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γ-GCS mRNA and Nrf2 and Bach1 protein in the nucleus in patients with stable stage COPD and AECOPE. *P<0.05 and **P<0.01 vs. stable stage of COPD. Nrf2, nuclear factor erythroid 2-related factor 2; Bach1, BTB-CNC allogeneic 1; γ-GCS, γ-glutamic acid cysteine synthase; COPD, chronic obstructive pulmonary disease; AE, acute exacerbation.
