MACROPORE INC
EX-10.23
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<TYPE>EX-10.23
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<DESCRIPTION>EX-10.23
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<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT 10.23</font></b></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">MacroPore
Biosurgery, Inc.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2004 Equity
Incentive Plan of MacroPore Biosurgery, Inc.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">OPTION EXERCISE</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">AND</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">STOCK PURCHASE
AGREEMENT</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Instructions</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font>Read the entire
Agreement carefully.&#160; This is a legally
binding agreement between you and the Company.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Items A &#150; C:</font></b>&#160; insert
your name and identifying information.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Items D-G:</font></b>&#160; identify
the stock option you want to exercise.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Item H:</font></b>&#160; identify how
many shares you want to purchase.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Item I:</font></b>&#160; Calculate the
Option Price by multiplying the share number in Item H by the purchase price
per share in Item E.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Item J:</font></b>&#160; Confirm with
the Company whether a tax withholding amount should be entered in this space.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">7.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Item K:</font></b>&#160; Add the
Option Price in Item I to the tax withholding amount, if any, in Item J.&#160; Insert the resulting Purchase Price in Item
K.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Item L:</font></b>&#160; Identify your
approved method of payment for the Shares.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160; </font><b><font style="font-weight:bold;">Signatures:&#160; </font></b>Sign the
Agreement in the space provided on page10.&#160;
<b><i><font style="font-style:italic;font-weight:bold;">Important note:&#160; </font></i></b>If you are married, your
spouse also is required to sign.</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.</font><font size="1" style="font-size:8.5pt;">&#160;&#160; </font>Submit the fully
completed and signed Agreement, together with payment of the Purchase Price, to
Sally Davis, Director of Human Resources and Administration.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">MacroPore
Biosurgery, Inc.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2004 Equity
Incentive Plan of MacroPore Biosurgery, Inc.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">OPTION EXERCISE
AND</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">STOCK PURCHASE
AGREEMENT</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">OPTIONHOLDER
/ PURCHASER</font></b></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(A)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Name:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(B)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Employee
number:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(C)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Residence
address:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">STOCK
OPTION</font></b></p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(D)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Option
Shares (total) subject to this Option:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(E)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Purchase
Price per Share:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(F)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Grant
Date:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(G)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Option
Control Number:</p>

<p style="margin:0in 0in .0001pt 1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">OPTION
SHARES PURCHASED UNDER THIS AGREEMENT</font></b></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(H)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Shares
purchased:</p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Option
Price [ (E) x (H) ]:</p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(J)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Tax
withholding (if applicable):</p>

<p style="margin:0in 0in .0001pt 3.0in;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(to be calculated by
Company)</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(K)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Purchase
Price [ (I) + (J) ]:</p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PAYMENT
METHOD </font></b><i><font style="font-style:italic;">(select one or more)</font></i></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0in;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(L)</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Cash
or check (enclosed):</p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wire transfer:</font></p>

<p style="margin:0in 0in .0001pt 2.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Identify sending
bank and wire transfer number)</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#147;Cashless exercise&#148;:</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Identify approved
NASD broker-dealer and attach agreement) </font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Other:</font></p>

<p style="margin:0in 0in .0001pt 2.0in;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Attach Company
approval for other form of payment)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

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<h1 style="font-size:10.0pt;margin:0in 0in .0001pt;page-break-after:auto;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.</font></b><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><i><font style="font-style:italic;">Exercise of Option.</font></i></h1>

<h1 style="margin:0in 0in .0001pt;page-break-after:auto;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></h1>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.1.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>I
am exercising my right to purchase the number of shares of common stock of
MacroPore Biosurgery, Inc. indicated on Line (H) by exercising the option
identified on Lines (D) through (G).&#160; The
per share purchase price of the option is indicated on Line (E) and the
aggregate purchase price of the shares I am purchasing is indicated on Line
(I).&#160; I acknowledge that I may be
responsible for tax withholding on the shares, in which case the aggregate
purchase price would be as indicated on Line (K) (which the Company will
complete).&#160;&#160; The shares that I am
purchasing by exercising my option are referred to in this agreement as the &#147;Shares&#148;.&#160; The total purchase price of the shares is
referred to in this agreement as the &#147;Purchase Price&#148;.&#160; I acknowledge that the option I am exercising
was issued under and is subject to the rules of the 2004 Equity Incentive Plan
of MacroPore Biosurgery, Inc. (the &#147;Plan&#148;).</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.2.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>With
this signed agreement, I have submitted either (a) cash or a check for the
amount of the Purchase Price or (b) irrevocable wire transfer instructions for
the Purchase Price, or (c) a certificate or certificates (or designation of
such certificates if permitted by the Plan) representing shares of MacroPore
Biosurgery, Inc. common stock that I have owned for at least six months if the
shares were acquired by me through exercise of an option, and that have a fair
market value (as determined in accordance with the Plan) as of this date equal
to the Purchase Price.&#160; I recognize that
other forms of payment may be permitted by the written approval of the
Administrator.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h1 style="font-size:10.0pt;margin:0in 0in .0001pt;page-break-after:auto;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.</font></b><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><i><font style="font-style:italic;">Representations</font></i></h1>

<h1 style="margin:0in 0in .0001pt;page-break-after:auto;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></h1>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.1.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Taxes.</font></i></b>&#160; The Company has made no warranties or
representations to me with respect to the income tax consequences of the
transactions contemplated by this Agreement and I am not relying on the Company
or its representatives for an assessment of such tax consequences.&#160; I have had adequate opportunity to consult
with my personal tax advisor prior to submitting this Agreement to the Company.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.2.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Repurchase.&#160; </font></i></b>If
the Shares are subject to a right of repurchase in favor of the Company at
their original purchase price when I cease to provide services for the Company,
or if I could be subject to suit under Section 16(b) of the Securities Exchange
Act of 1934 with respect to the purchase of the Shares, I will execute and
deliver to the Company a copy of the Acknowledgment and Statement of Decision
Regarding Election Pursuant to Section 83(b) of the Internal Revenue Code (the &#147;Acknowledgment&#148;)
attached as Exhibit A.&#160; I acknowledge
that I am primarily responsible for filing any Section 83(b) elections although
the Company will, as an accommodation to me and without assuming any liability,
file a duplicate election if I promptly provide an executed form with the
Acknowledgement and Statement of Decision Regarding Section 83(b).&#160; I will consult with my own tax advisor to
determine if there is a comparable election to file in the state of where I
reside and whether filing a federal or state Section 83(b) election is
desirable under my circumstances.</h2>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

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</font></div>

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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<h1 style="font-size:10.0pt;margin:0in 0in .0001pt;page-break-after:auto;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.</font></b><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><i><font style="font-style:italic;">Miscellaneous Provisions.</font></i></h1>

<h1 style="margin:0in 0in .0001pt;page-break-after:auto;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></h1>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.1.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Successors and Assigns.</font></i></b>&#160; Subject to the limitations set forth in this
Agreement, the benefits and obligations of this Agreement will be binding on
the executors, administrators, heirs, legal representatives, successors, and
assigns of the parties.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.2.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Costs.</font></i></b>&#160; I will repay the Company for all costs and
damages, including incidental and consequential damages and attorney&#146;s fees,
resulting from any transfer of the Shares which is not in compliance with the
provisions of this Agreement.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.3.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Governing Law.&#160;
</font></i></b>This Agreement shall be governed by, and construed in accordance
with, the laws of the State of Delaware excluding those laws that direct the
application of the laws of another jurisdiction.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.4.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Notices</font></i></b>.&#160; All notices and other communications under
this Agreement shall be in writing.&#160;
Unless and until I am notified in writing to the contrary, all notices,
communications, and documents directed to the Company and related to the
Agreement, if not delivered by hand, shall be mailed, addressed to:</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">MacroPore Biosurgery,
Inc.  <br>Attention:&#160; Sally B. Davis, Director of Human<br>
Resources and Administration</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">at the Company&#146;s published principal office location.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.5.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Communications.&#160;
</font></i></b>Unless and until I notify the Company in writing to the
contrary, all notices, communications, and documents intended for me and
related to this Agreement, if not delivered by hand, shall be mailed to my last
known address as shown on the Company&#146;s books.&#160;
Notices and communications shall be mailed by first class mail, postage
prepaid; documents shall be mailed by registered mail, return receipt
requested, postage prepaid.&#160; All mailings
and deliveries related to this Agreement shall be deemed received when actually
received, if by hand delivery, and three business days after mailing, if by
mail.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.6.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">Arbitration.&#160;
</font></i></b>All disputes arising out of this Agreement will be
finally settled by arbitration in accordance with the then existing rules of
the American Arbitration Association.&#160;
The arbitration will be conducted in the county of San Diego.&#160; Judgment upon the award rendered by the
arbitrators may be entered in any court having jurisdiction over it; provided
that nothing in this Agreement shall prevent a party from applying to a court
of competent jurisdiction to obtain temporary relief pending resolution of the
dispute through arbitration.&#160; The parties
agree that service of any notices in the course of such arbitration at their
respective addresses as provided for in this agreement shall be valid and
sufficient.</h2>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<h2 style="font-size:10.0pt;font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.7.</font><font size="1" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><b><i><font style="font-style:italic;font-weight:bold;">This is not an employment contract.&#160; </font></i></b>This Agreement is not to be
interpreted as a guarantee or contract of continuing employment.</h2>

<h2 style="font-weight:normal;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></h2>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">MACROPORE BIOSURGERY, INC.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.76%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.76%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="38%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:38.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.76%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">I hereby agree to be bound by all of the terms and
conditions of this Agreement and the Plan.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Purchaser&#146;s signature</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Printed name</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt 3.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The purchaser&#146;s spouse indicates by the execution of
this Agreement his or her consent to be bound by the terms herein as to his or
her interests, whether as community property or otherwise, if any, in the Shares
hereby purchased.</font></p>

<p style="margin:0in 0in .0001pt;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="55%" valign="top" style="padding:0in 0in 0in 0in;width:55.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:44.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Purchaser&#146;s Spouse</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

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