0000950129-03-005407 10-Q 4 20030930 20031106 LEXICON GENETICS INC/TX 0001062822 2835 760474169 DE 1231 10-Q 34 000-30111 03982652 8800 TECHNOLOGY FOREST PLACE THE WOODLANDS TX 77381 2818633000 8800 TECHNOLOGY FOREST PLACE THE WOODLANDS TX 77381 10-Q 1 h10257e10vq.txt LEXICON GENETICS INC.- SEPTEMBER 30, 2003 EX-31.1 3 h10257exv31w1.txt CERTIFICATION OF CEO PURSUANT TO SECTION 302 EX-31.2 4 h10257exv31w2.txt CERTIFICATION OF CFO PURSUANT TO SECTION 302 EX-32.1 5 h10257exv32w1.txt CERTIFICATION OF CEO & CFO PURSUANT TO SECTION 906