1. Laboratory of Animal Physiology, Division of Bioscience, Nagahama Institute of Bio-Science and Technology, 1266 Tamura, Nagahama, Shiga 526-0829, Japan
2. School of Pharmaceutical Sciences, Faculty of Pharmacy, Ohu University, 31-1 Sankaku-do, Tomita-cho, Kohriyama, Fukushima 963-8611, Japan
3. Department of Pharmacology, Hamamatsu University School of Medicine, 1-20-1 Handa-yama, Higashi-ku, Hamamatsu, Shizuoka 431-3125, Japan