1. Biomedical Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan
2. Structural Biology Research Center, Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Japan
3. Department of Virology, Institute of Tropical Medicine (NEKKEN) Nagasaki University Nagasaki Japan
4. Cellular and Molecular Biotechnology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan