Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-021-00594-6, published online 10 May 2021.

In the version of this article initially published, the article that is the subject of the News & Views was not cited in the main text. The citation should have been present in the first paragraph as follows: “Iovino, Giorgetti and colleagues (Nature https://doi.org/10.1038/s41586-021-03460-z (2021)) now identify....” The error has been corrected in the HTML and PDF versions of the article.