1. Laboratory of Reproductive Endocrinology (N.N., I.K., Y.F., T.K., Y.T., T.M., M.S.), Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-8528, Japan;
2. Department of Molecular and Cellular Biology (I.K., H.-Y.F., J.S.R.), Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030