Figure 6. Effect of Cl⁻ channel blockers on single cGMP-activated Cl⁻ channel currents in outside-out patches.

A shows a trace of current at a patch potential of −50 mV in the absence and presence of niflumic acid (NFA; 100 μm; filled bar). B, trace of current from a second outside-out patch at −50 mV in the absence and presence of 10 μm ZnCl₂ (open bar).