Cloning, OrganismClone CellsNuclear Transfer TechniquesCloning, MolecularMolecular Sequence DataBase SequenceAmino Acid SequenceEmbryo, NonmammalianDNA, ComplementaryEmbryo, MammalianSequence Homology, Amino AcidCell LineRNA, MessengerDNAGene Expression Regulation, DevelopmentalCell DifferentiationBlastocystEmbryonic DevelopmentCells, CulturedT-LymphocytesCell DivisionPolymerase Chain ReactionSequence AlignmentGene ExpressionBlotting, SouthernTransfectionRecombinant ProteinsSequence Analysis, DNASequence Homology, Nucleic AcidCell AggregationGastrulaXenopus ProteinsEmbryonic Stem CellsLymphocyte ActivationVitellinsTranscription, GeneticBlastomeresNucleic Acid HybridizationMutationDNA PrimersBlotting, NorthernChromosome MappingPhenotypeGenetic VectorsXenopus laevisXenopusCaenorhabditis elegansChick EmbryoPlasmidsReceptors, Antigen, T-Cell, alpha-betaEscherichia coliGenes, BacterialCell LineageEpitopesTranscription FactorsMitosisReceptors, Antigen, T-CellTumor Cells, CulturedOocytesGenesTeratomaGene Expression RegulationT-Lymphocytes, Helper-InducerRestriction MappingCarcinoma, EmbryonalOvumIn Situ HybridizationCell CyclePhylogenyCD4-Positive T-LymphocytesChimeraTeratocarcinomaDNA-Binding ProteinsAntibodies, MonoclonalReverse Transcriptase Polymerase Chain ReactionGenes, T-Cell Receptor betaBlastulaGene Library