1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto‐Daigaku Katsura Nishikyo‐Ku Kyoto 615‐8510 Japan
2. Department of Supramolecular Biology, Yokohama City University 1‐7‐29 Suehiro‐cho Tsurumi‐ku Yokohama 230‐0045 Japan
3. Department of Human Genome Research, Kazusa DNA Research Institute 2‐6‐7 Kazusa‐Kamatari Kisarazu Chiba 292‐0818 Japan