Experiments on rats with inoculated sarcoma-45 combined with chlamydial infection showed activation of processes of lipid peroxidation already at early free radical stage of lipid peroxidation, that resulted in subsequent increase of activity of key antioxidant enzymes: superoxide dismutase and catalase. With progression of the tumour process developing under conditions of chlamydial infection the intensity of the increase of enzyme activity decreased.
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