Body PatterningSepiaGene Expression Regulation, DevelopmentalDrosophilaDrosophila ProteinsHomeodomain ProteinsEmbryo, NonmammalianHedgehog ProteinsMorphogenesisIn Situ HybridizationZebrafishZebrafish ProteinsMesodermEctodermBone Morphogenetic ProteinsEmbryonic InductionExtremitiesTranscription FactorsRhombencephalonSignal TransductionGenes, HomeoboxXenopus ProteinsFibroblast Growth Factor 8GastrulaWingSomitesLimb BudsWnt ProteinsInsect ProteinsBranchial RegionWnt1 ProteinFibroblast Growth FactorsChick EmbryoNodal ProteinMutationPhenotypeGenes, InsectEndodermBone Morphogenetic Protein 4Nervous SystemOrganizers, EmbryonicHeadTrans-ActivatorsAnimals, Genetically ModifiedModels, BiologicalEmbryonic DevelopmentMolecular Sequence DataNeural TubeVertebratesNeural CrestDrosophila melanogasterNotochordTelencephalonEmbryo, MammalianCell DifferentiationXenopusOrganogenesisDNA-Binding ProteinsT-Box Domain ProteinsGastrulation