In the recent characterization of a conditional Bcl11b knockout mouse, two hepatic γδ T cell subsets with different developmental requirements were described: a NK1.1+CD5− subset generated early in newborn mice producing exclusively IFNγ rapidly upon infection; and a NK1.1−CD5+ subset that comprised both IFNγ and IL‐17 producers.50 The gene discussed is IFNG; the disease is infection.