Correction to: Nature Immunology https://doi.org/10.1038/ni.3036, published online 17 November 2014.

In the version of the article initially published, the “0” dot plot in Fig. 6c was a duplicate of the “1” dot plot in Fig. 7a. The correct Fig. 6c is shown below as Fig. 1. This notice serves to amend the error.

Fig. 1
figure 1

Corrected Fig. 6c.