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RT-qPCR analysis of cytokine genes in the spleen of chickens infected with the chimeric viruses. a IFN-β. b IL-1β. c IL-18. The data are the mean fold change ± standard error of the mean (SEM). Expression values of cytokine genes were compared among the chimeric viruses sharing the same backbone using one-way ANOVA followed by LSD multiple-comparison test. Asterisk (*) indicates significant difference at p < 0.05
