A and B, representative whole-cell currents from a Slo+/+ CCSM cell in the presence of IBTX and a Slo−/− CCSM cell, respectively. Currents were elicited by 250-ms depolarizing pulses (see inset). C, voltage-gated K+ current density and current–voltage relationship for Slo+/+ cells (with IBTX) is the same as for Slo−/− cells. The voltage-gated K+ current in CCSM cells of both genotypes is inhibited with 5 mm TEA. D, average TEA-sensitive current density from Slo+/+ and Slo−/− cells (n, number of cells).