Heteropodatoxin-2 inhibits KV4.2 channel currents expressed in Xenopus oocytes. Currents were elicited by application of voltage step from a holding potential of -100 mV to 0 mV in 100 msec, delivered every 10 seconds. A. Time course of channel activity (current amplitude at +0 mV), before (black) and during (green) application of 100 nM Heteropodatoxin-2 (ab141874). B. Example of superimposed current traces before (black) and during (green) application of 100 nM Heteropodatoxin-2, taken from the experiment in A.