Correction to: Nature Immunology https://doi.org/10.1038/ni.2423, published online 30 September 2012.

In the version of this article initially published, in Fig. 5a, the flow cytometry plot that is second from the right in the bottom row (+LPS, +TGF-β + APRIL, +αCD40; NIKKO mice) did not display the correct data. The error occurred when the figure was converted from color to black and white; no changes were made to the data. The original and corrected Fig. 5a are shown below. The error has not been corrected in the original article.

Fig. 5a
figure 1

Original and corrected.