Jianshi Jin1, Tengfei Lian2, X Sunney Xie3, Xiao-Dong Su4. 1. Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China. 2. Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China. 3. Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China Department of Chemistry & Chemical Biology, Harvard University, Cambridge, MA 02138, USA. 4. Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China xdsu@pku.edu.cn.