Interneuron (IMAGE) Johns Hopkins Medicine Caption This is a single parvalbumin-expressing interneuron (red) surrounded by many adult neural stem cells (green) in the brain’s hippocampus. Credit Gerry Sun 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.