Volume 150, No. 2, February 2018. https://doi.org/10.1085/jgp.201711875

The authors regret that in the original version of this article, author Vincenzo Lariccia’s surname was mispelled.

All versions of this article have been corrected.

This article is available under a Creative Commons License (Attribution 4.0 International, as described at https://creativecommons.org/licenses/by/4.0/).