Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-020-0434-2, published online 2 March 2020.

In the version of this article initially published online, an extra label, reading ARD2, was inserted on the horizontal axis of Fig. 3d between ZNF512B and JARD2. As a result, the labels were misaligned with the image grid. The error has been corrected in the print, PDF and HTML versions of the article.