Correction to: Nature https://doi.org/10.1038/nature24644, published online 25 October 2017.

In this Article, owing to an error during the production process, in Fig. 1a, the dark blue and light blue wedges were incorrectly labelled as ‘G•C → T•A’ and ‘G•C → A•T’, instead of ‘C•G → T•A’ and ‘C•G → A•T’, respectively. Fig. 1 has been corrected online.