Document:

<PAGE>

                                                                    Exhibit 10.1

                      AMENDED AND RESTATED PROMISSORY NOTE
                               (Revolving Credit)

$750,000                                                    New York, New York

                                                            December 31, 1998

          FOR VALUE RECEIVED, the undersigned SPECTRUMEDIX CORPORATION (the

"Borrower") hereby promises to pay to DR. JOSEPH ADLERSTEIN (the "Lender")
---------                                                         ------
the principal sum of Seven Hundred Fifty Thousand Dollars ($750,000) (the
"Facility") or, if less, the principal amount of all loans made hereunder, in
 --------
immediately available funds, no later than December 31, 2000, unless otherwise
earlier due hereunder (the "Maturity Date").
                            -------------

          Subject to the terms and conditions set forth herein, the Lender shall
make available to the Borrower, from time to time at Lender's sole and absolute
discretion, revolving credit loans which in the aggregate outstanding principal
amount shall not at any time exceed the Facility, which loans shall be recorded
on the Schedule attached hereto.

          The Borrower promises also to pay interest on the unpaid principal of
each loan hereunder in like money and like funds at said place of payment.  Each
loan shall bear interest on the unpaid principal thereof, for each day from the
date such loan is made until it is paid, at a rate equal to 12% per annum;
provided that the interest rate applicable hereunder shall at all times be the
lesser of (a) the rate specified herein or (b) the maximum permitted by law.

          Interest shall be payable at maturity.  Interest shall also be payable
upon any prepayment hereon (to the extent accrued on the amount thereof); at
maturity (whether by acceleration or otherwise) and after maturity, on demand.

          All payments hereunder shall be made in immediately available funds,
free and clear of any lien, set-off, counterclaim, taxes (withholding or
otherwise), levy or deduction.

          The holder of this Note may convert all or any portion of the unpaid
principal amount of this Note and accrued but unpaid interest hereon (the
"Outstanding Amount") into shares of Series B Preferred Stock of the Borrower at
a rate of one share of Series B Preferred Stock for each $1,000 of the
Outstanding Amount converted, by executing and delivering to the Borrower the
Conversion Notice attached hereto as Exhibit 1.

          The obligations of the Borrower under this Note shall be absolute,
unconditional and irrevocable, and shall be paid strictly in accordance with the
terms of this Note, including without limitation, irrespective of the following
circumstances: (i) the existence of any claim, set-off, defense or other right
which the Borrower may have at any time against the Lender; (ii) the form,
validity, sufficiency, accuracy, or legal effect of any statement or any other
document presented under any Letter of Credit, or any such statement or document
proving to be forged, fraudulent, incorrect or invalid in any respect, or any
statement therein being untrue or inaccurate
<PAGE>

in any respect whatsoever; or (iii) any error, omission, interruption or delay
in the transmission or delivery of any communication.

          Upon the occurrence of any of the following specified events of
default: (a) the Borrower shall default in the due and punctual payment of any
principal, interest or fees due on this Note; (b) the Borrower shall default in
the due payment of $100,000 or more of indebtedness (direct or contingent) for
borrowed money or evidenced by a bond, debenture, note or other security or by
an agreement of guarantee or any holder of any such indebtedness of the Borrower
(or a person acting on their behalf) shall become entitled to cause any such
indebtedness to become, or any such indebtedness shall become, due prior to its
stated maturity; or (c) the Borrower shall suspend or discontinue its business,
or shall make an assignment for the benefit of, or composition with, creditors,
or shall become insolvent or unable or generally fail to pay its debts when due;
or the Borrower shall become a party or subject to any liquidation or
dissolution action or proceeding with respect to the Borrower or any bankruptcy,
reorganization, insolvency or other proceeding for the relief of financially
distressed debtors with respect to the Borrower, or a receiver, liquidator,
custodian or trustee shall be appointed for the Borrower or a substantial part
of its assets and, if any of the same shall occur involuntarily as to the
Borrower, it shall not be dismissed, stayed or discharged within 90 days; or if
any order for relief shall be entered against the Borrower under Title 11 of the
United States Code, or the Borrower shall take any action to effect, or which
indicates its acquiescence in any of the foregoing; then, and in any such event,
and at any time thereafter if any such event of default shall then be
continuing, the Lender may, by written notice to the Borrower, declare the
principal of, and interest on, this Note to be immediately due and payable and
the Lender's commitment to lend hereunder to be terminated, all without
presentment, demand, protest or other notice of any kind; provided that, if an
event set forth in clause (c) occurs and is continuing, the principal of, and
interest on, this Note shall be automatically due and payable and the Lender's
commitment to lend hereunder shall be automatically terminated, all without
presentment, demand, protest or other notice of any kind.

          The Borrower represents and warrants that (i) all acts, filings,
conditions and things required to be done and performed and to have happened
(including, without limitation, the obtaining of necessary governmental
approvals) precedent to the issuance of this Note to constitute this Note the
duly authorized, legal, valid and binding obligations of the Borrower,
enforceable in accordance with its terms have been done, performed and have
happened in due and strict compliance with all applicable laws; (ii) the
issuance and performance of this Note will not violate any law, rule,
regulation, order, decree, permit, agreement or instrument to which the Borrower
is a party or is subject, or its charter or by-laws, or result in the imposition
of any lien upon any of the Borrower's assets; (iii) the proceeds of the loans
will not be used to "purchase" or "carry" "margin stock" as such terms are used
in Regulation U of the Board of Governors of the Federal Reserve System; and
(iv) the Borrower is in material compliance with all applicable laws.

          At the option of the Borrower, this Note may be prepaid in whole or in
part without premium or penalty.  The Borrower waives presentment, demand,
protest or notice of any kind in connection with this Note and agrees to pay to
the holder hereof, on demand, all costs and expenses (including reasonable legal
fees) incurred in connection with the enforcement and collection of this Note.
<PAGE>

          This Note shall be binding upon and inure to the benefit of and be
enforceable by the respective successors and assigns of the parties hereto, and,
in particular, shall inure to the benefit of the holders from time to time of
the Note; provided, however, that the Borrower may not assign or transfer its
rights or obligations hereunder without the prior written consent of the Lender.

          THIS NOTE SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE
LAWS OF THE STATE OF NEW YORK WITHOUT REFERENCE TO ITS PRINCIPLES OF CONFLICTS
OF LAWS.

          The Borrower agrees that any legal action or proceeding with respect
to this Note against the Borrower may be brought in the courts of the State of
New York located in the city of New York, Borough of Manhattan, or of the United
States of America of the Southern District of New York, and the Borrower
consents to such jurisdiction, and that such service shall be deemed effected 10
days after mailing thereof.  Nothing herein shall affect the right of the Lender
to serve process in any other manner permitted by law or to commence legal
proceedings in any other jurisdiction.

                         SPECTRUMEDIX CORPORATION

                         By:  /s/ Joseph K. Adlerstein
                              ------------------------
                         Name:  Joseph K. Adlerstein
                         Title:  Chief Executive Officer

                         Address:  2124 Old Gatesburg Road
                                   State College, Pennsylvania  16803
                         Jurisdiction of
                         Organization:  Delaware<PAGE>

                                                                    Exhibit 10.2

                            SPECTRUMEDIX CORPORATION
                           NON-QUALIFIED STOCK OPTION
                           --------------------------

          THIS STOCK OPTION (this "option") is granted as of January 13, 2000
(the "Grant Date") by SPECTRUMEDIX CORPORATION (the "Corporation") to JOSEPH K.
ADLERSTEIN ("Optionee").

                                    RECITALS
                                    --------

A.  The Board has determined that it is in the best interests of the Corporation
to grant to Optionee the non-qualified stock options documented herein in order
to reward Optionee for his past performance and in order to provide proper
incentives to Optionee.

B.  All capitalized terms in this option shall have the meaning assigned to them
in the attached Appendix.

          NOW, THEREFORE, it is hereby agreed as follows:

1.  Grant of Option.  Subject to the terms and conditions hereinafter set forth,
    ---------------
the Corporation, with the approval of the Board, hereby grants to Optionee, as
of the Grant Date, an option to purchase up to 100,000 Option Shares at the
purchase price of $0.125 per share (the "Exercise Price").  This option is a
Non-Statutory Option.

2.  Option Term.  This option shall have a maximum term of ten (10) years
    -----------
measured from the Grant Date and shall accordingly expire at the close of
business on January 13, 2010 (the "Expiration Date"), unless sooner terminated
in accordance with Paragraph 5 or 6.

3.  Limited Transferability.  This option shall be neither transferable nor
    -----------------------
assignable by Optionee other than by will or by the laws of descent and
distribution following Optionee's death and may be exercised, during Optionee's
lifetime, only by Optionee.  Notwithstanding the foregoing, this option may, in
connection with Optionee's estate plan, be assigned in whole or in part during
Optionee's lifetime to one or more members of Optionee's immediate family or to
a trust established exclusively for Optionee and/or one or more such family
members.  The assigned portion shall be exercisable only by the person or
persons who acquire a proprietary interest in the option pursuant to such
assignment.  The terms applicable to the assigned portion shall be the same as
those in effect for this option immediately prior to such assignment and shall
be set forth in such documents issued to the assignee as the Corporation may
deem appropriate.

4.  Dates of Exercise.  This option shall be exercisable with respect to 33,333
    -----------------
Option Shares upon the first sale or lease by the Company of a high-speed DNA
sequencer (the "DNA Sequencer").  This option shall become exercisable with
respect to an additional 33,333 Option Shares immediately after the Company's
revenues from the sale or lease of DNA Sequencers equal $1,000,000.  This option
shall become exercisable with respect to the remaining 33,334 Option Shares
immediately after the Company's
<PAGE>

revenues from the sale or lease of DNA Sequencers equal $3,400,000. This option
shall terminate on December 31, 2000 with respect to any Option Shares for which
it is not exercisable by such date.

5.  Cessation of Service.  The option term specified in Paragraph 2 shall
    --------------------
terminate (and this option shall cease to be outstanding) prior to the
Expiration Date should any of the following provisions become applicable:

(a)  Should Optionee cease to remain in Service for any reason (other than
     death, Disability or Misconduct) while this option is outstanding, then
     Optionee shall have a period of three (3) months (commencing with the date
     of such cessation of Service) during which to exercise this option, but in
     no event shall this option be exercisable at any time after the Expiration
     Date.

(b)  If Optionee dies while this option is outstanding, then the personal
     representative of Optionee's estate or the person or persons to whom the
     option is transferred pursuant to Optionee's will or in accordance with the
     laws of descent and distribution shall have the right to exercise this
     option.  Such right shall lapse, and this option shall cease to be
     outstanding, upon the earlier of (i) the expiration of the twelve (12)
     month period measured from the date of Optionee's death or (ii) the
     Expiration Date.

(c)  Should Optionee cease Service by reason of Disability while this option is
     outstanding, then Optionee shall have a period of twelve (12) months
     (commencing with the date of such cessation of Service) during which to
     exercise this option.  In no event shall this option be exercisable at any
     time after the Expiration Date.

(d)  During the limited period of post-Service exercisability, this option may
     not be exercised in the aggregate for more than the number of vested Option
     Shares for which the option is exercisable at the time of Optionee's
     cessation of Service.  Upon the expiration of such limited exercise period
     or (if earlier) upon the Expiration Date, this option shall terminate and
     cease to be outstanding for any vested Option Shares for which the option
     has not been exercised.  However, this option shall, immediately upon
     Optionee's cessation of Service for any reason, terminate and cease to be
     outstanding with respect to any Option Shares in which Optionee is not
     otherwise at that time vested or for which this option is not otherwise at
     that time exercisable.

(e)  Should Optionee's Service be terminated for Misconduct, then this option
     shall terminate immediately and cease to remain outstanding.

6.  Special Acceleration of Option.
    ------------------------------

(a)  This option, to the extent outstanding at the time of a Corporate
     Transaction but not otherwise fully exercisable, shall automatically
     accelerate so that this option shall, immediately prior to the effective
     date of the Corporate Transaction, become exercisable for all of the Option
     Shares at the time subject to this option and may be exercised for any or
     all of those Option Shares as fully-vested shares of Common Stock.  No such
     acceleration of this option, however, shall occur if and to the extent: (i)
     this option is, in connection with the Corporate Transaction, to be assumed
     by the successor
<PAGE>

     corporation (or parent thereof) or (ii) this option is to be replaced with
     a cash incentive program of the successor corporation which preserves the
     spread existing at the time of the Corporate Transaction on the Option
     Shares for which this option is not otherwise at that time exercisable (the
     excess of the Fair Market Value of those Option Shares over the aggregate
     Exercise Price payable for such shares) and provides for subsequent pay-out
     in accordance with the same Exercise Schedule in effect for those Option
     Shares.

(b)  Immediately following the Corporate Transaction, this option shall
     terminate and cease to be outstanding, except to the extent assumed by the
     successor corporation (or parent thereof) in connection with the Corporate
     Transaction.

(c)  If this option is assumed in connection with a Corporate Transaction, then
     this option shall be appropriately adjusted, immediately after such
     Corporate Transaction, to apply to the number and class of securities which
     would have been issuable to Optionee in consummation of such Corporate
     Transaction had the option been exercised immediately prior to such
     Corporate Transaction, and appropriate adjustments shall also be made to
     the Exercise Price, provided the aggregate Exercise Price shall remain the
     same.

(d)  This option may also be subject to acceleration in whole or in part in
     accordance with the terms of any special Addendum attached to this option.

(e)  This option shall not in any way affect the right of the Corporation to
     adjust, reclassify, reorganize or otherwise change its capital or business
     structure or to merge, consolidate, dissolve, liquidate or sell or transfer
     all or any part of its business or assets.

7.  Adjustment in Option Shares.  Should any change be made to the Common Stock
    ---------------------------
by reason of any stock split, stock dividend, recapitalization, combination of
shares, exchange of shares or other change affecting the outstanding Common
Stock as a class without the Corporation's receipt of consideration, appropriate
adjustments shall be made to (i) the total number and/or class of securities
subject to this option and (ii) the Exercise Price in order to reflect such
change and thereby preclude a dilution or enlargement of benefits hereunder.

8.  Stockholder Rights.  The holder of this option shall not have any
    ------------------
stockholder rights with respect to the Option Shares until such person shall
have exercised the option, paid the Exercise Price and become a holder of record
of the Option Shares.

9.  Manner of Exercising Option.
    ---------------------------

(a)  In order to exercise this option with respect to all or any part of the
     Option Shares for which this option is at the time exercisable, Optionee
     (or any other person or persons exercising the option) must take the
     following actions:

     (i)  Pay the aggregate Exercise Price for the Option Shares in one or more
          of the following forms:
<PAGE>

(A)  cash or check made payable to the Corporation; or

(B)  a promissory note payable to the Corporation, but only to the extent
     authorized by the Corporation in accordance with Paragraph 13.

(C)  in shares of Common Stock held by Optionee (or any other person or persons
     exercising the option) for the requisite period necessary to avoid a charge
     to the Corporation's earnings for financial reporting purposes and valued
     at Fair Market Value on the Exercise Date; or

(D)  through a special sale and remittance procedure pursuant to which Optionee
     (or any other person or persons exercising the option) shall concurrently
     provide irrevocable instructions (a) to a Corporation-designated brokerage
     firm to effect the immediate sale of the purchased shares and remit to the
     Corporation, out of the sale proceeds available on the settlement date,
     sufficient funds to cover the aggregate Exercise Price payable for the
     purchased shares plus all applicable Federal, state and local income and
     employment taxes required to be withheld by the Corporation by reason of
     such exercise and (b) to the Corporation to deliver the certificates for
     the purchased shares directly to such brokerage firm in order to complete
     the sale.

          Except to the extent the sale and remittance procedure is utilized in
connection with the option exercise, payment of the Exercise Price must
accompany the Notice of Exercise delivered to the Corporation in connection with
the option exercise.

               Furnish to the Corporation appropriate documentation that the
     person or persons exercising the option (if other than Optionee) have the
     right to exercise this option.

               Make appropriate arrangements with the Corporation (or Parent or
     Subsidiary employing or retaining Optionee) for the satisfaction of all
     Federal, state and local income and employment tax withholding requirements
     applicable to the option exercise.

(b)  As soon as practical after the Exercise Date, the Corporation shall issue
     to or on behalf of Optionee (or any other person or persons exercising this
     option) a certificate for the purchased Option Shares, with the appropriate
     legends affixed thereto.

(c)  In no event may this option be exercised for fractional shares.

10.  Compliance with Laws and Regulations.
     ------------------------------------

(a)  The exercise of this option and the issuance of the Option Shares upon such
     exercise shall be subject to compliance by the Corporation and Optionee
     with all applicable requirements of law relating thereto and with all
     applicable regulations of any stock exchange (or the Nasdaq National
     Market, if applicable) on which the Common
<PAGE>

     Stock may be listed for trading at the time of such exercise and issuance.

(b)  The inability of the Corporation to obtain approval from any regulatory
     body having authority deemed by the Corporation to be necessary to the
     lawful issuance and sale of any Option Shares pursuant to this option shall
     relieve the Corporation of any liability with respect to the non-issuance
     or sale of the Option Shares as to which such approval shall not have been
     obtained.  The Corporation, however, shall use its best efforts to obtain
     all such approvals.

11.  Successors and Assigns.  Except to the extent otherwise provided in
     ----------------------
Paragraphs 3 and 6, the provisions of this Agreement shall inure to the benefit
of, and be binding upon, the Corporation and its successors and assigns and
Optionee, Optionee's assigns and the legal representatives, heirs and legatees
of Optionee's estate.

12.  Notices.  Any notice required to be given or delivered to the Corporation
     -------
under the terms of this Agreement shall be in writing and addressed to the
Corporation at its principal corporate  offices.  Any notice required to be
given or delivered to Optionee shall be in writing and addressed to Optionee at
112 81st Street, Kew Gardens, New York.  All notices shall be deemed effective
upon personal delivery or upon deposit in the U.S. mail, postage prepaid and
properly addressed to the party to be notified.

13.  Financing.  The Corporation may, in its absolute discretion and without any
     ---------
obligation to do so, permit Optionee to pay the Exercise Price for the purchased
Option Shares by delivering a full-recourse promissory note payable to the
Corporation.  The terms of any such promissory note (including the interest
rate, the requirements for collateral and the terms of repayment) shall be
established by the Corporation in its sole discretion.

14.  Governing Law.  THE INTERPRETATION, PERFORMANCE AND ENFORCEMENT OF THIS
     -------------
AGREEMENT SHALL BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK WITHOUT
REFERENCE TO ITS PRINCIPLES OF CONFLICTS OF LAWS.

                              SPECTRUMEDIX CORPORATION

                              By:   /s/ Joseph K. Adlerstein
                                  --------------------------
                                 Name:  Joseph K. Adlerstein
                                 Title:  Chief Executive Officer
<PAGE>

                                   EXHIBIT I

                               NOTICE OF EXERCISE

          I hereby notify SpectruMedix Corporation, (the "Corporation") that I
elect to purchase __________ shares of the Corporation's Common Stock (the
"Purchased Shares") at the option exercise price of $0.125 per share (the
"Exercise Price") pursuant to that certain option (the "Option") granted to me
on January 13, 2000.

          Concurrently with the delivery of this Exercise Notice to the
Corporation, I shall hereby pay to the Corporation the Exercise Price for the
Purchased Shares in accordance with the provisions of my agreement with the
Corporation (or other documents) evidencing the Option and shall deliver
whatever additional documents may be required by such agreement as a condition
for exercise.

___________, 2000
Date

                              ________________________
                              Optionee

                     Address: ________________________
                              ________________________

Print name in exact manner
it is to appear on the stock
certificate:                  ___________________________

Address to which certificate
is to be sent, if different
from address above:           ___________________________
                              ___________________________

Social Security Number:
                              ___________________________
<PAGE>

                                    APPENDIX
                                    --------

     The following definitions shall be in effect
under the Agreement:

A.  Board shall mean the Corporation's Board of Directors.
    -----

B.  Code shall mean the Internal Revenue Code of 1986, as amended.
    ----

C.  Common Stock shall mean the Corporation's common stock.
    ------------

D.  Corporate Transaction shall mean either of the following stockholder-
    ---------------------
    approved transactions to which the Corporation is a party:

               (i) a merger or consolidation in which securities possessing more
     than fifty percent (50%) of the total combined voting power of the
     Corporation's outstanding securities are transferred to a person or persons
     different from the persons holding those securities immediately prior to
     such transaction, or

               (ii) the sale, transfer or other disposition of all or
     substantially all of the Corporation's assets in complete liquidation or
     dissolution of the Corporation.

E.  Corporation shall mean SpectruMedix Corporation, a Delaware corporation, and
    -----------
    any successor corporation which assumes the Plan and the outstanding options
    thereunder, including the option evidenced by this Agreement.

F.  Disability or Disabled shall mean the inability of the Optionee to engage in
    ----------------------
    any substantial gainful activity by reason of any medically determinable
    physical or mental impairment expected to result in death or to be of
    continuous duration of twelve (12) months or more.

G.  Employee shall mean an individual who is in the employ of the Corporation
    --------
    (or any Parent or Subsidiary), subject to the control and direction of the
    employer entity as to both the work to be performed and the manner and
    method of performance.

H.  Exercise Date shall mean the date on which the option shall have been
    -------------
    exercised in accordance with Paragraph 9 of the Agreement.

I.  Exercise Price shall mean the exercise price per share as specified in
    --------------
    Section 1 of the option.

J.  Exercise Schedule shall mean the schedule specified in Section 4 of the
    -----------------
    option pursuant to which the option is to become exercisable for the Option
    Shares in a series of installments over Optionee's period of Service.

K.  Expiration Date shall mean the date on which the option expires as specified
    ---------------
    in Section 2 of the option.
<PAGE>

L.  Fair Market Value per share of Common Stock on any relevant date shall be
    -----------------
    determined in accordance with the following provisions:

               (i) If the Common Stock is at the time traded on the Nasdaq
     National Market, then the Fair Market Value shall be the closing selling
     price per share of Common Stock on the date in question, as the price is
     reported by the National Association of Securities Dealers on the Nasdaq
     National Market.  If there is no closing selling price for the Common Stock
     on the date in question, then the Fair Market Value shall be the closing
     selling price on the last preceding date for which such quotation exists.

               (ii) If the Common Stock is at the time listed on any Stock
     Exchange, then the Fair Market Value shall be the closing selling price per
     share of Common Stock on the date in question on the Stock Exchange
     determined by the Corporation to be the primary market for the Common
     Stock, as such price is officially quoted in the composite tape of
     transactions on such exchange.  If there is no closing selling price for
     the Common Stock on the date in question, then the Fair Market Value shall
     be the closing selling price on the last preceding date for which such
     quotation exists.

               (iii)  If the Fair Market Value of Common Stock is not
     determinable pursuant to subparagraph (i) or (ii) of this provision, then
     the Fair Market Value shall be determined by the Board, after taking into
     account such factors as it shall deem appropriate.

M.  Grant Date shall mean the date of grant of the option as specified in the
    ----------
    option.

N.  Misconduct shall mean the commission of any act of fraud, embezzlement or
    ----------
    dishonesty by Optionee, any unauthorized use or disclosure by Optionee of
    confidential information or trade secrets of the Corporation (or any Parent
    or Subsidiary), or any other intentional misconduct by Optionee adversely
    affecting the business or affairs of the Corporation (or any Parent or
    Subsidiary) in a material manner. The foregoing definition shall not be
    deemed to be inclusive of all the acts or omissions which the Corporation
    (or any Parent or Subsidiary) may consider as grounds for the dismissal or
    discharge of Optionee or any other person in the Service of the Corporation
    (or any Parent or Subsidiary).

O.  1934 Act shall mean the Securities Exchange Act of 1934, as amended.
    --------

P.  Non-Statutory Option shall mean an option not intended to satisfy the
    --------------------
    requirements of Code Section 422.

Q.  Notice of Exercise shall mean the notice of exercise in the form attached
    ------------------
    hereto as Exhibit I.

R.  Option Shares shall mean the number of shares of Common Stock subject to the
    -------------
    option as specified in Section 1 of the option.

S.  Optionee shall mean the person to whom the option is granted as specified in
    --------
    the Grant Notice.
<PAGE>

T.  Parent shall mean any corporation (other than the Corporation) in an
    ------
    unbroken chain of corporations ending with the Corporation, provided each
    corporation in the unbroken chain (other than the Corporation) owns, at the
    time of the determination, stock possessing fifty percent (50%) or more of
    the total combined voting power of all classes of stock in one of the other
    corporations in such chain.

U.  Service shall mean the Optionee's performance of services for the
    -------
    Corporation (or any Parent or Subsidiary) in the capacity of an Employee, a
    non-employee member of the board of directors or a consultant or independent
    advisor.

V.  Stock Exchange shall mean the American Stock Exchange or the New York Stock
    --------------
    Exchange.

W.  Subsidiary shall mean any corporation (other than the Corporation) in an
    ----------
    unbroken chain of corporations beginning with the Corporation, provided each
    corporation (other than the last corporation) in the unbroken chain owns, at
    the time of the determination, stock possessing fifty percent (50%) or more
    of the total combined voting power of all classes of stock in one of the
    other corporations in such chain.

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