title: Ultrastructure of synapses in a primitive coelenterate.
mesh_terms: D000818:Animals; D001369:Axons / Q000166:cytology; D002395:Catecholamines; D003063:Cnidaria / Q000166:cytology*; D008854:Microscopy, Electron; D008928:Mitochondria; D013569:Synapses / Q000166:cytology*
chemical_list: D002395:Catecholamines