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Increased collagen deposition in lung tissue was determined using Masson staining. (A) Substantial collagen deposition was observed in the interstitium of the asthmatic group. (B) Collagen deposition was reduced in the budesonide-treated group when compared with the asthmatic group. (C) Small quantity of collagen deposition in pulmonary interstitial was observed in the healthy control group. Magnification, ×100.
