Nodal ProteinOrganizers, EmbryonicNodal Signaling LigandsLeft-Right Determination FactorsNucleolus Organizer RegionGene Expression Regulation, DevelopmentalGoosecoid ProteinBody PatterningEmbryonic InductionGastrulaXenopus ProteinsSilver StainingEmbryologyOtx Transcription FactorsEmbryo, NonmammalianZebrafish ProteinsHomeodomain ProteinsXenopusMesodermFibroblast Growth Factor 8RhombencephalonNotochordHydraMesencephalonAxisZebrafishIntercellular Signaling Peptides and ProteinsWnt ProteinsHeadIn Situ HybridizationEctodermXenopus laevisBone Morphogenetic ProteinsTissue TransplantationNervous SystemLIM-Homeodomain ProteinsMorphogenesisSilverCell NucleolusGenes, HomeoboxWnt1 ProteinActivinsTranscription FactorsEndodermSignal TransductionMetencephalonBlastulaFetal ProteinsT-Box Domain ProteinsGlycoproteinsProteinsTwins, ConjoinedFibroblast Growth FactorsBlastodermMatrix Attachment Region Binding ProteinsBone Morphogenetic Protein 4Chick EmbryoMolecular Sequence DataSilver Nitratebeta CateninHepatocyte Nuclear Factor 3-betaAmphibiansTransforming Growth Factor betaRepressor ProteinsInhibinsTectum MesencephaliAmino Acid SequenceNeural PlateTrans-ActivatorsDrug PackagingHedgehog ProteinsProsencephalon