Notophthalmus viridescensSalamandridaeRegenerationExtremitiesTailUrodelaAmbystomaAmbystoma mexicanumPleurodelesTriturusLarvaLizardsAmputationPAX7 Transcription FactorNerve RegenerationLimb BudsHymecromoneLiver RegenerationAnimals, Genetically ModifiedXenopus laevisXenopus ProteinsAnimal FinsSpinal CordForelimbPlanariansTurbellariaGene Expression Regulation, DevelopmentalNotophthalmusBone RegenerationLimb SalvageLimb Deformities, Congenital