Flu virus, illustration
Flu virus. Illustration showing an influenza (flu) virus with surface glycoprotein spikes hemagglutinin (HA, trimer, purple) and neuraminidase (NA, tetramer, pink). The glycan components of the hemagglutinin spikes are green. Hemagglutinin takes part in attachment of a virus to human respiratory cells and neuraminidase participates in a release of virus from a cell., by KATERYNA KON/SCIENCE PHOTO LIBRARY
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