title: Evidence for antigenic variation in influenza A nucleoprotein.
mesh_terms: D000956:Antigens, Viral; D000939:Epitopes; D005814:Genes, Viral; D009980:Influenza A virus / Q000235:genetics / Q000276:immunology*; D009698:Nucleoproteins / Q000276:immunology*; D011995:Recombination, Genetic; D014764:Viral Proteins / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D000939:Epitopes; D009698:Nucleoproteins; D014764:Viral Proteins