MR1 and tuberculosis: To evaluate whether TRAV1-2+ CD8+ T cells in the BAL of humans with TB could be stained by MR1/5-OP-RU tetramer, as well as the relationship between MAIT cell-consistent CDR3α usage and MR1/5-OP-RU tetramer staining, we took advantage of two donors with TB with available cryopreserved specimens.