EctodermMorulaSea UrchinsGastrulaEmbryonic InductionEndodermGene Expression Regulation, DevelopmentalMesodermBlastocystXenopusEmbryonic DevelopmentEmbryonic and Fetal DevelopmentEmbryo, MammalianCleavage Stage, OvumZygoteEmbryo Culture TechniquesBlastomeresEmbryo, NonmammalianCloning, OrganismBody PatterningOocytesEmbryo TransferFertilization in VitroNervous SystemXenopus ProteinsMorphogenesisCulture TechniquesPregnancyIn Situ HybridizationChick EmbryoParthenogenesisVitrificationBone Morphogenetic ProteinsFetal ViabilityNeural CrestBone Morphogenetic Protein 4ChimeraFallopian TubesHomeodomain ProteinsGerm LayersCell DifferentiationEmbryo ImplantationTranscription FactorsNeural PlateBlastulaXenopus laevisEmbryonic StructuresCattleExtremitiesFibroblast Growth Factor 8Fibroblast Growth FactorsCryopreservationGastrulationOctamer Transcription Factor-3Limb BudsCulture MediaMolecular Sequence DataTissue TransplantationTrophoblastsOvum