title: Leukemia as a multistep process: studies with avian retroviruses containing two oncogenes.
authors.affiliation: Differentiation Programme, European Molecular Biology Laboratory, Heidelberg, F.R.G.
authors.forename: T
authors.initials: T
authors.lastname: Graf
mesh_terms: D000818:Animals; D001354:Avian Leukosis Virus / Q000235:genetics*; D002471:Cell Transformation, Neoplastic / Q000473:pathology*; D002472:Cell Transformation, Viral; D007942:Leukemia, Experimental / Q000209:etiology* / Q000235:genetics / Q000473:pathology; D009857:Oncogenes