Correction to: Nature Chemical Biology https://doi.org/10.1038/s41589-021-00883-7, published online 1 November 2021.

In the version of this article initially published, there was a composition error in Fig. 5a where, for the first, fifth and ninth columns correlating to “TON Cys” in the key, the pink color dropped out of the columns and top key. The HTML and PDF versions of the article have been corrected online.