**EXHIBIT
      10.6**





**PROTEIN
      POLYMER TECHNOLOGIES, INC.**


**8%
      SECURED PROMISSORY**  **NOTE**


**DUE
      JULY 12, 2006**


**NOW
      DUE AUGUST 10, 2007**


**AMENDMENT
      NO. 6**


**DATED
      AUGUST 9, 2007**





On
      April
      13, 2006, Protein Polymer Technologies, Inc., ("Maker"), issued to Matthew
      J.
      Szulik ("Payee") a note (the “Note”) in the Principal amount of One Million
      ($1,000,000.00) Dollars pursuant to which, among other things, Maker agreed
      to
      pay the Obligations, as defined therein, to Payee on July 12, 2006, or sooner
      as
      otherwise provided therein. On July 12, 2006, Maker and Taurus
      Advisory Group, LLC, now  TAG
      Virgin Islands, Inc. ,
      as
      agent for Payee, (“Agent”) executed Amendment No. 1 to the Note pursuant to
      which, among other things, “July 12, 2006” in the first paragraph of the Note
      was changed to “October 10, 2006.” On August 18, 2006, as of July 14, 2006,
      Maker and Agent executed Amendment No. 2 to the Note pursuant to which, among
      other things, One Million ($1,000,000.00) Dollars” was changed to “One Million
      Five Hundred Thousand ($1,500,000.00) Dollars.” On September 29, 2006, Maker and
      Agent executed Amendment No. 3 to the Note pursuant to which, among other
      things, “One Million Five Hundred Thousand ($1,500,000.00) Dollars” was changed
      to “Two Million Five Hundred Thousand ($2,500,000.00) Dollars,” “October 10,
      2006” was changed to “January 10, 2007” and Section 10 (c) of the Note was
      amended. On January 10, 2007, Maker and Agent executed Amendment No. 4 to the
      Note pursuant to which, among other things, “Two Million Five Hundred Thousand
      ($2,500,000.00) Dollars” was changed to “Four Million ($4,000,000.00) Dollars”
and “January 10, 2007” was changed to “April 10, 2007." On April 10, 2007, Maker
      and Agent executed Amendment No. 5 to the Note pursuant to which, among other
      things, “Four Million ($4,000,000.00) Dollars” was changed to “ Four
      Million Eight Hundred Thousand ($4,800,000.00) Dollars”
and “April 10, 2007” was changed to “August 10, 2007." In accordance with the
      terms of Section 10 (f) thereof, the Note is hereby amended as
      follows:





1.  In
      the
      first paragraph (i) “Four Million Eight Hundred Thousand ($4,800,000.00)
      Dollars” is changed to “Five Million Seven Hundred and Four Thousand
      ($5,704,000.00) Dollars”; and (ii) “August 10, 2007” is changed to “November 10,
      2007.”





Amendment
          No. 6, executed
          on August 9, 2007
 to
          $1,000,000.00 Secured Promissory Note
 of
          Protein Polymer Technologies ,
          Inc.
 payable
          to Mathew
          J.
          Szulik
 dated
          April 13 ,
          2006
          and Amended
 as
          of
          July 12, 2006, July 14, 2006,
 September
          29, 2006, January 10, 2007
 and
          April
          10, 2007


Maker
      shall accrue Interest to Payee as follows: (i) 8% per annum on Principal in
      the
      amount of One Million ($1,000,000.00) Dollars from April 12, 2006 through the
      date that all of the Obligations are paid in full; plus (ii) 8% per annum on
      Principal in the amount of Five Hundred Thousand ($500,000.00) Dollars from
      July
      14, 2006 through the date that all of the Obligations are paid in full; plus
      (iii) 8% per annum on Principal in the amount of One Million ($1,000,000.00)
      Dollars from September 6, 2006 through the date that all of the Obligations
      are
      paid in full; plus (iv) 8% per annum on Principal in the amount of Five Hundred
      Thousand ($500,000.00) Dollars from October 25, 2006 through the date that
      all
      of the Obligations are paid in full; plus (v) 8% per annum on Principal in
      the
      amount of Five Hundred Thousand ($500,000.00) Dollars from November 20, 2006
      through the date that all of the Obligations are paid in full; plus (vi) 8%
      per
      annum on Principal in the amount of Five Hundred Thousand ($500,000.00) Dollars
      from January 4, 2007 through the date that all of the Obligations are paid
      in
      full; plus (vii) 8% per annum on Principal in the amount of Five Hundred
      Thousand ($500,000.00) Dollars from February 21, 2007 through the date that
      all
      of the Obligations are paid in full; plus (viii) 8% per annum on Principal
      in
      the amount of Two Hundred Thousand ($200,000.00) Dollars from March 28, 2007
      through the date that all of the Obligations are paid in full; plus (ix) 8%
      per
      annum on Principal in the amount of One Hundred Thousand ($100,000.00) Dollars
      from April 10, 2007 through the date that all of the Obligations are paid in
      full; plus (x) 8% per annum on Principal in the amount of Two, Hundred Thousand
      ($200,000.00) Dollars from May 11, 2007 through the date that all of the
      Obligations are paid in full; plus (xi) 8% per annum on Principal in the amount
      of Twenty Thousand ($20,000.00) Dollars from June 25, 2007 through the date
      that
      all of the Obligations are paid in full; plus (xii) 8% per annum on Principal
      in
      the amount of One Hundred Thirty Six Thousand ($136,000.00) Dollars from June
      27, 2007 through the date that all of the Obligations are paid in full; plus
      (xiii) 8% per annum on Principal in the amount of Three Hundred Sixty Thousand
      ($360,000.00) Dollars from July 5, 2007 through the date that all of the
      Obligations are paid in full; plus (xiv) 8% per annum on Principal in the amount
      of Eighty Eight Thousand ($88,000.00) Dollars from July 13, 2007 through the
      date that all of the Obligations are paid in full; plus (xv) 8% per annum on
      Principal in the amount of One Hundred Thousand ($100,000.00) Dollars from
      August 2, 2007 through the date that all of the Obligations are paid in
      full.





Counterparts .
      This
      Amendment No. 6 may be executed in one or more counterparts, including by
      facsimile, each of which shall be deemed an original, but all such counterparts
      together shall constitute but one and the same Amendment No. 6.





Governing
      Law .
      This
      Amendment No. 6 shall be governed by and construed in accordance with the
      internal laws (and not the law of conflicts) of such jurisdiction as shall
      be
      determined by Payee.





Except
      as
      set forth above, the Note, as amended pursuant to Amendment
      No. 1,
      Amendment No. 2, Amendment No. 3, Amendment No. 4 and Amendment No. 5, is not
      modified, changed or otherwise amended and remains in full force and effect
      in
      accordance with its terms as amended herein.





(signature
      page to follow)




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Amendment
        No. 6, executed
        on August 9, 2007
 to
        $1,000,000.00 Secured Promissory Note
 of
        Protein Polymer Technologies ,
        Inc.
 payable
        to Mathew
        J.
        Szulik
 dated
        April 13 ,
        2006
        and Amended
 as
        of
        July 12, 2006, July 14, 2006,
 September
        29, 2006, January 10, 2007
 and
        April
        10, 2007


IN
      WITNESS WHEREOF, the undersigned have executed this Amendment No. 6 to the
      Note
      on August 9, 2007.




Protein
                Polymer Technologies,
                Inc., Maker,
              a
                Delaware corporationBy:
            /s/
              William N. Plamondon IIIWilliam
              N. Plamondon IIIChief
              Executive Officer


TAG Virgin Islands, Inc.,as
              agent for
              Matthew
                J. Szulik,
                PayeeBy:
            /s/
              James TagliaferriJames
              Tagliaferri,
              President




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