title: Fine structure of cytoplasmic crystal in Amoeba proteus.
mesh_terms: D000656:Amoeba / Q000648:ultrastructure*; D000818:Animals; D003461:Crystallography; D003593:Cytoplasm / Q000648:ultrastructure; D014508:Urea / Q000031:analogs & derivatives / Q000032:analysis; D014617:Vacuoles / Q000648:ultrastructure
chemical_list: D014508:Urea