1. Pathology Department, Kashima Laboratory, Nonclinical Research Center, LSI Medience Corporation, 14-1 Sunayama, Kamisu, Ibaraki 314-0255, Japan
2. Pathology Department, Kumamoto Laboratory, Nonclinical Research Center, LSI Medicine Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan