title: Antigenic variation in three distinct determinants of an influenza type A haemagglutinin molecule.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis*; D002999:Clone Cells / Q000276:immunology; D000939:Epitopes; D006389:Hemagglutinins, Viral / Q000032:analysis*; D009980:Influenza A virus / Q000235:genetics / Q000276:immunology*; D009154:Mutation
chemical_list: D000956:Antigens, Viral; D000939:Epitopes; D006389:Hemagglutinins, Viral