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Serum levels of regulatory T (Treg) cells and T helper type 17 (Th17) -related cytokines in normal controls (NC) and hepatitis C virus (HCV) -infected patients. (a) Interleukin-10 (IL-10), (b) IL-17, (c) IL-22, (d) IL-23, and (e) interferon-γ (IFN-γ) were tested by ELISA. Horizontal bars represent the mean values of the indicated index.
