title: Preparation and use of aequorin for rapid microdetermination of Ca 2+  in biological systems.
mesh_terms: D000645:Ammonium Sulfate; D002118:Calcium; D002498:Centrifugation; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D003063:Cnidaria / Q000032:analysis; D005374:Filtration; D008163:Luminescent Measurements; D010783:Photometry / Q000295:instrumentation*; D011506:Proteins / Q000302:isolation & purification*
chemical_list: D011506:Proteins; D000645:Ammonium Sulfate; D002118:Calcium