title: Calcium-rich, refractile granules in Tetrahymena pyriformis and their possible role in the intracellular ion-regulation.
mesh_terms: D000818:Animals; D002118:Calcium / Q000502:physiology; D002462:Cell Membrane / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008928:Mitochondria / Q000648:ultrastructure; D013769:Tetrahymena pyriformis / Q000648:ultrastructure*
chemical_list: D002118:Calcium