Document:

<PAGE>

                                  [LOGO C&C]                       EXHIBIT 10.13

================================================================================
                                   SUBLEASE
================================================================================

Sublessor: Rambus Inc., a                Premises: 2465 Latham Street, Suite 200
           Delaware corporation                    & 300 Mountain View, CA 94040

Sublessee: Muse Prime Software, Inc.,    Date:     May 8, 2000
           a Delaware corporation

   This Sublease is made and entered into as of May 8, 2000, by and between
   Rambus Inc., a Delaware corporation (Sublessor), and Muse Prime Software,
   Inc., a Delaware corporation (Sublessee).

                                   Recitals

   A.   Rambus Inc. is the Lessee under that certain Master Lease dated March
        10, 1991, (for reference purposes only) First Amendment to Master Lease
        dated January 12, 1994, (for reference purposes only) and Second
        Amendment to Master Lease dated December 1, 1994, (collectively referred
        to as the "Master Lease"). A copy of the Master Lease is attached hereto
        as Exhibit "A." Any capitalized terms used in this Sublease but not
        defined herein shall have the same meaning attributed to them under the
        Master Lease. South Bay/Latham, a California Limited Partnership, was
        the orignal Lessor under the Master Lease. The present Lessor under the
        Master Lease is Stephen Nakashima.

   B.   Sublessor and Sublessee now desire to enter into the within Sublease for
        the Subleased Premises on the terms and conditions set forth herein.

   Now, therefore, in furtherance of the foregoing and in consideration of the
   mutual covenants set forth below, the parties hereby agree as follows:

1. Sublease:

   Sublessor hereby subleases to Sublessee on the terms and conditions set forth
   herein the Premises described in the Master Lease attached hereto as Exhibit
   A (Subleased Premises).

                                                                     Page 1 of 9
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2. Relation to Master Lease:

   2.1    Except as otherwise stated herein, this Sublease is subject to all of
          the applicable terms and conditions of the Master Lease as if
          Sublessor were the Lessor and Sublessee the Lessee. Sublessee hereby
          assumes and agrees to perform all of the obligations of Lessee under
          the Master Lease to the extent said obligations apply to the Subleased
          Premises and Sublessee's use of the common areas, except as
          specifically set forth herein. Sublessee shall not commit or permit to
          be committed on the Subleased Premises or on any other portion of the
          Project any act or omission which violates any term or condition of
          the Master Lease. Except to the extent waived or consented to in
          writing by the other party or parties hereto who are affected thereby,
          neither of the parties hereto will, by renegotiations of the Master
          Lease, assignment, subletting, default or any other voluntary action,
          avoid or seek to avoid the observance or performance of the terms to
          be observed or performed hereunder by such party but, will at all
          times, in good faith assist in carrying out all the terms of this
          Sublease and in taking all such action as may be necessary or
          appropriate to protect the rights of the other party or parties hereto
          who are affected thereby against impairment. Nothing contained in this
          Section 2.1 or elsewhere in this Sublease shall prevent or prohibit
          Sublessor (a) from exercising its right to terminate the Master Lease
          pursuant to the terms thereof or (b) from assigning its interest in
          this Sublease or subletting the Premises to any other third party.

   2.2    All of the terms and conditions contained in the Master Lease are
          incorporated herein, except as specifically provided below, and shall
          together with the terms and conditions specifically set forth in this
          Sublease constitute the complete terms and conditions of this
          Sublease. The following paragraphs of the Master Lease shall not be
                                                                 ---------
          included in this Sublease: Master Lease Dated 10, 1991 paragraphs 1.1,
          1.5-1.9, 3, 4.1, 5, 39, 50, 51,52, 53, 54, 55, 58; 1/st/ Amendment to
          Lease in its entirety; 2/nd/ Amendment to Lease paragraphs 2, 5, 6, 8,
          9, 11, 12, "Nondisturbance Agreement", "Lease Amendment" (re General
          Magic).

   2.3    Notwithstanding any other term of this Sublease, Sublessor shall not
          be responsible for the performance or the furnishing of any repair,
          replacement or other obligations or services regarding the Subleased
          Premises, which are required to be performed or provided by Master
          Lessor under the Master Lease (including, without limitation, Master
          Lessor's repair obligations as described in Paragraph 7.1 of the
          Master Lease or the maintenance of insurance pursuant to paragraph 8
          of the Master Lease), and Sublessee agrees to look solely to Master
          Lessor for the performance of such obligations. Provided that
          Sublessor has performed all obligations required of Sublessor as
          lessee under the Master Lease (except to the extent such obligations
          have been delegated to Sublessee in this Sublease), Sublessor shall
          have no liability to Sublessee for any failure by Master Lessor to
          perform its obligations under the Master Lease, nor shall such failure
          by Master Lessor excuse performance by Sublessee of its obligations
          under this Sublease. Upon the written request of Sublessee, Sublessor
          shall use good faith efforts to enforce the obligations of Master
          Lessor under the Master Lease as such obligations relate to the
          Sublease Premises, provided that Sublessee shall promptly reimburse
          Sublessor upon demand for all costs and expenses

                                                                     Page 2 of 9
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        (including attorneys' fees) incurred by Sublessor in such enforcement
        efforts if the relevant obligations of Master Lessor.

   2.3  In the event that the consent of Master Lessor is required as a result
        of any request by Sublessee, the failure of Master Lessor to provide
        such consent shall be reasonable grounds for Sublessor to refuse its
        consent.

   2.4  Notwithstanding any other term of this Sublease, Sublessee shall in no
        event have any rights greater than those of Sublessor under the Master
        Lease.

   2.5  Sublessor represents to Sublessee that (A) the Master Lease is in full
        force and effect, (B) the copy of the Master Lease which is attached
        to this sublease as Exhibit A is a true, correct and complete copy of
                            ---------
        the Master Lease, and (C) Sublessor has received no written notice
        that a default exists on the part of Sublessor under the Master Lease.

   2.6  Notwithstanding the above, Sublessee shall have no obligation under
        Paragraph 7.3 (a) of the Master Lease to remove any alteration,
        improvement, addition or Utility Installation installed prior to January
        1, 2001, but at the end of the Sublease Term, Sublessee shall be
        responsible for repairing any damage to the premises pursuant to the
        terms of the Master Lease and this Sublease, including but not limited
        to holes in walls, broken ceiling tiles, etc.

3. Premises:

   The Subleased Premises consists of those Premises more particularly described
   in the Master Lease, attached hereto as Exhibit A. The Subleased Premises
   consist of approximately Thirty One Thousand Four Hundred Thirty Eight
   rentable square feet (31,438+), and are commonly known as 2465 Latham Street,
   Suite 200 & 300, Mountain View, California.

4. Rent:

   Upon execution of this Agreement, Sublessee shall pay to Sublessor as Base
   Rent for the Subleased Premises the sum of Two Hundred Thirty Five Thousand
   Seven Hundred Eighty Five and 00/100 Dollars ($235,785.00), representing the
   first month's Base Rent. Thereafter, Base Rent shall be in accordance with
   the following schedule:

            Months              Amount per square foot/Full Service
            ------              -----------------------------------
             01-12                    $7.50/square foot/month

   Annually, on the anniversary date of the Sublease commencement, the Base Rent
   shall be increased by three percent (3%).

   The rental amount shall be paid, without deductions, offset, prior notice or
   demand. If the commencement date or the termination date of the Sublease
   occurs on a date other than the first day or the last day, respectively, of a
   calendar month, then the Base Rent for such partial month shall be prorated
   and the prorated Base Rent shall be payable on the Sublease commencement date
   or on the first day of the calendar month in which the Sublease termination
   date occurs, respectively.

                                                                     Page 3 of 9
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5. Security Deposit:

   Upon Sublease execution, Sublessee shall deposit with Sublessor a Security
   Deposit in the amount of Two Million Eight Hundred Thousand and 00/100
   Dollars ($2,800,000.00) in the form of an irrevocable Letter of Credit
   acceptable to Sublessor. Annually, on the Anniversary date of the Sublease
   commencement, and provided Sublessee is not then in default and has not been
   in default over the past year, the Letter of Credit shall be reduced by 25%
   (ie: Yr. 2 = $2,122,500.00, Yr. 3 = $1,591,875.00, Yr. 4 = $1,193,906.00,
   etc.) and such Letter of Credit shall remain in force and effect until at
   least 30 days after the expiration of the term of this Sublease . The term
   "Letter of Credit" shall, for the purposes of this Sublease, include any
   replacement or renewal Letter of Credit. Upon issuance of the Letter of
   Credit to Sublessor, Sublessor may draw against the Letter of Credit if (a)
   Sublessee is in default of any term, provision, covenant or condition of this
   Sublease, provided that Sublessor has given written notice to Sublessee under
   the terms of this Sublease and the applicable period of cure (if any) under
   this sublease for such default has expired and the default of Sublessee has
   not been cured, or (b) Sublessee shall fail to deliver or cause to be
   delivered to Sublessor any renewal or replacement Letter of Credit required
   under this Paragraph 5 not later than thirty (30) days prior to the date of
   expiration of the Letter of Credit then held by Sublessor.

   If Sublessee defaults under this Sublease, then Sublessor shall have the
   right to re-enter and take possession of the Subleased Premises and terminate
   Sublessee's interest under this Sublease. Except with respect to a default by
   Sublessee of Sublessee's obligation to pay Rent, if Sublessee's default
   causes Sublessor to default under the Master Lease, Sublessee shall defend,
   indemnify and hold Sublessor harmless from all damages, costs (including
   reasonable attorneys' fees), liability, expenses or claims relating to such
   default. If Sublessee fails to perform any of its obligations under the
   Master Lease (as incorporated herein) and Sublessor performs such obligations
   to prevent or cure a default thereunder, Sublessee shall immediately
   reimburse Sublessor for all of Sublessor's costs and expenses incurred by
   Sublessor in performing Sublessee's obligations, together with interest on
   those sums at the maximum rate permitted by law. The foregoing rights of
   Sublessor are in addition to Sublessor's rights under Paragraph 13.2 of the
   Master Lease as incorporated herein.

6. Rights of Access and Use:

   6.1    Use:

          Sublessee shall use the Subleased Premises only for those proposes
          permitted in the Master Lease, unless Sublessor and Master Lessor
          consent in writing to other uses prior to the commencement thereof.

   6.2    Furniture:

          During the term of the Sublease, Sublessee shall have the right to use
          and maintain all modular furniture, desks, chairs and phone system at
          no charge. At the end of the Sublease term and provided Sublessee is
          not in default, said furniture and systems shall become the property
          of the Sublessee and any taxes due as a result thereof shall be paid
          by Sublessee. Attached as Exhibit "C" to the Sublease is an inventory
          of what shall be included.

7. Sublease Term:

   7.1    Sublease Term:

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          The Sublease term shall be for the period commencing on January 1,
          2001 ("Commencement Date"), and continuing through February 28, 2005.
          In no event shall the Sublease term extend beyond the term of the
          Master Lease.

   7.2    Inability to Deliver Possession:

          In the event Sublessor is unable to deliver possession of the
          Subleased Premises at the commencement of the term for any reason,
          Sublessor shall not be liable for any loss, liability, injury or
          damage caused thereby nor shall this Sublease be void or voidable, but
          Sublessee shall not be liable for Rent until such time as Sublessor
          delivers possession of the Subleased Premises to Sublessee, but the
          term hereof shall not be extended by such delay. If Sublessee, with
          Sublessor's consent, takes possession prior to commencement of the
          term, Sublessee shall do so subject to all the covenants and
          conditions hereof and shall pay Rent for the period ending with
          Commencement Date at the same rental as that prescribed for the first
          month of the term prorated at the rate of 1/30/th/ thereof per day. In
          the event Sublessor has been unable to deliver possession of the
          Sublease Premises by April 1, 2001, Sublessee, at Sublessee's option,
          may terminate this Sublease by giving written notice thereof to
          Sublessor no later than April 10, 2001.

8.   Notices:

     All notices, demands, consents and approvals which may or are required to
     be given by either party to the other hereunder shall be given in the
     manner provided in the Master Lease at the addresses shown below. Sublessor
     shall notify Sublessee of any Event of Default under the Master Lease, or
     of any other event of which Sublessor has actual knowledge which will
     impair Sublessee's ability to conduct its normal business at the Subleased
     Premises, as soon as reasonable practicable following Sublessor's receipt
     of notice from the Lessor of an Event of Default or actual knowledge of
     such impairment.

<TABLE>
     <S>                                                   <C>
     Sublessor's Address: Rambus Inc.                      Sublessee's Address: Muse Prime Software
                          4440 El Camino Real                                   2465 Latham St Suite 200
                          Los Altos, CA 94022                                   Mountain View CA 94040
                    Attn: Ed Larsen                                       Attn: Patrick McConnell
                                                                                CFO

            Phone Number: 650-944-7777                            Phone Number: 650-210-2525
              Fax Number: 654-944-8080                              Fax Number: 650-210-2524
</TABLE>

9.   Broker Fee:

     Upon execution of the Sublease, Sublessor shall pay Cornish & Carey
     Commercial, a licensed real estate broker, fees set forth in a separate
     agreement between Sublessor and Broker for brokerage services rendered by
     Broker to Sublessor in these transactions.

10.  Broker Representation:

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                                S U B L E A S E
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    The only Broker involved in this Sublease is Cornish & Carey Commercial
    representing both the Sublessor and Sublessee. Both Sublessor and Sublessee
    consent to such dual representation and waive any conflict of interest
    arising out of such dual agency.

11. Compliance with Americans With Disabilities Act:

    Sublessee shall be responsible for the installation and cost of any and all
    improvements, alterations or other work required on or to the Subleased
    Premises or to any other portion of the property and/or building of which
    the Subleased Premises are a part, required or reasonably necessary because
    of: (1) Sublessee's use of the Subleased Premises or any portion thereof;
    (2) the use by a Sublessee by reason of assignment or sublease; or (3) both,
    including any improvements, alterations or other work required under the
    Americans With Disabilities Act of 1990. Compliance with the provisions of
    this Section 11 shall be a condition of Sublessor granting its consent to
    any assignment or Sublease of all or portion of this Sublease and the
    Subleased Premises described in this Sublease.

12. Compliance with Nondiscrimination Regulations:

    It is understood that it is illegal for Sublessor to refuse to display or
    sublease the Subleased Premises or to assign, surrender or sell the Master
    Lease, to any person because of race, color, religion, national origin, sex,
    sexual orientation, marital status or disability.

13. Toxic Contamination Disclosure:

    Sublessor and Sublessee each acknowledge that they have been advised that
    numerous federal, state, and/or local laws, ordinances and regulations
    (Laws) affect the existence and removal, storage, disposal, leakage of and
    contamination by materials designated as hazardous or toxic (Toxics). Many
    materials, some utilized in everyday business activities and property
    maintenance, are designated as hazardous or toxic.

    Some of the Laws require that Toxics be removed or cleaned up by landowners,
    future landowners or former landowners without regard to whether the party
    required to pay for "clean up" caused the contamination, owned the property
    at the time the contamination occurred or even knew about the contamination.
    Some items, such as asbestos or PCBs, which were legal when installed, now
    are classified as Toxics and are subject to removal requirements. Civil
    lawsuits for damages resulting from Toxics may be filed by third parties in
    certain circumstances.

    Sublessor and Sublessee each acknowledge that Broker has no specific
    expertise with respect to environmental assessment or physical condition of
    the Subleased Premises, including, but not limited to, matters relating to:
    (i) problems which may be posed by the presence or disposal of hazardous or
    toxic substances on or from the Subleased Premises, (ii) problems which may
    be posed by the Subleased Premises being within the Special Studies Zone as
    designated under the Alquist-Priolo Special Studies Zone Act (Earthquake
    Zones), Section 2621 - 2630, inclusive of California Public Resources Code,
    and (iii) problems which may be posed by the Subleased Premises being within
    a HUD Flood Zone as set forth in the U.S. Department of Housing and Urban
    Development "Special Flood Zone Area Maps", as applicable.

    Sublessor and Sublessee each acknowledge that Broker has not made an
    independent investigation or determination of the physical or environmental
    condition of the Subleased Premises, including, but not limited to, the
    existence or nonexistence of any underground tanks, sumps, piping, toxic or

                                                                     Page 6 of 9
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    ----------------------------------------------------------------------------
                                S U B L E A S E
    ----------------------------------------------------------------------------

    hazardous substances on the Subleased Premises. Sublessee agrees that it
    will rely solely upon its own investigation and/or the investigation of
    professionals retained by it or Sublessor, and neither Sublessor nor
    Sublessee shall rely upon Broker to determine the physical and environmental
    condition of the Subleased Premises or to determine whether, to what extent
    or in what manner, such condition must be disclosed to potential sublessees,
    assignees, purchasers or other interested parties.

14. Rent Abatement and Damages to Personal Property:

    In the event Sublessor, pursuant to the terms of the Master Lease, is
    entitled to and receives rent abatement, then to the extent such rent
    abatement affects the Subleased Premises, Sublessee shall be entitled to
    rent abatement in an amount that the net rentable area of the Subleased
    premises bears to the total net rentable area of the Master Lease, and only
    to the extent any such abatement applies to the Sublease Term. In addition,
    any amounts paid or credited to Sublessor under the terms of the Master
    Lease for damage to personal property shall be credited to Sublessee,
    subject to the same limitations set forth above.

15. Sublessor's Work:

    Sublessor shall provide the space in an "As Is" condition, with all
    operating systems in good working order and repair, all carpets steam
    cleaned and touch up paint on the walls where needed and exposed. Sublessor
    makes no representation or warranty regarding (i) the condition of the
    Subleased Premises, (ii) the compliance of the Subleased Premises with the
    Applicable Requirements or (iii) the suitability of the Subleased Premises
    for Sublessee's intended use.

16. Operating Expenses:

    Sublessee shall be responsible for the pass thru of all Operating Expenses
    pursuant to the Master Lease but using a Base Year of 2000-2001.
    Notwithstanding any term herein or in the Master Lease, the amount of
    Operating Expenses shall not reduce the amount of Base Rent nor shall
    Sublessee receive a credit against Base Rent if the amount of Operating
    Expenses in a Comparison Year is less than the Operating Expenses in the
    Base Year.

17. Subleasing:

    Sublessee shall have the right to sublease the Subleased Premises or assign
    its rights during the Sublease term, pursuant to the terms in the Master
    Lease with the following exception: In the event that Sublessee subleases or
    assigns its right to lease a cumulative total of more than 7500 square feet
    of the Subleased Premises, then fifty percent (50%) of any and all rent or
    other consideration received by Sublessee, initially, during or after the
    Sublease Term (and including the rent or consideration paid for said 7500
    square feet) in excess of the Base Rent called for hereunder (or in case of
    a Sublease of a portion of the Subleased Premises, then in excess of such
    Base Rent fairly allocable to such portion), shall be paid to Sublessor as
    Additional Rent hereunder promptly upon its receipt by Sublessee.
    Notwithstanding the above, Sublessee shall be entitled to deduct from the
    total amount of Additional Rent paid pursuant to this paragraph any
    brokerage commissions paid by Sublessee in connection with such assignment
    or sublease.

18. Consent of Master Lessor:

    This Sublease shall not be effective unless and until Master Lessor provides
    his consent hereto.

                                                                     Page 7 of 9
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    ----------------------------------------------------------------------------
                                S U B L E A S E
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    SUBLESSOR:  RAMBUS INC, A DELAWARE CORPORATION

    ______________________________________
    By:  Ed Larsen                                Date: 5-8-00
         ---------------------------------             ----------------
    Its: SVP, Administration
         ---------------------------------

    SUBLESSEE:  MUSE PRIME SOFTWARE, INC, A DELAWARE CORPORATION

    ______________________________________
    By:  Patrick Mc Connell                       Date: 05 May, 2000
         ---------------------------------             ----------------
    Its: CFO
         ---------------------------------
                                                                     Page 8 of 9
<PAGE>

--------------------------------------------------------------------------------
                                S U B L E A S E
--------------------------------------------------------------------------------

NOTICE TO SUBLESSOR AND SUBLESSEE: CORNISH & CAREY COMMERCIAL, IS NOT AUTHORIZED
TO GIVE LEGAL OR TAX ADVICE; NOTHING CONTAINED IN THIS SUBLEASE OR ANY
DISCUSSIONS BETWEEN CORNISH & CAREY COMMERCIAL AND SUBLESSOR AND SUBLESSEE SHALL
BE DEEMED TO BE A REPRESENTATION OR RECOMMENDATION BY CORNISH & CAREY
COMMERCIAL, OR ITS AGENTS OR EMPLOYEES AS TO THE LEGAL EFFECT OR TAX
CONSEQUENCES OF THIS DOCUMENT OR ANY TRANSACTION RELATING THERETO. ALL PARTIES
ARE ENCOURAGED TO CONSULT WITH THEIR INDEPENDENT FINANCIAL CONSULTANTS AND/OR
ATTORNEYS REGARDING THE TRANSACTION CONTEMPLATED BY THIS PROPOSAL.

Exhibit "A" Master Lease
Exhibit "B" Premises
Exhibit "C" Inventory

LESSOR CONSENT:
The undersigned, Lessor under the Master Lease attached as Exhibit A, hereby
consents to the subletting of the Subleased Premises described herein on the
terms and conditions contained in this Sublease. This Consent shall apply only
to this Sublease and shall not be deemed to be a consent to any other Sublease.

LESSOR: ________________________

By:  _______________________________    Date: _______________________

ATTORNMENT AGREEMENT:

Sublessee shall attorn to Lessor and perform all of Sublessee's obligations
under the Sublease directly to Lessor as if Lessor were the Sublessor under the
Sublease.  If Sublessee is not, at the time of the notice, in default, Lessor
shall continue to recognize the estate of Sublessee created under the Sublease.
If Sublessee is not in default, the Sublease shall continue with the same force
and effect as if Lessor and Sublessor had entered into a lease on the same
provisions as those contained in the Sublease, including, without limitation,
the Sublessee's right to extend the term of the Lease.

LESSOR: ________________________

By:  _______________________________    Date: _______________________

                                                                     Page 9 of 9<PAGE>

                                                                     EXHIBIT 4.1

<TABLE>
<S>                                                                   <C>
          --------                                                                                            --------
            NUMBER                                         CURON                                               SHARES
          CURN                                            MEDICAL
          --------                                                                                            --------

                                                                                                          CUSIP 231292 10 3
                                    INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE         SEE REVERSE FOR CERTAIN DEFINITIONS

                 THIS CERTIFIES THAT

                 is the record holder of

                   FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $0,001 PAR VALUE PER SHARE, OF
                                -----------------                     --------------------
                     ---------------------------- CURON MEDICAL, INC. -------------------------------------
                                -----------------                     --------------------
          transferable only on the books of the Corporation by the holder hereof in person or by duly authorized Attorney upon
          surrender of this certificate properly endorsed. This certificate is not valid until countersigned by the Transfer Agent
          and Registrar.
                    WITNESS the facsimile signatures of its duly authorized officers.

          Dated:

                       /s/ David J. Saul              [SEAL]                     /s/ John W. Morgan
                            SECRETARY                                   PRESIDENT AND CHIEF EXECUTIVE OFFICER

               COUNTERSIGNED AND REGISTERED:
                         CHASEMELLON SHAREHOLDER SERVICES, L.L.C
          By                                 TRANSFER AGENT AND REGISTRAR

                                                       AUTHORIZED SIGNATURE
</TABLE>

<PAGE>

                              CURON MEDICAL, INC.

     THE CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO
REQUESTS THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE PARTICIPATING,
OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF AND
THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR
RIGHTS. SUCH REQUEST MUST BE MADE TO THE CORPORATION'S SECRETARY AT THE
PRINCIPAL EXECUTIVE OFFICE OF THE CORPORATION.

     Keep this Certificate in a safe place. If it is lost, stolen or destroyed,
the Corporation will require a bond of indemnity as a condition to the issuance
of a replacement certificate.

     The following abbreviations, when used in the inscription on the face of
  this certificate, shall be construed as though they were written out in full
  according to applicable laws or regulations:

<TABLE>
<S>                                                      <C>
TEN COM  - as tenants in common                          UNIF GIFT MIN ACT- ________________ Custodian__________________
                                                                                  (Cust)                   (Minor)
TEN ENT  - as tenants by the entireties                                  under Uniform Gifts to Minors
                                                                         Act____________________________________________
JT TEN   - as joint tenants with right                                                    (State)
           of survivor ship and not as
           tenants in common                             UNIF TAF MIN ACT-  ________________ Custodian (until age______)
                                                                                  (Cust)
                                                                            ____________________ under Uniform Transfers
                                                                                  (Minor)

                                                                          to Minors Act_________________________________
                                                                                                   (State)

                              Additional abbreviations may also be used though not in the above list.

For Value Received, __________________________________________________________________________ hereby sell, assign and transfer unto

 PLEASE INSERT SOCIAL SECURITY SECURITY OR OTHER
     IDENTIFYING NUMBER OF ASSIGNEE
-------------------------------------------------

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

------------------------------------------------------------------------------------------------------------------------------------
                          (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE(S)

____________________________________________________________________________________________________________________________________

____________________________________________________________________________________________________________________________________

____________________________________________________________________________________________________________________________________
Shares represented by the within Certificate, and do hereby irrevocably constitute and

appoint __________________________________________________________________________________________________________________ Attorney
to transfer the said Shares on the books of the within named Corporation with full power of substitution in the premises.

Dated ____________________________________________________________      ____________________________________________________________
                                                                        NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND
In presence of                                                          WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE
                                                                        IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR
                                                                        ANY CHANGE WHATEVER.
__________________________________________________________________

__________________________________________________________________

Signatures(s) Guaranteed

By_________________________________________________________________________________

THE SIGNATURES MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN
APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM) PURSUANT TO S.E.C. RULE 17Ag-16.
</TABLE>

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