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Deng and Shuman (J. Biol Chem.271, 29386 (1996)) reported that an ATPase different from the known viral termination factor, VTF, is required for vaccinia virus early gene transcription termination. Properties of this ATPase were similar to those of a known vaccinia virus enzyme, nucleoside triphosphate phosphohydrolase I (NPH I) the product of gene D11L. Transcription-competent cell-free extracts...