MKI67 and juvenile idiopathic arthritis: Other PB CD3+ T cells were divided into proliferating Ki67+ CD4− T cells (cluster 6, 0.39 ± 0.08% of HC PB, 0.60 ± 0.10% of JIA PB, 0.93 ± 0.20% of SF CD3+, Fig. 4E and F) and Ki67+ CD4+ conventional T cells (Tconv, cluster 13, 0.56 ± 0.10% of HC PB CD3+, 0.64 ± 0.08% of JIA PB CD3+, 0.58 ± 0.11% of SF CD3+, Fig. 4E and H).