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The TCR-αβ/γδ CD8αα intraepithelial T lymphocytes (T-IEL) located in the gut mucosa of the small intestine are an abundant population believed to have a major role in ensuring the integrity of the gut wall. Here, we describe their unique characteristics and the controversies regarding the origin and differentiation of these T-IELs. We show how accumulated experimental evidence has finally arrived...