Correction to: Nature https://doi.org/10.1038/s41586-021-03770-2Published online 28 July 2021

In the version of this article initially published, there was an error in Fig. 1a. An extraneous exon “e7” appeared in the “out of frame” part of the schematic and has now been removed. Further, the Data Availability section has been updated as follows: “Sequences encoding Xon and miniXon along with primer sequences and details on the custom TaqMan gene expression assays to determine SF3B3 novel exon inclusion are available on the Davidson lab website (https://www.thedavidsonlab.com). Plasmids encoding Xon and miniXon are available from Addgene (nos. 174659, 175660).

These errors have been corrected in the online version of the article.