Cell LineageGene Expression Regulation, DevelopmentalCell DifferentiationBody PatterningHomeodomain ProteinsEmbryo, NonmammalianReceptors, NotchTranscription FactorsDrosophila ProteinsSignal TransductionStem CellsMesodermDrosophilaIn Situ HybridizationMorphogenesisBasic Helix-Loop-Helix Transcription FactorsEndodermZebrafish ProteinsEctodermEmbryonic InductionVulvaZebrafishModels, BiologicalCaenorhabditis elegansCaenorhabditis elegans ProteinsMolecular Sequence DataMutationDNA-Binding ProteinsAnimals, Genetically ModifiedXenopus ProteinsGenes, HomeoboxNerve Tissue ProteinsWnt ProteinsNeuronsPhenotypeEmbryonic Stem CellsRepressor ProteinsBone Morphogenetic ProteinsGastrulaCell LineReceptor, Notch1Hedgehog ProteinsChick EmbryoGenes, InsectTrans-ActivatorsDrosophila melanogasterEmbryo, MammalianEyeBase SequenceMembrane ProteinsEmbryonic DevelopmentBlastomeresNervous SystemSense OrgansCells, CulturedLIM-Homeodomain ProteinsNeural PlateOrganogenesisAmino Acid SequenceNodal ProteinNeural CrestWnt1 ProteinT-Box Domain ProteinsMice, TransgenicInsect ProteinsGerm CellsNuclear ProteinsPaired Box Transcription FactorsCell PolarityBone Morphogenetic Protein 4Juvenile HormonesRNA, MessengerNotochordCell ProliferationGene Expression RegulationCell DivisionPhotoreceptor Cells, InvertebrateGastrulationLarvaGenes, HelminthTranscription, GeneticImmunohistochemistryFibroblast Growth FactorsCentral Nervous SystemOtx Transcription FactorsEye ProteinsGATA Transcription Factorsbeta CateninWingNeurogenesisGreen Fluorescent ProteinsXenopusHelminth ProteinsNeural Stem CellsGerm LayersTime FactorsRhombencephalonEmbryonic StructuresCell MovementMice, Knockout