Zebrafish Embryo Spinal Cord (IMAGE) Howard Hughes Medical Institute Caption Inside the spinal cord of a zebrafish embryo, new neurons light up in different colors, letting scientists track nerve circuit development. Credit T. Liu et al./Science 2018 Usage Restrictions Must use credit 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.