SUMMARY
A K R leukemic mouse cells possess a considerable uridine X-inase activity. The ability of unpurijied cell-fvee extracts prepared .from these cells to phosphorylate nucleosides-ldC was investigated.The substrate specijicity of the enzyme preparation and the possibility to regulate the course of the enzymatic reactions were examined. The method is convenient for the preparative synthesis of uracil, cytosine and hypoxanthine S-n~cleotides-~~C.
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