In the purified plasma membranes of rat liver the antiradical protection systems were revealed involving superoxide dismutase, glutathione peroxidase, glutathione reductase, lipid-dependent and water-soluble catalase, and reduced glutathione. Early changes were observed in these systems after total-body X-irradiation (LD50/30). The authors discuss the role of a plasma membrane in the radiation response of cells.

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