Zebrafish Blood Cells (IMAGE) Harvard Medical School Caption Zebrafish blood cells made from stem cells with unique color-labels. The color-labeling allows researchers to follow an individual stem cell's development. Credit Jonathan Henninger, Zon Lab Usage Restrictions With appropriate caption and 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.