Cell LineageCell DifferentiationStem CellsGene Expression Regulation, DevelopmentalPhylogenyMolecular Sequence DataAstronautsTranscription FactorsCells, CulturedBase SequenceHematopoietic Stem CellsEmbryonic Stem CellsMice, Inbred C57BLIn Situ HybridizationSignal TransductionHomeodomain ProteinsCell LineFlow CytometryPhenotypeImmunohistochemistryEmbryo, MammalianGene Expression RegulationRNA, MessengerGene ExpressionCell DivisionMesodermGerm CellsCell SeparationGreen Fluorescent ProteinsEvolution, MolecularAmino Acid SequenceMicrodissectionMice, KnockoutDNA-Binding ProteinsEmbryo, NonmammalianChimeraMorphogenesisModels, BiologicalNeuronsBasic Helix-Loop-Helix Transcription FactorsEndodermOrgan SpecificityThymus GlandB-LymphocytesGene Expression ProfilingMutationCaenorhabditis elegansBone Marrow CellsAnimals, Genetically ModifiedReverse Transcriptase Polymerase Chain ReactionPluripotent Stem CellsT-LymphocytesNational Center for Health Statistics (U.S.)Clone CellsCell ProliferationTransgenesBiological EvolutionIntegrasesDrosophilaGene TargetingDrosophila ProteinsDNA PrimersHematopoiesisBody PatterningZebrafishPromoter Regions, GeneticMultipotent Stem CellsEctodermCell Culture TechniquesGenetic VectorsEmbryonic DevelopmentSequence Analysis, DNACell CycleTime FactorsLymphopoiesisEpithelial CellsLasersLaser Capture MicrodissectionCaenorhabditis elegans ProteinsMosaicismReceptors, NotchPolymerase Chain ReactionMicroscopy, FluorescenceUrochordataSpecies SpecificityTrans-ActivatorsAntigens, CDRegenerationLuminescent ProteinsReceptors, Cell SurfaceGenes, ReporterBlastomeresCentral Nervous SystemRecombinant Fusion ProteinsFluorescent Antibody TechniqueLentivirusAntigens, SurfaceMembrane ProteinsRepressor ProteinsApoptosis