title: Calcification of Spirostomum ambiguum.
mesh_terms: D002113:Calcification, Physiologic; D016798:Ciliophora / Q000166:cytology / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006882:Hydroxyapatites / Q000378:metabolism*; D008722:Methods; D008954:Models, Biological; D010710:Phosphates / Q000032:analysis
chemical_list: D006882:Hydroxyapatites; D010710:Phosphates