Cell Death Pathway in the Retina (IMAGE) University of Pennsylvania Caption Researchers from the University of Pennsylvania School of Veterinary Medicine unexpectedly found an overlap (yellow) of TNF genes (red) and Müller cells (green) in a diseased retina. Credit University of Pennsylvania Usage Restrictions In context of reporting 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.