Correction to: (2009) 19:561–573. doi: 10.1038/cr.2009.31; published online 10 March 2009

The authors want to change the affiliations of this paper. The corrected affiliations are as follows.

Huiming Xu1, 2, Weicheng Wang1, 2, Chunliang Li2, Hongyao Yu1, Acong Yang1, 2, Beibei Wang2, Ying Jin1, 2, 3

1 Key Laboratory of Stem Cell Biology, Institute of Health Sciences, Shanghai Jiao Tong University School of Medicine & Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 225 South Chongqing Road, Shanghai 200025, China; 2 Shanghai Stem Cell Institute, Shanghai Jiao Tong University School of Medicine, 225 South Chongqing Road, Shanghai 200025, China; 3 Key laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, China