1. Laboratory Animal Science Div., Astellas Research Technologies Co., Ltd., 1–6, Kashima 2-chome, Yodogawa-ku, Osaka 532–8514, Japan
2. Laboratory Animal Science Div., Astellas Research Technologies Co., Ltd., 21, Miyukigaoka, Tsukuba, Ibaraki 305–8585, Japan
3. Drug Safety Research Labs., Astellas Pharma Inc., 1–6, Kashima 2-chome, Yodogawa-ku, Osaka 532–8514, Japan