Comparative ultrastructure of the sinus node in man and dog.
D000818:Animals; D004285:Dogs; D006329:Heart Conduction System / Q000166:cytology*; D006654:Histology, Comparative; D006801:Humans; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D008928:Mitochondria / Q000166:cytology; D008931:Mitochondria, Muscle / Q000166:cytology; D009210:Myofibrils / Q000166:cytology; D010784:Photomicrography