Fig. 4
From: Role of PM2.5 in the development and progression of COPD and its mechanisms
Morphological and pathological changes of lung tissue in mouse model. The representative micrographs of H&E-stained lung tissue of long-term exposure to PM2.5 with or without CS for 48 weeks (a-d) (200x). a control group; b CS-exposed group; c PM2.5-exposed group; d PM2.5 + CS -exposed group. e Quantitative morphometric measurements of MLI. ** P < 0.01, *** P < 0.001 vs control group