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Bronchial histopathology (light microscopy, H&E staining, ×400) in (A) atopic asymptomatic AHR, (B) non-atopic asymptomatic AHR, (C) mild atopic asthma, and (D) atopic control. Subepithelial layer thicknesses showed greater in (A) and (C) than in (B) and (D).
