1. Department of College of Medicine (O.D.S.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801;
2. Department of Molecular and Integrative Physiology (O.D.S., S.Z., H.R.L.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801;
3. Department of Obstetrics and Gynecology, Washington University School of Medicine (L.M.O.), St. Louis, Missouri 63110