Fly Retina (IMAGE) The Zuckerman Institute at Columbia University Caption Fly retina showing all R8 photoreceptors in green and yR8 receptors in red. Credit Sarah Heath/Behnia lab/Columbia University's Zuckerman Institute Usage Restrictions Please contact Zuckerman Institute press office for reprint permissions. 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.