LampreysHagfishesPetromyzonJawVertebratesGnathostomaDogfishSharksAnimal FinsBiological EvolutionFishesCircular DichroismDNA, CircularPhylogenyFossilsEvolution, MolecularGene DuplicationMolecular Sequence DataGene Expression Regulation, DevelopmentalHomeodomain ProteinsPhysiology, ComparativeSwimmingSpinal CordReticular Formation