title: Antigenic variation in influenza virus.
mesh_terms: D000595:Amino Acid Sequence; D000939:Epitopes / Q000032:analysis*; D006388:Hemagglutinins / Q000032:analysis; D046911:Macromolecular Substances; D008958:Models, Molecular; D009975:Orthomyxoviridae / Q000276:immunology*
chemical_list: D000939:Epitopes; D006388:Hemagglutinins; D046911:Macromolecular Substances