Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-019-0159-2, published online 1 July 2019.

In the version of this article initially published, the second NIH grant “R24-DK49216” to author George Q. Daley contained an error. The grant number should have read U54DK110805. The error has been corrected in the HTML and PDF versions of the article.