The relationship between the activities of different pools of RNA polymerases I and II during PHA-stimulation of human lymphocytes

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Abstract
Following PHA-stimulation of lymphocytes in culture, it is known that nuclear RNA synthesis and the amount of extractable RNA polymerase activity rise in these cells. The relationship between these two phenomena has been examined. Using an in vitro assay system which discriminates between polymerase activity which is "engaged" in nuclear RNA synthesis and a pool of "free" enzyme, the data suggest that the factors regulating the interaction between these two pools of enzyme activity are different for forms I and II RNA polymerases.

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