Figure 2

Summary of whole-cell patch clamp currents with only Na⁺ or K⁺ as the major permeant ions. A) Bar graph of the conductances and B) currents at -100 mV in symmetrical Na⁺-rich solutions (B2, P2) and K⁺-rich solutions (B3, P3). C) Current-voltage (I-V) relationships of the Benzamil-sensitive current at steady state (near 300 ms). Benzamil-sensitive current was only observed in Na⁺ solutions. K⁺ currents were markedly smaller than Na⁺ currents.