title: Studies on the origin of pandemic influenza viruses V. Persistence of Asian influenza virus hemagglutinin (H2) antigen in nature?
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000956:Antigens, Viral / Q000032:analysis; D004372:Ducks / Q000382:microbiology*; D000939:Epitopes; D006389:Hemagglutinins, Viral / Q000032:analysis; D006801:Humans; D007251:Influenza, Human / Q000209:etiology / Q000382:microbiology*; D009439:Neuraminidase / Q000276:immunology; D009975:Orthomyxoviridae / Q000276:immunology*; D010455:Peptides / Q000032:analysis
chemical_list: D000956:Antigens, Viral; D000939:Epitopes; D006389:Hemagglutinins, Viral; D010455:Peptides; D009439:Neuraminidase