GastrulaEmbryo, NonmammalianEmbryo, MammalianChick EmbryoXenopus ProteinsGene Expression Regulation, DevelopmentalEctodermOrganizers, EmbryonicBlastocystMesodermEmbryo ImplantationEmbryonic InductionBody PatterningEmbryonic DevelopmentGoosecoid ProteinXenopus laevisZebrafishBlastulaGastrulationXenopusIn Situ HybridizationEndodermBlastomeresZebrafish ProteinsMorphogenesisNervous SystemSea UrchinsEmbryonic and Fetal DevelopmentPleurodelesHomeodomain ProteinsCleavage Stage, OvumEmbryo LossBone Morphogenetic ProteinsZygoteFertilization in VitroMolecular Sequence DataT-Box Domain ProteinsFetal ProteinsBlastodermTranscription FactorsNodal ProteinPregnancyGenes, HomeoboxTriturusUrochordataOtx Transcription FactorsGerm LayersMicroinjectionsAmino Acid SequenceOocytesBase SequenceSomitesEmbryo DispositionEmbryologyActivinsMorulaCulture TechniquesRNA, MessengerSignal TransductionFibroblast Growth FactorsCryopreservationNeural CrestCell LineageKillifishesCell DifferentiationTissue TransplantationCloning, MolecularCentral Nervous SystemSequence Homology, Amino AcidBone Morphogenetic Protein 4TailPrimitive StreakDNA-Binding ProteinsSOXF Transcription FactorsAnimals, Genetically ModifiedRhombencephalonDNA, ComplementaryOvumEmbryo ResearchSingle Embryo TransferChordataCloning, OrganismTime FactorsDrosophilaLarvaProteinsEctogenesisChordata, NonvertebrateCell MovementTrans-ActivatorsNuclear Transfer TechniquesRepressor ProteinsNeural PlateDrosophila ProteinsPregnancy RateMutationPhenotypeHeadGene ExpressionIntercellular Signaling Peptides and Proteins