1. Research Institute for Electronic Science Hokkaido University N12‐W7, Kita‐ku Sapporo Hokkaido 060‐0812 Japan
2. Division of Life Science Graduate School of Life ScienceHokkaido UniversityN10‐W8, Kita‐ku Sapporo Hokkaido 060‐0810 Japan
3. Transdisciplinary Life Science Course Faculty of Advanced Life Science Hokkaido University N10‐W8, Kita‐ku Sapporo Hokkaido 060‐0810 Japan