1 State Key Laboratory of Membrane Biology, Peking-Tsinghua Joint Center for Life Sciences, School of Life Sciences, Peking University, 100871, Beijing, China.
2 Changping Laboratory, 102206, Beijing, China.
3 State Key Laboratory of Membrane Biology, Peking-Tsinghua Joint Center for Life Sciences, School of Life Sciences, Peking University, 100871, Beijing, China. gaon@pku.edu.cn.