title: Atypical muscle cells in the wall of the renal calix and pelvis with a note on their possible significance.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D000882:Haplorhini; D007682:Kidney Pelvis / Q000033:anatomy & histology* / Q000502:physiology; D009130:Muscle, Smooth / Q000166:cytology*; D011817:Rabbits; D051381:Rats