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Effects of carbon dioxide on IFN-γ response. Whole-blood samples from TB-free cattle (n = 20) were cultured with or without CO2 (indicated in the lower margin) in air at 37°C. Stimulation was performed with SEB at 1, 0.1, and 0 μg/ml as indicated. ODs obtained for the individual animals are shown. Boxes indicate the lower quartile (25%), the median (50%), and the higher quartile (75%). Responses with and without CO2 did not differ (P > 0.05).
