Embryo ResearchCloning, OrganismClone CellsMolecular Sequence DataCloning, MolecularBase SequenceAmino Acid SequenceEmbryo, NonmammalianEmbryo, MammalianCell LineGene Expression Regulation, DevelopmentalRNA, MessengerBlastocystCell DifferentiationDNA, ComplementaryDNAEmbryonic DevelopmentSequence Homology, Amino AcidCells, CulturedT-LymphocytesCell DivisionCell AggregationGastrulaLymphocyte ActivationTranscription, GeneticEmbryonic Stem CellsMutationVitellinsBlastomeresPolymerase Chain ReactionXenopus ProteinsNucleic Acid HybridizationBlotting, SouthernGene ExpressionPhenotypeRecombinant ProteinsXenopus laevisChick EmbryoXenopusCaenorhabditis elegansReceptors, Antigen, T-Cell, alpha-betaSequence Analysis, DNADNA PrimersCell LineageEpitopesPlasmidsTransfectionNuclear Transfer TechniquesMitosisOocytesSequence AlignmentSequence Homology, Nucleic AcidTranscription FactorsReceptors, Antigen, T-CellT-Lymphocytes, Helper-InducerGenetic VectorsGene Expression RegulationGenesTeratomaTumor Cells, CulturedOvumGenes, BacterialCarcinoma, EmbryonalChimeraCell CycleEscherichia coliCD4-Positive T-LymphocytesChromosome MappingBlotting, NorthernTeratocarcinomaAntibodies, MonoclonalGenes, T-Cell Receptor betaBlastulaDNA Restriction EnzymesDNA-Binding ProteinsB-LymphocytesStem CellsEmbryonal Carcinoma Stem CellsEndodermCleavage Stage, OvumPromoter Regions, GeneticIn Situ HybridizationCaenorhabditis elegans ProteinsMice, Inbred C57BLReverse Transcriptase Polymerase Chain ReactionDNA, RecombinantEpitopes, T-LymphocyteSignal TransductionTime FactorsCell NucleusRetroviridaeMorphogenesisPhylogenyZebrafishDNA, ViralCDC2 Protein KinaseStarfishT-Lymphocytes, CytotoxicSea UrchinsHLA-DR Antigens