EctodermSea UrchinsEmbryo, NonmammalianGene Expression Regulation, DevelopmentalMolecular Sequence DataBase SequenceEmbryonic InductionGastrulaMesodermBody PatterningNervous SystemEndodermXenopus ProteinsMorphogenesisIn Situ HybridizationChick EmbryoBone Morphogenetic ProteinsNeural 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, Homeobox