Retina (IMAGE) Medical College of Georgia at Augusta University Caption Retina: Panel A shows the retina of a healthy mouse with normal homocysteine levels. Panels B,C and D are from mice with a genetic defect that results in a 40-fold increase in homocysteine levels. These retinas show fragmentation in less than three weeks of life. Credit Medical College of Georgia 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.