Mature Blood Vessels Formed in a Hydrogel (IMAGE) Rice University Caption A microscope image shows mature blood vessels that formed in a hydrogel after two weeks of growth in a mouse model, with red blood cells flowing through the vessel at bottom right. The vessels form from stem cells derived from amniotic fluid in a technique created by the lab of Rice University and Texas Children's Hospital bioengineer Jeffrey Jacot. The scale bar is 100 microns. Credit Jacot Lab/Rice University Usage Restrictions For news reporting purposes only. 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.