CD4 and autoimmune pancreatitis: Moreover, building on recent studies highlighting the importance of CXCR3+ Th1 cells and CD4+ CTLs in IgG4‐related disease,[17] we verified the expression of these cell subtypes in our single‐cell AIP dataset and found that Th1 cells constituted ≈25% of the total Th cell population, while typical CD4+ CTLs were not observed (Figure S4G left and middle, Supporting Information).