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iNOS protein expression in peripheral lung tissue from NSC subjects, SC subjects, and COPD patients. (a) Representative Western blot analysis of iNOS and β-actin; (b) Densitometric analysis of iNOS and β-actin bands. Each bar represents the median ± interquartile of each group. *P < 0.01 versus group NSC, #P = 0.01 versus group SC. iNOS: inducible nitric oxide synthase; NSC: Nonsmokers control; SC: Smokers control; COPD: Chronic obstructive pulmonary disease.
