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Serum HDAC4 protein is higher in COPD by biomass than COPD by smoking. The protein HDAC4 level was quantified in serum by ELISA and was expressed in pg /mL (n = 25). * p < 0.01. Abbreviations: COPD-BS, COPD biomass smoke exposure; COPD-TS, COPD by tobacco smoke exposure, HDAC4; Histone Deacetylase 4.
