The addition of detergent-solubilized influenza C virus to a reaction mixture containing ATP, CTP, GTP, [3H]UTP, and Mg2+ leads to the synthesis of an acid-insoluble, radioactive product) which is ribonucJease-sensitive. The dinucleoside monophosphate ApG clearly enhances the reaction rate, a fact which indicates that influenza C viruses follow the same strategy of transcription as influenza A and B viruses, the other members of the orthomyxovirus family.

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