TREK Potassium Channel (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The TREK1 ion channel (blue) controls the passage of potassium ions (pink) through the plasma membrane (grey) of neurons, which sets neuron excitability. Credit Image from Isacoff group Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.