title: Further studies on the activation of influenza virus by proteolytic cleavage of the haemagglutinin.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D046508:Culture Techniques; D006023:Glycoproteins / Q000378:metabolism*; D006025:Glycosaminoglycans / Q000378:metabolism; D006389:Hemagglutinins, Viral; D009980:Influenza A virus / Q000254:growth & development* / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism; D014357:Trypsin / Q000378:metabolism; D014764:Viral Proteins / Q000378:metabolism*; D014779:Virus Replication
chemical_list: D006023:Glycoproteins; D006025:Glycosaminoglycans; D006389:Hemagglutinins, Viral; D014764:Viral Proteins; D010447:Peptide Hydrolases; D014357:Trypsin