TGFB1 and autoimmune hepatitis: To further analyse the relationship among the numbers of TFR/TFH cells and the levels of serum TFR/TFH‐related cytokines, we next performed a set of correlation analyses and found that the numbers of circulating TFR cells in AIH patients are positively associated with the levels of serum IL‐10 (Figure 3D) and TGF‐β1 (Figure 3E), but negatively correlated with the numbers of circulating TFH cells (Figure 3A) as well as the levels of serum IL‐21 (Figure 3C).