Usher syndrome photoreceptors (IMAGE) University of Maryland School of Medicine Caption In eye tissue from an Usher syndrome mouse model (right), the light-dark cycle proteins (purple and green) are found spread throughout the two photoreceptor compartments rather than separated in one or the other as in the healthy mouse eye tissue (left). Credit eLife Usage Restrictions Please credit License Original 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.