Astrocytes (IMAGE) University of Wisconsin-Madison Caption Named for their star shape, these astrocytes -- derived from human stem cells -- show their structural protein, GFAP, in red. DNA in the cell nucleus appears blue. Credit Jeffrey Jones 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.