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The neuraminidase of influenza virus

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The influenza virus particle is made up of the viral RNA genome wrapped in a lipid membrane (illustrated). The membrane, or envelope, contains three different kinds of viral proteins. The hemagglutinin molecule (HA, blue) attaches to cell receptors and initiates the process of virus entry into cells. I have written about the HA and its function during infection (article one and two) but not about the neuraminidase (NA, red) or M2 (purple) proteins. Let’s first tackle NA.
 
 

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