White Fat Cells (IMAGE) Washington University School of Medicine Caption Sections of white fat taken from normal mice (left) and from mice without an enzyme called fatty acid synthase (FAS) in their fat cells (right). Mice without FAS can eat a high-fat diet without becoming obese. Credit Semenkovich lab 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.