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. 2008 Dec;132(6):607–612. doi: 10.1085/jgp.200810149

Figure 1.

Figure 1.

Equivalent circuit representing the frog skin. ENa represents the electromotive force of the Na+-transporting mechanism (sodium pump). RNa represents the resistance to Na+ movement across the frog skin. RΣI represents the combined resistance to all other ions. Modified after Ussing and Zerahn (1951).