1. Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo , Tokyo , Japan
2. Imaging Section, Okinawa Institute of Science and Technology (OIST) , Okinawa , Japan
3. Department of Cell Biology and Neuroscience, Juntendo University Graduate School of Medicine , Tokyo , Japan
4. Department of Anatomy, Division of Histology and Cell Biology, School of Medicine, Jichi Medical University , Tochigi , Japan
5. Division of Ultrastructural Research, National Institute for Physiological Sciences , Aichi , Japan
6. Department of Bioengineering, School of Engineering, The University of Tokyo , Tokyo , Japan