title: Transformation-defective mutants of avian sarcoma viruses: the genetic relationship between conditional and nonconditional mutants.
mesh_terms: D001358:Avian Sarcoma Viruses / Q000032:analysis / Q000254:growth & development*; D002471:Cell Transformation, Neoplastic; D003433:Crosses, Genetic; D046508:Culture Techniques; D005347:Fibroblasts; D009154:Mutation; D012367:RNA, Viral / Q000032:analysis; D013696:Temperature
chemical_list: D012367:RNA, Viral