Pathfinding Accomplished (IMAGE) Rockefeller University Caption This image shows a section of the spinal cord of a mouse embryo. Neurons appear green, and those that express the Robo3 receptor are labeled red. Commissural axons appear as long, u-shaped threads, and the bottom, yellow segment of the structure represents the midline. Credit Laboratory of Brain Development and Repair at The Rockefeller University Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. 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.