1. Emergent Bioengineering Materials Research Team RIKEN Center for Emergent Matter Science 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
2. Nano Medical Engineering Laboratory RIKEN Cluster for Pioneering Research 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
3. Department of Environmental Chemistry and Engineering Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Midori‐ku Yokohama 226–8502 Japan
4. Support Unit for Bio‐Material Analysis Research Resources Division RIKEN Center for Brain Science 2‐1 Hirosawa Wako Saitama 351‐0198 Japan