Closeup of mouse hippocampus (IMAGE) Columbia University Irving Medical Center Caption Mouse hippocampus with rat cells (red) and nuclei of both mouse and rat cells (blue). Credit M. Khadeesh Imtiaz, Columbia University Irving Medical Center Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.