1. Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 4-2-1, Takarazuka, Hyogo 665-8555, Japan
2. Bioscience Research Laboratory, Sumitomo Chemical Co., Ltd., 3-1-98, Kasugade-naka 3-chome, Konohana-ku, Osaka-city, Osaka 554-8558, Japan