Organizers, EmbryonicGoosecoid ProteinNucleolus Organizer RegionGastrulaNotochordBody PatterningEmbryonic InductionZebrafishZebrafish ProteinsMesodermGastrulationHoloprosencephalyProsencephalonEndodermNodal ProteinGene Expression Regulation, DevelopmentalXenopus ProteinsIn Situ HybridizationEmbryo, NonmammalianHeadEctodermHomeodomain ProteinsNervous SystemMorphogenesisXenopusBone Morphogenetic ProteinsChick EmbryoHedgehog ProteinsOtx Transcription FactorsGrowth PlateBone PlatesTranscription FactorsRepressor ProteinsProteinsSequence Homology, Amino AcidSignal TransductionSilver StainingFetal ProteinsMolecular Sequence DataIntercellular Signaling Peptides and ProteinsEmbryologyAmino Acid SequenceGenes, HomeoboxDNA-Binding ProteinsQuailDiencephalonT-Box Domain ProteinsBone Morphogenetic Protein 4CoturnixBone Morphogenetic Protein 7Fibroblast Growth Factor 8Neural CrestNeural PlateRhombencephalonTrans-ActivatorsTransforming Growth Factor betaEmbryonic DevelopmentCentral Nervous SystemMesencephalonHydraWnt ProteinsXenopus laevisSkullAxisNodal Signaling LigandsPaired Box Transcription FactorsTissue TransplantationLIM-Homeodomain ProteinsSilverNerve Tissue ProteinsRNA, MessengerCell NucleolusLeft-Right Determination FactorsWnt1 ProteinCell MovementActivinsImmunohistochemistryMetencephalonBlastulaFibroblast Growth FactorsGlycoproteinsMicroscopy, Electron, ScanningBlastodermTwins, ConjoinedHepatocyte Nuclear Factor 3-betaMatrix Attachment Region Binding ProteinsSilver Nitratebeta CateninAmphibiansTectum MesencephaliInhibinsStaining and LabelingChromosomesMicroinjectionsCell DifferentiationNeural TubeDrug PackagingVertebratesBlastomeresTail