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The messenger RNA (mRNA) levels of nuclear factor erythroid-2 like 2 (NRF2), heme-oxygenase1 (HMOX1), and kelch-like ECH-associated protein 1 (KEAP1) of diaphragm muscle. Data are expressed as mean ± standard deviation. A = p < 0.05: compared to control group; B = p < 0.05: compared to smoke group; C = p < 0.05: compared to exercise group.
