Photoreceptors (IMAGE) University of Maryland School of Medicine Caption Healthy mouse retinas (top) with support cells (outlined in blue) and photoreceptors (purple). In the CIB2 mutant mouse retina (bottom), the photoreceptors are not digested as fast and accumulate. Credit Saumil Sethna Usage Restrictions Credit 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.