Neurons (IMAGE) University of California - San Diego Caption Neurons, shown here in red and yellow, are some of the slowest cells to regenerate after injury. In this section of a mouse brain, yellow neurons are regenerating while red neurons are non-regenerating. Credit UC San Diego Health Sciences Usage Restrictions Use photo credit 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.