Fatty Liver (IMAGE) University of Pennsylvania School of Medicine Caption Normal mouse liver and a liver full of fat, stained with a dye called "Oil Red O" where fat shows up as red. Credit Courtesy of the lab of Mitch Lazar, 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.