Potassium Channel Illustration (image) Washington University School of Medicine Caption Potassium ions (shown in purple) pass through the narrow opening of a large potassium channel to generate the electrical signals that allow cells to communicate with one another. Researchers at Washington University in St. Louis have shown how an unusual protein temporarily blocks these ions from the channel, which gives cells a chance to recover so they can continue firing. Credit Lingle laboratory Usage Restrictions None 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.