1. National Engineering Research Center for Biomaterials, Sichuan University, 610064 Chengdu, China
2. Peter Gruenberg Institute (PGI-8), Research Center Juelich, 52425 Juelich, Germany
3. State key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050 Shanghai, China
4. Institute of Complex Systems (ICS-6), Research Center Juelich, 52425 Juelich, Germany
5. Central Division of Analytical Chemistry (ZCH), Research Center Juelich, 52425 Juelich, Germany
6. Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
7. Central Facility for Electron Microscopy and Institute of Crystallography, RWTH Aachen University, 52074 Aachen, Germany