CD69 and sarcoidosis: MAIT cells from sarcoidosis patients also showed greater CD69 expression after C. acnes stimulation; however, the proportion of CD69+ MAIT cells did not significantly differ between unstimulated cells and C. acnes-stimulated cells (P = 0.05 and P = 0.20, respectively) (Fig. 1C-D), probably because MAIT cells in unstimulated PBMCs already highly express CD69.