title: The fine structure of the Necturus (amphibia) heart.
mesh_terms: D000818:Animals; D001369:Axons / Q000033:anatomy & histology; D002462:Cell Membrane; D002467:Cell Nucleus; D004699:Endocardium / Q000098:blood supply / Q000166:cytology; D006003:Glycogen / Q000032:analysis; D006321:Heart / Q000033:anatomy & histology*; D006325:Heart Atria / Q000033:anatomy & histology; D006339:Heart Rate; D006352:Heart Ventricles / Q000033:anatomy & histology; D007365:Intercellular Junctions; D008854:Microscopy, Electron; D009206:Myocardium / Q000166:cytology*; D009210:Myofibrils; D014562:Caudata / Q000033:anatomy & histology*
chemical_list: D006003:Glycogen