1. Department of Food Science (Y.I., M.O., X.W., S.I.), The National Institute of Health and Nutrition, Tokyo 162, Japan
2. Department of Biochemistry (C.M., Y.O., T.Su.), School of Dentistry, Showa University, Tokyo 142, Japan
3. Department of Biochemistry (C.M.), School of Pharmacy, Tokyo University of Pharmacy and Life Science, Hachioji 192, Japan
4. Exploratory Research Laboratories III (T.Sa., Y.U.), Daiichi Pharmaceutical Company Ltd., Tokyo 134, Japan
5. Department of Radiology (M.I.), School of Medicine, Nagasaki University, Nagasaki 852, Japan