0000950129-05-000501 S-3 5 20050121 20050121 LEXICON GENETICS INC/TX 0001062822 2835 760474169 DE 1231 S-3 33 333-122214 05541962 8800 TECHNOLOGY FOREST PLACE THE WOODLANDS TX 77381 2818633000 8800 TECHNOLOGY FOREST PLACE THE WOODLANDS TX 77381 S-3 1 h21867sv3.txt LEXICON GENETICS INCORPORATED EX-4.3 2 h21867exv4w3.txt FORM OF INDENTURE EX-5.1 3 h21867exv5w1.txt OPINION OF VINSON & ELKINS L.L.P. EX-12.1 4 h21867exv12w1.txt COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES EX-23.1 5 h21867exv23w1.txt CONSENT OF ERNST & YOUNG LLP