1. School of Medicine Shanghai Jiao Tong University Institute of Molecular Medicine and Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine State Key Laboratory of Oncogenes and Related Genes, Renji Hospital 1630 Dongfang Road, B17-1820, Pudong Shanghai 200127 P.R. China
2. National Center for Nanoscience and Technology Chinese Academy of Sciences No. 11 ZhongGuanCun BeiYiTiao Beijing 100190 P.R. China
3. Department of Integrative Structural and Computational Biology The Scripps Research Institute La Jolla CA 92037 USA