Harvey murine sarcoma virusSarcoma Viruses, MurineHistory, 17th CenturyMythologyKirsten murine sarcoma virusOncogenesHistory, 16th CenturyGammaretrovirusOncogene Protein p21(ras)Portraits as TopicHistory, 18th CenturyGenes, rasBlood CirculationCell Transformation, ViralHistory, 15th CenturyPhilosophy, MedicalHistory, 19th CenturyRetroviridaeCell Transformation, NeoplasticCardiologyGenes, ViralHelper VirusesVariola virusProto-Oncogene Proteins p21(ras)Sarcoma, ExperimentalDisabled PersonsMoloney murine leukemia virusBase SequenceHistory, 20th CenturyDefective VirusesDNA, RecombinantDNA, ViralProto-OncogenesCell LineGuanine NucleotidesRNA, ViralNucleic Acid HybridizationViral ProteinsTransfectionGenetic VectorsCodonCloning, MolecularDNA Restriction EnzymesHomeless PersonsUnited StatesRepetitive Sequences, Nucleic AcidMutationMentally Ill PersonsCells, CulturedVisually Impaired PersonsMentally Disabled PersonsGene Expression RegulationRisk Factors