Non-lipid osmiophilic granules in the presynaptic neuroplasma of the boutons.
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001921:Brain / Q000166:cytology*; D002415:Cats; D005725:Ganglia, Autonomic / Q000166:cytology*; D005727:Ganglia, Spinal / Q000166:cytology*; D066298:In Vitro Techniques; D051381:Rats; D013116:Spinal Cord / Q000166:cytology*; D013569:Synapses / Q000166:cytology
D000596:Amino Acids