Vol. 215, No. 5, May 7, 2018. 10.1084/jem.20171477.

The authors regret that Edward T.H. Yeh was inadvertently left off the original author list. The corrected author list appears above. The online article has been corrected accordingly. The error exists only in the print version.

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