Cytokines in the lung tissues of mice sensitized and challenged with PBS or OVA. Cytokine mRNA expression levels were measured in the lungs by real time PCR. AU: arbitrary units (A). Representative example of critical cytokines (IFN-? and IL-5) measured by western blotting (WB) (B) and densitometry of WB for expression of IFN-? and IL-5(C,D). *, p <0 .05; **, p <0.01; ***, p <0.001. n =8 mice/group, in two separate experiments.