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a) CD4, CD8 and mast cell chymase (CMA1) staining in arterial layers of normal control (NC) and patients with idiopathic pulmonary fibrosis (IPF). Images were taken at 40× magnification. b) Neutrophil elastase (NE), CD68 and PDGFR-β staining in arterial layers of NC and patients with IPF. Images were taken at 40× magnification, and the insert image was taken at 100× with a bright field.
