Skinbow Under a Microscope (IMAGE) Duke University Caption Every cell on the surface of this genetically engineered zebrafish expresses a unique combination of green, red and blue fluorescent proteins, resulting in over 70 different hues that can be distinguished under a microscope. Credit Chen-Hui Chen, Duke University 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.