Nature Reviews Molecular Cell Biology (2019) https://doi.org/10.1038/s41580-019-0099-1 Published online 07 February 2019

Figure 2 of the article as originally published contained a graphic editing error, whereby the publisher’s redrawn figure wrongly indicated the presence of a Drosophila melanogaster orthologue of ZUP1. This has been corrected in the HTML and PDF versions of the manuscript.