Organizers, EmbryonicNucleolus Organizer RegionGoosecoid ProteinBody PatterningEmbryonic InductionCell LineageGene Expression Regulation, DevelopmentalGastrulaXenopus ProteinsEmbryo, NonmammalianCell DifferentiationHomeodomain ProteinsSilver StainingMesodermZebrafish ProteinsOtx Transcription FactorsSignal TransductionEmbryologyMorphogenesisEctodermIn Situ HybridizationXenopusReceptors, NotchWnt ProteinsTranscription FactorsDrosophila ProteinsZebrafishNodal ProteinNotochordBone Morphogenetic ProteinsNervous SystemDrosophilaFibroblast Growth Factor 8Stem CellsRhombencephalonIntercellular Signaling Peptides and ProteinsEndodermVulvaXenopus laevisGenes, HomeoboxLIM-Homeodomain ProteinsWnt1 ProteinMesencephalonNodal Signaling LigandsHydraHeadRepressor ProteinsMolecular Sequence DataBasic Helix-Loop-Helix Transcription FactorsAxisModels, BiologicalDNA-Binding ProteinsTissue TransplantationMutationAnimals, Genetically ModifiedT-Box Domain ProteinsNerve Tissue ProteinsActivinsCaenorhabditis elegansCaenorhabditis elegans ProteinsTrans-ActivatorsReceptor, Notch1beta CateninBlastomeresChick EmbryoHedgehog ProteinsFibroblast Growth FactorsMembrane ProteinsSilverAmino Acid SequenceBone Morphogenetic Protein 4PhenotypeNeural PlateLeft-Right Determination FactorsCell NucleolusProteinsEmbryonic DevelopmentJuvenile HormonesFetal ProteinsCentral Nervous SystemWingBlastodermDrosophila melanogasterEmbryo, MammalianBlastulaGenes, InsectTransforming Growth Factor betaBase SequenceNuclear ProteinsGlycoproteinsNeuronsCell PolarityMetencephalonRNA, MessengerInsect ProteinsMice, TransgenicSense OrgansEyePAX2 Transcription FactorCell Proliferation