KLRB1 and juvenile idiopathic arthritis: The proportion of integrin α4+β7+ cells in CD161+ Tconv and CD161+ Treg compared to CD161− populations was still significantly higher in JIA SF (Figures 7A,B), although, the proportions of integrin α4+β7+ cells within both CD161+ Tconv (Figure 7A) and CD161+ Treg (Figure 7B) were also lower in JIA SF compared to JIA PB.