1. Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
2. Exploratory Research Center on Life and Living Systems, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
3. Department of Physics, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
4. Structural Biology Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan