title: A light and electron microscopic examination of the rat atrioventricular node.
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis; D000818:Animals; D001369:Axons / Q000166:cytology; D002395:Catecholamines / Q000032:analysis; D006329:Heart Conduction System / Q000033:anatomy & histology* / Q000166:cytology; D008854:Microscopy, Electron; D051381:Rats
chemical_list: D002395:Catecholamines; D000110:Acetylcholinesterase