1. Institute for Advanced Biosciences Keio University 246‐2 Mizukami, Kakuganji Tsuruoka Yamagata 997‐0052 Japan
2. Intestinal Microbiota Project Kanagawa Institute of Industrial Science and Technology 3‐25‐13 Tonomachi, Kawasaki‐ku Kawasaki Kanagawa 210‐0821 Japan
3. Transborder Medical Research Center University of Tsukuba 1‐1‐1 Tennodai Tsukuba Ibaraki 305‐8575 Japan
4. PRESTO Japan Science and Technology Agency 4‐1‐8 Honcho Kawaguchi Saitama 332‐0012 Japan