MeSH definition : Membrane glycoproteins from influenza viruses which are involved in hemagglutination,
virus attachment, and envelope fusion. Fourteen distinct subtypes of HA glycoproteins
and nine of NA glycoproteins have been identified from INFLUENZA A VIRUS; no subtypes
have been identified for Influenza B or Influenza C viruses.;
Membrane glycoproteins from influenza viruses which are involved in hemagglutination,
virus attachment, and envelope fusion. Fourteen distinct subtypes of HA glycoproteins
and nine of NA glycoproteins have been identified from INFLUENZA A VIRUS; no subtypes
have been identified for Influenza B or Influenza C viruses.