Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-020-0500-9, published online 27 April 2020.

In the version of this article initially published online, a sentence was missing from the Acknowledgements section: The authors would like to acknowledge the work of Genomics Core Facility of the Skolkovo Institute of Science and Technology, which performed the sequencing and bioinformatic analysis. The error has been corrected in the HTML and PDF versions of the article.