Fig. 3From: Acute exacerbations of COPD are associated with significant activation of matrix metalloproteinase 9 irrespectively of airway obstruction, emphysema and infectionImmunocytochemistry. Immunocytochemical detection of MMP-2, MMP-9 and MMP-12 protein expression on cytospins of BAL from patients with COPD (magnification 200x). MMP-2 and MMP-9 expression was observed in neutrophils and macrophages (a-d). MMP-12 expression was only observed in macrophages (e) and not in neutrophils (f). Insert bars represent 50 μmBack to article page