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A new method for determination of RNA polymerase (RNAP) activity is presented. The method uses nucleoside tri- and tetraphosphate derivatives carrying 4-methylumbelliferone residue at the terminal phosphate. Incorporation of such compounds in RNA by RNA polymerase is accompanied by release of di- and triphosphate derivatives of 4-methylumbelliferone. Subsequent treatment by alkaline phosphatase produces...
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