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Real-time quantification of ChIFN-γ mRNA expression by splenocytes from four IBV-infected layer chickens, at four different time points after stimulation with IBV M41 (105 EID50) or IBV H120 (105 EID50). Each bar represents the mean fold increase (plus standard deviation) in ChIFN-γ mRNA production compared to unstimulated splenocytes from the same birds.
