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The KOR agonist U50448H reduces the levels of ROS and MMP-9 and apoptosis in lung tissues of ALI rats. (a) The ELISA results of GSH, MDA, and SOD levels. (b) The level of ROS detected by the immunofluorescence assay (scale bar = 50 μm); (c) the results of TUNEL staining (scale bar = 50 μm); (d) Western blot analysis of MMP9 expression. ∗P < 0.05 compared to the Sham group; #P < 0.05 compared to the CPB group.
