title: Enzymatic digestion and urea extraction on leptomeric structures and normomeric myofibrils in heart muscle cells.
mesh_terms: D000818:Animals; D006570:Heterochromatin / Q000648:ultrastructure; D008931:Mitochondria, Muscle / Q000648:ultrastructure; D009206:Myocardium / Q000648:ultrastructure*; D009210:Myofibrils / Q000648:ultrastructure*; D010434:Pepsin A / Q000494:pharmacology*; D011402:Pronase / Q000494:pharmacology*; D011689:Purkinje Cells / Q000648:ultrastructure; D014508:Urea / Q000494:pharmacology*
chemical_list: D006570:Heterochromatin; D014508:Urea; D010434:Pepsin A; D011402:Pronase