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Effect of antibody treatment during the chronic challenge period on immunoreactivity for active transforming growth factor (TGF)-β1. Intensity of staining (a) in the epithelium and (b) in the subepithelial zone, in animals treated with anti-interleukin (IL)-4 or anti-IL-25 during the chronic challenge period. Significant differences compared to naive animals shown as *P < 0·05.
