The more things change ...
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D001483:Base Sequence; D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D000939:Epitopes; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D006389:Hemagglutinins, Viral / Q000235:genetics / Q000276:immunology*; D009980:Influenza A virus / Q000276:immunology*; D046911:Macromolecular Substances; D008958:Models, Molecular
D000939:Epitopes; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D006389:Hemagglutinins, Viral; D046911:Macromolecular Substances