MorphogenesisEmbryo, NonmammalianEmbryo, MammalianGene Expression Regulation, DevelopmentalChick EmbryoEmbryonic DevelopmentBlastocystEmbryo ImplantationEmbryonic and Fetal DevelopmentZygoteBody PatterningIn Situ HybridizationBlastomeresMesodermOocytesCleavage Stage, OvumZebrafishGastrulaMolecular Sequence DataDrosophila ProteinsEmbryo LossPregnancyDrosophilaFertilization in VitroXenopus ProteinsHomeodomain ProteinsZebrafish ProteinsTranscription FactorsEctodermAmino Acid SequenceMutationSignal TransductionMorulaCell DifferentiationCaenorhabditis elegansBase SequenceDrosophila melanogasterAnimals, Genetically ModifiedOogenesisCell PolarityCaenorhabditis elegans ProteinsRNA, MessengerXenopus laevisPhenotypeEndodermEpitheliumEmbryonic InductionFertilizationOrganogenesisModels, BiologicalRNA, Messenger, StoredOvumXenopusCulture TechniquesGerm CellsGenes, InsectSequence Homology, Amino AcidBlastodermNervous SystemBone Morphogenetic ProteinsEctogenesisNotochordDNA-Binding ProteinsEpithelial CellsImmunohistochemistryGenes, HomeoboxSea UrchinsGastrulationEmbryologyTime FactorsCell MovementCell DivisionEmbryo Culture TechniquesCloning, MolecularMicroinjectionsExtremitiesFibroblast Growth FactorsWnt ProteinsParthenogenesisCryopreservationLarvaUreterNeural CrestGene ExpressionCell NucleusEmbryo DispositionCell LineageOrgan Culture TechniquesMice, Inbred ICRBlastulaDNA, ComplementaryGenes, LethalActinsNuclear Transfer TechniquesDevelopmental BiologySeedsMice, TransgenicMicroscopy, ElectronInsect ProteinsMitosis