Figure 2: Changing extracellular concentrations of Mg2+ does not influence intracellular magnesium levels. One can see a typical experiment lasting approximately 3 hours. The signal stabilises some
minutes after impalement. The electrode is equilibrated at the end of the experiment. Upon changing extracellullar Mg2+ a small depolarisation
of the membrane potential can be seen without influencing the Mg2+-subtraction potential.