Cell DifferentiationErythropoiesisHematopoiesisMacrophagesHematopoietic Stem CellsGranulocytesGranulocyte-Macrophage Progenitor CellsColony-Forming Units AssayBone Marrow CellsColony-Stimulating FactorsMyeloid Progenitor CellsCells, CulturedMacrophage ActivationMacrophage Colony-Stimulating FactorStem CellsCell DivisionBone MarrowMice, Inbred C57BLMacrophages, PeritonealGrowth SubstancesCell LineageMacrophages, AlveolarBlood CellsSignal TransductionCell LineGene Expression Regulation, DevelopmentalTranscription FactorsRNA, MessengerMice, KnockoutGene Expression RegulationCell ProliferationEmbryonic Stem CellsErythrocytesFlow CytometryMice, TransgenicReverse Transcriptase Polymerase Chain ReactionMonocytesMolecular Sequence DataImmunohistochemistryAntigens, CD34PhenotypeHomeodomain ProteinsPhagocytosisDNA-Binding ProteinsGene ExpressionBase SequenceTime FactorsTretinoinMice, Inbred BALB CNeural Stem CellsAntigens, CDCell Culture TechniquesBasic Helix-Loop-Helix Transcription FactorsCytokinesCell SeparationAntigens, DifferentiationApoptosisLipopolysaccharidesErythroid Precursor CellsGene Expression ProfilingCell CountEmbryo, MammalianNeuronsCell MovementCell SurvivalMesenchymal Stromal CellsTranscription, GeneticIn Situ HybridizationUp-RegulationB-LymphocytesModels, BiologicalBlotting, WesternTrans-ActivatorsDown-RegulationMembrane ProteinsCoculture TechniquesSpleenBiological MarkersSex DifferentiationTransfectionNeurogenesisT-LymphocytesReceptors, NotchPromoter Regions, GeneticRecombinant ProteinsBlood Cell CountEpithelial CellsTumor Cells, CulturedMultipotent Stem CellsFetal BloodLymphoid Progenitor CellsNerve Tissue ProteinsRepressor ProteinsOsteogenesisMutationCell CycleOsteoblastsDNA PrimersAmino Acid SequenceTumor Necrosis Factor-alpha