title: Attenuation of avian reticuloendotheliosis virus: loss of the defective transforming component during serial passage of oncogenic virus in fibroblasts.
mesh_terms: D000818:Animals; D002471:Cell Transformation, Neoplastic; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D003370:Coturnix; D003673:Defective Viruses / Q000254:growth & development / Q000502:physiology*; D005347:Fibroblasts; D006378:Helper Viruses / Q000254:growth & development; D012367:RNA, Viral / Q000032:analysis; D001356:Reticuloendotheliosis virus / Q000254:growth & development / Q000502:physiology*; D012190:Retroviridae / Q000502:physiology*
chemical_list: D012367:RNA, Viral