1. Drug Safety Research Labs., Astellas Pharma Inc., 21 Miyukigaoka, Tsukuba-shi, Ibaraki, 305-8585, Japan
2. Laboratory of Veterinary Pathology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Rinku Ourai Kita 1-58 Izumisano-shi, Osaka 598-8531, Japan