CD4 and juvenile idiopathic arthritis: Most PB T cells were encompassed by clusters 1 and 5 (97.6% ± 0.24 of HC PB, 97.6% ± 0.25 of JIA PB vs 41.1% ± 3.18 of JIA SF T cells, Fig. 4E), representing a PB-dominant resting circulating phenotype for CD4− and CD4+ T cells, respectively (Fig. 4F and H).