Correction to: Nature Neuroscience https://doi.org/10.1038/s41593-018-0075-7, published online 5 February 2018.

In the version of this article initially published, two plasmids were listed incorrectly in the Methods section. Plasmid phDLX1-N174 (#66859) should be #60859, and phDLX2-N174 (#66860) should be 60860. The error has been corrected in the PDF and HTML versions of this article.