Vol. 216, No. 8, August 5, 2019. 10.1084/jem.20190490.
JEM regrets that in the original version of this paper, panels E-G were mistakenly omitted from Fig. 4 due to a production error. The corrected and complete Fig. 4 appears on the following page.
The online and print versions of this article have been corrected. The error appears only in PDF versions downloaded on or before July 31, 2019.