Document:

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                                                              EXHIBIT 4.3

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<S>                                  <C>                                   <C>
            NUMBER                           REGENERATION-TM-              SHARES
                                             TECHNOLOGIES, INC.
                                      REGENERATION TECHNOLOGIES, INC.
INCORPORATED UNDER THE LAWS OF THE                                         SEE REVERSE FOR CERTAIN
       STATE OF DELAWARE                                                   LEGENDS AND DEFINITIONS

                                                                           CUSIP 75886N 10 D
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 This Certifies that

 is the owner of

 FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, PAR VALUE $.001 EACH OF
                        REGENERATION TECHNOLOGIES, INC.
(hereinafter called the "Corporation") transferable on the books of the
Corporation by the registered holder hereof in person or by duly authorized
attorney, upon surrender of this Certificate properly endorsed or assigned.
This Certificate and the shares represented hereby are issued and shall be
held subject to the laws of the State of Delaware, and to the Certificate of
Incorporation and By-Laws of the Corporation, as now or hereafter amended (a
copy of which is on file with the Transfer Agent and Registrar) to all of
which the holder of this Certificate, by acceptance hereof, assents. This
Certificate is not valid until countersigned and registered by the Transfer
Agent and Registrar.

    Witness the facsimile seal of the Corporation and the facsimile signature
of its duly authorized officers.

COUNTERSIGNED AND REGISTERED:
         CONTINENTAL STOCK TRANSFER AND TRUST COMPANY.
                    [Jersey City, New Jersey]      TRANSFER AGENT
                                                   AND REGISTRAR
AUTHORIZED SIGNATURE

                                   [SEAL]

Dated

/s/ Richard R. Allen                         /s/ James M. Grooms
------------------------------               ----------------------------
    Richard R. Allen                             James M. Grooms
    Secretary and Treasurer                      President and Chief
                                                   Executive Officer

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                         REGENERATION TECHNOLOGIES, INC.

     The record holder of this Certificate may obtain from the Secretary of
the Corporation, upon request and without charge, a full statement of the
designations, voting rights, preferences, limitations and special rights of
the shares of each class or series of shares authorized to be issued so far
as they have been fixed and determined; and the authority of the Board of
Directors to fix and determine the designations, voting rights, preferences,
limitations and special rights of the classes and series of shares of the
Corporation.

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    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:

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<S>                                                 <C>
      TEN COM-  as tenants in common                LINIF GIFT MIN ACT-  _____________ Custodian _____________
      TEN ENT-  as tenants by the entireties                                 (Cust)                  (Minor)
       JT TEN-  as joint tenants with                                    under Uniform Gifts to Minors
                right of survivorship and                                Act _________________________________
                not as tenants in common                                               (State)

</TABLE>

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

     For value received, _________________ hereby sell, assign and transfer unto

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  PLEASE INSERT SOCIAL SECURITY OR
 OTHER IDENTIFYING NUMBER OF ASSIGNEE
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            PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE

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_________________________________________________________________________ Shares
of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint _____________________________________________

____________________________________________________________________ Attorney to
transfer the said stock on the books of the within-named Corporation with
full power of substitution in the premises.

Date,                            X
      ---------------------        ---------------------------------------------

                                 X
                                   ---------------------------------------------

                                   NOTICE: THE SIGNATURE(S); TO THIS ASSIGNMENT
                                   MUST CORRESPOND WITH THE NAMED AS WRITTEN
                                   UPON THE FACE OF THE CERTIFICATE, IN EVERY
                                   PARTICULAR, WITHOUT ALTERATION OR
                                   ENLARGEMENT, OR ANY CHANGE WHATEVER.

SIGNATURE GUARANTEED:
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                                                                   EXHIBIT 10.21

                            INDEMNIFICATION AGREEMENT

                  This INDEMNIFICATION AGREEMENT is made as of August__, 2000,
between Regeneration Technologies, Inc., a Delaware corporation (the "Company"),
and ______________ (collectively with such person's heirs, executors,
administrators and other personal representatives, the "Indemnitee"), an officer
or director of the Company.

                  WHEREAS, the Board of Directors has concluded that Company's
officers, directors, employees and agents should be provided with reasonable and
appropriate protection against inordinate risks in order to insure that the most
capable persons will be attracted to such positions; and, therefore, has
determined to contractually obligate itself to indemnify in a reasonable and
adequate manner its officers and directors, and to assume for itself liability
for expenses and damages in connection with claims lodged against such persons
as a result of their service to the Company;

                  WHEREAS, applicable law empowers corporations to indemnify a
person who serves as a director, officer, employee or agent of a corporation or
a person who serves at the request of a corporation as a director, officer,
employee or agent of another corporation, partnership, joint venture, trust, or
other enterprise; and

                  WHEREAS, the parties believe it appropriate to memorialize and
reaffirm the Company's indemnification obligations to Indemnitee and, in
addition, to set forth the agreements contained herein.

                  NOW, THEREFORE, in consideration of the mutual agreements
herein contained, the parties agree as follows:

                  1. INDEMNIFICATION. Indemnitee shall be indemnified and held
harmless by the Company against any judgments, penalties, fines, amounts paid in
settlement and Expenses (as hereinafter defined) incurred in connection with any
actual or threatened Proceeding (as hereinafter defined) to the fullest extent
permitted by the Company's Certificate of Incorporation (the "Certificate"),
By-Laws and the General Corporation Law of the State of Delaware ("Delaware
Law") as in effect on the date hereof and to such greater extent as Delaware Law
may hereafter from time to time permit. In addition, the Company agrees to
advance to Indemnitee Expenses incurred in connection with the foregoing.
"Proceeding" includes, without limitation, any action, suit, arbitration,
alternate dispute resolution mechanism, investigation, administrative hearing or
any other actual, threatened or contemplated proceeding, whether civil,
criminal, administrative or investigative, whether by a third party, by or in
the right of the Company or by Indemnitee to enforce any rights under this
Agreement or otherwise against the Company or its affiliates.

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                  2. INTERIM EXPENSES. Expenses (including attorneys' fees)
incurred by Indemnitee in defending any civil, criminal, administrative, or
investigative action, suit or proceeding for which Indemnitee may be entitled to
indemnification hereunder shall be paid by the Company in advance of the final
disposition of such action, suit or proceeding upon receipt of an undertaking by
or on behalf of Indemnitee to repay such amount if it shall ultimately be
determined that he or she is not entitled to be indemnified by the Company
hereunder. "Expenses" means all attorneys' fees and expenses, retainers, court
costs, transcript costs, duplicating costs, fees of experts, fees of witnesses,
travel expenses, printing and binding costs, telephone charges, postage and
delivery fees, service fees, all other costs and expenses of the types
customarily incurred in connection with prosecuting, defending, preparing to
prosecute or defend, investigating or being or preparing to be a witness in a
Proceeding, and in the event the Indemnitee is not receiving payment full-time
as an employee of the company, and per diem payments to Indemnitee in an amount
equal to the last annual salary payable under any employment agreement between
the Company and Indemnitee divided by 365 for each day spent by Indemnitee in
connection with prosecuting, defending, preparing to prosecute or defend,
investigating or being or preparing to be a witness in a Proceeding.

                  3. EXCEPTIONS TO INDEMNIFICATIONS. Notwithstanding the
foregoing, no indemnity pursuant to Sections 1 or 2 shall be paid by the
Company:

                           (a)      on account of any suit in which judgment is
rendered against Indemnitee for an accounting of profits made from the purchase
or sale by Indemnitee of securities of the Company pursuant to the provisions of
Section 16(b) of the Securities Exchange Act of 1934 and amendments thereto or
similar provisions of any federal, state or local statutory law;

                           (b)      on account of Indemnitee's conduct which is
finally adjudged to have been knowingly fraudulent or deliberately dishonest, or
to constitute willful misconduct;

                           (c)      on account of Indemnitee's conduct which is
finally adjudged to have constituted a breach of Indemnitee's duty of loyalty to
the Company or resulted in any personal profit or advantage to which Indemnitee
was not legally entitled;

                           (d)      for which payment is actually made to
Indemnitee under a valid and collectible insurance policy or under a valid and
enforceable indemnity clause, bylaw or agreement, except in respect of any
excess beyond payment under such insurance, clause, bylaw or agreements;

                           (e)      if a final decision by a court having
jurisdiction in the matter shall determine that such indemnification is not
lawful; or

                           (f)      in connection with any proceeding (or part
thereof) initiated by Indemnitee, or any proceeding by Indemnitee against the
Company or its directors, officers, employees or other

                                      -2-

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indemnitees, unless (i) such indemnification is expressly required to be made by
law, (ii) the proceeding was authorized by the Board of Directors of the
Company, (iii) such indemnification is provided by the Company, in its sole
discretion, pursuant to the powers vested in the Company under applicable law,
or (iv) the proceeding is initiated pursuant to Section 4 hereof.

                  4. FAILURE TO INDEMNIFY. (a) If a claim under this Agreement,
under any statute, or under any provision of the Certificate or By-Laws
providing for indemnification, is not paid in full by the Company within 45 days
after a written request for payment thereof has first been received by the
Company, Indemnitee may, but need not, at any time thereafter bring an action
against the Company to recover the unpaid amount of the claim and, if successful
in whole or in part, Indemnitee shall also be entitled to be paid for
Indemnitee's reasonable expenses, including attorneys' fees, actually and
necessarily incurred in connection with successfully establishing the right to
indemnification, in whole or in part, in any such action shall also be
indemnified by the Company.

                           (b)      It shall be a defense to any such action
(other than an action brought to enforce a claim for expenses incurred in
connection with any action, suit or proceeding in advance of its final
disposition) that Indemnitee has not met the standards of conduct which make it
permissible under the General Corporation Law of the State of Delaware for the
Company to indemnify Indemnitee for the amount claimed, but the burden of
proving such defense shall be on the Company and Indemnitee shall be entitled to
receive interim payments of Interim Expenses pursuant to Paragraph 2 unless and
until such defense may be finally adjudicated by court order or judgment from
which no further right of appeal exists.

                  5.       CERTAIN AGREEMENTS OF INDEMNITEE.

                  (i) Indemnitee agrees to do all things reasonably requested by
the Board of Directors of the Company to enable the Company to coordinate
Indemnitee's defense with, if applicable, the Company's defense, provided,
however, that Indemnitee shall not be required to take any action that would in
any way prejudice his or her defense or waive any defense or position available
to him or her in connection with any action;

                  (ii) Indemnitee agrees to do all things reasonably requested
by the Board of Directors of the Company to subrogate to the Company any rights
of recovery (including rights to insurance or indemnification from persons other
than the Company) which Indemnitee may have with respect to any action;

                  (iii) Indemnitee agrees to be represented in any action by a
law firm mutually acceptable to the Company and Indemnitee; and

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                  (iv) Indemnitee agrees to cooperate with the Company and its
counsel and maintain any confidences revealed to him or her by the Company in
connection with the Company's defense of any action. The Company agrees to
cooperate with Indemnitee and his or her counsel and maintain any confidences
revealed to it by Indemnitee in connection with Indemnitee's defense of any
action.

                  6. SUCCESSORS. This Agreement establishes contract rights
which shall be binding upon, and shall inure to the benefit of, the successors,
assigns, heirs and legal representatives of the parties hereto.

                  7. CONTRACT RIGHTS NOT EXCLUSIVE. The contract rights
conferred by this Agreement shall be in addition to, but not exclusive of, any
other right which Indemnitee may have or may hereafter acquire under any
statute, provision of the Certificate or By-Laws, agreement, vote of
stockholders or disinterested directors or otherwise.

                  8. INDEMNITEE'S OBLIGATIONS. Indemnitee shall advise the
Company in writing of the institution of any investigation, claim, action, suit,
or proceeding which is or may be subject to this Agreement and generally keep
the Company informed of, and consult with the Company with respect to, the
status of any such investigation, claim action, suit or proceeding.

                  9. SEVERABILITY. Should any provision or paragraph of this
Agreement, or any clause hereof, be held to be invalid, illegal or
unenforceable, in whole or in part, the remaining provisions, paragraphs and
clauses of this Agreement shall remain fully enforceable and binding on the
parties.

                  10. CHOICE OF LAW. The validity, interpretation, performance
and enforcement of this Agreement shall be governed by the laws of the State of
Delaware.

                  11. CONTINUATION OF INDEMNIFICATION. The indemnification under
this Agreement shall continue as to Indemnitee even though he or she may have
ceased to be a director, officer, employee and/or agent of the Company and shall
inure to the benefit of the heirs and personal representatives of Indemnitee.
The Company acknowledges that, in providing services to it, Indemnitee is
relying on this Agreement. Accordingly, the Company agrees that its obligations
hereunder will survive (i) any actual or purported termination of this Agreement
by the Company or its successors or assigns whether by operation of law or
otherwise, (ii) any change in the Certificate or By-Laws and (iii) termination
of the Indemnitee's services to the Company (whether such services were
terminated by the Company or the Indemnitee), whether or not a claim is made or
an action or Proceeding is threatened or commenced before or after the actual or
purported termination of this Agreement, change in the Certificate or By-Laws or
termination of Indemnitee's services.

                                       -4-

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

________________________________________
Name:

REGENERATION TECHNOLOGIES, INC.

By:_____________________________________
         Name:__________________________
         Title:_________________________

                                      -5-

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