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Expression of MMP-1 in bronchial epithelial cells of human COPD lungs (Segura-Valdez et al., 2000). (A) Differentiated bronchial epithelium (control; also note MMP-1+ macrophages in the bronchial lumen); (B) in striking contrast, a strongly MMP-1-expressing bronchial epithelium from a COPD case. (A color image is available in the online version.)
