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Fig. 2. Adding ATP and ADP as mobile Ca²⁺ and Mg²⁺ buffers slightly shorten the action potential (9–10 s). ATP, ADP and Mg²⁺ not included (dash-dot line). Normal conditions: [ATP]_tot 7 mM, [ADP]_tot 5 µM, [Mg²⁺]_i 1 mM (solid line). Metabolic inhibition: [ATP]_tot 3 mM, [ADP]_tot 3 mM, [Mg²⁺]_i 2.25 mM (dash-dot-dot line).

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