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Kinetics of the change in intramembrane potential on neuroblastoma cells induced by a tenfold increase in divalent cation concentration in the external medium. At time = 0, 2 mM Ba (open diamonds), Mg (open triangles), and Ca (open circles) are externally applied to the bathing medium containing 0.2 mM of the corresponding divalent cation. Each point represent the mean of the surface potential measurements of six cells.
