OPC Activation Around Chronic Brain Implant (image) University of Pittsburgh Share Print E-Mail Caption OPC activation around Chronic Brain Implant (center): OPC (green), microglia (red), astrocyte (white), and cell nuclei (blue). Scalebar = 100 microns. Credit Steven Wellman and Lehong Li. Usage Restrictions None Share Print E-Mail 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.