PlanariansRegenerationAmbystoma mexicanumTurbellariaExtremitiesNotophthalmusAmbystomaNotophthalmus viridescensForelimbSalamandridaeHelminth ProteinsAnimal FinsTailIn Situ HybridizationPlatyhelminthsTriturusRNA InterferenceGenes, HelminthBody PatterningStem CellsGenome, HelminthHeadAmputationGene Expression Regulation, DevelopmentalUrodelaCell DifferentiationPleurodelesMolecular Sequence DataWilms TumorSmad Proteins, InhibitoryNerve TissueAnimal StructuresGenes, Homeobox