1. Departments of Obstetrics and Gynecology (T.H., C.L.), Yale University School of Medicine, New Haven, Connecticut 06520
2. Laboratory of Molecular Neurobiology (T.H.), Biological Research Center, Hungarian Academy of Sciences, H-6726 Szeged, Hungary
3. Center for Reproductive Sciences (N.J.M.), Columbia University Medical School, New York, New York 10032
4. Department of Neurobiology (C.L.), Yale University School of Medicine, New Haven, Connecticut 06520