1. Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University, N13W8, Kitaku, Sapporo, 060-8628, Japan
2. Japan Science and Technology Agency, CREST, 4-1-8, Honcho Kawaguchi, Saitama
332-0012, Japan
3. Science of Polymeric Materials, Graduate School of Agricultural
and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan