title: Intracellular measurements of ion activities.
mesh_terms: D000818:Animals; D001826:Body Fluids / Q000032:analysis*; D002118:Calcium / Q000032:analysis; D002463:Cell Membrane Permeability; D002614:Chelating Agents; D002712:Chlorides / Q000032:analysis; D004566:Electrodes; D004573:Electrolytes / Q000032:analysis*; D005780:Gelatin; D006801:Humans; D007424:Intracellular Fluid / Q000032:analysis*; D008164:Luminescent Proteins; D008274:Magnesium / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D011188:Potassium / Q000032:analysis; D012964:Sodium / Q000032:analysis
chemical_list: D002614:Chelating Agents; D002712:Chlorides; D004573:Electrolytes; D008164:Luminescent Proteins; D005780:Gelatin; D012964:Sodium; D008274:Magnesium; D011188:Potassium; D002118:Calcium