Hypocretin-producing Neurons (IMAGE) University of California - Los Angeles Caption The left image depicts hypocretin-producing neurons in a healthy human brain, on the right, an excess of hypocretin-producing neurons in a heroin user. Credit UCLA Health 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.