Gene Expression Regulation, DevelopmentalBody PatterningCell LineageCesarean SectionHomeodomain ProteinsEmbryo, NonmammalianCell DifferentiationTranscription FactorsFrozen SectionsIn Situ HybridizationMesodermEndodermZebrafish ProteinsReceptors, NotchZebrafishEctodermDrosophila ProteinsMorphogenesisEmbryonic InductionBasic Helix-Loop-Helix Transcription FactorsSignal TransductionStem CellsDrosophilaGastrulaGenes, HomeoboxXenopus ProteinsBone Morphogenetic ProteinsLIM-Homeodomain ProteinsNodal ProteinWnt ProteinsAnimals, Genetically ModifiedHedgehog ProteinsNerve Tissue ProteinsChick EmbryoModels, BiologicalEmbryonic Stem CellsMutationNeural PlateMolecular Sequence DataDNA-Binding ProteinsNeuronsT-Box Domain ProteinsNeural CrestImmunohistochemistryEmbryonic DevelopmentBlastomeresNotochordBone Morphogenetic Protein 4EyeOrganogenesisPhenotypeOtx Transcription FactorsVulvaGastrulationTrans-ActivatorsRepressor ProteinsCaenorhabditis elegansGATA Transcription FactorsPaired Box Transcription FactorsGenes, InsectCaenorhabditis elegans ProteinsRhombencephalonDrosophila melanogasterSea UrchinsGerm CellsEmbryo, MammalianNeurogenesisNervous SystemFibroblast Growth FactorsWnt1 ProteinStrongylocentrotus purpuratusPhotoreceptor Cells, InvertebrateTelencephalonXenopusLarvaGerm LayersBase SequenceEye ProteinsCentral Nervous SystemAvian ProteinsSOXF Transcription FactorsAmino Acid SequenceMorpholinosSense OrgansMicrotomyFetal ProteinsMice, TransgenicWingInsect Proteinsbeta CateninHistological TechniquesMembrane ProteinsTime FactorsBlastulaRNA, MessengerProsencephalonNuclear ProteinsCell PolarityUrochordataCompound Eye, Arthropod