Figure 3.

Absence of a proton current in other cell types. A) Response to acidic solutions measured in whole-cell recording from the cell types indicated. Cells were bathed in TEA-based solution at pH 7.4 before the stimulus. The voltage was held at −80 mV and ramped from −80 to +80 mV (1 V/s). Current at −80 mV is plotted. B) Summary data of peak current and zinc-sensitive component. Numbers in parentheses are number of cells recorded. **P < 0.01, ***P < 0.001 compared with PKD2L1 cells using 1-tailed Student's t test.