An Endothelial Cell Colony (IMAGE) University of Helsinki Caption This shows an endothelial cell colony formed by one single adult vascular endothelial stem cell on a culture disk. Credit Image: Petri Salvén Laboratory Copyright: University of Helsinki Usage Restrictions Usage only with this piece of news 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.