It is well known that the microbiota influences the development and skewing of the intestinal immune system. Among the multiplicity of innate and adaptive immune cells that colonize the intestine, regulatory T cells (Tregs) are critical for maintaining tissue homeostasis and tolerance to commensal bacteria. Previous reports have described the ability of specific commensals to induce differentiation of RORγ⁺ Tregs in the mouse colon. Interestingly, these microbial ...