Leukemia L1210Leukemia P388Leukemia Virus, MurineLeukemia, ExperimentalMoloney murine leukemia virusLeukemia L5178LeukemiaCell LineTrimetrexateTumor Cells, CulturedPteroylpolyglutamic AcidsLeukemia, Myeloid, AcuteFolic Acid AntagonistsCell Line, TumorAKR murine leukemia virusFriend murine leukemia virusBase SequenceMolecular Sequence DataRNA, MessengerHL-60 CellsDrug ResistanceAbelson murine leukemia virusMethotrexateTranscription, GeneticAntineoplastic AgentsCell DivisionCell SurvivalLeukemia, LymphoidLeukemia, MyeloidLeukemia, Lymphocytic, Chronic, B-CellRetroviridae InfectionsLeukemia, Myelogenous, Chronic, BCR-ABL PositiveAmino Acid SequenceDoxorubicinCell Line, TransformedLeukemia, Monocytic, AcuteCell DifferentiationApoptosisK562 CellsRauscher VirusReverse Transcriptase Polymerase Chain ReactionGene Expression Regulation, LeukemicCloning, MolecularLeukemia, T-CellGene ExpressionStructure-Activity RelationshipTransfectionGene Expression RegulationMice, Inbred AKRLeukemia, Promyelocytic, AcutePrecursor Cell Lymphoblastic Leukemia-LymphomaRetroviridaeGene Expression ProfilingPolymerase Chain ReactionMutationNeoplasm ProteinsCells, CulturedDNA, ViralBlotting, NorthernNucleic Acid HybridizationLeukemia, Megakaryoblastic, AcuteLeukemia, B-CellGenes, ViralDNA, ComplementaryDNA, NeoplasmXenotropic murine leukemia virus-related virusDNA PrimersMink Cell Focus-Inducing VirusesDrug Screening Assays, AntitumorPromoter Regions, Genetic