title: Ultrastructural variations of Z bands in cow Purkinje fibres.
mesh_terms: D000818:Animals; D002417:Cattle; D006329:Heart Conduction System / Q000166:cytology*; D008854:Microscopy, Electron; D009206:Myocardium / Q000166:cytology; D009210:Myofibrils; D012270:Ribosomes