Hematopoietic SystemHematopoiesisHematopoietic Stem CellsBone Marrow CellsYolk SacCell LineageBone MarrowColony-Forming Units AssayCell DifferentiationMesonephrosMice, Inbred C57BLRadiation-Protective AgentsHematopoiesis, ExtramedullaryWhole-Body IrradiationErythropoiesisMyeloid Progenitor CellsFlow CytometryRadiation Injuries, ExperimentalBone Marrow TransplantationCore Binding Factor Alpha 2 SubunitRadiation ChimeraMice, KnockoutStem Cell NicheAntigens, CD34Cells, CulturedHematopoietic Stem Cell TransplantationBlood Cell CountProto-Oncogene Proteins c-vavRetroviridaeMyeloid CellsBlood CellsLeukemiaEmbryo, MammalianMice, TransgenicChimeraCell ProliferationAntigens, CD45Gene Expression Regulation, DevelopmentalStem CellsProto-Oncogene ProteinsHematopoietic Cell Growth FactorsCell SeparationStem Cell FactorProto-Oncogene Proteins c-kitLiverMultipotent Stem CellsLymphoid TissueErythroid Precursor CellsMegakaryocytesAntigens, LyMice, Inbred CBATranscription FactorsFetal BloodGranulocytesThymus GlandEmbryonic DevelopmentSpleenErythropoietinSignal TransductionOrgan SpecificityHematologic NeoplasmsGene ExpressionClone CellsDNA-Binding ProteinsGenetic VectorsApoptosisT-LymphocytesInterleukin-3Molecular Sequence DataGene Expression RegulationModels, BiologicalTransgenesCell DivisionFetusNeoplastic Stem CellsTime FactorsCell CycleMice, Mutant StrainsCell SurvivalGene Transfer TechniquesMice, SCIDCell LineTransduction, GeneticBase SequenceB-LymphocytesErythrocytesGene Expression ProfilingStromal CellsPhenotypeLymphocytesAntigens, CDMembrane ProteinsLeukocytesTransfectionReverse Transcriptase Polymerase Chain ReactionRNA, MessengerRecombinant ProteinsAmino Acid SequenceCytokinesPromoter Regions, Genetic