IFNG and infection: Indeed, group 1 of these innate lymphoid cells, called ILC1s, in addition to the expression of IL-7R at their surface as the other ILCs, the ILC1 subsets expressed T-bet, which is required for their differentiation, and these cell subsets produce the IFN-γ, Th1 cytokine required to control intracellular infections as demonstrated in the case of infection with Toxoplasma gondii (Klose et al., 2014).