Abstract
Mutations in the common γ chain (γc) of cytokine receptors account for human X-linked severe combined immunodeficiency disease. γc contributes to ligand binding and signaling as a component of five cytokine receptors: interleukin-2-receptor (IL-2R), IL-4R, IL-7R, IL-9R and IL-15R. Here, Thomas Malek and colleagues discuss the contribution of individual γc-dependent cytokines in both conventional and intraepithelial T-cell development.