Organizers, EmbryonicNucleolus Organizer RegionZebrafish ProteinsGoosecoid ProteinBody PatterningEmbryo, NonmammalianEmbryonic InductionGene Expression Regulation, DevelopmentalGastrulaXenopus ProteinsSilver StainingEmbryologyHomeodomain ProteinsOtx Transcription FactorsIn Situ HybridizationMesodermRhombencephalonAnimals, Genetically ModifiedNotochordXenopusFibroblast Growth Factor 8Nodal Signaling LigandsMorphogenesisWnt ProteinsNodal ProteinMesencephalonBone Morphogenetic ProteinsHydraIntercellular Signaling Peptides and ProteinsHeadNervous SystemEctodermAxisZebrafishXenopus laevisLIM-Homeodomain ProteinsMolecular Sequence DataTissue TransplantationSignal TransductionTranscription FactorsSilverGenes, HomeoboxBlastulaEndodermLeft-Right Determination FactorsCell NucleolusAmino Acid SequenceT-Box Domain ProteinsWnt1 ProteinMorpholinosLarvaEmbryonic DevelopmentFibroblast Growth FactorsActivinsSomitesMetencephalonFetal ProteinsMutationBlastodermProteinsHedgehog ProteinsGlycoproteinsBone Morphogenetic Protein 4Base SequenceMicroinjectionsSequence Homology, Amino AcidTrans-ActivatorsTwins, ConjoinedTailbeta CateninChick EmbryoVertebratesRNA, MessengerCentral Nervous SystemNerve Tissue ProteinsRepressor ProteinsProsencephalonMatrix Attachment Region Binding ProteinsGene Knockdown TechniquesPhenotypeCell DifferentiationNeural PlateGastrulationSilver NitrateHepatocyte Nuclear Factor 3-betaCloning, MolecularDNA-Binding ProteinsAmphibiansAnimal FinsGreen Fluorescent ProteinsTectum MesencephaliCell LineageOligonucleotides, AntisensePAX2 Transcription FactorTransforming Growth Factor betaLateral Line SystemInhibinsDiencephalonModels, BiologicalBlastomeres