A positive role for polycomb in transcriptional regulation via H4K20me1

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 Lv^{1, *}, Zhijun Han^{2, *}, Hao Chen¹, Bo Yang¹, Xiaofeng Yang¹, Yuanxin Xia¹, Chenyu Pan¹, Lin Fu¹, Shuo Zhang¹, Hui Han¹, Min Wu³, Zhaocai Zhou¹, Lei Zhang^1,5, Lin Li^4,5, Gang Wei², Yun Zhao^1,5

^*These two authors contributed equally to this work.