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Comparison of SOD (A), CAT (B), GPx (C) and GR (D) activity between colorectal cancer tissue (n = 29) and normal mucosa (n = 29). The data are presented as median (minimum–maximum). Abbreviations: SOD—superoxide dismutase-1, CAT—catalase, GPx—glutathione peroxidase, GR—glutathione reductase, **** p < 0.0001.
