Furthermore, the reactivity of our MR1-restricted TCRs to breast cancer cells was not inhibited by MR1 antagonist, Ac-6-FP, or anti-MR1 mAb, while that of MAIT cells and the reported MR1-restricted T cells was inhibited by 6-FP, Ac-6-FP, and anti-MR1 mAb (Table S1) [11,12]. Here, MR1 is linked to breast cancer.