1. Department of Physiology (N.A.R., A.R.-M., J.L., S.V., J.K., I.H.), University of Turku, 20520 Turku, Finland
2. Program for Developmental and Reproductive Biology, Biomedicum Helsinki and Children’s Hospital (S.K., M.H.), University of Helsinki, 00029 Helsinki, Finland
3. Departments of Pediatrics (D.B.W., M.H.), St. Louis, Missouri 63110
4. Pharmacology (D.B.W.), Washington University, St. Louis, Missouri 63110
5. Institute of Reproductive and Developmental Biology (I.H.), Imperial College London, Faculty of Medicine, London W12 0NN, United Kingdom