Aborted FetusNeural PlateNeural CrestEctodermNeurulationNervous SystemNeural TubeXenopus ProteinsVocal CordsGene Expression Regulation, DevelopmentalEmbryo, NonmammalianEmbryonic InductionChick EmbryoPhonationGastrulaIn Situ HybridizationProtein FoldingBody PatterningCentral Nervous SystemMorphogenesisNeural Tube DefectsNotochordMolecular Sequence DataHomeodomain ProteinsMesodermXenopusAmino Acid SequenceXenopus laevisProteinsGrowth PlateRhombencephalonBone PlatesAmbystoma mexicanumSkullQuailModels, MolecularTranscription FactorsProsencephalonBone Morphogenetic ProteinsZebrafish ProteinsZebrafishProtein Structure, TertiaryMesencephalonEmbryonic StructuresAmbystomaHeadOtx Transcription FactorsGenes, HomeoboxMicroscopy, Electron, ScanningEmbryo, MammalianProtein ConformationDatabases, Protein