Pten Gene (IMAGE) University of California - San Diego Caption Deletion of the <em>Pten</em> gene promotes axon regeneration in young but not old mice after spinal cord injury. Credit UC San Diego Health Usage Restrictions Use photo credit as indicated 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.