title: Unusual presynaptic inclusions in the CNS of the marine polychaete, Nereis virens.
abstract: Unusual electron-dense inclusions occur in the nerve terminals of the Nereis CNS. These structures are closely associated with synaptic vesicles and contain what appear to be incomplete vesicles within them suggesting that they may be an organelle involved in synaptic vesicle production.
mesh_terms: D000818:Animals; D001921:Brain / Q000648:ultrastructure*; D002479:Inclusion Bodies / Q000648:ultrastructure; D008854:Microscopy, Electron; D011077:Polychaeta / Q000648:ultrastructure*; D013569:Synapses / Q000648:ultrastructure*; D013572:Synaptic Vesicles / Q000648:ultrastructure