Molecular Mechanisms of T Cell Co-Stimulation and Co-Inhibition

Nature Reviews Immunology 13, 227–242 (2013) In Figure 1a of the original version of this article, the indicated expression of CD40 and CD40L was incorrect. CD40 should instead be shown on the antigen presenting cell (APC) and CD40L on the T cell. This has now been corrected online. Nature Reviews Immunology apologizes for this error.