1. Research Laboratory for Human Cell Engineering, Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
2. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
3. Taki Chemical Co. Ltd., Harima-cho, Japan
4. Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo, Japan