1. National Key Research Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, P.R. China
2. Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Peking University, Beijing 100191, P.R. China
3. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P.R. China