Correction to: Nature https://doi.org/10.1038/s41586-022-05114-0 Published online 24 August 2022

In the version of the article initially published, there were errors in Fig. 1. In Fig. 1a and b, the dark blue strands, now labelled “NTS”, were mislabelled “TS”. In Fig. 1b the right panel was missing the label “8-nt match”, and Fig. 1c was missing the label “6-nt match”. These errors have been corrected in the HTML and PDF versions of the article.