1. From the Center for Human Nutrition (M.Y., B.D.K., J.Y., R.I.S., D.R., K.S., B.W.P., S.K.) and the Department of Surgery (J.C.E., S.R.E.), Washington University School of Medicine, St. Louis; and the Departments of Medicine (J.D.W., M.J.), Pharmacology (J.D.W., M.J.), Pediatrics (R.K.), and Computer Science and Engineering (R.K.), University of California San Diego, San Diego.