1. Key Laboratory of Protein and Peptide Pharmaceuticals, CAS-University of Tokyo Joint Laboratory of Structural Virology and Immunology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
2. Key Laboratory of Molecular Imaging of Chinese Academy of Sciences, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China
3. University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
4. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, U.K.