title: Analysis of virion RNA segments and polypeptides of influenza A virus recombinants of defined virulence.
mesh_terms: D005814:Genes, Viral; D006389:Hemagglutinins, Viral / Q000235:genetics; D009980:Influenza A virus / Q000235:genetics* / Q000472:pathogenicity*; D007252:Influenza Vaccines / Q000032:analysis; D012367:RNA, Viral / Q000032:analysis / Q000235:genetics*; D011995:Recombination, Genetic; D014613:Vaccines, Attenuated / Q000032:analysis; D014764:Viral Proteins / Q000032:analysis / Q000235:genetics*
chemical_list: D006389:Hemagglutinins, Viral; D007252:Influenza Vaccines; D012367:RNA, Viral; D014613:Vaccines, Attenuated; D014764:Viral Proteins