CCR6 and type 1 diabetes mellitus: We observed decreased levels of CCR5 and β7 integrin but not CCR6 expression on MAIT cells in children with type 1 diabetes compared with control children (median 90.0% vs 94.3% CCR5+ MAIT cells, p = 0.02, and median 73.5% vs 81.7% of β7 integrin+ MAIT cells, p = 0.004, respectively; Fig. 3d–f), even after stratification by age (ESM Fig. 5).