Figure 3. HE staining of lung tissue from rats. (A–C) Representative image of HE staining of lung tissue from control rats, COPD rats with lower β2M and COPD rats with higher β2M, respectively. The right panel shows quantification of alveolar wall and septum thickness in control rats, COPD rats with lower β2M and COPD rats with higher β2M. P<0.05 in COPD rats with lower β2M versus control and in COPD rats with higher β2M versus COPD rats with lower β2M. Bars represent Means.