Nature 521, 357–361 (2015); doi:10.1038/nature14231

In Extended Data Fig. 3b of this Letter, 52 flow cytometry dot plots with double stainings for CD19 and ITIM-bearing receptors (PECAM1, LAIR1, CD300A and BTLA) were shown for 13 samples. The CD19-CD300A staining for sample ICN1 was inadvertently replaced with CD19-CD300A staining for sample PDX2. The Supplementary Information for this Corrigendum contains the corrected Extended Data Fig. 3b (showing the correct dot plot for sample ICN1). Our conclusions are not affected.