IL-6-, IL-12-, and IL-23-induced STAT activation in resting T, B, and NK cells. (A) Dot plot example of IL-6-induced STAT3-pY in resting lymphocytes; isotype control is shown in the upper panel. (B–D) Frequency of IL-6-induced STAT3-pY+ CD4+ T cells (B), CD8+ T cells (C), and B cells (D) in healthy controls (HC) and patients with RRMS. (E) Dot plot example of IL-12-induced STAT4-pY in resting lymphocytes; isotype control is shown in the upper panel. (F–H) Frequency of IL-12-induced STAT4-pY+ CD4+ T cells (F), CD8+ T cells (G), and NK cells (H) in healthy controls and patients with RRMS. (I) Dot plot example of IL-23-induced STAT3-pY+ in resting lymphocytes; isotype control is shown in the upper panel. (J–L) Frequency of IL-23-induced STAT3-pY+ CD4+ T cells (J), CD8+ T cells (K), and NK cells (L) in healthy controls and patients with RRMS. The median value is shown for all groups analyzed.