1. Division of Endocrinology (Y.L., C.W., A.P.S.H., C.-M.N., A.L., R.S.S.), Department of Medicine, Harbor-University of California, Los Angeles Medical Center and Los Angeles Biomedical Research Institute at Harbor-University of California, Los Angeles Medical Center, Torrance, California 90502
2. State Key Laboratory of Reproductive Biology (Y.-X.L., X.-S.Z., Z.-Y.H., Y.-C.L.), Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China