Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-021-01039-7, published online 4 October 2021.

The Supplementary Information file initially accompanying this article had a typographical error in the final oligonucleotide sequence shown in Supplementary Note 1 (specifically, CCC appeared as GGG) and the file has now been replaced.

The changes have been made to the online version of the article.