Cell surface membranes in close contact. Role of calcium and magnesium ions.
D002118:Calcium; D002462:Cell Membrane; D002463:Cell Membrane Permeability; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007477:Ions; D008274:Magnesium
D007477:Ions; D008274:Magnesium; D002118:Calcium