1. Research Institute, Kagome Company, Ltd., 17 Nasushiobara-shi, Tochigi 329-2762, Japan
2. Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
3. Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki-shi, Osaka 569-1094, Japan