Correction to: Nature Chemical Biology,, published online 8 October 2018.

In the version of this article originally published, funding information for co-author Aakriti Jain was missing. A sentence has been added to the Acknowledgements section, stating “Work by A.J. was supported by the MetaRNA Marie Skłodowska-Curie Innovative Training Nerwork (642738).” The error has been corrected in the HTML and PDF versions of the paper.