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Relative mRNA and protein expression levels of (A) IFN-γ, (B) IL-17A, (C) IL-4 and (D) TGF-β are shown for the control, mild ankylosing spondylitis and severe ankylosing spondylitis groups. Different letters indicate a significant difference among the groups (P<0.05). IFN, interferon; IL, interleukin; TGF, tumor growth factor.
