance for
         doubtful  accounts by looking at its entire  outstanding  invoices and,
         based on certain  criteria  including past payment  history and current
         credit worthiness, determines specific customers and invoices that need
         a  specific  allowance.  This  review  of our  allowance  for  doubtful
         accounts is done on a regular basis  throughout  the year.  The Company
         has accounts  receivable amounts from certain customers as of March 31,
         2004 whereby,  if their financial  condition  changed and a significant
         allowance needed to be created, could have a material adverse effect on
         the Company's financial results for 2004.


         INVENTORY ADJUSTMENTS TO LOWER OF COST OR MARKET.


         The Company  reviews the components of its inventory on a regular basis
         for excess,  obsolete and impaired  inventory based on estimated future
         usage and sales. The  manufacturing  process for antibodies has and may
         continue to produce  quantities  substantially  in excess of forecasted
         usage and anticipated  antibody sales


                                       11



         volumes are highly uncertain and realization of individual product cost
         may  not  occur.  As  a  result,   the  Company   reserves  its  entire
         manufactured  antibody  inventory at 100% of its value. As of March 31,
         2004,  the Company had  $5,035,000  of  manufactured  antibodies in its
         inventory and a reserve for these antibodies totaling  $5,035,000.  The
         Company  will  continue  to  monitor  its  antibody  inventory  and the
         continued  need for a 100% reserve.  Additionally,  material  inventory
         write-downs in our inventory can occur if competitive conditions or new
         product  introductions  by our  customers  or us vary from our  current
         expectations.

         DEFERRED TAX ASSETS AND DEFERRED INCOME TAXES.

         The  Company  has  $12,441,000  in  deferred  income  tax assets on its
         consolidated  balance sheet as of March 31, 2004. A large  component of
         the  Company's  deferred tax assets is its net  operating  losses.  The
         federal NOL's are available to offset future  taxable  income,  if any,
         through 2020 to 2023.  The state NOL's are  available to offset  future
         taxable income, if any, through 2006 to 2023.

         As of March  31,  2004,  the  Company  has a  valuation  allowance  for
         deferred tax assets related to net operating  losses it has accumulated
         for the State of  Massachusetts.  This allowance is included in the net
         deferred  tax assets on its  balance  sheet as of March 31,  2004.  The
         ability to realize  these net deferred tax assets  depends  entirely on
         the Company  generating  taxable income in the future.  The Company has
         used historical information as well as a projected financial outlook to
         project taxable income amounts.  The Company  believes,  except for the
         valuation allowance  previously  discussed,  it is more likely than not
         that they will be able to realize the current  value of net benefits in
         the future.  A material  change in our  expected  realization  of these
         assets  would  occur if the  ability to deduct  tax loss  carryforwards
         against future taxable income is altered. If our projections  involving
         tax  planning  and  operating  strategies  do  not  materialize  or  if
         significant   changes  in  tax  laws  occur   within  the  various  tax
         jurisdictions in which we operate,  we would have to set up a valuation
         allowance  against our deferred tax assets that could materially affect
         our tax expense and our financial results.

The Company believes the following critical  accounting policies affect our more
significant  judgements and estimates  used in  preparation of our  consolidated
financial statements.

         REVENUE  RECOGNITION.  The Company's revenue is generated from the sale
         of products primarily manufactured internally.  The Company does have a
         small amount of products that are sold on an original equipment ("OEM")
         basis.  The Company sells standard and custom products  directly to end
         users and distributors and recognizes revenue upon transfer of title to
         the  customer,  which occurs upon  shipment.  General sales and payment
         terms  to  distributors  are  similar  to  those  granted  to end  user
         customers.  Certain end user  customers  prepay for product and request
         shipment  of the  product  at  future  dates,  primarily  sera or media
         products.  In such cases,  the Company records  deferred  revenue until
         such time as a product is shipped to a customer.  Approximately  27% of
         the  Company's net sales for the three months ended March 31, 2004 were
         to  distributors  compared to 25% for the three  months ended March 31,
         2003.  The Company's  distribution  agreements do not provide a general
         right  of  return.  The  amount  of  the  Company's  products  held  by
         distributors in inventory is not believed to be substantial.

         The Securities and Exchange  Commission's Staff Accounting Bulletin No.
         104,  "Revenue  Recognition,"  ("SAB  104")  provides  guidance  on the
         application  of generally  accepted  accounting  principles to selected
         revenue  recognition  issues.  The  Company  believes  that its revenue
         recognition  policy is consistent  with this guidance and in accordance
         with generally accepted accounting principles. We do not anticipate any
         changes to our revenue recognition and shipping policies in the future.

         LONG-LIVED  ASSETS.  It is our policy,  and in accordance with SFAS No.
         144,  to account  for  long-lived  assets,  including  intangibles,  at
         amortized  cost.  As part of an  ongoing  review of the  valuation  and
         amortization  of long-lived  assets,  management  assesses the carrying
         value of such assets if facts and  circumstances  suggest that they may
         be impaired.  If this review indicates that long-lived  assets will not
         be recoverable,  as determined by a  non-discounted  cash flow analysis
         over the  remaining  amortization  period,  the  carrying  value of the
         Company's  long-lived  assets  would be reduced to its  estimated  fair
         value based on discounted  cash flows.  No impairment  indicators  were
         identified  during  the  first  quarter  of 2004 and  accordingly,  the
         Company has determined  that its long-lived  assets are not impaired as
         of March 31, 2004.


                                       12



CONSOLIDATED RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 2004

NET SALES: Net sales for the quarter ended March 31, 2004 were $12.3 million, an
increase of $1.4  million or 13%  compared  to net sales for the  quarter  ended
March 31, 2003. The Company's revenues  benefited by a $594,000,  or 6% positive
impact of foreign exchange for the quarter ended March 31, 2004 when compared to
the quarter ended March 31, 2003.

For the  three  months  ended  March 31,  2004,  sales of the  Company's  Signal
Transduction  Products,  grew 14% compared to the comparable prior year quarter,
from $2.3 million to $2.6  million.  Signal  Transduction  Products  represented
approximately  21% of our total sales for both the three  months ended March 31,
2004 and 2003. The Company  believes the signal  transduction  market is growing
and that it has opportunities for continued growth in this market. The Company's
sales growth in its Cytokine  Products for the quarter ending March 31, 2004 was
17%,  increasing from $4.9 million to $5.7 million  compared to the three months
ended March 31, 2003. The Cytokine Products  represent  approximately 47% of our
total  sales for the three  months  ended  March 31,  2004 and 45% for the three
months  ended March 31,  2003,  respectively.  The  Cytokine  market is a mature
market  which the Company  believes  continues to have  opportunities  for solid
sales growth through  focused sales and marketing  efforts and through  targeted
research and development  activities.  The Company's Custom Product lines, which
represented  approximately  32% and 34% of our total sales for the three  months
ended  March  31,  2004 and 2003  respectively,  increased  7%  compared  to the
comparable  prior year  quarter,  from $3.7 million to $4.0  million.  Increased
diagnostic,  sera and media and custom  antibody sales were offset by a decrease
in oligonucleotide and custom peptide sales.

For the three months  ended March 31, 2004,  the  Company's  North  American net
sales  increased  5% as  compared  to the three  months  ended  March 31,  2003.
European  sales for the three  months  ended  March 31,  2004  increased  19% as
compared to the comparable  prior year period due in part to increased  sales in
our  European  signaling  products.  Sales  in Japan  and the rest of the  world
increased  28%,  for the three  months  ended  March 31, 2004 as compared to the
three months  ended March 31, 2003.  The increase in sales in Japan and the rest
of the world in the first  quarter of 2004 compared to the first quarter of 2003
is primarily attributable to increased sales to our Japanese distributors.

GROSS  PROFIT:  Gross profit margin was 56% for the three months ended March 31,
2004 and 57% for the three months ended March 31, 2003. The Company's  increases
in its Custom and European  gross  margins when compared to the first quarter of
2003 were offset by a decline in gross  margins in the US. The Company  does not
believe this is  indicative of any trends and expects its gross profit margin to
fluctuate somewhat during the remaining quarters of 2004.

RESEARCH AND DEVELOPMENT:  Research and development expense for the three months
ended March 31, 2004 and 2003 was $1.4 million and $2.0 million and  represented
11% and 18% of sales,  respectively.  The decrease of approximately  $600,000 is
related to  reductions in payroll and related costs and general lab supplies and
reflects  the  Company's  efforts  to  align  R  &  D  investment  to  its  core
capabilities  and new strategic  direction.  The Company  anticipates  its R & D
expenses to moderately increase in the remaining quarters of 2004.

SALES AND  MARKETING:  Selling and marketing  expenses were $2.5 million for the
three  months  ended March 31, 2004 and $2.4  million for the three months ended
March 31, 2003, representing 20% and 22% of sales, respectively. The increase in
sales and marketing is due to modest  increases in payroll and office  expenses.
The Company  anticipates its sales and marketing  expenses to remain  relatively
constant throughout the remaining quarters of 2004

GENERAL  AND  ADMINISTRATIVE:  General  and  administrative  expenses  were $1.9
million for the three  months  ended March 31,  2004,  and $1.6  million for the
three months ended March 31, 2003, an increase of approximately  $300,000.  This
increase was due primarily to increases in benefits, legal, accounting and other
consulting fees. As a percentage of sales,  general and administrative  expenses
represented  16% and 14% for the three  months  ended  March 31,  2004 and 2003,
respectively.  The Company  anticipates its general and administrative  expenses
will  rise  slightly  in the  remaining  quarters  of 2004 due to  increases  in
benefits,  legal and accounting fees related to implementation of new regulatory
requirements resulting from the Sarbanes-Oxley Act of 2002.


                                       13



AMORTIZATION OF INTANGIBLE ASSETS: Amortization of intangible assets for each of
the three  months  ended  March  31,  2004 and 2003  amounted  to  $139,000  and
$145,000,  respectively,  and was related  primarily to the  amortization of the
identifiable intangible assets.

INTEREST  INCOME,  NET: Net interest income for the three months ended March 31,
2004 and 2003 was $11,000 which primarily  resulted from interest income derived
from an income tax refund.

INCOME TAX  EXPENSE:  The  Company's  effective  income tax rate was 21% with an
income tax  expense of  $188,000  for the  quarter  ended  March 31,  2004.  The
Company's  income  taxes  have  and may  continue  to  fluctuate  in the  future
depending on a number of factors,  including the ability to use its deferred tax
assets as of March 31,  2004.  The  Company  believes it is more likely than not
that it will be able to use those assets. In addition,  the Company continues to
benefit from R & D and other tax credits  which,  when applied to income  levels
for the periods  presented,  is resulting in effective  tax rates lower than the
current applicable federal and state statutory rates.

LIQUIDITY AND CAPITAL RESOURCES:

Cash and cash equivalents equal to $3,794,000 as of March 31, 2004, increased by
$497,000 from  $3,297,000 at December 31, 2003. For the three months ended March
31, 2004, the Company received $65,000 from the issuance of common stock related
to the  exercise of stock  options and spent  $502,000 on capital  expenditures,
primarily for the purchase of laboratory and manufacturing  equipment.  Net cash
provided from operating activities for the three months ended March 31, 2004 was
$894,000,  derived  primarily from  operating  income for the three months ended
March 31,  2004.  Working  capital,  which is the excess of current  assets over
current  liabilities,  was  $16,442,000  at  March  31,  2004,  as  compared  to
$15,663,000 at December 31, 2003, representing an increase of $779,000.

The Company has a stock  repurchase  program under which it can repurchase up to
$15 million of its common stock.  Consistent with its determination to adopt the
stock  repurchase  program in October  2001,  the  Company's  Board of Directors
continues  to  believe  that the price at which the  Company's  common  stock is
currently  trading is not a proper  reflection of its long-term  value, and that
utilizing the Company's excess cash to repurchase its shares,  in the discretion
of management and when market conditions permit, is an efficient way in which to
continue to  increase  that value.  During the first three  months of 2004,  the
Company  did not  repurchase  any  shares of its  common  stock  under its stock
repurchase  program.  From  October  2001  through May 7, 2004,  the Company has
repurchased  1,536,000  common  shares,  representing  approximately  15% of its
outstanding  common  shares,   with  cash  outlays  totaling   $8,700,000.   All
repurchased shares have been retired.

In  June  2003,  the  Company  established  a  one-year  revolving  loan  with a
commercial  bank that allows the Company to withdraw  from time to time  amounts
that in the aggregate are not to exceed $2,500,000. The loan was established for
working capital and stock repurchase needs, when and as necessary. The principal
terms of the revolving  loan include an interest rate of 2.75% on borrowed funds
and a quarterly  unused balance fee of .375%.  The principal  covenants  include
maintaining quarterly  profitability,  a maximum liability to tangible net worth
ratio of 1.0 to 1.0,  and a minimum  cash  balance of  $750,000 as of the end of
each fiscal quarter.  The Company received a waiver from its commercial bank for
the three months ended  September 30, 2003 and December 31, 2003 with respect to
the  profitability  covenant it maintains on this one-year  revolving  loan. The
Company had no  borrowings  under the  revolving  loan during 2004.  The line of
credit expires on June 30, 2004. The Company currently  anticipates  maintaining
the revolving  loan until such time that  management or the Board  believes that
working capital and stock repurchase needs no longer require its availability.

The Company has never paid  dividends  on common stock and has no plans to do so
in fiscal 2004. Our earnings will be retained for reinvestment in the business.

The  Company  expects to be able to meet its  future  cash and  working  capital
requirements for operations and capital additions  through  currently  available
funds  and  cash  generated  from  operations,  if any.  However,  we may  raise
additional  capital  or  utilize  our  revolving  loan from time to time to take
advantage  of  favorable  conditions  in the  market or in  connection  with our
corporate development activities.


                                       14



                                  RISK FACTORS

You  should  carefully  consider  the  following  risk  factors  and  all  other
information  contained  in this report  before  purchasing  shares of our common
stock.  Investing in our common stock  involves a high degree of risk. If any of
the  following  events or outcomes  actually  occurs,  our  business,  operating
results and financial  condition would likely suffer.  As a result,  the trading
price of our common  stock  could  decline,  and you may lose all or part of the
money you paid to purchase our common stock.

RISKS RELATED TO OUR BUSINESS

FAILURE TO EXECUTE ON OUR NEWLY ADOPTED  LONG-TERM  STRATEGIC  PLAN COULD IMPAIR
OUR BUSINESS.

The  Company  historically  has sought to increase  its sales and  profitability
primarily through the acquisition or internal  development of new product lines,
additional  customers  and new  businesses.  Our  historical  revenue  growth is
primarily attributable to our acquisitions and new product development and, to a
lesser extent, to increased revenues from our existing products.  In the quarter
ended December 31, 2003, we adopted a fundamental shift in strategy to focus our
time, effort and financial  resources on our core strengths as an assay company.
We have built a strategic  plan to continue to penetrate and increase our market
share in the cytokine assay market and continue to maintain a strong  leadership
position in the signal  transduction assay market.  This strategy will focus our
energies  on  these  high  margin  products  and  allow us to pull  through  our
complimentary product lines, including our Phospho Site Specific Antibodies,  or
PSSA's,  sera and  media  and our  custom  products,  peptides,  antibodies  and
oligonucleotides.

Our ability to achieve our new  strategic  objectives  depends upon a variety of
factors, including:

o        the market's continuing acceptance of our assay products;

o        our ability to internally develop new products;

o        our ability to acquire products or licenses to necessary technologies;

o        our ability to facilitate transactions with strategic partners;

o        establishment   of  new   relationships   or   expansion   of  existing
         relationships with customers and suppliers; and

o        availability of capital.

Additionally,   our  shift  in  strategy   has  caused  us  to  evaluate   other
non-strategic  products,  such as outsourced cell surface marker  antibodies and
discontinue  them.  The Company  reviewed  its catalog of products in the fourth
quarter of 2003 and eliminated over 400 non-strategic  products. This evaluation
of catalog  products is expected to continue in the future.  While the impact to
our financial  results from our  continuing  evaluation  of catalog  products is
unknown at this time,  any such  evaluation  could be material to the  operating
results of the Company.

If our  management is unable to manage this  strategic  shift  effectively,  our
operating  results  could  be  adversely  affected.  Moreover,  there  can be no
assurance that our historic rate of growth will continue  through this strategic
shift, that we will continue to successfully  expand or that growth or expansion
will result in profitability.

WE CANNOT GUARANTEE THAT OUR FUTURE ACQUISITIONS WILL BE SUCCESSFUL.

The Company competes for acquisition and expansion  opportunities with companies
which have  significantly  greater  financial and management  resources than us.
There can be no assurance that suitable acquisition or investment  opportunities
will be identified,  that any of these transactions can be consummated, or that,
if acquired,  these new businesses can be integrated successfully and profitably
into our  operations.  These  acquisitions  and  investments  may also require a
significant  allocation of resources,  which will reduce our ability to focus on
the other portions of our business,  including many of the factors listed in the
prior risk factor.


                                       15



REDUCTION  OR DELAYS IN  RESEARCH  AND  DEVELOPMENT  BUDGETS  AND IN  GOVERNMENT
FUNDING MAY NEGATIVELY IMPACT OUR SALES.

Our customers include researchers at pharmaceutical and biotechnology companies,
academic institutions and government and private  laboratories.  Fluctuations in
the  research  and   development   budgets  of  these   researchers   and  their
organizations  could have a  significant  effect on the demand for our products.
Research and  development  budgets  fluctuate  due to numerous  factors that are
outside our control and are difficult to predict, including changes in available
resources,   spending  priorities  and  institutional  budgetary  policies.  Our
business could be seriously damaged by any significant decrease in life sciences
research  and  development  expenditures  by  pharmaceutical  and  biotechnology
companies, academic institutions or government and private laboratories.

A  significant  portion  of our  sales  has been to  researchers,  universities,
government  laboratories and private foundations whose funding is dependent upon
grants from government  agencies such as the U.S. National  Institutes of Health
and similar domestic and international agencies.  Although the level of research
funding has increased  during the past several years, we cannot assure that this
trend will continue.  Government  funding of research and development is subject
to the political  process,  which is  inherently  fluid and  unpredictable.  Our
revenues may be adversely  affected if our customers delay purchases as a result
of uncertainties surrounding the approval of government budget proposals.  Also,
government  proposals to reduce or eliminate  budgetary  deficits have sometimes
included reduced  allocations to the NIH and other government agencies that fund
research and development  activities.  A reduction in government funding for the
NIH or other government research agencies could seriously damage our business.

Many of our customers  receive funds from approved grants at particular times of
the year,  as determined  by the federal  government.  Grants have, in the past,
been frozen for extended periods or have otherwise become unavailable to various
institutions  without advance  notice.  The timing of the receipt of grant funds
affects the timing of purchase  decisions by our customers and, as a result, can
cause fluctuations in our sales and operating results.

WE RELY ON RAW MATERIALS AND SPECIALIZED EQUIPMENT FOR OUR MANUFACTURING,  WHICH
WE MAY NOT ALWAYS BE ABLE TO OBTAIN ON FAVORABLE TERMS.

Our manufacturing  process relies on the continued  availability of high-quality
raw  materials  and  specialized  equipment.  It is  possible  that a change  in
vendors,  or in the quality of the raw  materials  supplied to us, could have an
adverse impact on our manufacturing process and, ultimately,  on the sale of our
finished  products.  We have from time to time  experienced  a disruption in the
quality or availability of key raw materials,  which has created minor delays in
our ability to fill orders for specific test kits. This could occur again in the
future,  resulting in significant delays, and could have a detrimental impact on
the sale of our products and our results of operations.  In addition, we rely on
highly  specialized  manufacturing  equipment  that if damaged or disabled could
adversely   affect  our  ability  to  manufacture  our  products  and  therefore
negatively  impact  our  business.  We  rely  on  the  timely  transport  of raw
materials. Any disruption in transportation systems could have an adverse impact
on our ability to manufacture and supply products.

OUR ABILITY TO RAISE THE CAPITAL  NECESSARY  TO EXPAND OUR BUSINESS OR OTHERWISE
ACHIEVE OUR LONG-TERM OBJECTIVES IS UNCERTAIN.

In the future,  in order to expand our business through internal  development or
acquisitions or to otherwise  achieve our long-term  objectives,  we may need to
raise substantial  additional funds through equity or debt financings,  research
and  development  financings  or  collaborative  relationships.   However,  this
additional  funding  may  not be  available  or,  if  available,  it may  not be
available on economically  reasonable terms. In addition, any additional funding
may result in significant dilution to existing  stockholders.  If adequate funds
are not available,  we may be required to curtail our operations or obtain funds
through collaborative partners that may require us to release material rights to
our products.


                                       16



OUR RESEARCH AND DEVELOPMENT EFFORTS FOR NEW PRODUCTS MAY BE UNSUCCESSFUL.

We incur significant  research and development  expenses to develop new products
and  technologies.  There  can be no  assurance  that any of these  products  or
technologies  will be  successfully  developed  or that  if  developed,  will be
commercially   successful.   In  the  event   that  we  are  unable  to  develop
commercialized  products  from our  research and  development  efforts or we are
unable or  unwilling  to  allocate  amounts  beyond  our  currently  anticipated
research and  development  investment,  we could lose our entire  investment  in
these new  products  and  technologies.  Any failure to  translate  research and
development expenditures into successful new product introductions could have an
adverse effect on our business.

FAILURE TO LICENSE NEW TECHNOLOGIES COULD IMPAIR OUR NEW PRODUCT DEVELOPMENT.

Our business model of providing products to researchers  working on a variety of
genetic projects requires us to develop a wide spectrum of products. To generate
broad product lines it is advantageous to sometimes  license  technologies  from
others rather than depending  exclusively on our own employees.  As a result, we
believe our ability to license new  technologies  from third parties is and will
continue to be important to our ability to offer new products.

In  addition,  from time to time we are notified or become aware of patents held
by third parties that are related to  technologies we are selling or may sell in
the future.  After a review of these patents,  we may decide to obtain a license
for these  technologies  from these third parties or  discontinue  the products.
There  can be no  assurance  that we will be able to  continue  to  successfully
identify new technologies  developed by others.  Even if we are able to identify
new  technologies  of  interest,  we may not be able to  negotiate  a license on
favorable terms, or at all. If we lose the rights to patented technology, we may
need to discontinue  selling certain  products or redesign our products,  and we
may  lose  a  competitive  advantage.  Potential  competitors  could  in-license
technologies  that we fail to license and potentially erode our market share for
certain   products.    Our   licenses    typically   subject   us   to   various
commercialization,  sublicensing,  minimum payment, and other obligations. If we
fail to comply with these  requirements,  we could lose important rights under a
license. In addition, certain rights granted under the license could be lost for
reasons  out of our  control.  For  example,  the  licensor  could  lose  patent
protection for a number of reasons, including invalidity of the licensed patent.
We do not always receive  significant  indemnification  from a licensor  against
third party claims of intellectual property infringement.

We are  currently in the process of  negotiating  several of these  licenses and
expect that we will also negotiate these types of licenses in the future.  There
can be no  assurances  that  we will be able  to  negotiate  these  licenses  on
favorable terms, or at all.

OUR FUTURE SUCCESS  DEPENDS ON THE TIMELY  INTRODUCTION  OF NEW PRODUCTS AND THE
ACCEPTANCE OF THESE NEW PRODUCTS IN THE MARKETPLACE.

Our ability to gain access to technologies  needed for new products and services
also  depends  in  part  on  our  ability  to  convince  licensors  that  we can
successfully  commercialize  their inventions.  We cannot assure that we will be
able to continue to identify new  technologies  developed by others.  Even if we
are  able  to  identify  new  technologies  of  interest,  we may not be able to
negotiate a license on favorable terms, or at all.

IF WE FAIL TO INTRODUCE  NEW  PRODUCTS,  OR OUR NEW PRODUCTS ARE NOT ACCEPTED BY
POTENTIAL CUSTOMERS, WE MAY LOSE MARKET SHARE.

Rapid  technological  change and frequent new product  introductions are typical
for the markets we serve.  Our future success will depend in part on continuous,
timely development and introduction of new products that address evolving market
requirements.   We  believe  successful  new  product  introductions  provide  a
significant  competitive  advantage because customers make an investment of time
in  selecting  and  learning to use a new  product,  and then are  reluctant  to
switch. To the extent we fail to introduce new and innovative  products,  we may
lose market share to our  competitors,  which will be difficult or impossible to
regain.  Any inability,  for  technological  or other reasons,  to  successfully
develop and  introduce  new products  could reduce our growth rate or damage our
business.


                                       17



In the past we have  experienced,  and are likely to  experience  in the future,
delays in the development and introduction of products. We cannot assure that we
will keep pace with the rapid rate of change in life  sciences  research or that
our new products will  adequately  meet the  requirements  of the marketplace or
achieve market  acceptance.  Some of the factors  affecting market acceptance of
new products include:

o        availability, quality and price relative to competitive products;

o        the timing of  introduction  of the  product  relative  to  competitive
         products;

o        customers' opinion of the product's utility;

o        ease of use;

o        consistency with prior practices;

o        scientists' opinion of the product's usefulness;

o        citation of the product in published research; and

o        general trends in life sciences research.

The  expenses  or  losses  associated  with  unsuccessful   product  development
activities  or lack of market  acceptance of our new products  could  materially
adversely affect our business, operating results and financial condition.

The  development,  introduction  and  marketing  of  innovative  products in our
rapidly  evolving  markets will require  significant  sustained  investment.  We
cannot  assure that cash from  operations or other sources will be sufficient to
meet these ongoing requirements.

FAILURE TO ATTRACT AND RETAIN  QUALIFIED  SCIENTIFIC OR PRODUCTION  PERSONNEL OR
LOSS OF KEY MANAGEMENT OR KEY PERSONNEL COULD HURT OUR BUSINESS.

Recruiting  and  retaining  qualified  scientific  and  production  personnel to
perform research and development work and product  manufacturing are critical to
our  success.  We  are in a  very  competitive  industry  and  face  significant
challenges  attracting and retaining this qualified  personnel base. Although we
believe we have been and will be able to attract  and  retain  these  personnel,
there  can be no  assurance  that we will be able to  continue  to  successfully
attract qualified personnel.  In addition,  our anticipated growth and expansion
into areas and  activities  requiring  additional  expertise,  such as  clinical
testing,  government  approvals,  production  and  marketing,  will  require the
addition of new management personnel and the development of additional expertise
by  existing  management  personnel.  The  failure to attract  and retain  these
personnel  or,  alternatively,   to  develop  this  expertise  internally  would
adversely  affect  our  business.  We  generally  do not enter  into  employment
agreements  requiring  these  employees  to continue in our  employment  for any
period of time.

Our success also will continue to depend to a significant  extent on the members
of our  management  team.  We do not maintain any "key man"  insurance  policies
regarding any of these individuals. We may not be able to retain the services of
our executive officers and key personnel or attract additional qualified members
to  management  in the future.  The loss of services  of our key  management  or
employees could have a material adverse effect upon our business.

MANY OF OUR  CUSTOMERS  ARE  OBTAINING  OUR  PRODUCTS  THROUGH NEW  DISTRIBUTION
CHANNELS AND METHODS THAT MAY  ADVERSELY  IMPACT OUR RESULTS OF  OPERATIONS  AND
FINANCIAL CONDITION.

A number of our customers  have developed  purchasing  initiatives to reduce the
number of vendors they purchase  from in order to lower their supply  costs.  In
some cases, these customers have established  agreements with large distributors
which  include  discounts  and the  distributors'  direct  involvement  with the
purchasing process.  For similar reasons,  many larger customers,  including the
federal government, have special pricing arrangements,


                                       18



including  blanket purchase  agreements.  These agreements may limit our pricing
flexibility  with  respect to our  products,  which could  adversely  impact our
business,  financial condition and results of operations. In addition,  although
we accept  and  process  some  orders  through  our  internet  website,  we also
implement  sales through a third party internet  vendor.  Internet sales through
third parties will negatively impact our gross margins because we pay commission
on these internet sales. On the other hand, if we do not enter into arrangements
with  third-party  e-commerce  providers,  we may lose  customers  who prefer to
purchase  products using these web sites. Our business may be harmed as a result
of these web sites or other sales methods which may be developed in the future.

WE RELY ON AIR TRANSPORT TO SHIP PRODUCTS TO OUR CUSTOMERS

Any disruption in standard air transport systems could have an adverse effect on
our business.

WE RELY ON INTERNATIONAL SALES, WHICH ARE SUBJECT TO ADDITIONAL RISKS.

International sales accounted for approximately 48% of our revenues in the first
three  months of 2004 and 45% of our revenues in the first three months of 2003.
International  sales can be subject to many inherent risks that are difficult or
impossible for us to predict or control, including:

o        unexpected changes in regulatory requirements and tariffs;

o        difficulties and costs associated with in staffing and managing foreign
         operations, including foreign distributor relationships;

o        longer  accounts  receivable   collection  cycles  in  certain  foreign
         countries; adverse economic or political changes;

o        unexpected changes in regulatory requirements;

o        more limited protection for intellectual property in some countries;

o        changes in our  international  distribution  network  and direct  sales
         force;

o        potential trade  restrictions,  exchange controls and import and export
         licensing requirements;

o        problems in collecting accounts receivable; and

o        potentially adverse tax consequences of overlapping tax structure.

IMPAIRMENT OF THE ABILITY TO TRANSPORT GOODS INTERNATIONALLY.

We intend to continue  generating  revenues  from sales outside North America in
the future.  Future  distribution of our products outside North America also may
be subject to greater governmental regulation. These regulations,  which include
requirements for approvals or clearance to market,  additional time required for
regulatory  review and sanctions  imposed for  violations,  as well as the other
risks indicated in the bullets listed above, vary by country. We may not be able
to obtain  regulatory  approvals in the countries in which we currently sell our
products  or in  countries  where we may sell our  products  in the  future.  In
addition,  we may be required to incur significant costs in obtaining  necessary
regulatory  approvals.  Failure to obtain necessary  regulatory approvals or any
other failure to comply with regulatory  requirements could result in a material
reduction in our revenues and earnings.

We also  depend  on  third-party  distributors  for a  material  portion  of our
international sales. If we lose or suffer any significant  reduction in sales to
any material distributor, our business could be materially adversely affected.

In addition, approximately 35% of our sales for the three months ended March 31,
2004 were made in foreign  currencies,  primarily  Euros and British  pounds.  A
significant  portion of the foreign  currencies in which we conduct our business
is currently  denominated in Euros.  The Company is not certain about the effect
of the Euro on our business,  financial  condition or results of operations.  In
the past, gains and losses on the collection of our accounts


                                       19



receivable  arising from  international  operations have contributed to negative
fluctuations in our results of operations. In general, increases in the exchange
rate of the United  States  dollar to foreign  currencies  cause our products to
become  relatively more expensive to customers in those countries,  leading to a
reduction in sales or profitability in some cases. We historically have not, and
currently  are not,  using  hedging  transactions  or other  means to reduce our
exposure to fluctuations in the value of the United States dollar as compared to
the foreign currencies in which many of our sales are made.

OUR OPERATING RESULTS MAY FLUCTUATE.

Our operating results may vary significantly quarter to quarter and from year to
year as a result of a variety of factors. These factors include:

o        level of demand for our products;

o        changes in our customer and product mix;

o        timing of acquisitions and investments in infrastructure;

o        competitive conditions;

o        timing and extent of intellectual property litigation;

o        exchange rate fluctuations; and

o        general economic and political conditions.

We  believe  that  quarterly  comparisons  of  our  financial  results  may  not
necessarily  be  meaningful  and should not be relied upon as an  indication  of
future  performance.  Additionally,  if our  operating  results  in one or  more
quarters do not meet the expectations of security analysts or others,  the price
of our common stock could be materially adversely affected.

Our  continued  investment  in product  development  and sales and marketing are
significantly ongoing expenses. If revenue in a particular period falls short of
expectations,  we may not be able to reduce  significantly  our expenditures for
that period,  which would materially  adversely affect the operating results for
that period.

WE MAY BE UNABLE TO PROTECT OUR TRADEMARKS, TRADE SECRETS AND OTHER INTELLECTUAL
PROPERTY RIGHTS THAT ARE IMPORTANT TO OUR BUSINESS.

We regard our  trademarks,  trade secrets and other  intellectual  property as a
component of our success.  We rely on trademark law and trade secret  protection
and  confidentiality  and/or  license  agreements  with  employees,   customers,
partners and others to protect our intellectual  property.  Effective  trademark
and trade secret  protection  may not be available in every country in which our
products are  available.  We cannot be certain that we have taken adequate steps
to protect our intellectual property, especially in countries where the laws may
not  protect  our  rights as fully as in the United  States.  In  addition,  our
third-party  confidentiality  agreements can be breached and, if they are, there
may not be an  adequate  remedy  available  to us. If our trade  secrets  become
known, we may lose our competitive position.

INTELLECTUAL PROPERTY OR OTHER LITIGATION COULD HARM OUR BUSINESS.

Litigation regarding patents and other intellectual property rights is extensive
in the biotechnology  industry. We are aware that patents have been applied for,
and in some  cases  issued to others,  claiming  technologies  that are  closely
related to ours. As a result,  and in part due to the  ambiguities  and evolving
nature  of  intellectual  property  law,  we  periodically  receive  notices  of
potential  infringement  of  patents  held by others.  Although  to date we have
successfully  resolved these types of claims, we may not be able to do so in the
future.


                                       20



In the event of an intellectual  property dispute, we may be forced to litigate.
This  litigation  could  involve  proceedings  declared  by the U.S.  Patent and
Trademark Office or the International  Trade Commission,  as well as proceedings
brought directly by affected third parties. Intellectual property litigation can
be extremely expensive,  and these expenses,  as well as the consequences should
we not prevail, could seriously harm our business.

If a third party claimed an intellectual property right to technology we use, we
might need to  discontinue  an  important  product or  product  line,  alter our
products  and  processes,  pay  license  fees or  cease  our  affected  business
activities.  Although  we might under  these  circumstances  attempt to obtain a
license to this intellectual  property, we may not be able to do so on favorable
terms, or at all.

In addition to intellectual property litigation,  other substantial,  complex or
extended  litigation could result in large expenditures by us and distraction of
our management. For example, lawsuits by employees, stockholders,  collaborators
or  distributors  could be very costly and  substantially  disrupt our business.
Disputes from time to time with companies or individuals are not uncommon in our
industry,  and we cannot  assure you that we will always be able to resolve them
out of court.

ACCIDENTS RELATED TO HAZARDOUS MATERIALS COULD ADVERSELY AFFECT OUR BUSINESS.

Portions  of  our  operations  require  the  controlled  use  of  hazardous  and
radioactive materials. Although we believe our safety procedures comply with the
standards prescribed by federal, state, local and foreign regulations,  the risk
of  accidental  contamination  of property or injury to  individuals  from these
materials cannot be completely eliminated. In the event of an accident, we could
be liable for any damages that result, which could seriously damage our business
and results of operations.

OUR SALES ARE SUBJECT TO  SEASONALITY,  WHICH MEANS THAT WE HAVE LESS REVENUE IN
SOME MONTHS.

We  experience  a slowing  of sales in  Europe  during  the  summer  months  and
worldwide during the Christmas holidays.  Generally, our fourth quarter revenues
are lower than our revenues in each of the first three  quarters of the year. We
believe  that  period to period  comparisons  of our  operating  results may not
necessarily be reliable indicators of our future performance.  It is likely that
in some future period our operating  results will not meet expectations or those
of public market analysts,  which could result in reductions in the market price
of our common stock.

POTENTIAL  PRODUCT  LIABILITY  CLAIMS COULD  AFFECT OUR  EARNINGS AND  FINANCIAL
CONDITION.

We face a potential risk of liability claims based on our products and services,
and we have faced such claims in the past. We carry product liability  insurance
coverage  which is  limited  in scope  and  amount  but which we  believe  to be
adequate.  We cannot assure you, however,  that we will be able to maintain this
insurance at reasonable cost and on reasonable terms. We also cannot assure that
this insurance will be adequate to protect us against a product liability claim,
should one arise.

THE  LABOR  LAWS  APPLICABLE  TO  OUR  EMPLOYEES  IN  EUROPE  MAY  RESTRICT  THE
FLEXIBILITY OF OUR MANAGEMENT.

As of May 1,  2004,  71 of our 258  employees  worked for our  BioSource  Europe
subsidiary,  which is located in Nivelles, Belgium. As a result of Belgian labor
laws,  we are  required  to make  specified  severance  payments in the event we
terminate a European employee. Accordingly, our management may be limited by the
application of the Belgian labor laws in the  determination  of staffing levels,
and may have less flexibility in making such determinations than our competitors
whose employees are not subject to similar labor laws.

                       RISKS ASSOCIATED WITH OUR INDUSTRY

THE BIOMEDICAL  RESEARCH PRODUCTS  INDUSTRY IS VERY  COMPETITIVE,  AND WE MAY BE
UNABLE TO CONTINUE TO COMPETE EFFECTIVELY IN THIS INDUSTRY IN THE FUTURE.

We are engaged in a segment of the biomedical research products industry that is
highly  competitive.  We compete with many other  suppliers and new  competitors
continue to enter the markets. Many of our competitors, both in the


                                       21



United   States  and   elsewhere,   are  major   pharmaceutical,   chemical  and
biotechnology  companies,  and many of them have  substantially  greater capital
resources, marketing experience, research and development staffs, and facilities
than we do. Any of these companies could succeed in developing products that are
more  effective  than the  products  that we have or may develop and may also be
more successful  than us in producing and marketing  their  products.  We expect
this  competition  to continue and intensify in the future.  Competition  in our
markets is primarily driven by:

o        product performance, features and liability;

o        price;

o        timing of product introductions;

o        ability to develop,  maintain  and  protect  proprietary  products  and
         technologies;

o        sales and distribution capabilities;

o        technical support and service;

o        brand royalty;

o        applications support; and

o        breadth of product line.

If a competitor develops superior  technology or cost-effective  alternatives to
our products, our business,  financial condition and results of operations could
be materially adversely affected.

Our  competitors  have in the past and may in the  future  compete  by  lowering
prices.  Our failure to anticipate and respond to price competition could reduce
our revenues and profits, and may damage our market share.

Our industry has also seen substantial  consolidation in recent years, which has
led to the creation of  competitors  with  greater  financial  and  intellectual
property resources than us. In addition, we believe that the success that others
have had in our industry will attract new  competitors.  Some of our current and
future  competitors  also may cooperate to better compete against us. We may not
be able to compete  effectively  against  these  current or future  competitors.
Increased competition could result in price reductions for our products, reduced
margins  and loss of market  share,  any of which  could  adversely  impact  our
business, financial condition and results of operations.

AS A  RESULT  OF  CONSOLIDATION  IN THE  PHARMACEUTICAL  INDUSTRY,  WE MAY  LOSE
EXISTING CUSTOMERS OR HAVE GREATER DIFFICULTY OBTAINING NEW CUSTOMERS.

In recent  years,  the  United  States  pharmaceutical  industry  has  undergone
substantial  consolidation.  As part of many  business  combinations,  companies
frequently  reduce the number of suppliers  used and we may not be selected as a
supplier  after  any  business  combination.   Further,   mergers  or  corporate
consolidations  in the  pharmaceutical  industry could cause us to lose existing
customers and potential  future  customers,  which could have a material adverse
effect on our business, financial condition and results of operations.

WE ARE CURRENTLY SUBJECT TO GOVERNMENT REGULATION.

Our business is currently  subject to regulation,  supervision  and licensing by
federal,  state and local governmental  authorities.  Also, from time to time we
must expend  resources  to comply  with newly  adopted  regulations,  as well as
changes in existing regulations. If we fail to comply with these regulations, we
could be subject to disciplinary actions or administrative  enforcement actions.
These actions could result in penalties, including fines.


                                       22



                     RISKS ASSOCIATED WITH OUR COMMON STOCK

OUR STOCK PRICE HAS BEEN VOLATILE.

Our common  stock is quoted on the NASDAQ  National  Market,  and there has been
substantial  volatility  in the market  price of our common  stock.  The trading
price of our common stock has been,  and is likely to continue to be, subject to
significant fluctuations due to a variety of factors, including:

o        fluctuations in our quarterly operating and earnings per share results;

o        the gain or loss of significant contracts;

o        loss of key personnel;

o        announcements of technological innovations or new products by us or our
         competitors;

o        delays in the development and introduction of new products;

o        legislative or regulatory changes;

o        general trends in the industry;

o        recommendations  and/or  changes  in  estimates  by equity  and  market
         research analysts;

o        biological or medical discoveries;

o        disputes  and/or   developments   concerning   intellectual   property,
         including patents and litigation matters;

o        public concern as to the safety of new technologies;

o        sales of common stock of existing holders;

o        securities class action or other litigation;

o        developments in our relationships  with current or future customers and
         suppliers; and

o        general economic conditions, both in the United States and abroad.

As a result of these factors,  and  potentially  others,  the sales price of our
common  stock has ranged  from  $4.89 to $13.69  per share from  January 1, 2001
through  May 11,  2004 and from  $6.40 to $8.50 per share  from  January 1, 2004
through May 10, 2004.

In  addition,  the stock  market in general has  experienced  extreme  price and
volume  fluctuations that have affected the market price of our common stock, as
well as the stock of many biotechnology companies. Often, price fluctuations are
unrelated to operating  performance  of the  specific  companies  whose stock is
affected.

In the past,  following periods of volatility in the market price of a company's
stock,  securities  class action  litigation  has  occurred  against the issuing
company.  If we were subject to this type of litigation in the future,  we could
incur  substantial  costs and a  diversion  of our  management's  attention  and
resources, each of which could have a material adverse effect on our revenue and
earnings.  Any  adverse  determination  in this type of  litigation  could  also
subject us to significant liabilities.


                                       23



ANTI-TAKEOVER  PROVISIONS IN OUR GOVERNING  DOCUMENTS AND UNDER  APPLICABLE  LAW
COULD IMPAIR THE ABILITY OF A THIRD PARTY TO TAKE OVER OUR COMPANY.

We are subject to various  legal and  contractual  provisions  that may impede a
change in our control, including the following:

o    our  adoption of a  stockholders'  rights  plan,  which could result in the
     significant  dilution  of the  proportionate  ownership  of any person that
     engages in an unsolicited attempt to take over our company; and

o    the ability of our board of  directors  to issue  additional  shares of our
     preferred stock,  which shares may be given superior  voting,  liquidation,
     distribution and other rights as compared to our common stock.

These   provisions,   as  well  as  other   provisions  in  our  certificate  of
incorporation  and bylaws and under the Delaware General  Corporations  Law, may
make it more  difficult  for a third party to acquire our  company,  even if the
acquisition  attempt was at a premium  over the market value of our common stock
at that time.

OUR PRINCIPAL  STOCKHOLDERS  AND MANAGEMENT OWN A SIGNIFICANT  PERCENTAGE OF OUR
CAPITAL  STOCK  AND  WILL BE ABLE TO  EXERCISE  SIGNIFICANT  INFLUENCE  OVER OUR
AFFAIRS.

Our principal  stockholders  and management own a significant  percentage of our
capital  stock  and  will be able to  exercise  significant  influence  over our
affairs.  Our executive  officers,  directors and  principal  stockholders  will
continue to beneficially own 32.1% of our outstanding  common stock,  based upon
the  beneficial  ownership of our common stock as of May 10, 2004.  In addition,
these same persons also hold options to acquire  additional shares of our common
stock, which may increase their percentage ownership of the common stock further
in the future. Accordingly, these stockholders:

o        will be able to significantly influence the composition of our board of
         directors;

o        will   significantly   influence  all  matters  requiring   stockholder
         approval,  including  the  approval  of mergers  and other  significant
         corporate transactions, including change of control transactions; and

o        will continue to have significant influence over our business.

This  concentration  of  ownership  of our common stock could have the effect of
delaying,  preventing  or  deterring  a change  of  control  of us or  otherwise
discouraging a potential  acquirer from attempting to obtain control of us. This
in turn could have a negative effect on the market price of our common stock. It
could also  prevent our  stockholders  from  realizing a premium over the market
prices for their shares of common stock.

ABSENCE OF DIVIDENDS COULD REDUCE OUR ATTRACTIVENESS TO YOU.

Some  investors  favor  companies that pay  dividends,  particularly  in general
downturns in the stock market. We have never declared or paid any cash dividends
on our common  stock.  We  currently  intend to retain any future  earnings  for
funding growth and we do not currently  anticipate  paying cash dividends on our
common stock in the foreseeable  future.  Because we may not pay dividends,  the
return on this investment likely depends on selling this stock at a profit.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE OF MARKET RISK

We conduct business in various foreign  currencies,  including Euros and British
pounds,  and are therefore subject to the transaction  exposures that arise from
foreign  exchange  rate  movements  between  the  dates  that  foreign  currency
transactions  are initiated and the dates that they are  converted.  We are also
subject  to  exchange  rate   exposures   arising  from  the   translation   and
consolidation of the financial results of our foreign  subsidiaries.  Although a
significant  portion of the foreign  currencies in which we conduct our business
is currently,  or is anticipated in the future to be,  denominated in Euros as a
result of the European  Monetary  Union,  we are not certain about the effect of
the Euro on our business,  financial  condition or results of operations.  We do
not currently hedge either our translation  risk or our economic risk associated
with the exchange of foreign currencies into U.S. dollars. There can


                                       24



be no assurances that future changes in currency  exchange rates will not have a
material impact on our future cash collections and operating results.

Our exposure to market risks for changes in interest rates relates  primarily to
outstanding  commercial  debt.  Due to the pay down of our  commercial  debt, we
anticipate  no material  market  risk  exposure  for changes in interest  rates.
Accordingly, we have not included quantitative tabular disclosures.

ITEM 4. CONTROLS AND PROCEDURES

EVALUATION OF CONTROLS AND PROCEDURES

Members of the Company's management, including the Company's President and Chief
Executive  Officer,  Terrance J. Bieker,  and Chief Financial  Officer,  Charles
Best,  evaluated the  effectiveness of the design and operation of the Company's
disclosure  controls and  procedures as of March 31, 2004, the end of the period
covered by this  report.  Based upon that  evaluation,  Mr.  Bieker and Mr. Best
believe  that,  as of March 31,  2004,  the  Company's  disclosure  controls and
procedures  were  effective  in causing  materials  to be  recorded,  processed,
summarized  and reported by our  management on a timely basis and to ensure that
the quality and timeliness of the Company's public disclosures complies with its
Securities and Exchange Commission disclosure obligations.

As of March 31, 2004,  there have been no  significant  changes in the Company's
internal  controls  or in other  factors  that  materially  affect,  or that are
reasonably likely to materially affect, these internal controls.


                                       25



                                     PART II

                                OTHER INFORMATION


ITEM 1.  LEGAL PROCEEDINGS
         None

ITEM 2.  CHANGE IN SECURITIES AND USE OF PROCEEDS
         None

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES
         None.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
         None.

ITEM 5.  OTHER INFORMATION

Effective as of April 1, 2004, the Company entered into an executive  employment
agreement  with Jozef  Vangenechten  to serve as our Executive  Vice President -
Commercial Operations. Prior to the Company's employment of Dr. Vangenechten, he
served as the Managing Director of our Belgium subsidiary through our engagement
of Vita B.V.B.A.,  a consulting  firm in which Dr.  Vangenechten is a beneficial
owner and serves as President  ("VITA").  Pursuant to his employment  agreement,
Dr.  Vangenechten  receives a net annual base salary of approximately  $100,000,
which is payable in a  combination  of both U.S.  Dollars  and Euros,  which the
President may increase at the end of each year of Dr. Vangenechten's employment.
In addition to the base salary to be paid to Dr. Vangenechten,  the Company will
pay various  living  expenses  during the term of his employment in an aggregate
net annual amount equal to $41,800. Dr. Vangenechten is also eligible to receive
an annual bonus under the Company's  management  incentive  plan. The management
incentive  plan will  provide for the  payment of a bonus equal to $62,000  upon
achieving  specified  target  objectives set forth in the  management  incentive
plan, and payments of such lesser or greater amounts upon achieving results less
than or greater than the  specified  target  objectives as shall be contained in
the management incentive plan. The agreement terminates on December 31, 2007. In
the event that Dr. Vangenechten's  employment is terminated without cause during
the term of the  agreement,  the  Company is  obligated  to  continue to pay Dr.
Vangenechten an amount equal to $22,500 and the US$ equivalent of  (euro)119,000
over a period of 9 months following the effective date of such  termination.  In
connection with his employment,  Dr. Vangenechten was also granted stock options
to purchase  50,000  shares of Common Stock of the Company at an exercise  price
equal to the fair  market  value of the  Company's  Common  Stock on the date of
grant,  or $7.00 per  share.  Concurrent  with our  execution  of the  executive
employment  agreement with Dr.  Vangenechten,  the Company's Belgium  subsidiary
executed  a new  management  agreement  with  VITA  pursuant  to which  VITA was
re-engaged  to  manage,  oversee  and  direct the  business  and  affairs of the
Company's  Belgium  subsidiary,  subject to the supervision of the  subsidiary's
Board of Directors.  For its services,  VITA will invoice the Belgium subsidiary
on a monthly  basis but will not be entitled to receive more than  (euro)102,700
in any calendar  year.  The agreement with VITA may be terminated by the Belgium
subsidiary  at any time upon  thirty  days  notice  and  without  penalty to the
Company's  subsidiary.  However,  if the VITA  agreement is  terminated  without
cause, Dr.  Vangenechten's  executive  employment agreement will also terminate,
and he will be entitled to receive  from the  Company  the  termination  payment
described  above.  Notwithstanding  this,  if  the  Company  can  terminate  Dr.
Vangenechten's  executive  employment agreement for cause, or as a result of his
death or permanent  disability,  any  termination of the VITA agreement  without
cause at that time will not entitle him to receive the termination payment.

Pursuant to the  provisions  of a Separation  Agreement  between the Company and
Charles Best, the Company's Chief Financial Officer, dated December 17, 1999, as
of April 29, 2003,  Mr. Best became  entitled to exercise a right of termination
of his employment with the Company and to thereby receive a payment equal to his
current base salary,  payable over a period of one year following such exercise.
Mr. Best's right to exercise that  termination  right was scheduled to terminate
as of the close of business  on April 29,  2004.  In early April 2004,  Mr. Best
indicated his intention to exercise his right of termination and to pursue other
opportunities.  However,  Mr. Best also  indicated his


                                       26



willingness  to  continue  providing  services  to the  Company  for any  period
necessary for the Company's President and Chief Executive Officer, and the Board
of Directors,  to locate a suitable replacement.  In consideration of Mr. Best's
willingness to continue providing services to BioSource, the Company executed an
amendment to Mr. Best's Separation Agreement, which extended the period in which
Mr. Best was able to exercise his right of termination  for an additional  sixty
days.  The amendment also provided that the Company would pay Mr. Best's current
medical  benefits up to a period of six months after he  exercised  his right of
termination. On May 7, 2004, Mr. Best tendered his resignation as Executive Vice
President and Chief Financial  Officer and exercised his right of termination to
be effective as of May 14, 2004.

As a result of the proposed  departure of Mr. Best, the Company  entered into an
executive  employment  agreement  with Alan Edrick,  effective  May 10, 2004, to
serve as its new Executive Vice President and Chief Financial Officer, effective
May 17, 2004.  Prior to joining the Company,  Mr. Edrick most recently served as
Senior Vice President and Chief Financial Officer at North American  Scientific,
Inc., a leading medical device and specialty pharmaceutical company. Pursuant to
his employment agreement, Mr. Edrick receives an annual base salary of $190,000,
which  the  President  may  increase  at the  end of each  year of Mr.  Edrick's
employment.  In  addition  to his  base  salary,  Mr.  Edrick  will  receive  an
additional  $72,000 as a signing  bonus,  which amount will be payable in thirty
equal monthly installments of $2,400 each commencing May 10, 2004, and ending on
the earlier of November 10, 2006 or the date upon which Mr. Edrick's  employment
with the Company  terminates  for any  reason.  Mr.  Edrick is also  eligible to
receive an annual  bonus under the  Company's  management  incentive  plan.  The
management  incentive  plan will  provide  for the  payment of a bonus  equal to
thirty  percent (30%) of Mr.  Edrick's  then-current  base salary upon achieving
specified  target  objectives  set forth in the management  incentive  plan, and
payments of such lesser or greater  amounts upon achieving  results less than or
greater  than the  specified  target  objectives  as shall be  contained  in the
management incentive plan. The agreement terminates on May 9, 2008. In the event
that Mr. Edrick's  employment is terminated without cause by the Company, or for
good reason by Mr. Edrick (as defined in the agreement),  during the term of the
agreement, the Company is obligated to continue to pay Mr. Edrick's then-current
base  salary  for a period  of 9 months  following  the  effective  date of such
termination.  In  connection  with his  employment,  Mr. Edrick was also granted
stock  options to purchase  100,000  shares of Common Stock of the Company at an
exercise  price equal to the fair market value of the Company's  Common Stock on
the date of grant, or $7.99 per share.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

         (a) Exhibits

                  10.1     Executive Employment Agreement between Registrant and
                           Kevin Reagan, dated as of February 15, 2004.

                  31.1     Certificate  of Terrance J. Bieker,  Chief  Executive
                           Officer of BioSource International,  Inc. pursuant to
                           Rule 13a-14(a)  under the Securities and Exchange Act
                           of 1934, as amended.

                  31.2     Certificate  of  Charles  C.  Best,  Chief  Financial
                           Officer of BioSource International,  Inc. pursuant to
                           Rule 13a-14(a)  under the Securities and Exchange Act
                           of 1934, as amended.

                  32.1     Certificate  of  Terrance  J.  Bieker and  Charles C.
                           Best,  Chief  Executive  Officer and Chief  Financial
                           Officer,  respectively,  of BioSource  International,
                           Inc.  pursuant to Rule 13a-14(b) under the Securities
                           and Exchange Act of 1934, as amended.

         (b) Reports on Form 8-K

                  The Company filed a current  report on Form 8-K dated February
                  26, 2004, reporting the issuance of a press release announcing
                  the  Company's  financial  results  for the fiscal  year ended
                  December 31, 2003.


                                       27



                                   SIGNATURES

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




                                        BIOSOURCE INTERNATIONAL, INC.
                                               (Registrant)




Date:  May 13, 2004                     /S/ TERRANCE J. BIEKER
                                        ----------------------------------------
                                           Terrance J. Bieker
                                           President and Chief Executive Officer




Date:  May 13, 2004                     /S/ CHARLES C. BEST
                                        ----------------------------------------
                                           Charles C. Best
                                           Executive Vice President and
                                           Chief Financial Officer


                                       28



                                  EXHIBIT INDEX

EXHIBIT           DESCRIPTION
- -------           -----------

10.1              Executive  Employment  Agreement between  Registrant and Kevin
                  Reagan, dated as of February 15, 2004.

31.1              Certificate of Terrance J. Bieker,  Chief Executive Officer of
                  BioSource International, Inc. pursuant to Rule 13a-14(a) under
                  the Securities and Exchange Act of 1934, as amended.

31.2              Certificate  of Charles C. Best,  Chief  Financial  Officer of
                  BioSource International, Inc. pursuant to Rule 13a-14(a) under
                  the Securities and Exchange Act of 1934, as amended.

32.1              Certificate  of Terrance J. Bieker and Charles C. Best,  Chief
                  Executive Officer and Chief Financial  Officer,  respectively,
                  of BioSource  International,  Inc.  pursuant to Rule 13a-14(b)
                  under the Securities and Exchange Act of 1934, as amended.


                                       29