1. Watarase Research Center, Discovery Research Headquarters, Kyorin Pharmaceutical Co. Ltd., 1848 Nogi, Shimotsuga-gun, Tochigi 329-0114, Japan
2. School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
3. Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan