Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-021-00815-9, published online 8 February 2021.

This paper was originally published under standard Springer Nature license (© The Author(s), under exclusive licence to Springer Nature America, Inc.). It is now available as an open-access paper under a Creative Commons Attribution 4.0 International license, © The Author(s), in accordance with the Nature Transformative Agreement for Germany. The error has been corrected in the print, HTML and PDF versions of the article.