title: The fine structure of pacemaker cells in the pig renal calices.
mesh_terms: D000818:Animals; D001369:Axons / Q000166:cytology*; D006654:Histology, Comparative; D007682:Kidney Pelvis / Q000166:cytology*; D008854:Microscopy, Electron; D009130:Muscle, Smooth / Q000166:cytology*; D051381:Rats; D013552:Swine / Q000033:anatomy & histology*