1-EBIO is a potent KCa2/3 channel activator that activates the channels by increasing the Ca2+ sensitivity by stabilizing the interaction between calmodulin and the channels1,2, thus shifting the activation curve of the channels to the left. 1-EBIO activates KCa3.1 with an EC50 value of around 30 μM and all three KCa2 channels with EC50 value around 300 μM