Affiliation: | 1Invitrogen Corp, 501 Charmany Dr, 53719 Madison, WI ;2Quintessence Biosciences, 53719 Madison, WI ;3Puracyp Inc, 1989 Palomar Oaks Way, Suite B, 92009 Carlsbad, CA ;4California Toxicology Research Institute, 1989 Palomar Oaks Way, Suite B, 92009 Carlsbad, CA |