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[Various properties of ribonucleotide reductase from rat liver mitochondria].

Three fractions of mitochondria (light, heavy and intermediate) from normal and regenerating rat liver ( in 15, 24 and 48 hours after partial hepatectomy) were isolated by means of differential centrifugation. Heavy mitochondrial fraction was shown to have a higher CDP-reductase activity than light mitochondria. The activity of the procces of ribonucleotides reduction in the mitochondria was shown to depend on the tissue functional state and it was maximal in 24 hours after partial hepatectomy.