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Immunohistochemical staining for collagen I, versican, and decorin in airway biopsies of control subjects (A–C), and in COPD patients (D–F).
Note: In the biopsy specimens from COPD patients, collagen I, versican, and decorin were prominent within the subepithelial layer.
Abbreviation: COPD, chronic obstructive pulmonary disease.
