Organizers, EmbryonicNucleolus Organizer RegionGoosecoid ProteinBody PatterningEmbryonic InductionGastrulaXenopus ProteinsSilver StainingGene Expression Regulation, DevelopmentalEmbryologyOtx Transcription FactorsEmbryo, NonmammalianZebrafish ProteinsHomeodomain ProteinsMesodermXenopusFibroblast Growth Factor 8Nodal ProteinRhombencephalonNotochordZebrafishHydraIn Situ HybridizationMesencephalonAxisNodal Signaling LigandsWnt ProteinsHeadIntercellular Signaling Peptides and ProteinsBone Morphogenetic ProteinsXenopus laevisEctodermTissue TransplantationMorphogenesisNervous SystemLIM-Homeodomain ProteinsSilverCell NucleolusTranscription FactorsGenes, HomeoboxSignal TransductionWnt1 ProteinActivinsLeft-Right Determination FactorsEndodermMolecular Sequence DataMetencephalonT-Box Domain ProteinsFetal ProteinsBlastulaProteinsMutationGlycoproteinsFibroblast Growth FactorsTwins, ConjoinedBlastodermAmino Acid SequenceBone Morphogenetic Protein 4Matrix Attachment Region Binding ProteinsChick EmbryoRepressor ProteinsSilver NitrateTransforming Growth Factor betabeta CateninHepatocyte Nuclear Factor 3-betaAmphibiansInhibinsDNA-Binding ProteinsTectum MesencephaliHedgehog ProteinsPhenotypeBase SequenceNeural PlateNerve Tissue ProteinsProsencephalonTrans-ActivatorsChromosomesHeart Septal Defects, VentricularDrug PackagingCentral Nervous SystemMicroinjectionsStaining and LabelingRNA, MessengerCarrier ProteinsHeart Defects, CongenitalEmbryonic DevelopmentTailBlastomeresCell DifferentiationCytoskeletal ProteinsVertebratesSequence Homology, Amino AcidHeart Septal Defects, AtrialChordataFollistatinDrosophila ProteinsModels, BiologicalGenes, DevelopmentalAnimals, Genetically ModifiedDNA, Ribosomal