1 MOE Key Laboratory of Protein Science, Tsinghua University, Beijing, China.
2 School of Life Science, Tsinghua University, Beijing, China.
3 Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program, Beijing, China.
4 Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China.
5 State Key Laboratory of Membrane Biology, Peking-Tsinghua Joint Center for Life Sciences, School of Life Sciences, Peking University, Beijing, China. [email protected].
6 MOE Key Laboratory of Protein Science, Tsinghua University, Beijing, China. [email protected].
7 School of Life Science, Tsinghua University, Beijing, China. [email protected].
8 Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, Beijing, China. [email protected].
In the version of this article initially published, the date of publication (13 March 2019) was incorrect. The correct date is 14 March 2019. The error has been corrected in the HTML and PDF versions of the article.