Figure 3.

MMP-12⁺-macrophages in IS and BAL. The relative number of MMP-12⁺-macrophages in IS and BAL samples from COPD smokers, COPD ex-smokers, 'healthy' smokers and healthy never-smokers. Data are shown as mean ± SEM. *p < 0.05 compared to healthy never-smokers, #p < 0.05 compared to 'healthy' smokers.