1. From the National Institute of Health and Nutrition, Tokyo, Japan (HO and SS); the Division of Environmental Immunology and Toxicology, Department of Health Science, Jichi Medical School, Tochigi, Japan (HH, KM, YH, and FK); the Core Research for Evolutional Science and Technology, Japan Science Technology Agency, Honmachi, Kawaguchi, Japan (HH, EO, and FK); and the Cancer Prevention & Early Dete