Fewer Scars in the Central Nervous System (IMAGE) University of Freiburg Caption The blood clotting protein fibrinogen (red) is deposited in the stem cell niche and regulates the contribution of stem cells (green) to repair mechanisms in central nervous system diseases. Credit Source: Schachtrup lab / University of Freiburg 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.