Cell LineageCell DifferentiationPhylogenyStem CellsGene Expression Regulation, DevelopmentalMolecular Sequence DataMice, TransgenicTranscription FactorsHematopoietic Stem CellsEvolution, MolecularMice, Inbred C57BLBase SequenceHomeodomain ProteinsCells, CulturedPhenotypeBiological EvolutionThymus GlandEmbryonic Stem CellsGerm CellsMice, KnockoutMesodermSignal TransductionSequence Analysis, DNAEmbryo, MammalianSpecies SpecificityBasic Helix-Loop-Helix Transcription FactorsGene Expression RegulationFlow CytometryB-LymphocytesHematopoiesisChimeraModels, BiologicalDNA-Binding ProteinsEmbryo, NonmammalianMorphogenesisBone Marrow CellsGenetic VariationMultipotent Stem CellsEndodermEctodermIn Situ HybridizationLymphopoiesisCell DivisionAmino Acid SequenceMutationCell LineReceptors, NotchRNA, MessengerImmunohistochemistryUrochordataGene ExpressionT-LymphocytesClone CellsBlastomeresTime FactorsCell ProliferationEmbryonic DevelopmentReverse Transcriptase Polymerase Chain ReactionBody PatterningCell SeparationGreen Fluorescent ProteinsEnteroendocrine CellsDNA PrimersPolymerase Chain ReactionCaenorhabditis elegansNeural CrestPluripotent Stem CellsIntegrasesGerm LayersGene Expression ProfilingZebrafishBlastocystTrophoblastsOrgan SpecificityTranscription, GeneticModels, GeneticAnimals, Genetically ModifiedTrans-ActivatorsDrosophila ProteinsDrosophilaNeuronsTransgenesDNA, MitochondrialBiological MarkersPan troglodytesPrecursor Cells, T-LymphoidGenotypeGenes, ReporterMice, Mutant StrainsRegenerationPromoter Regions, GeneticBlastocyst Inner Cell MassVulvaReceptor, Notch1Sequence AlignmentPaneth CellsEpithelial CellsMosaicismHominidaeT-Lymphocyte Subsets