Correction to: Nature https://doi.org/10.1038/nature19804 Published online 7 September 2016 In the version of the article initially published, in the Day 11 row of Extended Data Fig. 3c, the Chloroquine image was a duplicate of the BRD7929, 25 image from the same row. The correct Chloroquine image has now been added to Extended Data Fig. 3c, as seen in Fig. 1, below.