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Cellular immune responses in lung suspensions after virus challenge. TNF-α (A), IL-4 (B), and IFN-γ (C) were measured in lung suspensions of MN and subcutaneously vaccinated animals 24 weeks after vaccination and 4 days after challenge with 10× LD50 of live virus. Groups are as described in Figure 4 legend. Data represent the mean ± standard error of the mean (SEM).
