Fig. 6.

Ca²⁺-activated K⁺ currents were not altered by theqvr¹ mutation. Traces(left) represent outward currents generated by membrane depolarization to different voltages ranging from −40 to 30 mV at an increment of 10 mV from a holding potential of −80 mV. Standard saline contained 20 mm CaCl₂ and 4 mm MgCl₂. Voltage-gated K⁺currents were blocked by 1 mm 4-AP and 100 μmquinidine. Tonicity of the saline was increased by adding 353 mm sucrose to reduce muscle contraction. Data are the mean ± SEM measured at 11°C.