Biofuel (IMAGE) DOE/Los Alamos National Laboratory Caption Understanding the structure of an enzyme that helps bacteria break down cellulose and chitin in woody plant fibers can aid in developing better biofuels. In this image, an electron density map (gray) shows the structure of the active site center of the LPMO enzyme under study, depicting a dioxygen molecule (red stick) bound to a catalytic copper ion (bronze). Credit LANL 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.