title: CONDITIONAL-LETHAL MUTANTS OF AN ANIMAL VIRUS: IDENTIFICATION OF TWO CISTRONS.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D005347:Fibroblasts; D008660:Metabolism; D009154:Mutation; D011506:Proteins / Q000378:metabolism*; D012313:RNA; D012367:RNA, Viral; D012106:Research; D012845:Sindbis Virus; D014714:Vertebrates; D014776:Virus Cultivation; D014780:Viruses
chemical_list: D011506:Proteins; D012367:RNA, Viral; D012313:RNA
keywords: CHICK EMBRYO; EXPERIMENTAL LAB STUDY; FIBROBLASTS; METABOLISM; MUTATION; PROTEIN METABOLISM; RNA, VIRAL; VERTEBRATE VIRUSES; VIRUS CULTIVATION