1. Food Science and Technology Institute, Morinaga Milk Industry Co., Ltd., 5-1-83, Higashihara, 252-8583 Kanagawa, Japan
2. Kanagawa Academy of Science and Technology, 3-2-1 Sakado, Takatsu-ku, 213-0012 Kanagawa, Japan
3. Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyoku, 113-8657 Tokyo, Japan