Image of Fluorescent Zebrafish (IMAGE) Karolinska Institutet Caption Most of the experiments in the current paper in PNAS (Bräutigam et al., Nov. 2013) were conducted in zebrafish that were genetically modified, so that the circulatory system glowed in a green fluorescent colour. In this image a two days old fluorescent zebrafish. Credit Lars Bräutigam Usage Restrictions This image may only be published/reproduced in connection to media reports about the Bräutigam et al. paper in <i>PNAS</i>, Nobember 2013. For further information, please contact the Press Office of Karolinska Institutet. 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.