SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)

 INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b) (c),
         and (d) and AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b)
                               (Amendment No. 1)1

                         Regeneration Technologies, Inc.
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                                (Name of Issuer)

                                  Common Stock
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                         (Title of Class of Securities)

                                   75886N 10 0
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                                 (CUSIP Number)

                               December 31, 2003
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             (Date of Event Which Requires Filing of this Statement)


Check  appropriate  box to designate the rule pursuant to which this Schedule is
filed:

    [ ] Rule 13d-1(b)

    [X] Rule 13d-1(c)

    [ ] Rule 13d-1(d)


--------

     1    The  remainder  of this cover page shall be filled out for a reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

          The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).




--------- ------------------------------ ---------------------------------------
CUSIP NO. 75886N 10 0                                    Page 2 of 5 Pages
         -----------                                          -    -
-------- ------------------------------- ---------------------------------------
1                                     NAME OF REPORTING PERSON
                                      S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE
                                      PERSON (ENTITIES ONLY)

                                      Neil Gagnon
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2                                     CHECK THE APPROPRIATE BOX IF A MEMBER OF A
                                      GROUP*
                                      (a) [ ]
                                      (b) [X]
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3                                     SEC USE ONLY

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4                                     CITIZENSHIP OR PLACE OF ORGANIZATION

                                      United States of America
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                         5            SOLE VOTING POWER

                                      581,426
      NUMBER OF          -------------------------------------------------------
       SHARES            6            SHARED VOTING POWER
    BENEFICIALLY
      OWNED BY                        344,080
        EACH             -------------------------------------------------------
      REPORTING          7            SOLE DISPOSITIVE POWER
       PERSON
        WITH                          560,376
                         -------------------------------------------------------
                         8            SHARED DISPOSITIVE POWER

                                      1,203,351
--------------------------------------------------------------------------------
9                        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
                         REPORTING PERSON

                         1,763,727
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10                       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
                         CERTAIN SHARES* [  ]
--------------------------------------------------------------------------------
11                       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                         6.7%
--------------------------------------------------------------------------------
12                       TYPE OF REPORTING PERSON*

                         IN
--------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!




Item 1(a)    Name of Issuer:

      Regeneration Technologies, Inc.

Item 1(b)    Address of Issuer's Principal Executive Offices:

      11621 Research Circle
      Alachua, Florida  32615

Item 2(a)    Name of Person Filing:

      Neil Gagnon

Item 2(b)    Address of Principal Business Office or, if none, Residence:

      1370 Avenue of the Americas
      Suite 2002
      New York, NY 10019

Item 2(c)    Citizenship:

      United States of America

Item 2(d)    Title of Class of Securities:

      Common Stock

Item 2(e)    CUSIP Number:

      75886N 10 0

Item 3       If this Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b)
             or (c), Check Whether the Person Filing is a:

      Not Applicable

Item 4       Ownership.

Item 4(a)    Amount Beneficially Owned:

         As of December  31, 2003,  Neil Gagnon  beneficially  owned  1,763,727
shares of Common Stock of Regeneration Technologies, Inc., which amount includes
(i)  376,107  shares  beneficially  owned by Mr.  Gagnon  over which he has sole
voting and sole dispositive power; (ii) 20,245 shares  beneficially owned by Mr.
Gagnon over which he has sole voting power and shared  dispositive  power; (iii)
194,700 shares  beneficially owned by Lois Gagnon, Mr. Gagnon's wife, over which
he  has  shared  voting  and  shared   dispositive   power;  (iv)  1,335  shares
beneficially  owed by Mr. Gagnon and Mrs. Gagnon as Joint Tenants



with  Rights  of  Survivorship,  over  which he has  shared  voting  and  shared
dispositive  power;  (v) 77,635  shares  held by the Lois E. and Neil E.  Gagnon
Foundation (the  "Foundation"),  of which Mr. Gagnon is a trustee and over which
he has shared voting and shared  dispositive  power;  (vi) 70,410 shares held by
the Gagnon Family Limited Partnership (the "Partnership") of which Mr. Gagnon is
a partner  and over which he has shared  voting  and shared  dispositive  power;
(vii) 56,449  shares held by the Gagnon  Grandchildren  Trust (the "Trust") over
which Mr.  Gagnon has shared  dispositive  but no voting power;  (viii)  182,612
shares  held by a hedge  fund (of which Mr.  Gagnon is a general  partner)  over
which Mr. Gagnon has sole  dispositive and sole voting power;  (ix) 1,657 shares
held by the Gagnon  Securities LLC P/S Plan (the "Plan") (of which Mr. Gagnon is
a Trustee) over which Mr. Gagnon has sole dispositive and sole voting power; (x)
625 shares held by the Plan,  over which Mr. Gagnon has shared  dispositive  and
sole voting power; and (xi) 781,952 shares held for certain  customers of Gagnon
Securities  LLC (of which Mr.  Gagnon is the Managing  Member and the  principal
owner) over which Mr. Gagnon has shared dispositive but no voting power.

Item 4(b)    Percent of Class:

          6.7% beneficially owned by Mr. Gagnon. Calculation of percentage of
beneficial  ownership  is based on  26,359,181  shares of Issuer's  Common Stock
outstanding  on  November  7, 2003 as  reported  by the Issuer in its  Quarterly
Report filed on Form 10-Q for the period ended September 30, 2003.

Item 4(c) Number of shares as to which such person has:

     (i)  sole power to vote or to direct the vote: 581,426

     (ii) shared power to vote or to direct the vote: 344,080

     (iii)sole power to dispose or to direct the disposition of: 560,376

     (iv) shared power to dispose or to direct the disposition of: 1,203,351

Items 5-9     Not applicable.

          Filing of this  statement by the Reporting  Person shall not be deemed
an admission that he beneficially owns the securities reported herein as held in
customer  accounts  at  Gagnon   Securities  LLC  or  by  the  Foundation,   the
Partnership,  the Trust or the Plan. Mr. Gagnon expressly  disclaims  beneficial
ownership of all securities held in such customer accounts or by the Foundation,
the Partnership,  the Trust or the Plan. No single client's interest as reported
in the customer  accounts at Gagnon Securities LLC exceeds 5% of the outstanding
Common Stock.

Item 10       Certification.

          By  signing  below I certify  that,  to the best of my  knowledge  and
belief, the securities  referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing  the control of the
issuer of the  securities  and were not acquired and are not held in  connection
with or as a participant in any transaction having that purpose or effect.





                                    SIGNATURE

          After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

                                                      February 12, 2004
                                                      --------------------------
                                                      Date


                                                      /s/ Neil Gagnon
                                                      --------------------------
                                                      Neil Gagnon