EctodermEmbryonic StructuresGene Expression Regulation, DevelopmentalBody PatterningEmbryo, NonmammalianMesodermEmbryo, MammalianZebrafishIn Situ HybridizationEmbryonic InductionGastrulaNervous SystemEndodermMorphogenesisXenopus ProteinsChick EmbryoBone Morphogenetic ProteinsSea UrchinsHomeodomain ProteinsNeural CrestBone Morphogenetic Protein 4Tissue and Organ ProcurementOrgan TransplantationGerm LayersXenopusXenopus laevisNeural PlateBlastulaExtremitiesFibroblast Growth FactorsFibroblast Growth Factor 8Cell DifferentiationTranscription FactorsGastrulationSignal TransductionTissue TransplantationLimb BudsQuailWnt ProteinsGenes, HomeoboxLens, CrystallineMultiple Organ FailurePaired Box Transcription FactorsNotochordOrgan SpecificityOtx Transcription FactorsZebrafish ProteinsMolecular Sequence DataEmbryonic and Fetal DevelopmentNodal ProteinChimeraOrgan SizeEmbryonic DevelopmentBranchial RegionHedgehog ProteinsOrgan of CortiCell LineageHeadCentral Nervous SystemDrosophila ProteinsTriturusDrosophilaBone Morphogenetic Protein ReceptorsEpidermisStrongylocentrotus purpuratusSOXB1 Transcription FactorsTrans-ActivatorsSomitesOrganizers, EmbryonicBase SequenceAmino Acid SequenceDNA-Binding ProteinsModels, BiologicalFibroblast Growth Factor 4HMGB ProteinsRNA, MessengerProteinsChordata, NonvertebrateActivinsRepressor ProteinsFetal ProteinsMSX1 Transcription FactorBlastocystBlastodermCulture TechniquesEyeTime FactorsRhombencephalonImmunohistochemistryNeural TubeTissue DistributionWnt1 ProteinNerve Tissue ProteinsLimb Deformities, CongenitalMicroscopy, Electron, ScanningEar, InnerEpitheliumT-Box Domain ProteinsSequence Homology, Amino AcidGene Expression