Organizers, EmbryonicNucleolus Organizer RegionRegenerationGoosecoid ProteinNerve RegenerationLiver RegenerationBody PatterningEmbryonic InductionGastrulaXenopus ProteinsSilver StainingGene Expression Regulation, DevelopmentalEmbryologyZebrafish ProteinsBone RegenerationEmbryo, NonmammalianOtx Transcription FactorsHomeodomain ProteinsMesodermXenopusZebrafishHydraFibroblast Growth Factor 8In Situ HybridizationRhombencephalonNodal ProteinWnt ProteinsHeadNotochordIntercellular Signaling Peptides and ProteinsTissue TransplantationBone Morphogenetic ProteinsMesencephalonXenopus laevisAxisNodal Signaling LigandsEctodermMorphogenesisNervous SystemLIM-Homeodomain ProteinsSignal TransductionGuided Tissue RegenerationSilverCell NucleolusGenes, HomeoboxTranscription FactorsWnt1 ProteinActivinsTailLeft-Right Determination FactorsEndodermCell DifferentiationFibroblast Growth FactorsMetencephalonProteinsMolecular Sequence DataFetal ProteinsT-Box Domain ProteinsGlycoproteinsPlanariansBlastulaExtremitiesHepatectomyChick EmbryoBone Morphogenetic Protein 4AmphibiansStem Cellsbeta CateninTwins, ConjoinedBlastodermTransforming Growth Factor betaAxonsMatrix Attachment Region Binding ProteinsSalamandridaeAmino Acid SequenceCentral Nervous SystemNerve Tissue ProteinsAmbystoma mexicanumRNA, MessengerSilver NitrateRepressor ProteinsHedgehog ProteinsAnimals, Genetically ModifiedCell LineageTime FactorsNerve CrushTrans-ActivatorsTectum MesencephaliHepatocyte Nuclear Factor 3-betaInhibinsCell ProliferationVertebratesStaining and LabelingModels, BiologicalNotophthalmus viridescensNeural PlateImmunohistochemistryDNA-Binding ProteinsDrug PackagingAnimal Fins