Although MAIT cells in adult patients with AIH display an activated phenotype with high GZMB expression, their core effector functions (such as IFN‐γ secretion) are significantly impaired, presenting a contradictory state of “activation–exhaustion.” Moreover, the number of GZMB+ MAIT cells infiltrating the liver tissue is positively correlated with the severity of liver fibrosis [188]. This evidence concerns the gene GZMB and autoimmune hepatitis.