Figure 5. Effect of bath 5 mm Ba²⁺ on WT and KO recordings.

A, typical traces obtained from WT (left) and KO (right) recordings under the control condition (upper) and in the presence of Ba²⁺ (lower). Clamp potential was stepped from −80 mV to between +100 and −80 mV. B, mean I–V curve in WT recordings (n = 13) under the control condition (▪) and in the presence of Ba²⁺ (•). C, mean I–V curve in KO recordings (n = 6) under the control condition (▪) and in the presence of Ba²⁺ (•). D, mean Ba²⁺-sensitive currents taken from data in B and C in WT (▪) and KO (•) recordings. Mean currents were recorded at the end of the potential step.