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 takes part in attachment of a virus to human respiratory cells and neuraminidase participate in a release of virus from a cell.
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