1. Division of Reproductive Biology Research (P.Y., Z.L., Y.-H.C., E.E.M., H.U., H.I., Q.X., S.R., J.I., J.J.K., E.X., S.E.B.), Department of Obstetrics and Gynecology, Feinberg School of Medicine at Northwestern University, Chicago, Illinois 60611
2. Department of Obstetrics, Gynecology, and Reproductive Sciences (S.T.), Yale University School of Medicine, New Haven, Connecticut 06520