title: Ultrastructural patterns in the rabbit heart pace-maker area localized by electrophysiological methods.
mesh_terms: D000818:Animals; D001369:Axons; D004562:Electrocardiography; D008854:Microscopy, Electron; D009469:Neuromuscular Junction / Q000166:cytology; D011817:Rabbits; D012849:Sinoatrial Node / Q000166:cytology*