1. Graduate School of Agriculture, Kyoto University, Oiwake-cho, Kitashirakawa, Kyoto 606-8502, Japan
2. Research Institute for Health Fundamentals, Ajinomoto Company Inc., 1-1 Suzuki-cho, Kawasaki-ku, Kawasaki 210-8681, Japan
3. School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan