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Effects of MMP-4, MMP-7, and MMP-12 on the levels of ROS in oxidative damage HepG2 cells at the concentration of 10, 50, and 100 μM. The data are presented as the mean ± SD (n = 3). ### p < 0.001 versus the blank control group; *** p < 0.001 versus the H2O2 treated group.
