| http://www.w3.org/ns/prov#value | - Once activated they also produce cytokines such as tumor necrosis factor (TNF) that exerts its cytotoxic activity triggering apoptosis in a similar way to that mediated by Fas; it has indirect effects on tumor vasculature and vascular thrombosis and produces free radicals from which normal cells are protected by the secretion of superoxide dismutase, but not tumoral cells.
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