Nature Immunology 6, 844–851 (2005).

On page 845, the last sentence should begin “The selective non-α7 nAChR antagonist dihydro-β-erythroidine....” On page 848, in the legend for Figure 7, lines 15–16, the scale bar should be described as “Scale bar, 20 μm (40 μm for far left image).”