PACAP illustration (IMAGE) Salk Institute Caption Illustration demonstrating how the neuropeptide PACAP mediates panic disorder and the overwhelming symptoms of a panic attack. Credit Salk Institute Usage Restrictions With credit and related coverage License Original 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.