GastrulationGastrulaEmbryo, NonmammalianEmbryo, MammalianChick EmbryoGene Expression Regulation, DevelopmentalMesodermBody PatterningZebrafishXenopus ProteinsEctodermEndodermZebrafish ProteinsEmbryonic DevelopmentMorphogenesisIn Situ HybridizationBlastocystEmbryo ImplantationEmbryonic InductionEmbryonic and Fetal DevelopmentXenopus laevisXenopusNotochordBlastomeresNodal ProteinGerm LayersFetal ProteinsBlastodermEmbryo LossBlastulaHomeodomain ProteinsNervous SystemOrganizers, EmbryonicWnt ProteinsBone Morphogenetic ProteinsZygoteCleavage Stage, OvumT-Box Domain ProteinsMolecular Sequence DataPrimitive StreakSea UrchinsGoosecoid ProteinSignal TransductionCell MovementPleurodelesTranscription FactorsDrosophila ProteinsDrosophilaAmino Acid SequencePregnancyFertilization in VitroSomitesActivinsCell DifferentiationBase SequenceNodal Signaling LigandsGenes, HomeoboxCell LineagePhenotypeFibroblast Growth FactorsRNA, MessengerMicroinjectionsCell PolarityAnimals, Genetically ModifiedLeft-Right Determination FactorsBone Morphogenetic Protein 4Sequence Homology, Amino AcidMutationCulture TechniquesUrochordataChimeraHeadOtx Transcription FactorsTailEmbryo DispositionNeural CrestOocytesDNA-Binding ProteinsMorulaModels, BiologicalProteinsNeural PlateMorpholinosOligonucleotides, AntisenseIntercellular Signaling Peptides and ProteinsAvian ProteinsCentral Nervous SystemTime FactorsQuailCryopreservationCloning, MolecularTolloid-Like MetalloproteinasesDrosophila melanogasterTransforming Growth Factor betaGenes, LethalCadherinsRhombencephalonLytechinusFibroblast Growth Factor 8Neurulation