Figure 2
Immunohistochemical localization of catalase in human lung. Bronchiolar epithelium in normal control lung shows strong staining (A), whereas bronchiolar epithelium in fibrotic area shows weak staining (B). Bronchiolization (C: white arrows) and squamous metaplasia (D: white arrows) shows faint staining and fibroblastic foci shows negative staining (E: white arrows). Scale bar = 25 μm.