Enzymes (IMAGE) U.S. National Science Foundation Caption This is a cartoon diagram of an enzyme, an example of the class of FDTS enzymes. Credit Amnon Kohen, University of Iowa 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.