title: Selective removal of neuraminidase from influenza A 2  viruses.
mesh_terms: D000818:Animals; D000956:Antigens, Viral; D001963:Bromelains; D005260:Female; D006389:Hemagglutinins, Viral; D007114:Immunization; D051379:Mice; D009439:Neuraminidase / Q000032:analysis*; D009975:Orthomyxoviridae / Q000201:enzymology*
chemical_list: D000956:Antigens, Viral; D006389:Hemagglutinins, Viral; D001963:Bromelains; D009439:Neuraminidase