1. Departments of Pharmacology (Y.I., K.-i.Y., F.U.), Asahikawa Medical University, Hokkaido 078–8510, Japan;
2. Departments of Biochemistry (Y.I., K.Mi.), University of Fukui, Fukui 910–1193, Japan;
3. Obstetrics and Gynecology (M.O.), Faculty of Medical Sciences, University of Fukui, Fukui 910–1193, Japan;
4. Department of Materials and Life Science (T.K.), Graduate School of Science and Technology, Kumamoto University, Kumamoto 860–8555, Japan;
5. Department of Biochemistry and Medical Education Center (K.Mu.), Keio University School of Medicine, Tokyo 160–8582, Japan;
6. Biochemistry (T.T., T.Y.), Asahikawa Medical University, Hokkaido 078–8510, Japan;
7. Department of Reproduction (A.U.), National Research Institute for Child Health and Development, Tokyo 157–8535, Japan