1. From the Center for Perinatal Biology (K.C., D.X., X.H., Z.X., L.D.L., L.Z.), Department of Physiology and Pharmacology, Loma Linda University School of Medicine, Loma Linda, Calif; First Hospital of Soochow University (Z.X.), Suzhou, China; Department of Chemistry and Biochemistry (S.Y.), California State University, San Bernardino, Calif.