Zebrafish Larva (IMAGE) California Institute of Technology Caption This image shows a five-day old zebrafish larva in which a specific population of neurons in the brain and spinal cord are labeled with green fluorescent protein, highlighting the optical transparency of these animals. Credit Cindy N. Chiu and David A. Prober/Caltech 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.