CD4 and juvenile idiopathic arthritis: CD161highCD226intermediateHLA-DRlow cluster 3 cells (likely a mixture of CD8+ and CD8-TCRγδ−, Supplementary Fig. S7A) may contain CD4− mucosal associated invariant T (MAIT) cells (1.26% ± 0.49 of SF, 0.0% of HC/JIA PB T cells, Fig. 4F and G), which have been reported to be enriched in tissues [34–36].