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The scores of histological examination of lung tissues of rats in different groups. Results were expressed as the mean ± SEM (n = 10). Significant differences compared with the control group were designated as ∗ P < 0.05, ∗∗ P < 0.01, and ∗∗∗ P < 0.001. Significant differences compared with the COPD group were designated as ## P < 0.01.
