title: A nonconditional mutant of Rous sarcoma virus containing defective polymerase.
mesh_terms: D001358:Avian Sarcoma Viruses / Q000201:enzymology / Q000235:genetics*; D002472:Cell Transformation, Viral; D002999:Clone Cells; D005814:Genes, Viral; D009154:Mutation; D009693:Nucleic Acid Hybridization; D012367:RNA, Viral / Q000235:genetics; D012194:RNA-Directed DNA Polymerase / Q000096:biosynthesis*; D014764:Viral Proteins / Q000096:biosynthesis; D014771:Virion / Q000201:enzymology
chemical_list: D012367:RNA, Viral; D014764:Viral Proteins; D012194:RNA-Directed DNA Polymerase