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We are grateful to Shuoguo Li (Center for Biological Imaging, Institute of Biophysics Chinese Academy of Sciences), for her assistance in 3D-SIM imaging. This work was supported by the Collaborative Innovation Center of Suzhou Nano Science and Technology, the Major program of the Development Foundation of the Hefei Center for Physical Science and Technology, the National Natural Science Foundation of China (Grants 21175122, 21375121, 31171358, and 31371429), National Basic Key Research Program of China (2014CB910604), and Anhui Provincial Natural Science Foundation (Grant 1508085JGD06).
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