1. National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences (CAS), Beijing 100101, P.R. China.
2. School of Life Science, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China.
3. University of Chinese Academy of Sciences, Beijing 100049, P.R. China.
4. Center for Biological Imaging, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, P.R. China.