<SUBMISSION>
<ACCESSION-NUMBER>0001169232-05-003158
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20050303
<FILING-DATE>20050614
<DATE-OF-FILING-DATE-CHANGE>20050614
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>AEROGEN INC
<CIK>0001039160
<ASSIGNED-SIC>3841
<IRS-NUMBER>330488580
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>2071 STIERLIN COURT
<CITY>MOUNTAIN VIEW
<STATE>CA
<ZIP>94043
<PHONE>650 864-7300
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>2071 STIERLIN COURT
<CITY>MOUNTAIN VIEW
<STATE>CA
<ZIP>94043
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>PROMED OFFSHORE FUND II, LTD
<CIK>0001328780
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-31913
<FILM-NUMBER>05894681
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
<PHONE>617-441-8800
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
</MAIL-ADDRESS>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
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<BUSINESS-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
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<STATE>MA
<ZIP>02140
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</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
</MAIL-ADDRESS>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>PROMED MANAGEMENT INC
<CIK>0001101088
<STATE-OF-INCORPORATION>MA
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-31913
<FILM-NUMBER>05894683
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>C/O MUSKET RESEARCH ASSOCIATES INC
<STREET2>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
</BUSINESS-ADDRESS>
<FORMER-NAME>
<FORMER-CONFORMED-NAME>PROMED MANAGEMENT L L C
<DATE-CHANGED>19991215
</FORMER-NAME>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>PROMED PARTNERS II LP
<CIK>0001144358
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<FILING-VALUES>
<FORM-TYPE>3
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<FILM-NUMBER>05894684
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<BUSINESS-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
<PHONE>6174418800
</BUSINESS-ADDRESS>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>PROMED PARTNERS L P
<CIK>0001011552
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-31913
<FILM-NUMBER>05894685
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<BUSINESS-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DR
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02104
<PHONE>6174418800
</BUSINESS-ADDRESS>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>PROMED ASSET MANAGEMENT, LLC
<CIK>0001328778
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<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-31913
<FILM-NUMBER>05894686
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<BUSINESS-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
<PHONE>617-441-8800
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
</MAIL-ADDRESS>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>KUROKAWA BARRY
<CIK>0001329753
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-31913
<FILM-NUMBER>05894687
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>617-441-8800
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>C/O PROMED PARTNERS, L.P.
<STREET2>125 CAMBRIDGEPARK DRIVE
<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02140
</MAIL-ADDRESS>
</REPORTING-OWNER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Musket David B
<CIK>0001310611
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-31913
<FILM-NUMBER>05894688
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>(650) 614-4100
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>C/O CONOR MEDSYSTEMS, INC.
<STREET2>1003 HAMILTON COURT
<CITY>MENLO PARK
<STATE>CA
<ZIP>94025
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>d05-64243_ex.xml
<TEXT>
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<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

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    <periodOfReport>2005-03-03</periodOfReport>

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    <issuer>
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        <issuerName>AEROGEN INC</issuerName>
        <issuerTradingSymbol>AEGN</issuerTradingSymbol>
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            <rptOwnerName>Musket David B</rptOwnerName>
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    <reportingOwner>
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        <reportingOwnerAddress>
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        <reportingOwnerRelationship>
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            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
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    <reportingOwner>
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            <rptOwnerName>PROMED ASSET MANAGEMENT, LLC</rptOwnerName>
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        <reportingOwnerAddress>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001011552</rptOwnerCik>
            <rptOwnerName>PROMED PARTNERS L P</rptOwnerName>
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        <reportingOwnerAddress>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02104</rptOwnerZipCode>
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    <reportingOwner>
        <reportingOwnerId>
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            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
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            <isOther>1</isOther>
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    <reportingOwner>
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            <rptOwnerCik>0001101088</rptOwnerCik>
            <rptOwnerName>PROMED MANAGEMENT INC</rptOwnerName>
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        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001328779</rptOwnerCik>
            <rptOwnerName>PROMED OFFSHORE FUND, LTD</rptOwnerName>
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        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02140</rptOwnerZipCode>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001328780</rptOwnerCik>
            <rptOwnerName>PROMED OFFSHORE FUND II, LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02140</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
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    <nonDerivativeTable>
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            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>120942</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>539466</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>455480</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
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        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>83986</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>73564</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>73564</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These securities may be deemed to be beneficially owned by ProMed Asset Management, L.L.C. (&quot;ProMed Asset Management&quot;), the
general partner of ProMed Partners, L.P. (&quot;ProMed I&quot;) and ProMed Partners II, L.P. (&quot;ProMed II&quot;), and may also be deemed to
be beneficially owned by David B. Musket and Barry Kurokawa, the managing members of ProMed Asset Management. These
securities are owned by and are held in the accounts of ProMed I and ProMed II. Mr. Kurokawa also directly owns 1,533
shares of the Issuer. Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent
of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the
beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any
other purpose.</footnote>
        <footnote id="F2">These securities are owned by and are held in the account of ProMed I.</footnote>
        <footnote id="F3">These securities are owned by and are held in the account of ProMed II.</footnote>
        <footnote id="F4">These securities may be deemed to be beneficially owned by ProMed Management, Inc. (&quot;ProMed Management&quot;), the investment
manager of ProMed Offshore Fund, Ltd. (&quot;ProMed Offshore I&quot;). ProMed Management is controlled by David B. Musket and Barry
Kurokawa. These securities are owned by and are held in the account of ProMed Offshore I. Each Reporting Person disclaims
beneficial ownership of the reported securities except to the extent of his or its pecuniary interest therein, and this
report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of
Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.</footnote>
        <footnote id="F5">These securities are owned by and are held in the account of ProMed Offshore I.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>David B. Musket</signatureName>
        <signatureDate>2005-05-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
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<DOCUMENT>
<TYPE>EX-99
<SEQUENCE>2
<FILENAME>d64243_ex1.htm
<DESCRIPTION>JOINT FILING INFORMATION
<TEXT>
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<!-- MARKER FORMAT-SHEET="Head Right-TNR" FSL="Workstation" -->
<P ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit 99 </FONT></P>

        <p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;&nbsp;<u><b><font size=2>Joint Filing Information</font></b></u></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Name: Barry Kurokawa</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="620" style=' border-collapse:collapse'>
      <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Address: </font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>125 Cambridgepark Drive</font></p> </td>

</tr>
     <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Cambridge, MA 02140</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Designated Filer: David B. Musket</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="450" style=' border-collapse:collapse'>
      <tr>
         <td width="307" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Issuer and Ticker Symbol:

Aerogen&nbsp;Inc.</font></p> </td>
         <td width="75" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font SIZE=2>AEGN</font></p> </td> </tr>
     <tr>
         <td width="307" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="109" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td> </tr>
     <tr>
         <td width="95" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Date of Event Requiring Filing:</font></p>

</td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>March 3, 2005</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="292" style=' border-collapse:collapse'>
      <tr >
         <td width="96" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;&nbsp;Signature:</font></p> </td>
         <td width="132" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Barry Kurokawa</font></p> </td>
         <td  width="64">
            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></td> </tr>
     <tr >
         <td  width="96">
            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></td>
         <td  colspan="2" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>By:  /s/Barry Kurokawa</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Date: May 19, 2005</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>
</p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<br>


<HR noshade align="center" width="100%" size="2">
<p style='page-break-before:always'></p>


<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;<u><b>Joint Filing
Information</b></u> </FONT></P>


<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Name: ProMed Asset Management, L.L.C.</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="600" style=' border-collapse:collapse'>
      <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Address: </font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>125 Cambridgepark Drive</font></p> </td>

</tr>
     <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Cambridge, MA 02140</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt; margin-left:0.75in;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Designated Filer: David B. Musket</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="400" style=' border-collapse:collapse'>
      <tr>
        <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Issuer and Ticker Symbol: Aerogen

Inc.</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font SIZE=2>AEGN</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;Date of Event Requiring Filing:</font></p>

</td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>March 3, 2005</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="364" style=' border-collapse:collapse'>
      <tr>
         <td width="96" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;&nbsp;Signature:</font></p> </td>
         <td width="268" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>ProMed Asset Management,

L.L.C.</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="196" style=' margin-left:1.0in;border-collapse:collapse'>
      <tr>
         <td width="196" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>By: /s/David B. Musket</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Date: May 19, 2005</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>
</p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<br>
<HR noshade align="center" width="100%" size="2">
<p style='page-break-before:always'></p>



<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;&nbsp;<u><b><font size=2>Joint Filing Information</font></b></u></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Name: ProMed Partners, L.P.</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="600" style=' border-collapse:collapse'>
      <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Address: </font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>125 Cambridgepark Drive</font></p> </td>

</tr>
     <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Cambridge, MA 02140</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Designated Filer: David B. Musket</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="400" style=' border-collapse:collapse'>
      <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Issuer and Ticker Symbol: Aerogen

Inc.</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font SIZE=2>AEGN</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Date of Event Requiring Filing:</font></p>

</td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>March 3, 2005</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="284" style=' border-collapse:collapse'>
      <tr>
         <td width="96" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;&nbsp;Signature:</font></p> </td>
         <td width="188" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>ProMed Partners, L.P.</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:1in;text-align:left;'><font size=2>By: ProMed Asset Management, L.L.C., its general

partner</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="204" style=' margin-left:1.0in;border-collapse:collapse'>
      <tr>
         <td width="204" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>By: /s/ David B. Musket</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Date: May 19, 2005</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>
</p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<br>
<HR noshade align="center" width="100%" size="2">
<p style='page-break-before:always'></p>



<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;&nbsp;<u><b><font size=2>Joint Filing Information</font></b></u></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Name: ProMed Partners II, L.P.</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="600" style=' border-collapse:collapse'>
      <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Address: </font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>125 Cambridgepark Drive</font></p> </td>

</tr>
     <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Cambridge, MA 02140</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Designated Filer: David B. Musket</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="400" style=' border-collapse:collapse'>
      <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Issuer and Ticker Symbol: Aerogen

Inc.</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font SIZE=2>AEGN</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Date of Event Requiring Filing:</font></p>

</td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>March 3, 2005</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="308" style=' border-collapse:collapse'>
      <tr>
         <td width="96" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;&nbsp;Signature:</font></p> </td>
         <td width="212" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>ProMed Partners II, L.P.</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt; text-indent:1in;text-align:left;'><font size=2>By: ProMed Asset Management, L.L.C., its general

partner</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="204" style=' margin-left:1.0in;border-collapse:collapse'>
      <tr>
         <td width="204" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>By: /s/ David B. Musket</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Date: May 19, 2005</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>
</p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<br>
<HR noshade align="center" width="100%" size="2">
<p style='page-break-before:always'></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;&nbsp;<u><b><font size=2>Joint Filing Information</font></b></u></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Name: ProMed Management, Inc.</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="600" style=' border-collapse:collapse'>
      <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Address: </font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>125 Cambridgepark Drive</font></p> </td>

</tr>
     <tr>
         <td width="63" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="575" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Cambridge, MA 02140</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Designated Filer: David B. Musket</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="400" style=' border-collapse:collapse'>
      <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Issuer and Ticker Symbol: Aerogen

Inc.</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font SIZE=2>AEGN</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></p> </td> </tr>
     <tr>
         <td width="327" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;Date of Event Requiring Filing:</font></p>

</td>
         <td width="189" valign=top style='padding:0in 5.4pt 0in 5.4pt'>
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>March 3, 2005</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


<table border="0" cellspacing=0 cellpadding=0 width="300" style=' border-collapse:collapse'>
      <tr>
         <td width="96" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;&nbsp;Signature:</font></p> </td>
         <td width="204" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>ProMed Management, Inc.</font></p> </td>

</tr>
     <tr >
         <td  width="96">
            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></td>
         <td width="204" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>By: /s/ David B. Musket</font></p> </td>

</tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Date: May 19, 2005</font></p>


<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>
</p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>
<br>
<HR noshade align="center" width="100%" size="2">
<p style='page-break-before:always'></p>
<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'>&nbsp;&nbsp;<u><b><font size=2>Joint Filing Information</font></b></u></p>

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<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Name: ProMed Offshore Fund, Ltd.</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Address: [TO BE INSERTED]</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Designated Filer: David B. Musket</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>


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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Issuer and Ticker Symbol: Aerogen

Inc.</font></p> </td>
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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font SIZE=2>AEGN</font></p> </td> </tr>
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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1></font></p> </td> </tr>
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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>Date of Event Requiring Filing:</font></p>
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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>March 3, 2005</font></p> </td> </tr></table>

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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>&nbsp;&nbsp;Signature:</font></p> </td>
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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>ProMed Offshore Fund, Ltd.</font></p> </td>
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            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></td> </tr>
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            <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=1>&nbsp;</font></td>
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             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>By: /s/ David B. Musket, its

[Director]</font></p> </td> </tr></table>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;</font></p>

<p style=' margin-bottom:0pt; margin-top:0pt;text-align:left;'><font size=2>&nbsp;&nbsp;Date: May 19, 2005</font></p>

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