PleurodelesUrodelaSalamandridaeAmbystoma mexicanumNotophthalmus viridescensTriturusAmbystomaRegenerationExtremitiesAmphibiansNotophthalmusProteidaeTailAmbystomatidaeInterrenal GlandEmbryologyLarvaNeurobiologyEctodermMetamorphosis, BiologicalForelimbLimb BudsMesodermGastrulaEmbryo, NonmammalianBody PatterningIn Situ HybridizationCell DifferentiationTretinoinAmputationLens, CrystallineSpinal CordEmbryonic InductionXenopus laevisMammalsXenopusMorphogenesisGene Expression Regulation, DevelopmentalMolecular Sequence DataAmino Acid SequenceMicroscopy, Electron, ScanningBiological EvolutionHomeodomain ProteinsMusclesSequence Homology, Amino AcidImmunohistochemistryPhylogenyBase Sequence