0000950129-01-502473 S-3 5 20010810 LEXICON GENETICS INC/TX 0001062822 2835 760474169 1231 S-3 33 333-67294 1704656 4000 RESEARCH FOREST DRIVE 281-364-0100 THE WOODLANDS TX 77381 2813640100 4000 RESEARCH FOREST DR THE WOODLANDS TX 77381 S-3 1 h89691s-3.txt LEXICON GENETICS INCORPORATED EX-4.1 3 h89691ex4-1.txt AMENDED REGISTRATION RIGHTS AGREEMENT EX-4.2 4 h89691ex4-2.txt FORM OF STOCKHOLDER AGREEMENT EX-5.1 5 h89691ex5-1.txt OPINION OF VINSON & ELKINS L.L.P. EX-23.1 6 h89691ex23-1.txt CONSENT OF ARTHUR ANDERSEN LLP