Axolotl Spinal Cord (IMAGE) Technische Universität Dresden Caption Cross-section of axolotl spinal cord. Neural stem cells in the middle (red and green) line the fluid-filled central canal, nerve fibres are on the outside (yellow). Blue labels cell nuclei. Credit L. Otsuki/IMP Usage Restrictions None 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.