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Co-infection of influenza A and B viruses (IAV and IBV) results in marked decreases in IAV replication. Multiple mechanisms have been proposed for this phenomenon. Recently, we reported that IBV nucleoprotein (BNP) alone can suppress IAV replication and proposed an inhibition model in which BNP binds IAV nucleoprotein (ANP) and disrupts IAV polymerase complexes. Here, using mutagenesis and co-immunoprecipitation,...