Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-020-0466-7, published online 30 March 2020.

In the version of this article initially published online, the affiliation for Bin Jia was given as Abbvie Bioresearch Center, Worcester, MA, USA. This has been changed to reflect its status as a present address; the correct primary affiliation is Pfizer, Cambridge, MA, USA. The error has been corrected in the print, PDF and HTML versions of the article.