VertebratesEvolution, MolecularChordata, NonvertebratePhylogenyLampreysHagfishesBiological EvolutionPetromyzonGene DuplicationMolecular Sequence DataFishesTetraodontiformesZebrafishChordataTakifuguAmino Acid SequenceMultigene FamilyGenomeConserved SequenceCiona intestinalisSharksSequence AlignmentSpecies SpecificityBase SequenceGenes, HomeoboxSkates (Fish)Sequence Homology, Amino AcidGene Expression Regulation, DevelopmentalChickensGenes, DuplicateJawZebrafish ProteinsFossilsSyntenyModels, GeneticEmbryo, NonmammalianTurtlesMammalsSequence Homology, Nucleic AcidBody PatterningIn Situ HybridizationCloning, MolecularNeural CrestSequence Analysis, DNAHomeodomain ProteinsTranscription FactorsDirected Molecular EvolutionLikelihood FunctionsDNA, ComplementaryGenomicsIntronsChromosome MappingXenopus laevisExonsProtein Structure, TertiarySelection, GeneticDNA-Binding ProteinsGene Expression RegulationGenesInvertebratesRNA, MessengerGene ExpressionReptilesGenetic VariationCultural EvolutionMutationAdaptation, BiologicalDrosophilaModels, BiologicalAmphibiansLizardsXenopus ProteinsClonal EvolutionOryziasDrosophila ProteinsPrimatesDrosophila melanogasterUrochordataXenopusFish ProteinsAnimals, Genetically ModifiedMorphogenesisPhenotypeChick EmbryoSignal TransductionLarvaAdaptation, PhysiologicalExtremitiesReproductionPseudogenesArthropodsHominidaeGenes, InsectMesodermGenetic SpeciationPhotoreceptor Cells, VertebrateAvian ProteinsGene Transfer, HorizontalDNA PrimersComputational Biology