Clone CellsCell LineageCell DifferentiationMolecular Sequence DataEmbryo, NonmammalianEmbryo, MammalianBase SequenceGene Expression Regulation, DevelopmentalAmino Acid SequenceStem CellsCell LineCells, CulturedCloning, MolecularBlastocystEmbryonic Stem CellsPhylogenyEmbryonic DevelopmentCell DivisionT-LymphocytesTranscription FactorsRNA, MessengerBlastomeresMice, TransgenicPhenotypeGastrulaMice, Inbred C57BLChimeraDNACaenorhabditis elegansEndodermMesodermB-LymphocytesSignal TransductionMutationLymphocyte ActivationMorphogenesisGene Expression RegulationReceptors, Antigen, T-Cell, alpha-betaHomeodomain ProteinsCell AggregationHematopoietic Stem CellsDNA-Binding ProteinsDNA, ComplementaryGene ExpressionChick EmbryoXenopus ProteinsTranscription, GeneticPolymerase Chain ReactionIn Situ HybridizationGerm CellsSequence Analysis, DNAFlow CytometryUrochordataEctodermTransfectionReceptors, Antigen, T-CellVitellinsDNA PrimersT-Lymphocytes, Helper-InducerMitosisCD4-Positive T-LymphocytesCaenorhabditis elegans ProteinsZebrafishReverse Transcriptase Polymerase Chain ReactionMice, KnockoutCell CycleSequence Homology, Amino AcidPluripotent Stem CellsThymus GlandSpecies SpecificityTime FactorsXenopusTeratomaXenopus laevisTumor Cells, CulturedNeural CrestGreen Fluorescent ProteinsBody PatterningImmunohistochemistryModels, BiologicalEvolution, MolecularCell MovementAntibodies, MonoclonalT-Lymphocyte SubsetsOctamer Transcription Factor-3OvumNuclear ProteinsEpitopesCleavage Stage, OvumDrosophila ProteinsGenes, T-Cell Receptor betaEmbryonic and Fetal DevelopmentCell ProliferationFluorescent Antibody TechniqueBlotting, SouthernPromoter Regions, GeneticNucleic Acid HybridizationCell Culture TechniquesCarcinoma, EmbryonalOocytes