ADP-Ribosylation of Hemopexin (IMAGE) University of Zurich Caption The enzyme ARTC1 (red) modifies hemopexin (blue) at defined sites by adding ADP ribose (yellow) and thus impairs the binding strength of heme (white). Credit Kapila Gunasekera, University of Zurich 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.