How Cells Form New Blood Vessels (IMAGE) University of Basel Caption Vascular system of a two days old zebrafish embryo (magenta: endothelial cells, light blue: blood cells). Credit Image: University of Basel, Biozentrum 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.