Embryo, NonmammalianEmbryo, MammalianEmbryonic DevelopmentChick EmbryoGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentEmbryo ImplantationBlastocystPlant Somatic Embryogenesis TechniquesIn Situ HybridizationZebrafishEmbryo LossMorphogenesisMolecular Sequence DataBody PatterningGastrulaBlastomeresMesodermZygoteSeedsZebrafish ProteinsCleavage Stage, OvumPregnancyDrosophila ProteinsTranscription FactorsHomeodomain ProteinsAmino Acid SequenceDrosophilaXenopus ProteinsFertilization in VitroBase SequenceEctodermNervous SystemOocytesRNA, MessengerBlastodermEndodermMorulaDrosophila melanogasterCell DifferentiationGenes, HomeoboxXenopus laevisOogenesisMutationPhenotypeAnimals, Genetically ModifiedEmbryonic InductionGenes, LethalGenes, InsectSequence Homology, Amino AcidSea UrchinsCloning, MolecularEmbryo DispositionDNA-Binding ProteinsXenopusCaenorhabditis elegansSignal TransductionDNA, ComplementaryCulture TechniquesUrochordataSomitesCryopreservationGerm CellsInsect ProteinsLarvaYolk SacGene ExpressionNotochordTime FactorsNeural CrestCell LineageOvumCentral Nervous SystemFertilizationCaenorhabditis elegans ProteinsCloning, OrganismChimeraEctogenesisTranscription, GeneticMicroinjectionsGastrulationEmbryo ResearchOrganogenesisSingle Embryo TransferImmunohistochemistryDNA PrimersTrans-ActivatorsGene Expression Regulation, PlantNuclear ProteinsBone Morphogenetic ProteinsExtremitiesTissue DistributionStem CellsReverse Transcriptase Polymerase Chain ReactionFetal ViabilityNuclear Transfer TechniquesParthenogenesisWnt ProteinsSequence AlignmentNodal Protein