Nat. Immunol. 18, 74–85 (2017); published online 28 November 2016; corrected after print 23 January 2017

In the version of this article initially published, the label for third bar from the left in Figure 4f ('Anti-IL-6α') was incorrect; the correct label is 'Anti-IL-6Rα'. Also, in the legend for Figure 4f, the description of the treatment conditions for middle four bars ('medium alone, or LPS and anti-IL-6 (MR16-1 or polyclonal antibody), anti-IL-6R (mAb#8)') was incorrect; the correct description is 'LPS alone (Medium), or LPS and anti-IL-6Rα (MR16-1), anti-IL-6 (polyclonal antibody or mAb#8)'. The error has been corrected for the print, PDF and HTML versions of this article.