Correction to: Nature https://doi.org/10.1038/nature09879 Published online 23 February 2011

In the version of the article initially published, four panels (the BJ-iPSC lamin B1 and H3K9Me3 panels for clone 5 in Supplementary Fig. 3, and the BJ-iPSC Ku70 and lamin B1 panels in Supplementary Fig. 16) were inadvertently sourced from other experimental groups within the paper. The images have now been corrected and the amended Supplementary information is available alongside the online version of this notice. The changes do not alter the results or conclusions of the paper.