Fig. 4From: Pathogenicity comparison between QX-type and Mass-type infectious bronchitis virus to different segments of the oviducts in laying phaseEffects of QX and Mass-type IBV in different segments of the oviduct on mRNA expression of IFN-α (A), granzyme (B) and perforin (C). Values are shown as the mean ± SEM (n = 3) of fold change in the expression. *P < 0.05, **P < 0.01, ***P < 0.001 represent significant differences between the infection groups and the control group. DPI, days post infection; SEM, standard error of the meanBack to article page