LampreysPetromyzonCholic AcidsVertebratesPyrrolidonecarboxylic AcidFishesGillsSea UrchinsHagfishesSex AttractantsPhylogenyBiological EvolutionOlfactory MucosaBile Acids and SaltsOceans and SeasEvolution, MolecularMolecular Sequence DataPhysiology, ComparativeSwimmingAmino Acid SequenceSea AnemonesSpinal CordLarva MigransReticular FormationMediterranean SeaNorth SeaLocomotion