Medullary thymic epithelial cells maintain tolerance by expressing peripheral self antigens. New data show that they also present these antigens, which leads to the deletion of conventional CD4+ T cells and the induction of regulatory T cells.
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Dzhagalov, I., Robey, E. Multitasking in the medulla. Nat Immunol 11, 461–462 (2010). https://doi.org/10.1038/ni0610-461
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DOI: https://doi.org/10.1038/ni0610-461