Vol. 215, No. 12, December 3, 2018. 10.1084/jem.20181206.

JEM regrets that in the original version of this paper, the labels in Fig. 2, C and D, appeared incorrectly as a result of a production error. The figure appears below with the corrected labels “1 mo,” “2 mo,” and “6 mo.” 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/).