title: Fine structure of extra-nodal transitional cardiocytes in rat left atrium.
mesh_terms: D000818:Animals; D016275:Atrial Function; D004721:Endoplasmic Reticulum; D005246:Feedback; D006325:Heart Atria / Q000166:cytology; D006329:Heart Conduction System / Q000166:cytology* / Q000502:physiology; D008297:Male; D008854:Microscopy, Electron; D008931:Mitochondria, Muscle; D009206:Myocardium / Q000166:cytology*; D009210:Myofibrils; D051381:Rats; D012849:Sinoatrial Node