Blood vessels in the retina (IMAGE) Walter and Eliza Hall Institute Caption WEHI researchers identified genetic differences in MacTel patients that affect the structure of blood vessels in the retina (pictured), and the production and delivery of critical amino acids to this tissue. Credit WEHI 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.