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Synthesis of influenza virus mRNA by the viral RNA polymerase complex is primed by capped RNA fragments generated by endonuclease cleavage of host pre-mRNA by the polymerase subunit PB1. In previous studies, endonuclease and promoter-binding sites have been described in the C-terminal region of PB1. Here, we have identified an additional region near the C-terminus of PB1 involved in producing capped...
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