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The superoxide dismutase (SOD) (a), catalase (CAT) (b), and glutathione peroxidase (GPx) (c) activity in HEMa-LP cells after 24-h incubation with 0.05 or 0.5 mM of norfloxacin and moxifloxacin. Data are mean ± S.E.M. of at least three independent experiments (n = 3) performed in triplicate. * p < 0.05 versus the control samples; ** p < 0.005 versus the control samples
