Potential Pathway for Drug Intervention (IMAGE) Salk Institute Caption The top image shows neural precursor cells generate glial cells (shown in green) after being stimulated with retinoic acid or cytokines. The bottom image shows neural precursor cells making more synaptojanin-1 protein produce more glial cells. Credit Image: Courtesy of Dr. Federico Herrera, 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.