1. a Department of Materials Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba 278, Japan, Research Institute for Biosciences, Science University of Tokyo, 2669 Yamazaki, Noda-shi, Chiba 278, Japan
2. b Department of Materials Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba 278, Japan
3. c Research Institute for Biosciences, Science University of Tokyo, 2669 Yamazaki, Noda-shi, Chiba 278, Japan
4. d Department of Biology, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-kit, Tokyo 112, Japan
5. e Department of Materials Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba 278, Japan, Research Institute for Biosciences, Science University of Tokyo, 2669 Yamazaki, Noda-shi, Chiba 278, Japan