1. National Institute of Advanced Industrial Science and Technology, Miyagino-ku, Sendai 983-8551, Japan
2. School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, U.K.
3. Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
4. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan