title: Crystalline antigen from the influenza virus envelope.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D001963:Bromelains / Q000494:pharmacology; D002499:Centrifugation, Density Gradient; D003460:Crystallization; D004586:Electrophoresis; D004592:Electrophoresis, Starch Gel; D006385:Hemagglutination Inhibition Tests; D006389:Hemagglutinins, Viral / Q000302:isolation & purification*; D005779:Immunodiffusion; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D008970:Molecular Weight; D009975:Orthomyxoviridae / Q000187:drug effects / Q000276:immunology*; D011817:Rabbits / Q000276:immunology
chemical_list: D006389:Hemagglutinins, Viral; D001963:Bromelains