0000950129-05-004736 10-Q 4 20050331 20050505 20050505 LEXICON GENETICS INC/TX 0001062822 2835 760474169 DE 1231 10-Q 34 000-30111 05804184 8800 TECHNOLOGY FOREST PLACE THE WOODLANDS TX 77381 2818633000 8800 TECHNOLOGY FOREST PLACE THE WOODLANDS TX 77381 10-Q 1 h25071e10vq.txt LEXICON GENETICS INC.- MARCH 31, 2005 EX-31.1 2 h25071exv31w1.txt CERTIFICATION OF CEO PURSUANT TO SECTION 302 EX-31.2 3 h25071exv31w2.txt CERTIFICATION OF CFO PURSUANT TO SECTION 302 EX-32.1 4 h25071exv32w1.txt CERTIFICATION OF CEO & CFO PURSUANT TO SECTION 906