Notophthalmus viridescensSalamandridaeExtremitiesRegenerationLimb BudsVertebratesMultipotent Stem CellsTriturusLimb Deformities, CongenitalAmbystoma mexicanumPolydactylyBody PatterningForelimbHedgehog ProteinsEctodermGene Expression Regulation, DevelopmentalFibroblast Growth FactorsChick EmbryoFibroblast Growth Factor 4Fibroblast Growth Factor 8MorphogenesisMesodermCell DifferentiationAmbystomaHomeodomain ProteinsIn Situ HybridizationEmbryonic InductionUrodelaZebrafishTurbellariaAvian ProteinsAnimal FinsGenes, HomeoboxZebrafish ProteinsHindlimbNotophthalmusWnt ProteinsPlanariansAmputationMolecular Sequence DataBone Morphogenetic ProteinsLimb SalvageWingTailT-Box Domain ProteinsTrans-ActivatorsCell LineageSignal Transduction