Nanog Reverses Aging in Adult Stem Cells (IMAGE) University at Buffalo Caption The images above show, from left to right, functioning stem cells, stem cells no longer functioning due to Hutchinson-Gilford Progeria syndrome (HGPS), and stem cells previously not functioning due to HGPS that were rebooted by the embryonic stem cell gene Nanog. Credit Stelios Andreadis. 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.