1. Food Research Laboratories, Mitsui Norin Company, Ltd., and Central Research Laboratories, Tokyo Food Techno Company, Ltd., 223-1 Miyabara, Fujieda City, Shizuoka Prefecture 426-0133, Japan; and Department of Radiobiochemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Shizuoka Prefecture 422-8526, Japan%