Nat. Immunol.; doi:10.1038/ni.3770; corrected online 27 June 2017

In the version of this article initially published online, the labels identifying each plot in Figure 1b were missing. The labels are as follows (left to right): CHO, FcγRI, FcγRIIaR131, FcγRIIaH131, FcγRIIb, FcγRIIIaF158 and FcγRIIIaV158. Also, the reference cited in the accompanying legend (ref. 21) is incorrect. The correct reference is ref. 14. The errors have been corrected in the print, PDF and HTML versions of this article.