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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001209191-03-012483.txt : 20030718
<SEC-HEADER>0001209191-03-012483.hdr.sgml : 20030718
<ACCEPTANCE-DATETIME>20030718162935
ACCESSION NUMBER:		0001209191-03-012483
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030710
FILED AS OF DATE:		20030718

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LEXICON GENETICS INC/TX
		CENTRAL INDEX KEY:			0001062822
		STANDARD INDUSTRIAL CLASSIFICATION:	IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES [2835]
		IRS NUMBER:				760474169
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		8800 TECHNOLOGY FOREST PLACE
		CITY:			THE WOODLANDS
		STATE:			TX
		ZIP:			77381
		BUSINESS PHONE:		2818633000

	MAIL ADDRESS:	
		STREET 1:		8800 TECHNOLOGY FOREST PLACE
		CITY:			THE WOODLANDS
		STATE:			TX
		ZIP:			77381

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MCNAIR ROBERT C
		CENTRAL INDEX KEY:			0001080723

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30111
		FILM NUMBER:		03793276

	BUSINESS ADDRESS:	
		STREET 1:		711 LOUISIANA STREET 33RD FLOOR
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
		BUSINESS PHONE:		7133367700

	MAIL ADDRESS:	
		STREET 1:		711 LOUISIANA STREET 33RD FLOOR
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>boh07527_boh1rcm.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>3</documentType><periodOfReport>2003-07-10</periodOfReport><noSecuritiesOwned>0</noSecuritiesOwned><issuer><issuerCik>0001062822</issuerCik><issuerName>LEXICON GENETICS INC/TX</issuerName>        <issuerTradingSymbol>LEXG</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001080723</rptOwnerCik><rptOwnerName>MCNAIR ROBERT C</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common stock, par value $0.001 per share</value></securityTitle><transactionAmounts><transac
tionShares><value>4250000</value></transactionShares></transactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By RCM Financial Services, L.P.</value><footnoteId id="F1" /></natureOfOwnership></ownershipNature></nonDerivativeSecurity><nonDerivativeSecurity><securityTitle><value>Common stock, par value $0.001 per share</value></securityTitle><transactionAmounts><transactionShares><value>20000</value></transactionShares></transactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Palmetto Partners, Ltd.</value><footnoteId id="F2" /></natureOfOwnership></ownershipNature></nonDerivativeSecurity><nonDerivativeSecurity><securityTitle><value>Common stock, par value $0.001 per share</value></securityTitle><transactionAmounts><transactionShares><value>1679400</value></transactionShares></transactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value>
</directOrIndirectOwnership><natureOfOwnership><value>By Cogene Biotech Ventures, L.P.</value><footnoteId id="F3" /></natureOfOwnership></ownershipNature></nonDerivativeSecurity><footnotes><footnote id="F1">The reporting person is the sole limited partner of RCM Financial Services, L.P., and the sole director and stockholder of RCM Financial Services GP, Inc., which serves as the sole general partner of RCM Financial Services, L.P.</footnote><footnote id="F2">The reporting person is the sole limited partner of Palmetto Partners, Ltd., and the sole director and stockholder of Palmetto Capital Corporation, which serves as the sole general partner of Palmetto Partners, Ltd.</footnote><footnote id="F3">Palmetto Partners, Ltd. owns a 74% limited partner interest in Cogene Biotech Ventures, L.P.  Palmetto Partners, Ltd. is the sole member of Cogene Biotech Ventures GP, L.L.C., which serves as the sole general partner of Cogene Biotech Ventures, L.P. The reporting person disclaims beneficial ownership of the securi
ties held by Cogene Biotech Ventures, L.P., except to the extent of his pecuniary interest therein.</footnote></footnotes><ownerSignature><signatureName> Robert C. McNair</signatureName><signatureDate>2003-07-18</signatureDate></ownerSignature></ownershipDocument>

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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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