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Structures of the influenza polymerase. (A) X-ray crystal structures of the viral polymerase complexes from the bat influenza A/H17N10 virus (PDB: 4WSB)26. PA: green; PB1: yellow; PB2: magenta. (B) X-ray crystal structure of PAC-PB1N (PDB: 3CM8)27. PA: green; PB1: yellow.