A neuropharmacologically active substance from jellyfish ganglia

Abstract

For three main reasons there is almost no information on possible transmitter substances of coelenterates. Animals of this group fail to respond to known neurohumours in reasonable concentrations, the nervous system is almost always diffusely spread in the tissue so that extracts cannot be prepared from it alone and, finally, in most of the responses of coelenterates which might be used for assay purposes it is not possible to specify the site of action of applied substances.