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H9N2 AIV infection promotes mRNA expression of proinflammatory cytokines IFN-γ, IL-22, IFN-α, and IL-17A, as found by real-time RT-PCR. (A) IFN-γ expression at 5 dpi and 12 dpi; (B) IL-22 expression at 5 dpi and 12 dpi; (C) IFN-α expression at 5 dpi and 12 dpi; (D) IL-17A expression at 5 dpi and 12 dpi. ** p < 0.01, * p < 0.05.
