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<SEC-DOCUMENT>0001169232-05-003161.txt : 20050614
<SEC-HEADER>0001169232-05-003161.hdr.sgml : 20050613
<ACCEPTANCE-DATETIME>20050614152853
ACCESSION NUMBER:		0001169232-05-003161
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20050425
FILED AS OF DATE:		20050614
DATE AS OF CHANGE:		20050614

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AEROGEN INC
		CENTRAL INDEX KEY:			0001039160
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				330488580
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2071 STIERLIN COURT
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94043
		BUSINESS PHONE:		650 864-7300

	MAIL ADDRESS:	
		STREET 1:		2071 STIERLIN COURT
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94043

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PROMED OFFSHORE FUND II, LTD
		CENTRAL INDEX KEY:			0001328780

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894776

	BUSINESS ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140
		BUSINESS PHONE:		617-441-8800

	MAIL ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PROMED OFFSHORE FUND, LTD
		CENTRAL INDEX KEY:			0001328779

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894777

	BUSINESS ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140
		BUSINESS PHONE:		617-441-8800

	MAIL ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PROMED MANAGEMENT INC
		CENTRAL INDEX KEY:			0001101088
		STATE OF INCORPORATION:			MA

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894778

	BUSINESS ADDRESS:	
		STREET 1:		C/O MUSKET RESEARCH ASSOCIATES INC
		STREET 2:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140

	FORMER NAME:	
		FORMER CONFORMED NAME:	PROMED MANAGEMENT L L C
		DATE OF NAME CHANGE:	19991215

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PROMED PARTNERS II LP
		CENTRAL INDEX KEY:			0001144358

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894779

	BUSINESS ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140
		BUSINESS PHONE:		6174418800

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PROMED PARTNERS L P
		CENTRAL INDEX KEY:			0001011552

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894780

	BUSINESS ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DR
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02104
		BUSINESS PHONE:		6174418800

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PROMED ASSET MANAGEMENT, LLC
		CENTRAL INDEX KEY:			0001328778

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894781

	BUSINESS ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140
		BUSINESS PHONE:		617-441-8800

	MAIL ADDRESS:	
		STREET 1:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KUROKAWA BARRY
		CENTRAL INDEX KEY:			0001329753

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894782

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		617-441-8800

	MAIL ADDRESS:	
		STREET 1:		C/O PROMED PARTNERS, L.P.
		STREET 2:		125 CAMBRIDGEPARK DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02140

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Musket David B
		CENTRAL INDEX KEY:			0001310611

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31913
		FILM NUMBER:		05894783

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(650) 614-4100

	MAIL ADDRESS:	
		STREET 1:		C/O CONOR MEDSYSTEMS, INC.
		STREET 2:		1003 HAMILTON COURT
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>d05-64246_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-04-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001039160</issuerCik>
        <issuerName>AEROGEN INC</issuerName>
        <issuerTradingSymbol>AEGN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001310611</rptOwnerCik>
            <rptOwnerName>Musket David B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02140</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001329753</rptOwnerCik>
            <rptOwnerName>KUROKAWA BARRY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PROMED PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>125 CAMBRIDGEPARK DRIVE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02140</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001328778</rptOwnerCik>
            <rptOwnerName>PROMED ASSET MANAGEMENT, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02140</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001011552</rptOwnerCik>
            <rptOwnerName>PROMED PARTNERS L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001144358</rptOwnerCik>
            <rptOwnerName>PROMED PARTNERS II LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001101088</rptOwnerCik>
            <rptOwnerName>PROMED MANAGEMENT INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001328779</rptOwnerCik>
            <rptOwnerName>PROMED OFFSHORE FUND, LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>125 CAMBRIDGEPARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02140</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <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>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-04-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>35000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.9879</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>826972</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reported purchase of 25,000 shares of the Issuer was made on behalf of the account of ProMed Offshore II Fund, Ltd., a
private investment fund (which as of the date of this Form 4, owns 58,000 shares of the Issuer), the Investment Manager of
which is ProMed Management, Inc. (&quot;ProMed Management&quot;). ProMed Management is controlled by David B. Musket and Barry
Kurokawa. The remainder of the reported amount of securities beneficially owned following the reported transaction may be
deemed to be beneficially owned as follows: (A) 455,480 shares of the Issuer owned by and held in the account of ProMed
Partners, L.P., whose general partner is ProMed Asset Management, L.L.C. (&quot;ProMed Asset Management&quot;), which is controlled by
David B. Musket and Barry Kurokawa; See foot note 2.</footnote>
        <footnote id="F2">(B) 83,986 shares of the Issuer owned by and held in the account of ProMed Partners II, L.P., whose general
partner is also ProMed Asset Management; (C) 73,564 shares of the Issuer owned by and held in the account of ProMed Offshore
Fund, Ltd., whose investment manager is ProMed Management; (D) 120,942 shares of the Issuer owned directly by David B.
Musket; and (E) 1,533 shares of the Issuer owned directly by Barry Kurokawa. 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>
    </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>d64246_ex99.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>April 25, 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>April 25, 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>April 25, 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>April 25, 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>April 25, 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>

<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 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>


<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></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></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>April 25, 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="428" 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="228" valign=top >
             <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>
         <td  width="104">
            <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/ 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>

<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>

<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 Offshore Fund II, 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>


<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>April 25, 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="428" 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;&nbsp;Signature:</font></p> </td>
         <td width="252" valign=top >
             <p style='margin-left:0pt;text-indent:0pt;text-align:left;margin-top:0pt;margin-bottom:0pt'><font size=2>ProMed Offshore Fund II, Ltd.</font></p>

</td>
         <td  width="80">
            <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/ 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;&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;'><font size=2>&nbsp;</font></p>
<HR noshade align="center" width="100%" size="2">

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