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A mammalian neuromuscular junction endplate region at rest has the following concentrations of sodium and potassium: [K+]in = 140 mM,[K+]out = 5 mM,[Na+]in = 10 mM,[Na+]out = 145 mM,[Cl-]in = 10 mM,and [Cl-]out = 125 mM.What is the membrane potential of this endplate region (at 37°C)?
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