1. Laboratory of Neuroendocrinology (K.O., H.N., S.H.), Institute of Basic Medical Sciences, Ibaraki 305-8575, Japan
2. Laboratory of Behavioral Neuroendocrinology (M.C.T., S.O.), Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki 305-8575, Japan
3. Department of Biosciences and Nutrition (J.-Å.G.), Karolinska Institute, S-14186 Huddinge, Sweden
4. Laboratory of Reproductive and Developmental Toxicology (K.S.K.), National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
5. Laboratory of Functional Anatomy (T.H), Faculty of Agriculture, Meiji University, Kanagawa 214-71, Japan