PirB Expression (image) NIH/National Eye Institute Share Print E-Mail Caption PirB (red) is heavily concentrated on the surface of growing nerve cells. Credit Dr. Carla Shatz, Stanford University. Usage Restrictions Please credit Dr. Carla Shatz, Stanford University. 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.