title: Oncornavirus released from long-term cultures of human leukemic cells.
mesh_terms: D002478:Cells, Cultured; D005347:Fibroblasts; D006801:Humans; D007938:Leukemia / Q000382:microbiology*; D008854:Microscopy, Electron; D009858:Oncogenic Viruses / Q000302:isolation & purification*; D012367:RNA, Viral; D012190:Retroviridae / Q000302:isolation & purification*; D014316:Tritium
chemical_list: D012367:RNA, Viral; D014316:Tritium