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Concentrations of IFN-γ from BALF of cockroach-sensitized and cockroach-challenged mice. After final methacholine challenge, mice were killed and BALF was collected, and IFN-γ levels were analyzed using an ELISA Th1 and Th2 Ready-Set-Go Kit. Data are shown as mean ± SEM for three mice in each group. ΨP < 0.05, *P < 0.01, **P < 0.001.
