Animal FinsAmbystoma mexicanumRegenerationExtremitiesTurbellariaNotophthalmusAmbystomaNotophthalmus viridescensCell ProliferationForelimbSalamandridaeFin WhaleCell DivisionNeuritesCells, CulturedCell DifferentiationSignal TransductionPlanariansTailZebrafishAnimal StructuresCell Line, TumorApoptosisTriturusBromodeoxyuridineGene Expression Regulation, DevelopmentalCell CycleImmunohistochemistryIn Situ HybridizationCell MovementRNA, MessengerAmputation