LeechesHirudo medicinalisAnnelidaLeechingPlants, MedicinalAeromonasOligochaetaGanglia, InvertebrateGangliaSwimmingBlotting, SouthwesternOctopamineInvertebrate HormonesInterneuronsFMRFamideGastrointestinal TractSymbiosisNervous SystemMotor NeuronsEthnobotanyMedicine, TraditionalPhylogenyInvertebratesLocomotionSerotoninCentral Nervous SystemPhytotherapyMolecular Sequence DataHemerythrinErythrocruorinsSequence Analysis, DNAPlant ExtractsAction PotentialsBehavior, AnimalPlatyhelminthsMedicine, African TraditionalEthnopharmacologyNeuronsEchinodermataBiological EvolutionArthropods