Correction to: Cell Research (2016) 26:529–542. doi:10.1038/cr.2016.33; published online on 22 March 2016

The authors apologized for the missing of labeling the first two authors as co-first authors, since they contributed equally to this work. The correct form is as follows. We are also sorry for the delayed notice.

Xiangdong Lv1, *, Zhijun Han2, *, Hao Chen1, Bo Yang1, Xiaofeng Yang1, Yuanxin Xia1, Chenyu Pan1, Lin Fu1, Shuo Zhang1, Hui Han1, Min Wu3, Zhaocai Zhou1, Lei Zhang1,5, Lin Li4,5, Gang Wei2, Yun Zhao1,5

*These two authors contributed equally to this work.