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Th1 and Th2 cytokine production in BAL fluid at 24 h after final allergen challenge. Th1 cytokine IFNγ (a) and Th2 cytokines, IL-4 (b), IL-5 (c) and IL-13 (d) were assayed by ELISA. Data are presented as the mean ± SEM (n = 4 mice per group, per experiment; combination of 3 separate experiments).
