Cloning, OrganismNuclear Transfer TechniquesClone CellsCloning, MolecularMolecular Sequence DataBase SequenceAmino Acid SequenceEmbryo, NonmammalianDNA, ComplementaryEmbryo, MammalianSequence Homology, Amino AcidGene Expression Regulation, DevelopmentalDNABlastocystRNA, MessengerEmbryonic DevelopmentCell LineSequence AlignmentCell DifferentiationCell AggregationGastrulaXenopus ProteinsVitellinsBlastomeresSequence Homology, Nucleic AcidEmbryonic Stem CellsSequence Analysis, DNAPolymerase Chain ReactionGene ExpressionNucleic Acid HybridizationXenopus laevisXenopusCaenorhabditis elegansBlotting, SouthernChick EmbryoBlotting, NorthernChromosome MappingCells, CulturedEscherichia coliGenes, BacterialTranscription, GeneticDNA PrimersRecombinant ProteinsOocytesMutationTeratomaCell DivisionMitosisPlasmidsTranscription FactorsCarcinoma, EmbryonalCell LineageOvumPhylogenyTeratocarcinomaGenesIn Situ HybridizationRestriction MappingBlastula