title: Electron microscope study of the cardiac conduction system.
mesh_terms: D000818:Animals; D002417:Cattle; D004285:Dogs; D000882:Haplorhini; D006329:Heart Conduction System / Q000033:anatomy & histology*; D006801:Humans; D008854:Microscopy, Electron; D011689:Purkinje Cells; D011817:Rabbits; D012849:Sinoatrial Node