1. ETSII, University of Seville, Seville, Spain
2. Molecular Cryo Electron Microscopy Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Kunigami, Okinawa, Japan
3. Nucleic Acid Chemistry and Engineering Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Kunigami, Okinawa, Japan