1. Nano Medical Engineering
Laboratory, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
2. Emergent Bioengineering
Materials Research Team, RIKEN Center for Emergent Matter Science, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
3. Division
of Material Science, Graduate School of Science and Technology, Saitama University, 255 Shimo-Ohkubo, Sakura-ku, Saitama 338-8570, Japan
4. Faculty
of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
5. PRESTO, Japan Science
and Technology Agency, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan