1. Department of Pharmacology, Kyoto University Faculty of Medicine, Sakyo-ku, Kyoto 606-8501, Japan
2. Department of Obstetrics and Gynecology, Shiga University of Medical Science, Ohtsu, Shiga 520-2191, Japan
3. Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, NJ 08855