Notophthalmus viridescensSalamandridaeExtremitiesRegenerationAmbystoma mexicanumUrodelaAmbystomaTriturusForelimbLimb BudsPleurodelesNerve RegenerationAmputationLiver RegenerationTailAmphibiansAnimal FinsIn Situ HybridizationPlanariansTurbellariaLarvaWound HealingNotophthalmusFibroblast Growth FactorsBone RegenerationHindlimbGene Expression Regulation, DevelopmentalXenopus ProteinsXenopus laevisLimb SalvagePAX7 Transcription FactorLimb Deformities, CongenitalCell DifferentiationDenervation