Salk Researchers Discover That Stem Cell Marker Regulates Synapse Formation (IMAGE) Salk Institute Caption Nestin, a well-known stem cell marker, regulates the formation of neuromuscular junctions (shown in yellow), the contact points between muscles cells and "their" motor neurons (shown in green). Credit Courtesy of Dr. Jiefei Yang, Salk Institute for Biological Studies Usage Restrictions News media reproduction to illustrate this story permitted with proper attribution as provided above. For one time use only. 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.