A Bad Alliance (IMAGE) University of Pennsylvania School of Medicine Caption Visualizing eosinophilic esophagitis: this is a computer-enhanced color image of an immune cell infiltrating the inflamed esophagus of a mouse. Credit Mario Noti, Elia Tait Wojno, and David Artis, Perelman School of Medicine, University of Pennsylvania 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.