Limb BudsMesodermExtremitiesEctodermChick EmbryoGene Expression Regulation, DevelopmentalLimb Deformities, CongenitalPolydactylyBody PatterningMorphogenesisFibroblast Growth Factor 4Embryonic InductionHedgehog ProteinsIn Situ HybridizationFibroblast Growth FactorsFibroblast Growth Factor 8SomitesHomeodomain ProteinsBone Morphogenetic ProteinsForelimbGastrulaGenes, HomeoboxQuailEmbryo, NonmammalianWingCartilageXenopus ProteinsFetal ProteinsT-Box Domain ProteinsLimb SalvageTranscription FactorsMSX1 Transcription FactorHindlimbBone Morphogenetic Protein 4Trans-ActivatorsEmbryonic and Fetal DevelopmentEmbryo, MammalianZebrafish ProteinsCoturnixAmbystoma mexicanumCell DifferentiationMolecular Sequence DataSignal TransductionPhantom LimbAvian ProteinsProteinsWnt ProteinsBone Morphogenetic Protein 2XenopusZebrafishFibroblast Growth Factor 10TretinoinEctromeliaEmbryonic DevelopmentXenopus laevisBase SequenceChondrogenesisDNA-Binding ProteinsAmino Acid SequenceRegenerationPaired Box Transcription FactorsToesNervous SystemMutationGastrulationTwist Transcription FactorChimeraGene ExpressionCell LineageMyogenic Regulatory Factor 5Branchial RegionTailMice, Mutant StrainsTeratogensMice, TransgenicSyndactylyLegTime FactorsBasic Helix-Loop-Helix Transcription FactorsActivinsVertebratesMusclesLower ExtremityKruppel-Like Transcription FactorsModels, BiologicalRNA, MessengerSalamandridaeNodal ProteinIntercellular Signaling Peptides and ProteinsFeathersTransforming Growth Factor betaHeadNeural CrestPhenotypeOrgan Culture TechniquesAmbystomaBone Morphogenetic Protein ReceptorsMyoD ProteinCell MovementSequence Homology, Amino Acid