Lymphoid Progenitor CellsCell DifferentiationErythropoiesisHematopoiesisLymphopoiesisHematopoietic Stem CellsCell LineageStem CellsBone Marrow CellsCells, CulturedPrecursor Cells, B-LymphoidMyeloid Progenitor CellsReceptors, Interleukin-7Mice, Inbred C57BLB-LymphocytesB-Cell-Specific Activator ProteinMice, KnockoutThymus GlandSignal TransductionMice, TransgenicInterleukin-7Transcription FactorsFlow CytometryBlood CellsMultipotent Stem CellsAntigens, CD34Cell ProliferationGene Expression Regulation, DevelopmentalHomeodomain ProteinsColony-Forming Units AssayCell LineMyeloid CellsCell DivisionEmbryonic Stem CellsMyelopoiesisGene Expression RegulationDNA-Binding ProteinsT-LymphocytesBone MarrowLymphocytesStromal CellsErythrocytesCell SeparationProto-Oncogene Proteins c-kitfms-Like Tyrosine Kinase 3Receptors, NotchReceptor, Notch1Reverse Transcriptase Polymerase Chain ReactionFetal BloodGene ExpressionPhenotypeRNA, MessengerImmunophenotypingLeukopoiesisAntigens, LyB-Lymphocyte SubsetsTrans-ActivatorsCoculture TechniquesLymphocyte SubsetsAntigens, CDFetusMembrane ProteinsAntigens, CD7Gene Expression ProfilingTretinoinNeural Stem CellsMolecular Sequence DataGene Knock-In TechniquesLymphoid TissueBasic Helix-Loop-Helix Transcription FactorsMice, Mutant StrainsAntigens, CD19Base SequenceImmunohistochemistryMice, Inbred BALB CErythroid Precursor CellsCell Culture TechniquesEmbryo, MammalianKiller Cells, NaturalNeuronsDendritic CellsMesenchymal Stromal CellsAntigens, Thy-1Mice, CongenicTime FactorsSpleenVDJ RecombinasesSex DifferentiationNeurogenesisAntigens, DifferentiationIn Situ HybridizationBone Marrow TransplantationModels, BiologicalGranulocytesBlood Cell CountOsteogenesisTranscription, GeneticNerve Tissue ProteinsRepressor ProteinsOsteoblasts