KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Swine flu virus H1N1 Illustration showing influenza virus with surface glycoprotein spikes hemagglutinin (HA, trimer) and neuraminidase (NA, tetramer). Hemagglutinin is involved in the attachment of the virus to a human respiratory cell. Neuraminidase participates in the release of a virus from a cell.
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