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. 1999 Feb 1;113(2):177–186. doi: 10.1085/jgp.113.2.177

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Effect of Mg²⁺ concentration on unitary Ca²⁺ current amplitude. Ca²⁺ current amplitude was measured at 0 mV, in 2 (top), 5 (middle), and 10 (bottom) mM Ca²⁺, in the absence (left) and presence (right) of 1 mM Mg²⁺. Current signal was filtered at 1 kHz, except for the trace in 2 mM Ca²⁺ and 1 mM Mg²⁺, which was filtered at 300 Hz. Continuous lines indicate the zero current level and the dotted lines indicate the mean opening level. The corresponding values of current amplitude obtained from the total amplitude histograms are indicated below each trace.