title: Mutation in the hemagglutinin of A/N-WS/33 influenza virus recombinants influencing sensitivity to trypsin and antigenic reactivity.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D000939:Epitopes / Q000235:genetics*; D006389:Hemagglutinins, Viral / Q000235:genetics* / Q000276:immunology; D009980:Influenza A virus / Q000235:genetics* / Q000276:immunology / Q000648:ultrastructure; D009154:Mutation; D011995:Recombination, Genetic; D014357:Trypsin / Q000494:pharmacology*; D014764:Viral Proteins / Q000235:genetics / Q000276:immunology
chemical_list: D000939:Epitopes; D006389:Hemagglutinins, Viral; D014764:Viral Proteins; D014357:Trypsin