Correction to: Nature https://doi.org/10.1038/s41586-019-0964-2, published online 20 February 2019.
In this Article, owing to an error during the production process, the label on the y-axis of Fig. 2c should read “Number of Tβ-syn cells” rather than “Number of T1β-syn cells” and the left and right panels of Fig. 4 should be labelled ‘a’ and ‘b’, respectively. These errors have been corrected online.