Document:

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                                                                    EXHIBIT 10.3

                                ESCROW AGREEMENT

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                                                                  EXECUTION COPY

                                ESCROW AGREEMENT

      This Escrow Agreement (this "Escrow Agreement"), dated as of February 22,
2005, is by and among Chemicon Specialty Media, Inc., a Delaware corporation
("Purchaser"), Chemicon International, Inc., a California corporation
("Chemicon"), Serologicals Corporation, a Delaware corporation ("Serologicals",
and together with Chemicon, the "Purchaser Affiliates"), Sentigen Holding Corp.,
a Delaware corporation ("Parent"), Cell & Molecular Technologies, Inc., a
Delaware corporation ("CMT"), and SunTrust Bank, a Georgia banking corporation,
as escrow agent ("Escrow Agent").

                                   WITNESSETH

      WHEREAS, Purchaser, Chemicon, Serologicals, Parent and Seller are parties
to that certain Asset Purchase Agreement, dated as of the date hereof (the
"Asset Purchase Agreement"), pursuant to which Purchaser acquired all of the
assets comprising or used in the operation of the Business, and Purchaser will
assume certain of Seller's liabilities and obligations with respect to operation
of the Business (the "Acquisition");

      WHEREAS, pursuant to Section 7.1 of the Asset Purchase Agreement, Seller
and Parent have agreed, jointly and severally, to indemnify, protect, and hold
harmless the Purchaser Indemnified Parties from and against any Purchaser
Losses; and

      WHEREAS, pursuant to Section 3.2(a)(i) of the Asset Purchase Agreement,
Purchaser has deposited with Escrow Agent $500,000;

      NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereby agree as follows:

      1. DEFINITIONS. Capitalized terms used in this Escrow Agreement and not
otherwise defined herein shall have the meanings assigned to them in the Asset
Purchase Agreement.

      2.   ESTABLISHMENT OF ESCROW.

           2.1. Escrow Agent. Escrow Agent hereby agrees to act as escrow agent
and to receive deposits into the Escrow Fund (as defined below) in accordance
with Section 2.2 and to hold, safeguard and disburse the Escrow Fund pursuant to
the terms and conditions of this Escrow Agreement.

           2.2. Deposit. Simultaneous with the execution of this Escrow
Agreement, Purchaser has delivered to Escrow Agent the amount of FIVE HUNDRED
THOUSAND DOLLARS ($500,000) (such amount, as increased by interest, dividends
and profits retained pursuant to Section 3.3 of this Escrow Agreement and as
reduced by any amounts withdrawn under Section 6.6 of this Escrow Agreement
being the "Escrow Fund").

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      3.   INVESTMENT OF FUNDS.

           3.1. Investments. Except as Purchaser and Seller may from time to
time jointly instruct Escrow Agent in writing and except as provided in Section
3.2 below, the Escrow Fund shall be invested or deposited from time to time, as
instructed by Seller, only in (i) United States Treasury bills, notes, or bonds
with maturities of not more than one year or (ii) a mutual fund the assets of
which are United States government securities or United States corporate bonds
rated Aa or better by Moody's Investor Service or AA or better by Standard and
Poor's, such as the STI Classic U.S. Treasury Securities Money Market Fund.
Escrow Agent shall have no liability for any loss or diminution in the Escrow
Fund resulting from investments made in accordance with the provisions of this
Escrow Agreement.

            3.2. Liquidation of Escrow. Escrow Agent is authorized and directed
to liquidate, in accordance with its customary procedures, any portion of the
Escrow Fund consisting of investments to provide for payments required to be
made under this Escrow Agreement (including, without limitation, Section 6.6).

           3.3. Accumulation of Interest, Dividends and Profits. All interest,
dividends, and profits received by the Escrow Fund (less any expense incurred as
a result of such investments) shall be added to and shall increase the Escrow
Fund.

      4.   PAYMENTS OUT OF THE ESCROW FUNDS.

           4.1. Notice of Claim. Promptly after receipt by a Purchaser
Indemnified Party of a notice by a third party of any complaint or the
commencement of any action or proceeding with respect to which such Purchaser
Indemnified Party may be entitled to receive indemnification pursuant to Section
7.1 of the Asset Purchase Agreement, in addition to any notification that may be
required by the Asset Purchase Agreement, Purchaser shall send to Seller, Parent
and Escrow Agent written notice of such complaint or of the commencement of such
action or proceeding describing the basis therefor and setting forth a
reasonable estimate of the amount of such Purchaser Losses, to the extent that
the amount of such Purchaser Losses is capable of being estimated.

           4.2. Payment of Judgments. Escrow Agent shall pay to the Purchaser
Indemnified Party entitled thereto the amount of the Purchaser Losses in
connection with any claim or complaint described in Section 4.1 of this Escrow
Agreement only (i) in accordance with the joint written instructions of
Purchaser and either Seller or Parent or (ii) within 15 days following
presentation to Escrow Agent (with a copy to Seller or Parent) of a final,
non-appealable order of an arbitrator or a court of competent jurisdiction with
respect to the matter giving rise to the claim for indemnification by the
Purchaser Indemnified Party indicating that such Purchaser Indemnified Party is
entitled to indemnification and the amount to be paid to such Purchaser
Indemnified Party. Any arbitral or court order shall be accompanied by an
opinion of counsel to the Purchaser Indemnified Party, reasonably satisfactory
to Escrow Agent, to the effect that such order is final and non-appealable.
Escrow Agent may rely conclusively

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upon such arbitral or court order and legal opinion with respect to any such
payment without further inquiry as to any requirement set forth in this Section
4.2.

            4.3. Non-Litigation Claims. In the event a Purchaser Indemnified
Party seeks indemnification pursuant to Section 7.1 of the Asset Purchase
Agreement, but other than pursuant to Section 4.2 of this Escrow Agreement,
Purchaser shall send written notice of such claim (a "Claim Notice") to Escrow
Agent, Parent and Seller, setting forth the amount and the basis of such claim
(the "Expected Claim Amount"). Escrow Agent shall disburse, from the Escrow
Fund, to such Purchaser Indemnified Party the Expected Claim Amount stated in
such Claim Notice on the thirty-first (31st) calendar day after it receives such
Claim Notice; provided, however, that no such disbursement shall be made if
Escrow Agent receives prior to the close of business on the thirtieth (30th)
calendar day after Escrow Agent receives the Claim Notice a certificate (an
"Objection Certificate") from either Seller or Parent objecting to the
indemnification claim and instructing Escrow Agent not to pay such Expected
Claim Amount to such Purchaser Indemnified Party. If Escrow Agent receives an
Objection Certificate on or prior to such thirtieth (30th) day, Escrow Agent
shall hold the Expected Claim Amount until receipt of joint written instructions
from Purchaser and either Seller or Parent or a final non-appealable order or
opinion of an arbitrator or court of competent jurisdiction resolving such
claim. Promptly upon receipt of (i) joint written instructions of Purchaser and
Seller or Parent or (ii) a final non-appealable order or opinion of an
arbitrator or a court of competent jurisdiction resolving such claim and
indicating that the Purchaser Indemnified Party is entitled to indemnification
and the amount thereof, Escrow Agent shall disburse, from the Escrow Fund, to
such Purchaser Indemnified Party the amount stated in such instructions, order
or opinion. Any such order or opinion shall be accompanied by an opinion of
counsel to the Purchaser Indemnified Party stating that such order or opinion is
final and non-appealable. Escrow Agent may rely conclusively upon such arbitral
or court order and legal opinion with respect to any such payment without
further inquiry as to any requirement set forth in this Section 4.3.

            4.4 Working Capital Adjustment. Escrow Agent shall promptly pay to
Purchaser, upon written request from Purchaser, the amount of any payment
required to be made by Seller pursuant to Section 3.2(b) of the Asset Purchase
Agreement, provided that Seller and Parent acknowledge and agree that Purchaser
is not required to seek payment of such amounts from the Escrow Fund.

      5.    DISTRIBUTION AND TERMINATION OF ESCROW.

            5.1    Disbursements.

                   5.1.1. Six-Month Anniversary. On the six-month anniversary of
      the date hereof, Escrow Agent shall pay and distribute to Parent from the
      Escrow Fund an amount equal to $250,000 less (i) the aggregate amount of
      all claims then made by any Purchaser Indemnified Party pursuant to
      Section 4 of this Escrow Agreement and paid to the Purchaser Indemnified
      Party entitled thereto, (ii) the aggregate amount of all claims then made
      by any Purchaser Indemnified Party pursuant to Section 4 of this Escrow
      Agreement and not then otherwise paid pursuant to this Escrow Agreement,
      if any, and

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      (iii) the fees and expenses of Escrow Agent incurred and payable pursuant
      to Section 6.6 of this Escrow Agreement, if any.

                  5.1.2. One-Year Anniversary. On the one-year anniversary of
      the date hereof, Escrow Agent shall pay and distribute to Parent all
      amounts remaining in the Escrow Fund less (i) the aggregate amount of all
      claims then made by any Purchaser Indemnified Party pursuant to Section 4
      of this Escrow Agreement and not then otherwise paid pursuant to this
      Escrow Agreement, if any, and (ii) the fees and expenses of Escrow Agent
      incurred and payable pursuant to Section 6.6 of this Escrow Agreement, if
      any.

            5.2. Retention of Claim Reserves. Escrow Agent shall retain the
aggregate amount of all claims not otherwise paid pursuant to this Escrow
Agreement pursuant to Section 5.1.1(ii) and Section 5.1.2(ii) for distribution
in accordance with Section 4 of this Escrow Agreement.

            5.3 Written Instructions. Notwithstanding the foregoing, this Escrow
Agreement shall terminate upon the joint final written instructions received by
Escrow Agent from Purchaser, Seller and Parent terminating this Escrow Agreement
and directing disposition of the Escrow Fund.

      6.    DUTIES OF ESCROW AGENT.

            6.1. Duties of Escrow Agent. Escrow Agent shall have only such
duties and responsibilities as are expressly set forth herein and no additional
or other duties or responsibilities shall be implied. Escrow Agent shall not be
required to take notice of the Asset Purchase Agreement and shall have no duty
or responsibility to take any action pursuant to the terms thereof.

            6.2. Liability of Escrow Agent. Escrow Agent shall not be liable,
except for its own gross negligence or willful misconduct. Except with respect
to claims based upon such gross negligence or willful misconduct that are
successfully asserted against Escrow Agent, Purchaser, Purchaser Affiliates,
Seller and Parent shall, jointly and severally, indemnify and hold harmless
Escrow Agent and its officers, directors, agents and employees (and any
successor Escrow Agent) from and against any and all losses, liabilities,
claims, actions, damages and expenses, including reasonable attorneys' fees and
disbursements, arising directly or indirectly out of or in connection with this
Escrow Agreement. Without limiting the foregoing, Escrow Agent shall in no event
be liable in connection with its investment or reinvestment of any cash held by
it hereunder in good faith, in accordance with the terms hereof, including,
without limitation, any liability for any delays (not resulting from its gross
negligence or willful misconduct) in the investment or reinvestment of the
Escrow Fund, or any loss of interest incident to any such delays. Escrow Agent
shall in no event incur any liability with respect to (i) any action taken or
omitted to be taken in good faith upon advice of Escrow Agent's legal counsel
given with respect to any question relating to the duties and responsibilities
of Escrow Agent hereunder or (ii) any action taken or omitted to be taken in
reliance on any instrument

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delivered to Escrow Agent in accordance with this Escrow Agreement and believed
by Escrow Agent to be genuine and to have been signed or presented by the proper
party or parties. The rights afforded under this Section 6.2 and the provisions
of Section 6.6 shall survive the termination of this Escrow Agreement and any
resignation or removal of Escrow Agent.

            6.3 No Direct Interest. Escrow Agent does not have any interest in
the Escrow Fund deposited hereunder but is serving as escrow holder only and
having only possession thereof. Notwithstanding anything to the contrary herein
provided, except with respect to Federal withholding taxes, the Escrow Agent
shall have no duty to prepare or file any Federal or state tax report or return
with respect to the Escrow Fund or any income earned thereon. Seller will
provide Escrow Agent with appropriate Internal Revenue Service Forms W-9 for tax
identification number certification, or non-resident alien certifications.
Sections 6.2 and 6.3 shall survive any termination of this Escrow Agreement or
the resignation of Escrow Agent.

            6.4. No Investment Advice. Escrow Agent shall not be called upon to
advise any party as to the wisdom of selling or retaining or taking or
refraining from any action with respect to any securities or other property
deposited hereunder.

            6.5. Resignation. Escrow Agent (and any successor Escrow Agent) may,
at any time, resign (i) by giving written notice to Purchaser, Parent and Seller
(a "Resignation Notice") or (ii) by delivering the Escrow Fund to any successor
Escrow Agent jointly designated, in writing, by Purchaser, Parent and Seller, or
to any court of competent jurisdiction, whereupon Escrow Agent shall be
discharged of and from any and all further obligations arising in connection
with this Escrow Agreement. The resignation of Escrow Agent will take effect on
the earlier of (i) the appointment of a successor escrow agent (including a
court of competent jurisdiction) or (ii) the day which is 30 days after delivery
of the Resignation Notice. If at that time Escrow Agent has not received a
designation of a successor escrow agent, Escrow Agent's sole responsibility
after that time shall be to retain and safeguard the Escrow Fund until receipt
of a designation of a successor escrow agent or a joint written disposition
instruction by Purchaser, Parent and Seller or a final non-appealable order of a
court of competent jurisdiction. Notwithstanding anything to the contrary herein
provided, in the event Escrow Agent resigns as Escrow Agent hereunder and no
successor Escrow Agent has been designated and accepted appointment as successor
Escrow Agent within sixty (60) days following the date of the Escrow Agent's
notice of resignation, Escrow Agent shall have the right to deposit all property
held pursuant to this Escrow Agreement into the registry of any court of
competent jurisdiction and notify the parties hereto of such deposit, and
thereupon Escrow Agent shall be discharged from all further duties and
responsibilities as Escrow Agent under this Escrow Agreement.

            6.6. Escrow Agent's Compensation. Concurrent with the execution and
delivery of this Escrow Agreement, Purchaser has paid the compensation as set
forth on Exhibit A attached hereto (as payment in full) for the services to be
rendered by Escrow Agent hereunder. The parties hereto hereby agree that each of
Purchaser, Parent and Seller shall jointly and severally be liable for the
amount of any additional compensation owed to Escrow Agent for any necessary
extraordinary services and for any amount owed to Escrow Agent to reimburse it

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for costs and expenses related thereto, as contemplated by Exhibit A (which
amounts Escrow Agent shall be entitled to withdraw and pay from the Escrow
Fund).

            6.7. Use of Escrow Agent's Name. No printed or other matter in any
language (including, without limitation, prospectuses, notices, reports and
promotional material) that mentions Escrow Agent's name or the rights, powers,
or duties of Escrow Agent shall be issued by the other parties hereto or on such
parties' behalf unless Escrow Agent shall first have given its specific written
consent thereto.

            6.8. Payment or Transfer of Monies. Nothing contained herein shall
be deemed to obligate Escrow Agent to pay or transfer any monies hereunder
unless and until such funds are received and collected by Escrow Agent.

            6.9 Disputes. As additional consideration and as an inducement for
Escrow Agent to act hereunder, the parties hereto agree and acknowledge that in
the event of any disagreement between Purchaser, Parent and Seller, or any other
person, resulting in adverse claims and demands being made with respect to the
Escrow Fund, Escrow Agent shall be entitled, at its option, to refuse to comply
with the demands of such parties, or any of such parties, so long as such
disagreement shall continue. In such event, Escrow Agent shall make no delivery
or other disposition of the Escrow Fund or any part of the Escrow Fund.
Notwithstanding anything in this Escrow Agreement to the contrary, Escrow Agent
shall not be or become liable to such parties or any of them for the failure of
Escrow Agent to comply with the conflicting or adverse demands of such parties
or any of such parties. Escrow Agent shall be entitled to continue to refrain
and refuse to deliver or otherwise dispose of the Escrow Fund or any part
thereof or to otherwise act hereunder unless and until (i) Purchaser, Parent and
Seller have delivered joint written instructions to Escrow Agent with respect to
any such disagreement pursuant to Sections 4.2, 4.3, 4.4 or 5 of this Escrow
Agreement or (ii) Escrow Agent shall have received a final non-appealable order
of a court or arbitrator together with an opinion of counsel with respect to any
such disagreement as required by Section 4.2 or 4.3 of this Escrow Agreement. In
the event of a disagreement described in this Section 6.9, Escrow Agent shall
have the right, in addition to the rights described above and at the option of
Escrow Agent, to tender into the registry or custody of any court of competent
jurisdiction, all money and property comprising the Escrow Fund and may take
such other legal action as may be appropriate or necessary in the opinion of
Escrow Agent. Upon payment to such court, the parties hereto agree that Escrow
Agent shall be discharged from all further duties hereunder; provided, however,
that such payment or filing of such legal proceedings shall not require Escrow
Agent to reimburse the Escrow Fund (or Purchaser, Parent or Seller if such
compensation is not paid out of the Escrow Fund) for any fees earned hereunder
by Escrow Agent prior to such filing and the discharge of Escrow Agent of its
duties hereunder.

      7. TAX OWNERSHIP. Purchaser, Parent and Seller agree that, for purposes of
federal and state income Taxes only, Seller shall be treated as the owner of the
Escrow Fund and shall report all income, if any, that is earned on, or derived
from, the Escrow Fund as income in the taxable year or years in which such
income is properly includible and pay any income taxes attributable thereto.

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      8.     MISCELLANEOUS.

            8.1 Entire Agreement. This Escrow Agreement constitutes the sole
understanding of the parties with respect to the subject matter hereof. No
amendment, modification or alteration of the terms or provisions of this Escrow
Agreement shall be binding unless the same shall be in writing and duly executed
by the parties hereto.

            8.2 Parties Bound by Agreement; Successors and Assigns. The terms,
conditions and obligations of this Escrow Agreement shall inure to the benefit
of and be binding upon the parties hereto and their respective successors,
heirs, assigns and personal representatives. Without the prior written consent
of the other parties hereto, except as provided in Section 6.5, no party may
assign its rights, duties or obligations hereunder or any part thereof to any
other person or entity.

            8.3 Counterparts. This Escrow Agreement may be executed in one or
more counterparts, each of which shall for all purposes be deemed to be an
original and all of which shall constitute the same instrument.

            8.4 Headings. The headings of the sections and paragraphs of this
Escrow Agreement are inserted for convenience only and shall not be deemed to
constitute part of this Escrow Agreement or to affect the construction hereof.

            8.5 Modification and Waiver. Any of the terms or conditions of this
Escrow Agreement may be waived in writing at any time by the party that is
entitled to the benefits thereof. No waiver of any of the provisions of this
Escrow Agreement shall be deemed to or shall constitute a waiver of any other
provision hereof (whether or not similar).

            8.6 Notices. All notices, communications and deliveries hereunder
shall be made in writing signed by or on behalf of the party making the same,
shall specify the Section hereunder pursuant to which it is given or being made,
and shall be delivered personally or by a reputable courier service (with
evidence of delivery and postage and other fees prepaid) to the addresses and
representatives set forth on Exhibit B attached hereto or to such other
representative or at such other address of a party as such party may furnish to
the other parties in writing. Any such notice, communication or delivery shall
be deemed given or made (a) on the date of delivery, if delivered in person or
(b) on the first Business Day after delivery to a customer service
representative if sent by reputable courier service; provided, however, that
Escrow Agent shall be deemed to have received notice only upon actual receipt
thereof.

            8.7 Governing Law; Construction; Consent to Jurisdiction. This
Escrow Agreement shall be construed in accordance with and governed by the laws
of the State of Georgia without giving effect to the principles of conflicts of
law thereof. No provision of this Escrow Agreement or any related document shall
be construed against or interpreted to the disadvantage of any party hereto by
any court or other governmental or judicial authority by reason of such party's
having or being deemed to have structured or drafted such provision. The parties
hereto consent to jurisdiction and venue in the federal and state courts for
Fulton County, Georgia.

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            8.8 No Third-Party Beneficiaries. With the exception of the parties
to this Escrow Agreement, Seller and Parent and their respective permitted
successors and assigns, there shall exist no right of any person to claim a
beneficial interest in this Escrow Agreement or any rights occurring by virtue
of this Escrow Agreement.

            8.9 References. Whenever reference is made in this Escrow Agreement
to any section, such reference shall be deemed to apply to the specified section
of this Escrow Agreement.

            8.10 Severability. In the event that any provision hereof would,
under applicable law, be invalid or unenforceable in any respect, such provision
shall be construed by modifying or limiting it so as to be valid and enforceable
to the maximum extent compatible with, and permissible under, applicable law.
The invalidity or unenforceability of any provision of this Escrow Agreement
shall not affect the validity or enforceability of any other provision of this
Escrow Agreement which shall remain in full force and effect.

            8.11 Representations and Warranties. Each of Purchaser, Parent and
Seller represent and warrant to Escrow Agent, and Escrow Agent represents and
warrants to each of Purchaser, Parent and Seller that (i) such party is duly
authorized to enter into this Escrow Agreement and the transactions contemplated
hereunder; (ii) this Escrow Agreement is a valid and binding obligation of such
party; and (iii) the officer or officers signing this Escrow Agreement on behalf
of such party is duly authorized to do so.

              THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK.
                             SIGNATURE PAGE FOLLOWS.

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            IN WITNESS WHEREOF, each of the undersigned have executed and
delivered this Escrow Agreement as of the date first stated above.

                           CHEMICON SPECIALTY MEDIA, INC.

                           /s/ Harold W. Ingalls
                               ----------------------
                           Title: Vice President, Finance, and Chief Financial
                                  Officer
                           TIN#:

                           CHEMICON INTERNATIONAL, INC.

                           /s/ Harold W. Ingalls
                               ----------------------
                           Title: Vice President, Finance, and Chief Financial
                                  Officer
                           TIN#:

                           SEROLOGICALS CORPORATION

                           /s/ Harold W. Ingalls
                               ----------------------
                           Title: Vice President, Finance, and Chief Financial
                                  Officer
                           TIN#:

                           SENTIGEN HOLDING CORP.

                           /s/ Fredrick B. Rolff
                               ----------------------
                           Title: Chief Financial Officer
                           TIN#:

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                           CELL & MOLECULAR TECHNOLOGIES, INC.

                           /s/ Fredrick B. Rolff
                               ------------------------------
                           Title:   Chief Financial Officer

                           /s/ SUNTRUST BANK, AS ESCROW AGENT
                               ------------------------------

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                                    EXHIBIT A

                                  FEE SCHEDULE

The annual administration fee of $2,500.00 for administering this Escrow
Agreement is payable in advance at the time of closing and if applicable, will
be invoiced each year to the appropriate party(ies) on the anniversary date of
the closing of the Escrow Agreement. Also, a one-time legal review fee of
$500.00 is payable in advance at the time of closing.

Out of pocket expenses such as, but not limited to postage, courier, overnight
mail, insurance, money wire transfer, long distance telephone charges,
facsimile, stationery, travel, legal or accounting, etc., will be billed at
cost.

These fees do not include extraordinary services which will be priced according
to time and scope of duties. The fees shall be deemed earned in full upon
receipt by the Escrow Agent, and no portion shall be refundable for any reason,
including without limitation, termination of the Escrow Agreement.

It is acknowledged that the schedule of fees shown above are acceptable for the
services mutually agreed upon.

Note: This fee schedule is based on the assumption that the escrowed funds will
be invested in SunTrust's cash sweep account, STI Classic Fund.

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                                    EXHIBIT B

                                NOTICE ADDRESSES

      To Purchaser
      and Purchaser Affiliates:
                                 Chemicon Specialty Media, Inc.
                                 5655 Spalding Drive
                                 Norcross, Georgia 30092
                                 Attn: Philip Theodore
                                 Telecopy No.: (678) 728-2020
                                 Telephone No.: (678) 728-2015

      with a copy to:            King & Spalding LLP
                                 191 Peachtree Street
                                 Atlanta, Georgia  30303-1763
                                 Attn:  G. Roth Kehoe II
                                 Telecopy No.: (404) 572-5136
                                 Telephone No.: (404) 572-2751

      To Parent:                 Sentigen Holding Corp.
                                 Audubon Biomedical Center
                                 3960 Broadway
                                 New York, New York 10032
                                 Attn: Erik Lundh
                                 Telecopy No.: (212) 568-2847
                                 Telephone No.: (212) 740-0011

      with a copy to:            Fulbright & Jaworski LLP
                                 666 Fifth Avenue
                                 New York, New York  10103
                                 Attn: Merrill M. Kraines
                                 Telecopy No.: (212) 318-3400
                                 Telephone No.: (212) 318-3261

<PAGE>

      To CMT:                    Cell & Molecular Technologies, Inc.
                                 Audubon Biomedical Center
                                 3960 Broadway
                                 New York, New York 10032
                                 Attn: Erik Lundh
                                 Telecopy No.: (212) 568-2847
                                 Telephone No.: (212) 740-0011

      To Escrow Agent:           SunTrust Bank
                                 25 Park Place, 24th Floor
                                 Atlanta, Georgia 30303-2900
                                 Attn: Corporate Trust Department
                                 Telecopy No.: (404) 588-7335
                                 Telephone No.: (404) 588-7262<PAGE>

                                                                    EXHIBIT 10.4
                                                                  EXECUTION COPY

                          TRANSITION SERVICES AGREEMENT

      THIS TRANSITION SERVICES AGREEMENT, is dated as of, and effective as of,
February 22, 2005 (this "Agreement"), and is by and between SENTIGEN HOLDING
CORPORATION, a Delaware corporation ("Sentigen"), and CELL & MOLECULAR
TECHNOLOGIES, INC., a Delaware corporation ("CMT", and together with Sentigen,
collectively, the "Sellers"), and CHEMICON SPECIALTY MEDIA, INC., a Delaware
corporation ("CSM"), CHEMICON INTERNATIONAL, INC., a California corporation
("Chemicon"), and SEROLOGICALS CORPORATION, a Delaware corporation
("Serologicals", and together with CSM and Chemicon, collectively, the "Buyers")
(collectively, the "Parties").

                                    RECITALS

      WHEREAS, pursuant to an Asset Purchase Agreement, dated the date hereof
(the "Purchase Agreement"), by and among Sellers and Buyers, CSM has purchased
from CMT and CMT has sold to CSM, all of the assets comprising or used in the
operations of the Specialty Media Division (the "Division") of CMT; and

      WHEREAS, in order to provide for an efficient and orderly transition of
the ownership and management of the business of the Division, Sellers have
agreed to enter this Agreement to provide certain transition services after the
Closing to Buyers on the terms and conditions set forth herein;

      NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein expressed and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Parties hereto agree as
follows:

                                    ARTICLE I

                                  CONSTRUCTION

      Section 1.1. Definitions and Interpretation. Capitalized terms used but
not otherwise defined in this Agreement shall have the meanings ascribed to such
terms in the Purchase Agreement. All references to Articles and Sections shall
be deemed to be references to Articles and Sections of this Agreement unless the
context shall otherwise require. The headings of the Articles and Sections are
included for convenience of reference only and are not intended to be part of or
to affect the meaning or interpretation of this Agreement. Any reference in this
Agreement to a "day" or a number of "days" (without the explicit qualification
of "business") shall be interpreted as a reference to a calendar day or number
of calendar days. The definitions

<PAGE>

of terms defined herein shall apply equally to both singular and plural forms of
the defined terms.

                                   ARTICLE II

                               TRANSITION SERVICES

      Section 2.1 In General. During the period beginning on the Closing Date
and ending at the close of business on June 30, 2005, subject to such extensions
as may be mutually agreed to by the parties in writing and subject to the right
of the Buyers to terminate the obligation of the Sellers hereunder as provided
below (the "Transition Period"), the Sellers agree to furnish, or to cause their
respective affiliates to furnish, to the Buyers the services specified in the
following subsections of this Article II and such other services as the Parties
shall mutually agree are necessary to effect an orderly transition of the
ownership of the business of the Division from the Sellers to Buyers (referred
to herein collectively as the "Transition Services"). During the Transition
Period, the Sellers agree to furnish, or to cause their respective affiliates to
furnish, the services of such persons whose services shall be reasonably
necessary to provide the Transition Services (the "Transition Employees"). The
Transition Employees shall be available to provide Transition Services for
Buyers but shall not be required to devote their full time and attention to the
Transition Services. The work schedule of the Transition Employees shall be as
mutually agreed upon by the parties. The Buyers shall be permitted, upon the
provision of not less than 30 days' notice to the Sellers, to instruct the
Sellers to cease providing some or all of the Transition Services.

      Section 2.2. Management Information and Telecommunications Services.
During the Transition Period, the Sellers (i) shall permit the Division's
information technology equipment to remain connected to the Sellers' internal
computer network and shall provide network helpdesk and support sufficient to
ensure the operation of such equipment and such network on the same basis as the
Sellers' equipment and network operate; (ii) shall provide the Division with
access to Microsoft Outlook, Microsoft Word, Microsoft Excel and Microsoft
PowerPoint to the extent permitted by the Sellers' licenses with Microsoft
Corporation; (iii) shall provide the Division and the Buyers with access to the
Sellers' MAS 200 accounting software to the extent permitted by the Sellers'
licenses with Best Software, Inc.; (iv) shall permit the Division's
telecommunications equipment to remain connected to the Sellers' telephone
switch; and (v) shall provide local and long distance telephone service and
internet access to the Division to the extent permitted by the terms of the
Sellers' existing agreements with its service providers. If the provision of any
management information or telecommunications service to be provided by the
Sellers would infringe or violate a license, royalty agreement, or other
agreement or arrangement to which either Seller is a party, then the Sellers
shall provide Buyers with notice of said potential infringement or violation (a
"MIS Violation Notice"). Within ten days following receipt of a MIS Violation
Notice, the Sellers shall cease providing the management information service
that was subject to the MIS Violation Notice.

                                       2
<PAGE>

      Section 2.3. Accounting. During the Transition Period, the Sellers shall,
or shall cause their respective affiliates to, provide the following accounting
services to the Buyers with respect to the Division: (i) generating invoices to
customers; (ii) mailing invoices; (iii) receiving cash payments and remitting
such cash payments in accordance with Buyers' instructions; (iv) overseeing
accounts payable administration; (v) issuing to vendors checks drawn off Buyers'
accounts; (vi) recording the acquisition or disposition of fixed assets; and
(vii) assisting with the transfer of all accounting data recorded by the Sellers
to the Buyers' financial system. With respect to the accounting Transition
Services described in clause (vii) of the preceding sentence, the Sellers shall
provide batch posting reports with respect to all accounting data recorded by
the Sellers in Microsoft Excel format. The accounting Transition Services
provided pursuant to this Section 2.3 will be supervised by the Sellers' senior
accounting management. The accounting Transition Services shall not include the
following: (i) general ledger creation or maintenance; (ii) financial statement
preparation; (iii) credit analysis; or (iv) tax reporting, preparation,
compliance or planning.

      Section 2.4. Document Management. During the Transition Period, the
Sellers agree to assist the Buyers to identify and to retrieve any of the
Division's historical business records that have been co-mingled with the
Sellers' historical business records.

                                   ARTICLE III

                         PAYMENT FOR TRANSITION SERVICES

      Section 3.1. Pricing. The Buyers shall pay to Sellers for the Transition
Services a fee for the Transition Services in accordance with the following
schedule:

<TABLE>
<CAPTION>
SERVICE                                               FEE
------------------------                ---------------------------------
<S>                                     <C>
MIS and Telecom Services                $1,500  per week
Accounting                              $2,600  per week
Document Management                     $20.00  per hour of employee time
</TABLE>

In addition to the fees set forth above, the Buyers shall reimburse the Sellers
for their out-of-pocket costs incurred in providing the Transition Services to
Buyers. Such out-of-pocket costs shall be billed at the actual amount incurred
without premium or mark-up.

      Section 3.2. Invoices. The Sellers shall prepare and submit to the Buyers
monthly invoices for the Transition Services during each month of the Transition
Period. Such invoices shall be submitted within 15 days following the end of
each month during the Transition Period. Each such invoice shall set forth in
reasonable detail a description of the Transition Services provided during the
month covered by the invoice and a description of the manner in which the amount
invoiced was calculated.

      Section 3.3. Payment of Invoices. The Buyers shall pay invoices submitted
by the Sellers promptly following receipt thereof and in any event within 45
days following receipt.

                                       3
<PAGE>

Any undisputed amount not paid within 45 days shall bear interest at .25% per
month, or the maximum rate permitted by applicable law, whichever is less. If
the Buyers dispute the amount of any invoice, they shall pay the undisputed
amount and shall provide a notice to the Sellers describing in reasonable detail
the basis for their dispute of the remainder. The Parties shall work together in
good faith to resolve any such dispute. If the Buyers so request, the Sellers
shall permit the Buyers to examine, at their expense and during normal business
hours, the business records relevant to the computation of the disputed invoiced
amount. If the Buyers and the Sellers are unable to resolve any such dispute,
the dispute shall be submitted to arbitration in accordance with Section 8.14 of
the Purchase Agreement.

                                   ARTICLE IV

                                OTHER AGREEMENTS

      Section 4.1. Cash Receipts. As promptly as practicable following the
Closing Date, the Sellers shall notify the customers of the Division that the
Division has been sold to the Buyers, which notification shall include
instructions for the remission of payments to the Buyers with respect to any
accounts receivable of the Division purchased by the Buyers. From time to time,
both during the Transition Period and thereafter, the Sellers may receive
payments from third parties that belong to the Buyers. The Sellers agree to use
their best efforts to identify any such payments, to notify the Buyers of
receipt of such payments and to remit such payments to the Buyers, in each case,
as promptly as practicable. Notwithstanding anything to the contrary set forth
in this Agreement, this Section 4.1 shall survive the expiration of the
Transition Period indefinitely.

      Section 4.2. Mail, Faxes and Telephone Calls. During and after the
Transition Period, the Sellers will forward all mail, faxes and telephone calls
relating to or involving the Division to the Buyers to such telephone and
facsimile number(s) and/or addresses as Buyers shall specify from time-to-time.
Notwithstanding anything to the contrary set forth in this Agreement, this
Section 4.2 shall survive the expiration of the Transition Period.

                                    ARTICLE V

                              TERM AND PERFORMANCE

      Section 5.1. Term. Unless otherwise specified, the Sellers' obligation to
perform the Transition Services covered by this Agreement shall terminate at the
close of business on the last day of the Transition Period or upon the written
agreement of the Parties.

      Section 5.2. Performance of Transition Services. The Sellers agree to
perform the Transition Services in accordance with past practices.

                                       4
<PAGE>

                                   ARTICLE VI

                                  MISCELLANEOUS

      Section 6.1. Indemnification; Limitation of Liability. Each Party (the
"Indemnifying Party") shall protect, indemnify and hold harmless each other
Party for any and all losses and damages arising from (i) any material breach of
or material default in performance by the Indemnifying Party of any covenant,
agreement or obligation to be performed by such Indemnifying Party pursuant to
this Agreement; (ii) any act of fraud, embezzlement or criminal activity of the
Indemnifying Party (or any of its officers, directors, employees or agents); or
(iii) the willful misconduct or gross negligence by the Indemnifying Party in
the performance of its covenants, agreements or obligations under and pursuant
to this Agreement; provided that in no event shall any Indemnifying Party be
liable for any indirect, special, incidental, punitive or consequential damages
pursuant to this Section 6.1.

      Section 6.2. Binding Effect; Assignment. This Agreement shall be binding
upon, and inure to the benefit of, the parties and their respective successors,
legal representatives and permitted assigns. No assignment of this Agreement or
of any rights or obligations hereunder may be made by either party without the
prior written consent of the other party. Any attempted assignment without the
required consent shall be null and void.

      Section 6.3. Relationship of the Parties. None of the provisions of this
Agreement are intended to create nor shall they be deemed or construed by the
parties to create any partnership or joint venture relationship or other
relationship between the parties hereto, except that of independent entities
contracting with each other solely for the purpose of effecting the provisions
of this Agreement.

      Section 6.4. Further Assurances. From and after the date hereof, each
party hereto will execute all such instruments and take all such actions as any
other party may reasonably request in connection with the transactions and
services contemplated by this Agreement. In addition, the parties hereto shall
cooperate with each other and shall cause their officers, employees, agents,
auditors and representatives to cooperate with each other during the Transition
Period to facilitate the orderly transition of the business of the Division.

      Section 6.5. Notices. All notices, requests, demands and other
communications required or permitted to be given or delivered hereunder shall be
given in accordance with the notice provisions in Section 8.1 of the Purchase
Agreement.

      Section 6.6. No Third Party Beneficiaries. The Parties hereto agree that
this Agreement is for the sole benefit of the Parties hereto and is not intended
to confer any rights or benefits on any third party, including any employee of
either Party hereto, and that there are no third party beneficiaries to this
Agreement or to any part of a specific provision of this Agreement.

                                       5
<PAGE>

      Section 6.7. Governing Law. This Agreement shall be governed, construed
and enforced in accordance with the laws of the State of New York, without
regard to choice of law principles thereof.

      Section 6.8. Amendment. This Agreement may be amended, supplemented or
modified only by a written agreement signed by each party hereto. Any of the
terms or conditions of this Agreement may be waived at any time by the party
entitled to the benefit thereof but only by a written instrument signed by the
party waiving such terms or conditions. The waiver of any provision shall be
effective only in the specific instance and for the particular purpose for which
it was given. No failure to exercise, and no delay in exercising, any right or
power hereunder shall operate as a waiver thereof.

      Section 6.9. Severability. Whenever possible, each provision of this
Agreement shall be interpreted in such a manner as to be effective and valid
under applicable law. But if any provision of this Agreement is held to be
prohibited by or invalid under applicable law, such provision shall be deemed
restated to reflect the original intention of the parties as nearly as possible
in accordance with applicable law, and if capable of substantial performance,
the remaining provisions of this Agreement shall be enforced as if this
Agreement was entered into without the invalid provision.

      Section 6.10. Counterparts. This Agreement may be executed in
counterparts, each of which shall be an original, but all of which shall
constitute one and the same agreement.

      Section 6.11. Force Majeure. If either Party to this Agreement shall be
prevented, hindered or delayed in the performance or observance of any of its
obligations hereunder by reason of any circumstances beyond its reasonable
control, and such delay could not have been prevented by reasonable precautions
and cannot reasonably be circumvented by the Party through the use of alternate
sources, work-around plans, or other means (a "Force Majeure"), then such Party
shall be excused from any other further performance or observance of the
obligations so affected for so long as such circumstances prevail and such Party
continues to use its best efforts to recommence performance or observance
whenever and to whatever extent possible without delay. Any Party so delayed in
its performance shall immediately notify the other and shall describe at a
reasonable level of detail the circumstances causing such delay. Notwithstanding
the foregoing, should a Party be unable to perform any of its obligations
hereunder for a period of more than 30 consecutive days by reason of a Force
Majeure, the other Party, at its option, shall have the right to terminate this
Agreement in whole or solely with respect to the section hereof under which the
non-performing Party has been unable to perform its obligations, in which case
the provision so terminated shall have no further force or effect and this
Agreement shall remain in effect as to all other provisions.

      Section 6.12. Confidential Information. The Parties acknowledge that the
provision of the Transition Services will require that the Parties exchange
"Confidential Information" within the meaning of the Joint Confidentiality
Agreement dated June 15, 2004, between Sentigen Holding Corporation and
Serologicals Corporation. The Parties hereby agree to abide by the

                                       6
<PAGE>

terms of such Joint Confidentiality Agreement with respect to any such
information exchanged by them during the term of this Agreement.

        (The remainder of this page has been left blank intentionally.)

                                       7
<PAGE>

      IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
duly executed as of the date set forth above.

SENTIGEN HOLDING CORPORATION

/s/ Fredrick B. Rolff
Title: Chief Financial Officer

CELL & MOLECULAR TECHNOLOGIES, INC.

/s/ Fredrick B. Rolff
Title: Chief Financial Officer

CHEMICON SPECIALTY MEDIA, INC.

/s/ Harold W. Ingalls
Title: Vice President, Finance, and Chief Financial Officer

CHEMICON INTERNATIONAL, INC.

/s/ Harold W. Ingalls
Title: Vice President, Finance, and Chief Financial Officer

SEROLOGICALS CORPORATION

/s/ Harold W. Ingalls
Title: Vice President, Finance, and Chief Financial Officer

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