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Crystal structure of polymerase acid protein (PA) from Influenza A virus, WILSON-SMITH/1933 (H1N1) bound to follow on fragment EBSI-4719 5-chloro-2-(1H-imidazol-1-yl)aniline
PA_I33A0 Implicated in endonuclease cleavage of capped RNA primers. Displays an elongation factor activity in viral RNA synthesis. Dispensable for viral transcription, but not replication.