0000950129-02-005958 S-3 2 20021127 LEXICON GENETICS INC/TX 0001062822 2835 760474169 1231 S-3 33 333-101549 02843809 4000 RESEARCH FOREST DRIVE 281-364-0100 THE WOODLANDS TX 77381 2813640100 4000 RESEARCH FOREST DR THE WOODLANDS TX 77381 S-3 1 h01653sv3.txt LEXICON GENETICS INCORPORATED EX-5.1 3 h01653exv5w1.txt OPINION OF VINSON & ELKINS L.L.P.