Correction to: Cell Research (2010) 20:713–727. doi: 10.1038/cr.2010.47; published online 6 April 2010

Due to a production error, a mistake has been introduced in the doi number of this paper in the print version. The corrected doi number is as follows:

Cell Research (2010) 20:713–727. 10.1038/cr.2010.47; published online 6 April 2010