EXHIBIT

                           PROMISSORY NOTE

$400,000.00


1.  Promise to Pay.

    For value received, I, Stan Benson ("Staff Member"), a married
    man, and I, Joann M. Benson, wife of Staff Member, promise to pay
    to the order of Amgen Inc., a Delaware corporation ("Payee"), at
    its office at Amgen Center, Thousand Oaks, CA  91320-1789, the
    sum of Four Hundred Thousand Dollars ($400,000.00) (the
    "Principal"), payable in full on the earlier of five (5) years
    from date of execution of this Note or thirty (30) days from the
    date on which Staff Member ceases to be an employee of Payee,
    whichever first occurs, together with interest on the Principal
    from the date of this Note until such date as the Note is paid in
    full.  Interest on this Note shall be computed as set forth
    below.  The interest rate for the period from the date of this
    Note through December 31, 1996 (the "initial rate") is 4.1% per
    annum on the unpaid Principal.  After December 31, 1996 the
    interest rate on this Note shall change as set forth below.

2.  Adjustable Interest Rate.

    The interest rate shall be adjusted annually on January 1 of each
    year (the "Change Date") so as to equal the average interest rate
    designated as the "Introduction Rates" on adjustable rate loans
    as publicly offered by the banks and savings and loans in
    California as published by the Los Angeles Times in its Sunday
    edition.  The rate shall be set using the rates published in the
    Los Angeles Times on the Sunday immediately preceding the Change
    Date.  In the event that the "Introduction Rates" list is not
    published in the Los Angeles Times for any reason, then, in such
    event, the Payee shall establish the interest rate based on a
    survey by it of the introductory interest rates on adjustable
    loans offered by no fewer than five banking institutions located
    in Southern California that the Payee, in its sole discretion,
    deems representative of banking institutions in the Ventura and
    Los Angeles County areas.  Payee shall give Staff Member notice
    if the interest rate shall be determined using this alternative
    method.  Notwithstanding the foregoing, the interest rate shall
    never be increased or decreased on any single Change Date by more
    than one

    percentage point from the interest rate for the preceding 12
    months.  At no time during the term of this Note shall the annual
    interest rate exceed 7.1% per annum.

    Payee shall deliver or mail to Staff Member a notice of any
    changes in the adjustable interest rate on this Note and the
    amount of the Staff Member's semi-monthly payroll deductions
    before the effective date of any change.  The notice shall
    include information required by law to be given to Staff Member
    and also the title and telephone number of a person who shall
    answer any questions Staff Member may have regarding the notice.

3.  Salary Deduction.

    The interest on this Note shall be payable by semi-monthly
    deductions from Staff Member's salary.  The amount of such
    deductions shall initially be Six Hundred Eighty-Three and 33/100
    Dollars ($683.33) per installment; provided, however, that the
    manner of payment of this Note shall not be limited to deductions
    from Staff Member's salary.  The amount of such deductions shall
    be adjusted annually concurrently with any adjustment in the
    interest rate on this Note to ensure that interest to be incurred
    during the ensuing calendar year shall be paid in twenty-four
    (24) equal payments.  The first such installment shall be on
    March 31, 1996; the second installment shall be on April 15,
    1996; and each successive installment shall be on the fifteenth
    and last days of each successive month until the Principal is
    repaid.  Payee shall give Staff Member at least seven (7) days
    advance notice of any adjustment in the amount of said payroll
    deductions.  Staff Member acknowledges and agrees that by
    executing this Note, Staff Member agrees to the payroll
    deductions described in this Note.

4.  Option to Convert.
    -----------------
    At the end of the term of this Note, Staff Member shall have the
    option to seek to convert this loan to a loan amortized over an
    additional five-year period by executing a new Promissory Note at
    terms to be mutually agreed upon by Staff Member and Payee.  In
    the event that Staff Member and Payee are unable to reach
    agreement on such terms, this Note shall become immediately due
    and payable.

5.  Prepayment.

    Staff Member may prepay without penalty this Note in whole or in
    part at any time.  Any and all payments or prepayments under this
    Note may be made by Staff Member to Payee at the following
    address (or such other address as it designates in writing to
    Staff Member):

               AMGEN INC.
               Amgen Center
               Thousand Oaks, California 91320-1789

               Attention:  Accounting Manager

6.  Attorneys' Fees.

    Staff Member agrees to pay all costs and expenses, including,
    without limitation, collection agency fees and expenses,
    reasonable attorneys' fees, costs of suit and costs of appeal,
    which Payee may incur in the exercise, preservation or
    enforcement of its right, powers and remedies hereunder, or under
    any documents or instruments securing this Note, or under law.

7.  Modification of Terms.

    Payee may, with or without notice to Staff Member, cause
    additional parties to be added to this Note, or release any party
    to this Note, or revise, extend, or renew the Note, or extend the
    time for making any installment provided for by this Note, or
    accept any installment in advance, all without affecting the
    liability of Staff Member.  Staff Member may not assign or
    transfer in any manner whatsoever this Note or any of Staff
    Member's obligations under this Note.

8.  Security Interest.

    The purpose of this loan is to purchase a personal residence.
    Staff Member shall secure this loan by executing and causing to
    be filed, immediately upon close of escrow, a trust deed on this
    residence, commonly known as 5603 Greyfeather Court, Westlake
    Village, California 91362 whose property description is as
    follows:

    Lot 293 of Tract No. 3507-4, in the City of Thousand Oaks, as per
    map recorded in Book 97, Page 18 of Maps, in the office of the
    County Recorder of Ventura County, California.

9.  Acceleration.

    A) In the event Staff Member fails to pay when due any sums under
    this Note, then:

      (1) the entire unpaid balance of this Note shall, at the option
      of the Payee hereof, immediately become due and payable in full
      and unpaid Principal thereafter shall bear interest at the
      lesser of the maximum rate permitted by law or at the rate of
      7.1% per annum; and

      (2) Staff Member authorizes Payee to deduct any sums due to
      Payee under this Note from any monies, including any wages due,
      otherwise owing to Staff Member.

    B) If Staff Member sells the residence which is purchased with
    the funds herein provided, this Note shall immediately become due
    and payable upon the sale of such residence.

10. Waiver of Rights by Staff Member.

    Staff Member waives (1) presentment, demand, protest, notice of
    dishonor and/or protest and notice of non-payment; (2) the right,
    if any, to the benefit of, or to direct the application of, any
    security hypothecated to Payee until all indebtedness of Staff
    Member to Payee, however arising, has been paid; and (3) the
    right to require the Payee to proceed against any party to this
    Note, or to pursue any other remedy in Payee's power.  Payee may
    proceed against Staff Member directly and independently of any
    other party to this Note, and the cessation of the liability of
    any other party for any reason other than full payment, or any
    revision, renewal, extension, forbearance, change of rate of
    interest, or acceptance, release or substitution of security, or
    any impairment or suspension of Payee's remedies or rights
    against any other party, shall not in any way affect the
    liability of Staff Member.

11. Obligations of Persons Under this Note.

    If more than one person signs this Note, each person is fully and
    personally obligated to keep all of the promises made in this
    Note, including the promise to pay the full amount owed.  Any
    person who is a guarantor, surety, or endorser of this Note is
    also obligated to do these things.  Any person who takes


    over these obligations, including the obligations of a guarantor,
    surety or endorser of this Note, is also obligated to keep all of
    the promises made in this Note.  Payee may enforce its rights
    under this Note against each person individually or against all
    of the signatories to this Note.  This means that any one of the
    signatories to this Note may be required to pay all of the
    amounts owed under this Note.

12. Governing Law.

    This Note and the obligations under this Note of Staff Member or
    any other signatory to this Note shall be governed by and
    interpreted and determined in accordance with the laws of the
    State of California as applied to contracts between California
    residents entered into and to be performed entirely within said
    State.

IN WITNESS WHEREOF, the undersigned have executed and delivered this
Note as of the 19th day of March, 1996.


                         /s/ Stan Benson
                         ____________________                        
                         STAN BENSON


                         /s/ Joann M. Benson
                         ____________________                            
                         JOANN M. BENSON