Limb BudsMorphogenesisExtremitiesGene Expression Regulation, DevelopmentalMesodermChick EmbryoLimb Deformities, CongenitalPolydactylyEctodermFibroblast Growth Factor 4Hedgehog ProteinsBody PatterningIn Situ HybridizationFibroblast Growth FactorsFibroblast Growth Factor 8Homeodomain ProteinsForelimbWingBone Morphogenetic ProteinsCartilageEmbryonic InductionMSX1 Transcription FactorGenes, HomeoboxSignal TransductionQuailTranscription FactorsFibroblast Growth Factor 10MutationLimb SalvageMolecular Sequence DataEmbryo, MammalianCell DifferentiationEmbryo, NonmammalianHindlimbUreterEpitheliumEmbryonic and Fetal DevelopmentTrans-ActivatorsOrganogenesisPhenotypeOrgan Culture TechniquesPhantom LimbAmino Acid SequenceAmbystoma mexicanumBone Morphogenetic Protein 4SomitesModels, BiologicalZebrafish ProteinsCell PolarityZebrafishFeathersWnt ProteinsMice, TransgenicProteinsBase SequenceBone Morphogenetic Protein 2RegenerationEmbryonic DevelopmentAvian ProteinsCell MovementOdontogenesisChondrogenesisDrosophila ProteinsEpithelial CellsPaired Box Transcription FactorsImmunohistochemistryMice, Mutant StrainsTretinoinBranchial RegionDrosophilaTime FactorsDNA-Binding ProteinsCoturnixT-Box Domain ProteinsGene ExpressionRNA, MessengerEctromeliaCell DivisionMembrane ProteinsSequence Homology, Amino AcidTeratogensKruppel-Like Transcription FactorsMice, KnockoutToesSalamandridaeCells, CulturedChimeraAnimals, Genetically ModifiedToothSOX9 Transcription FactorMicroscopy, ElectronDNA PrimersCadherinsIntercellular Signaling Peptides and ProteinsNerve Tissue ProteinsHyphaeXenopus ProteinsMice, Inbred ICRSyndactylyLeg