Cell DifferentiationErythropoiesisHematopoiesisPrecursor Cells, B-LymphoidB-LymphocytesHematopoietic Stem CellsPre-B Cell ReceptorsCell LineageStem CellsB-Lymphocyte SubsetsImmunoglobulin Joining RegionBone Marrow CellsInterleukin-7Mice, Inbred C57BLCells, CulturedBlood CellsSignal TransductionGene Expression Regulation, DevelopmentalMice, TransgenicFlow CytometryCell ProliferationTranscription FactorsMice, KnockoutCell DivisionLymphopoiesisThymus GlandEmbryonic Stem CellsGene Expression RegulationCell LineAntigens, CD34RNA, MessengerCell SeparationColony-Forming Units AssayHomeodomain ProteinsErythrocytesPhenotypeAntigens, CDMolecular Sequence DataReverse Transcriptase Polymerase Chain ReactionDNA-Binding ProteinsReceptors, NotchMice, Inbred BALB CBase SequenceSpleenLymphocyte ActivationBasic Helix-Loop-Helix Transcription FactorsImmunophenotypingBone MarrowMyeloid Progenitor CellsImmunohistochemistryFetal BloodGene ExpressionCell Culture TechniquesEmbryo, MammalianCell MovementPrecursor Cells, T-LymphoidTime FactorsTretinoinProto-Oncogene Proteins c-kitClone CellsMast CellsNeural Stem CellsCell CountT-LymphocytesGene Expression ProfilingNeuronsTrans-ActivatorsCell SurvivalMultipotent Stem CellsStem Cell FactorApoptosisMice, Mutant StrainsFetusTranscription, GeneticModels, BiologicalEpithelial CellsMembrane ProteinsGranulocyte-Macrophage Progenitor CellsAntigens, CD19Biological MarkersAntigens, DifferentiationErythroid Precursor CellsCell CycleUp-RegulationMutationGerminal CenterCoculture TechniquesStromal CellsMesenchymal Stromal CellsStem Cell TransplantationMembrane GlycoproteinsDNA PrimersProto-Oncogene ProteinsDendritic CellsTumor Cells, CulturedLymphoid Progenitor CellsIn Situ HybridizationSex DifferentiationNeurogenesisInterleukin-3