Abnormal Blood Vessel Formation (IMAGE) Washington University School of Medicine Caption In this image of the retina, normal blood vessels (green) surround a clump of new, abnormal vessels that has formed beneath the center of the retina. Scientists at Washington University School of Medicine in St. Louis have identified a molecular pathway that leads to the formation of such blood vessels, which can cause blindness in people with age-related macular degeneration. Credit Washington University School of Medicine 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.