Embryo, NonmammalianEmbryo, MammalianBlastocystEmbryonic DevelopmentGene Expression Regulation, DevelopmentalVitellinsGastrulaCell AggregationBlastomeresXenopus ProteinsEmbryonic Stem CellsCell DifferentiationCaenorhabditis elegansChick EmbryoTeratomaCarcinoma, EmbryonalXenopusMitosisXenopus laevisOvumCell LineageTeratocarcinomaBlastulaMolecular Sequence DataCleavage Stage, OvumEndodermEmbryonal Carcinoma Stem CellsOocytesCaenorhabditis elegans ProteinsCells, CulturedNuclear Transfer TechniquesCell CycleCDC2 Protein KinaseStarfishCell DivisionMorphogenesisCell LineTranscription FactorsZebrafishDipteraOctamer Transcription Factor-3Sea UrchinsZygoteQuailIridovirusEmbryonic and Fetal DevelopmentUrochordataTotipotent Stem CellsBase SequenceFertilizationSalamandridaeGastrulationEctodermMesodermInsect Hormonescdc25 PhosphatasesPluripotent Stem CellsAmino Acid SequenceCoturnixRNA, MessengerCell NucleusChimeraCell Cycle ProteinsStem CellsNeural CrestIn Situ HybridizationCyclin BPleurodelesMorulaBlastodermGerm CellsNuclear ProteinsNotochordBody PatterningCell MovementSignal TransductionDNA-Binding ProteinsZebrafish ProteinsTranscription, GeneticEmbryo LossAnimals, Genetically ModifiedGenes, HelminthDNATime FactorsTrophoblastsPregnancyDrosophila ProteinsCell AdhesionEmbryonic InductionHomeodomain ProteinsMutationDrosophilaHelminth ProteinsDrosophila melanogasterCloning, MolecularFetal ProteinsS PhaseActivinsFibroblastsGene Expression Regulation