VertebratesReptilesAmphibiansFossilsFishesBiological EvolutionIntegumentary SystemPaleontologyEvolution, MolecularZebrafishPhylogenyAnimal FinsLizardsExtremitiesAnatomy, ComparativeTetraodontiformesMolecular Sequence DataAlligators and CrocodilesTakifuguMammalsGene DuplicationDinosaursLampreysZebrafish ProteinsAmino Acid SequenceGene Expression Regulation, DevelopmentalSyntenyFish ProteinsSharksUrodelaForelimbEmbryo, NonmammalianSkeletonExtinction, BiologicalChordataSequence AlignmentGenomeIguanasTurtlesSpecies SpecificityJawGenes, HomeoboxBody PatterningInvertebratesAmbystoma mexicanumBase SequenceBirdsSequence Homology, Amino AcidConserved SequenceHomeodomain ProteinsOryziasIn Situ HybridizationLimb BudsChordata, NonvertebrateChickensXenopusInsectivoraMorphogenesisEarSalamandridaePlatypusDevelopmental BiologyCloning, MolecularMultigene FamilyLocomotionAnuraSnakesChick EmbryoHoof and ClawAnimals, Genetically ModifiedHagfishesBatrachoidiformesVasotocinHistory, AncientSequence Analysis, DNADNA, ComplementaryTranscription FactorsXenopus laevisAir SacsArthropodsGenes, RAG-1Xenopus ProteinsAdaptation, BiologicalSkullToothHumerusModels, GeneticBody SizeLikelihood FunctionsSesamoid BonesGenomicsVomeronasal OrganCiona intestinalisBiomechanical PhenomenaBone and BonesModels, BiologicalPetromyzonSequence Homology, Nucleic AcidGenetic SpeciationDrosophila Proteins