1. RIKEN Center for Biosystems Dynamics Research, Laboratory for Comprehensive Bioimaging, Kobe, Hyogo 650-0047, Japan
2. Department of Stem Cell Biology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Hiroshima 734-8553, Japan
3. Radioisotope Research Center, Division of biochemical engineering, Kyoto University, Kyoto, Kyoto 606-8501, Japan
4. Department of Physics, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
5. Institute for Protein Research, Laboratory of Nanobiology, Osaka University, Suita, Osaka 565-0871, Japan