Document:

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                                                                    EXHIBIT 10.1

                             STOCK OPTION AGREEMENT

         AGREEMENT, made as of September 12, 2005, by and between SENTIGEN
HOLDING CORP., a Delaware corporation (the "Company") with its principal office
located at 445 Marshall Street, Phillipsburg, New Jersey 08865, and Joseph K.
Pagano (the "Optionee").

                              W I T N E S S E T H:

         WHEREAS, pursuant to the Company's 2000 Performance Equity Plan, as
amended ("Plan"), the Company desires to grant to the Director an option to
purchase shares of common stock of the Company, $.01 par value (the "Common
Stock") (capitalized terms used herein and not otherwise defined shall have the
meanings set forth in the Plan); and

         WHEREAS, the Optionee desires to acquire the option on the terms and
conditions set forth in this Agreement and subject to the provisions of the
Plan.

         NOW, THEREFORE, IT IS AGREED:

1. Grant. The Company hereby grants to the Optionee an option (the "Option") to
purchase all or any part of an aggregate of 66,000 shares of the Common Stock
("Option Shares") on the terms and conditions set forth herein and subject to
the provisions of the Plan.

2. Non-Incentive Stock Option. The Option represented hereby is not intended to
be an option that qualifies as an "incentive stock option" under Section 422 of
the Internal Revenue Code of 1986, as amended.

3. Exercise Price. The exercise price of the Option is $4.50 per share.

4. Exercisability. Except as otherwise provided herein, the Option shall be
exercisable from and after the date hereof until the sixth anniversary of the
termination of the Optionee's service with the Company and its Subsidiaries.

5. Method of Exercise.

         5.1 Notice to the Company. The Option shall be exercised in whole or in
part by delivery of written notice of exercise to the Company at its principal
place of business accompanied by full payment as hereinafter provided of the
exercise price for the number of Option Shares specified in the notice.

         5.2 Delivery of Option Shares. The Company shall deliver a certificate
for the Option Shares to the Optionee as soon as practicable after payment
therefor.

         5.3 Payment of Exercise Price. The Optionee shall make cash payments by
wire transfer, certified or bank check or personal check, in each case payable
to the order of the Company; the Company shall not be required to deliver
certificates for Option

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Shares until the Company has confirmed the receipt of good and available funds
in payment of the purchase price thereof. Provided that prior approval of the
Committee has been obtained, the Optionee may use Common Stock owned by the
Optionee for more than six months (or such other period, if any, necessary to
avoid adverse accounting consequences to the Company) to pay the exercise price
for the Option Shares by delivery of stock certificates in negotiable form that
are effective to transfer good and valid title thereto to the Company, free of
any liens or encumbrances. Shares of Common Stock used for this purpose shall be
valued at the Fair Market Value.

6. Nonassignability. The Option shall not be transferable by the Optionee other
than by will or by the laws of descent and distribution, and the Option shall be
exercisable, during the Optionee lifetime, only by the Optionee (or, in the
event of legal incapacity or incompetency, the Optionee's guardian or legal
representative). Notwithstanding the foregoing, the Optionee, with the approval
of the Committee, may transfer all or a portion of the Option (i) (A) by gift,
for no consideration, or (B) pursuant to a domestic relations order in
settlement of marital property rights, in either case, to or for the benefit of
the Optionee's "Immediate Family" (as defined below), or (ii) to an entity in
which the Optionee and/or members of Optionee's Immediate Family own more than
fifty percent of the voting interest, in exchange for an interest in that
entity, subject to such limits as the Committee may establish, and the
transferee shall remain subject to all the terms and conditions applicable to
the Option prior to such transfer. The term "Immediate Family" shall mean any
child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former
spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law,
daughter-in-law, brother-in-law or sister-in-law, including adoptive
relationships, any person sharing the Optionee's household (other than a tenant
or employee), a trust in which these persons have more than fifty percent
beneficial interest, a foundation in which these persons (or the Optionee)
control the management of the assets and any other entity in which these persons
(or the Optionee) own more than 50% of the voting interests.

7. Miscellaneous.

         7.1 Notices. All notices, requests, demands and other communications
that are required or permitted to be given under this Agreement shall be in
writing and shall be either delivered personally or sent by registered or
certified mail, or by private courier to the parties at their respective
addresses set forth herein, or to such other address as either party shall have
specified by notice in writing to the other. Notice shall be deemed duly given
hereunder when delivered or mailed as provided herein.

         7.2 Conflicts with the Plan. This Agreement and the Option shall, in
all respects, be subject to the terms and conditions of the Plan (a copy of
which the Optionee hereby acknowledges receipt of), whether or not stated
herein. In the event of a conflict between the provisions of the Plan and the
provisions of this Agreement, the provisions of the Plan shall in all respects
be controlling.

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         7.3 Stockholder Rights. The Optionee shall not have any of the rights
of a stockholder with respect to the Option Shares until such shares have been
issued after the due exercise of the Option.

         7.4 Waiver. The waiver by any party hereto of a breach of any provision
of this Agreement shall not operate or be construed as a waiver of any other or
subsequent breach.

         7.5 Entire Agreement; Amendments. This Agreement constitutes the entire
agreement between the parties with respect to the subject matter hereof. This
Agreement may not be amended, other than as provided in the Plan, except by
writing executed by the Optionee and the Company.

         7.6 Binding Effect; Successors. This Agreement shall inure to the
benefit of and be binding upon the parties hereto and, to the extent not
prohibited herein, their respective heirs, successors, permitted assigns and
representatives. Nothing in this Agreement, expressed or implied, is intended to
confer on any person other than the parties hereto and, as provided above, their
respective heirs, successors, permitted assigns and representatives, any rights,
remedies, obligations or liabilities.

         7.7 Governing Law. Except as otherwise provided in the Plan, this
Agreement shall be governed by and construed in accordance with the laws of the
State of New York (without regard to choice of law provisions).

         7.8 Headings. The headings contained herein are for the sole purpose of
convenience of reference, and shall not in any way limit or affect the meaning
or interpretation of any of the terms or provisions of this Agreement.

         IN WITNESS WHEREOF, this Agreement is made and entered into as of the
date first above written.

                                      SENTIGEN HOLDING CORP.

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

                                          /s/  Joseph K. Pagano
                                          Joseph K. Pagano

                                                                               3<PAGE>
                                                                    Exhibit 10.1

                                MASTER AGREEMENT

                                   dated as of

                               September 12, 2005

                                     between

                               FORD MOTOR COMPANY

                                       and

                               VISTEON CORPORATION

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                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
SECTION 1. Agreements with respect to the Visteon "A" Business...........     1
SECTION 2. Agreements with respect to the Visteon "B" Business...........     3
SECTION 3. Amendments and Waivers........................................     4
SECTION 4. Expenses......................................................     4
SECTION 5. Successors and Assigns........................................     4
SECTION 6. Governing Law.................................................     4
SECTION 7. Counterparts; Effectiveness; Third Party Beneficiaries........     4
SECTION 8. Entire Agreement..............................................     4
SECTION 9. Severability..................................................     5
</TABLE>

Exhibit A   Visteon "A" Transaction Agreement
Exhibit B   Secured Promissory Note
Exhibit C   Contribution Agreement
Exhibit D   Visteon "B" Purchase Agreement

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                                MASTER AGREEMENT

          MASTER AGREEMENT (this "AGREEMENT") dated as of September 12, 2005
     between Ford Motor Company, a Delaware corporation ("FORD"), and Visteon
     Corporation, a Delaware corporation ("VISTEON").

                                   WITNESSETH:

          WHEREAS, Ford organized Visteon in 2000 and, pursuant to a Master
     Transfer Agreement dated as of March 30, 2000 between Ford and Visteon,
     contributed a substantial portion of its historic automotive component
     operations to Visteon, and on June 28, 2000 distributed all of the issued
     and outstanding shares of common stock of Visteon to Ford's stockholders;

          WHEREAS, Visteon conducts substantial business in North America using
     UAW workers leased from Ford and certain of its own workers (the "VISTEON
     "B" BUSINESS"), and the Visteon "B" Business supplies components to Ford
     that are critical to the conduct of Ford's North American automotive
     business;

          WHEREAS, Visteon conducts business in North America, Europe and the
     rest of the world using its own workers (the "VISTEON "A" BUSINESS"), and
     the Visteon "A" Business supplies components to Ford that are critical to
     Ford's North American, European and rest of world automotive businesses;

          WHEREAS, the restructuring of the Visteon "A" Business and the Visteon
     "B" Business are important to Ford to ensure the continued supply of parts
     and components to Ford and to protect Ford's product programs; and

          WHEREAS, the parties hereto desire to enter into certain agreements
     with respect to the restructuring of the Visteon "A" Business and the
     Visteon "B" Business as set forth herein.

          NOW THEREFORE, in consideration of the above premises and the mutual
     covenants herein contained, and for other good and valuable consideration
     given by each party hereto to the other, the sufficiency and receipt of
     which are hereby acknowledged, the parties hereto, intending to be legally
     bound, agree as follows:

     SECTION 1. Agreements with respect to the Visteon "A" Business. To ensure
the continued supply of parts and components by the Visteon "A" Business to Ford
and to protect Ford's associated product programs:

          (i) Promptly after the execution of this Agreement, Ford and Visteon
     agree to enter into the Visteon "A" Transaction Agreement substantially in
     the form of Exhibit A hereto (the "VISTEON "A" TRANSACTION AGREEMENT")
     pursuant

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     to which, among other things, and subject to the terms and conditions set
     forth therein:

               (A) Visteon shall issue to Ford a Warrant to purchase shares of
          Visteon common stock, par value $1.00 per share, substantially in the
          form of Exhibit J to the Visteon "A" Transaction Agreement, in
          consideration of the payment by Ford of $100 million in cash, which
          amount is included in the funds to be deposited by Ford in escrow
          pursuant to the Escrow Agreement referred to in clause (B) below;

               (B) To assist Visteon in the restructuring of the Visteon "A"
          Business, Ford shall reimburse Visteon up to $550 million in the
          aggregate pursuant to, and in accordance with the terms and conditions
          of, the Escrow Agreement substantially in the form of Exhibit C to the
          Visteon "A" Transaction Agreement and the Reimbursement Agreement
          substantially in the form of Exhibit G to the Visteon "A" Transaction
          Agreement, with respect to certain restructuring and separation costs
          incurred or to be incurred by Visteon in connection therewith;

               (C) Ford shall agree to certain concessions with respect to
          pension- and OPEB-related liabilities and other obligations relating
          to salaried employees associated with the Visteon "A" Business and
          employees associated with the Chesterfield seat plant, in each case as
          set forth in the Visteon "A" Transaction Agreement; and

               (D) Ford and Visteon shall (i) terminate the Purchase and Supply
          Agreement between Ford and Visteon dated as of December 19, 2003 and
          (ii) enter into the Ford-Visteon Purchase and Supply Agreement
          substantially in the form of Exhibit F to the Visteon "A" Transaction
          Agreement; and

          (ii) Ford and Visteon agree to enter into, on September 19, 2005, the
     Secured Promissory Note substantially in the form of Exhibit B hereto (the
     "SECURED PROMISSORY NOTE") pursuant to which Ford shall, subject to
     satisfaction of the condition set forth in the last sentence of this
     Section 1(ii), extend to Visteon a short-term loan in the amount of $250
     million. Visteon shall pay Ford a funding fee equal to (x) 0.50% of the
     initial principal amount of the Secured Promissory Note, which amount shall
     be due and payable on the date of funding of the Secured Promissory Note
     (provided that if the date of funding is later than July 29, 2005, such
     percentage will be reduced by 0.0078125% for each day from and including
     July 29, 2005 to but not including the date of funding), plus (y) for each
     calendar month (or portion thereof) after September 2005 that the Secured
     Promissory Note remains outstanding, 0.25% of the principal amount of the
     Secured Promissory Note outstanding on the first day of such month (or a
     prorated portion thereof based on the number of days to but not including
     the date

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     of payment thereof in full), together with interest thereon accruing from
     the date of funding until payment thereof in full, at the applicable rate
     of interest specified in the Secured Promissory Note, which amount shall be
     due and payable on the date the Secured Promissory Note matures or is
     prepaid in full. Visteon agrees to execute and deliver to Ford, on or
     before the date of funding of the Secured Promissory Note, the Ford
     Security Documents contemplated by the Intercreditor Agreement (as defined
     in the Security Agreement referred to in the Secured Promissory Note), and
     Ford's obligation to fund the Secured Promissory Note is subject to the
     condition that Visteon does so.

     SECTION 2. Agreements with respect to the Visteon "B" Business. To ensure
the continued supply of parts and components by the Visteon "B" Business to Ford
and to protect Ford's associated product programs, promptly after the execution
of this Agreement:

          (i) Visteon agrees to enter into the Contribution Agreement
     substantially in the form of Exhibit C hereto (the "CONTRIBUTION
     AGREEMENT") with VFH Holdings, Inc., a Delaware corporation (the
     "COMPANY"), a newly-formed, wholly-owned subsidiary of Visteon, pursuant to
     which, among other things, and subject to the terms and conditions set
     forth therein, Visteon shall contribute to one or more newly-formed,
     wholly-owned subsidiaries of the Company certain assets and properties
     associated with the Visteon "B" Business; and

          (ii) Ford and Visteon agree to enter into the Visteon "B" Purchase
     Agreement substantially in the form of Exhibit D hereto (the "VISTEON "B"
     PURCHASE AGREEMENT") pursuant to which, among other things, and subject to
     the terms and conditions set forth therein, Ford shall acquire from
     Visteon, and Visteon shall sell to Ford, all of the issued and outstanding
     shares of common stock of the Company in consideration of:

               (A) the payment by Ford to Visteon of an amount in cash, as set
          forth in the Visteon "B" Purchase Agreement, with respect to the
          inventories contributed to the Company's subsidiaries by Visteon
          pursuant to the Contribution Agreement;

               (B) certain concessions by Ford with respect to OPEB liabilities
          and other obligations relating to hourly employees associated with the
          Visteon "B" Business, in each case as set forth in the Visteon "B"
          Purchase Agreement;

               (C) the assumption by Ford of certain liabilities with respect to
          environmental matters associated with the Visteon "B" Business as set
          forth in the Visteon "B" Purchase Agreement; and

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               (D) certain other agreements and obligations of Ford as set forth
          in the Visteon "B" Purchase Agreement.

     SECTION 3. Amendments and Waivers. Any provision of this Agreement may be
amended or waived if, but only if, such amendment or waiver is in writing and is
signed, in the case of an amendment, by each party to this Agreement, or in the
case of a waiver, by the party against whom the waiver is to be effective. No
failure or delay by any party in exercising any right, power or privilege
hereunder shall operate as a waiver thereof nor shall any single or partial
exercise thereof preclude any other or further exercise thereof or the exercise
of any other right, power or privilege.

     SECTION 4. Expenses. Except as otherwise provided herein, all costs and
expenses incurred in connection with this Agreement shall be paid by the party
incurring such cost or expense.

     SECTION 5. Successors and Assigns. The provisions of this Agreement shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns; provided that neither party may
assign, delegate or otherwise transfer any of its rights or obligations under
this Agreement without the consent of each other party hereto.

     SECTION 6. Governing Law. This Agreement shall be governed by and construed
in accordance with the law of the State of Michigan, without regard to the
conflicts of law rules of such state.

     SECTION 7. Counterparts; Effectiveness; Third Party Beneficiaries. This
Agreement may be signed in counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective when each party hereto shall
have received a counterpart hereof signed by the other party hereto. Until and
unless each party has received a counterpart hereof signed by the other party
hereto, this Agreement shall have no effect and no party shall have any right or
obligation hereunder (whether by virtue of any other oral or written agreement
or other communication). No provision of this Agreement is intended to confer
any rights, benefits, remedies, obligations, or liabilities hereunder upon any
Person other than the parties hereto and their respective successors and
assigns.

     SECTION 8. Entire Agreement. This Agreement, the Contribution Agreement,
the other Contribution Agreement Transaction Documents (as defined in the
Contribution Agreement), the Visteon "A" Transaction Agreement, the Visteon "A"
Transaction Documents (as defined in the Visteon "A" Transaction Agreement), the
Visteon "B" Purchase Agreement, the Visteon "B" Transaction Documents (as
defined in the Visteon "B" Purchase Agreement) and the Confidentiality Agreement
(as defined in the Contribution Agreement, it being acknowledged and agreed
that, effective as of the closing under the Contribution Agreement, the terms of
the Confidentiality Agreement

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shall not apply to information included in the "Contributed Assets" as defined
in the Contribution Agreement) constitute the entire agreement between the
parties with respect to the subject matter of such agreements and supersede all
prior agreements and understandings, both oral and written, between the parties
with respect to the subject matter of such agreements.

     SECTION 9. Severability. If any term, provision, covenant or restriction of
this Agreement is held by a court of competent jurisdiction or other authority
to be invalid, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions of this Agreement shall remain in full force and
effect and shall in no way be affected, impaired or invalidated so long as the
economic or legal substance of the transactions contemplated hereby is not
affected in any manner materially adverse to any party. Upon such a
determination, the parties shall negotiate in good faith to modify this
Agreement so as to effect the original intent of the parties as closely as
possible in an acceptable manner in order that the transactions contemplated
hereby be consummated as originally contemplated to the fullest extent possible.

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     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed by their respective authorized officers as of the day and year
first above written.

                                        FORD MOTOR COMPANY

                                        By: /s/ Donat R. Leclair
                                            ------------------------------------
                                        Name:  Donat R. Leclair
                                        Title: Executive Vice President and
                                               Chief Financial Officer

                                        VISTEON CORPORATION

                                        By: /s/ James F. Palmer
                                            ------------------------------------
                                        Name:  James F. Palmer
                                        Title: Executive Vice President and
                                               Chief Financial Officer

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