1. Biotechnology GroupTokyo Metropolitan Industrial Technology Research Institute 2‐4‐10, Aomi, Koto‐ku Tokyo 135‐0064 Japan
2. Department of Frontier Fiber Technology and SciencesGraduate School of Engineering, University of Fukui 3‐9‐1, Bunkyo Fukui 910‐8507 Japan
3. Life Science Innovation CenterUniversity of Fukui 3‐9‐1, Bunkyo Fukui 910‐8507 Japan
4. Department of Gastroenterology and HepatologyTokyo Medical University 6‐7‐1, Nishishinjuku, Shinjuku‐ku Tokyo 160‐0023 Japan