EX-32.1 4 h40856exv32w1.htm CERTIFICATION OF CEO & CFO PURSUANT TO SECTION 906 exv32w1
 

Exhibit 32.1
CERTIFICATION
     Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. 1350, as adopted), Arthur T. Sands, M.D., Ph.D., Chief Executive Officer of Lexicon Genetics Incorporated (“Lexicon”), and Julia P. Gregory, Chief Financial Officer of Lexicon, each hereby certify that:
  1.   Lexicon’s Quarterly Report on Form 10-Q for the period ended September 30, 2006, and to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of section 13(a) or section 15(d) of the Securities Exchange Act of 1934, and
 
  2.   The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of Lexicon.
     IN WITNESS WHEREOF, the undersigned have set their hands hereto as of the 3rd day of November, 2006.
             
 
           
 
  By:   /s/ Arthur T. Sands    
 
           
 
      Arthur T. Sands, M.D., Ph.D.    
 
      President and Chief Executive Officer    
 
            
 
  By:   /s/ Julia P. Gregory    
 
           
 
      Julia P. Gregory    
 
      Executive Vice President,    
 
      Corporate Development and    
 
      Chief Financial Officer