title: Different pseudotypes of Friend spleen focus-forming virus induce polycythemia and erythropoietin-independent colony formation in serum-free medium.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D003470:Culture Media; D003673:Defective Viruses; D004921:Erythropoietin / Q000494:pharmacology; D005347:Fibroblasts; D005622:Friend murine leukemia virus; D006378:Helper Viruses / Q000502:physiology; D006412:Hematopoietic Stem Cells / Q000378:metabolism; D009052:Leukemia Virus, Murine / Q000502:physiology; D051379:Mice; D008811:Mice, Inbred DBA; D011086:Polycythemia / Q000209:etiology*; D013154:Spleen / Q000166:cytology
chemical_list: D003470:Culture Media; D004921:Erythropoietin