Limb BudsExtremitiesLimb Deformities, CongenitalPolydactylyChick EmbryoMesodermFibroblast Growth Factor 4EctodermGene Expression Regulation, DevelopmentalHedgehog ProteinsMorphogenesisFibroblast Growth Factor 8Fibroblast Growth FactorsForelimbBody PatterningIn Situ HybridizationWingCartilageLimb SalvageEmbryonic InductionHomeodomain ProteinsBone Morphogenetic ProteinsHindlimbMSX1 Transcription FactorGenes, HomeoboxQuailPhantom LimbAmbystoma mexicanumTrans-ActivatorsEmbryo, MammalianTranscription FactorsMolecular Sequence DataRescue WorkMutationBone Morphogenetic Protein 2RegenerationFibroblast Growth Factor 10ChondrogenesisProteinsSomitesEmbryonic and Fetal DevelopmentSignal TransductionEctromeliaAvian ProteinsToesTretinoinBone Morphogenetic Protein 4Cell DifferentiationMice, TransgenicBase SequenceSyndactylyAmino Acid SequenceLegSalamandridaePhenotypeTeratogensLower ExtremityKruppel-Like Transcription FactorsPaired Box Transcription FactorsTime FactorsCoturnixMice, Mutant StrainsWnt ProteinsGene ExpressionFeathersIschemiaDNA-Binding ProteinsSOX9 Transcription FactorEmbryo, NonmammalianAmputationNotophthalmus viridescensChimeraMuscle, SkeletalEmbryonic DevelopmentT-Box Domain ProteinsModels, BiologicalUreterAmbystomaRNA, MessengerOrgan Culture TechniquesZebrafish ProteinsMusclesImmunohistochemistrySequence Homology, Amino AcidElaeagnaceaeProto-Oncogene ProteinsMice, KnockoutIntercellular Signaling Peptides and ProteinsBone and BonesCloning, MolecularMyogenic Regulatory Factor 5DNA PrimersOrganogenesisCells, CulturedEmbryonic StructuresMolecular Probe TechniquesXenopus ProteinsVertebratesMuscle DevelopmentUlna