Fig. 1From: Correlation between sestrin2 expression and airway remodeling in COPDStaining of airway tissues in control and COPD group. Notes: a H&E stains in control and COPD group; b Subepithelial fibrosis by Masson staining in control and COPD group; c Change of reticular basement membrane thickness by PASM staining in control and COPD group. Magnification, × 400Back to article page