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Immunohistochemical staining for TGF-β localizing expression to (A) allograft small airway epithelial cells and subepithelial infiltrating mononuclear cells, as well as (B) alveolar macrophages. TβRI expression was noted in (C) small airway epithelial cells, subepithelial stromal cells and infiltrating mononuclear cells, as well as (D) infiltrating stromal cells and mononuclear cells within the interstitium.
