1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
2. Rheocrysta R&D Group Life Sciences R&D Department, R&D Headquarters, DKS Co. Ltd., 5 Ogawara-cho, Kisshoin, Minami-ku, Kyoto 601-8391, Japan
3. Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan