EctodermEmbryonic InductionGastrulaMesodermGene Expression Regulation, DevelopmentalEmbryo, NonmammalianBody PatterningNervous SystemEndodermXenopus ProteinsMorphogenesisIn Situ HybridizationChick EmbryoBone Morphogenetic ProteinsSea UrchinsNeural CrestBone Morphogenetic Protein 4Homeodomain ProteinsGerm LayersXenopusNeural PlateBlastulaXenopus laevisEmbryonic StructuresExtremitiesFibroblast Growth Factor 8Fibroblast Growth FactorsGastrulationCell DifferentiationLimb BudsTranscription FactorsTissue TransplantationQuailSignal TransductionNotochordWnt ProteinsLens, CrystallinePaired Box Transcription FactorsOtx Transcription FactorsGenes, HomeoboxZebrafish ProteinsNodal ProteinBranchial RegionEmbryonic and Fetal DevelopmentChimeraHedgehog ProteinsEmbryonic DevelopmentHeadCell LineageEmbryo, MammalianCentral Nervous SystemTriturusMolecular Sequence DataStrongylocentrotus purpuratusBone Morphogenetic Protein ReceptorsSOXB1 Transcription FactorsTrans-ActivatorsEpidermisOrganizers, EmbryonicSomitesDrosophila ProteinsDrosophilaFibroblast Growth Factor 4HMGB ProteinsDNA-Binding ProteinsZebrafishChordata, NonvertebrateActivinsBlastocystMSX1 Transcription FactorBase SequenceBlastodermFetal ProteinsProteinsAmino Acid SequenceRepressor ProteinsRhombencephalonNeural TubeLimb Deformities, CongenitalWnt1 ProteinModels, BiologicalCulture TechniquesT-Box Domain ProteinsNerve Tissue ProteinsEyeRNA, MessengerNodal Signaling LigandsPleurodelesCoturnixAxisWnt3 ProteinHemicentrotusGoosecoid ProteinBone Morphogenetic Protein 2LIM-Homeodomain ProteinsFeathersBone Morphogenetic Protein 7ProsencephalonGenes, InsectAmphibians