1. United States Department of Agriculture/Agricultural Research Service Children’s Nutrition Research Center (J.A.B., P.M.J.O’C., A.S., R.A.O., H.V.N., T.A.D.), Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030;
2. Department of Cellular and Molecular Physiology (S.R.K., L.S.J.), Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033