LeechesHirudo medicinalisLeechingPlants, MedicinalAeromonasGanglia, InvertebrateGangliaSwimmingBlotting, SouthwesternOctopamineInvertebrate HormonesInterneuronsFMRFamideGastrointestinal TractMotor NeuronsSymbiosisEthnobotanyMedicine, TraditionalNervous SystemLocomotionSerotoninCentral Nervous SystemPhytotherapyPlant ExtractsAction PotentialsBehavior, AnimalMedicine, African TraditionalEthnopharmacologyNeuronsSequence Analysis, DNAPlant Preparations