Enzyme 3-D Structure (image) Biotechnology and Biological Sciences Research Council Share Print E-Mail Caption The 3-D structure shows the tunnel where the enzyme feeds in the cellulose chains for digestion. The red color represents the highly acidic surface that allows it to be stable and active in very high salt condition. Credit John McGeehan, the University of Portsmouth Usage Restrictions None Share Print E-Mail 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.