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Influenza virus structure. 3D computer artwork showing the structure of a generic influenza
virion. A portion of the virion's protein coat (capsid) has been cut away, revealing its core
ribonucleic acid proteins (RNP, green). The surface proteins (blue, haemagglutinin [H];
and red, neuraminidase [N]), are shown, as well as ion channels (blue, round). These struc-
tures are identified in a key at right.
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