Affiliation: | 1. Molecular and System Life Science Unit, RIKEN Advanced Science Institute, Hirosawa 2‐1, Wako, Saitama 351‐0198 Japan;2. Research Institute for Electronic Science, Hokkaido University, Kita 20, Nishi 10, Kita‐ku, Sapporo, Hokkaido 001‐0020 Japan |