Notophthalmus viridescensSalamandridaeExtremitiesRegenerationTriturusGene Expression ProfilingGene ExpressionAmbystoma mexicanumGene Expression RegulationAmbystomaTurbellariaLimb BudsUrodelaAnimal FinsNotophthalmusPlanariansGene Expression Regulation, DevelopmentalForelimbOligonucleotide Array Sequence AnalysisRNA, MessengerTail