Correction to: Nature Neuroscience https://doi.org/10.1038/s41593-019-0380-9, published online 22 April 2019.

In the version of this article initially published, the y-axis labels in Figs. 5a and 6e should have read Olig2+ + CC1+. The error has been corrected in the HTML and PDF versions of the article.

Fig. 5
figure 1

Orginal and Corrected.

Fig. 6
figure 2

Orginal and Corrected.