Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-019-0017-2, published online 11 February 2019

In the version of this Article initially published, Fig. 2d displayed a mistaken image. The original Fig. 2d panel has now been replaced with the correct image. The original and corrected Fig. 2d images are shown below. This change has been made to the online version of this Article.

Fig. 2
figure 1

Original and Corrected.