1. National Laboratory of Biomacromolecules; Institute of Biophysics; Chinese Academy of Sciences; Beijing 100101 China
2. University of Chinese Academy of Sciences; Beijing 100049 China
3. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety; National Center for Nanoscience and Technology; Beijing 100190 China
4. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety; Institute of High Energy Physics; Chinese Academy of Sciences; Beijing 100049 China
5. Department of Pharmacology; Creighton University School of Medicine; Omaha NE 68178 USA