Active Site (image) Nara Institute of Science and Technology Share Print E-Mail Caption Protons are transferred between the NiFe active site and protein surrounding through the Cyt546 and Glu34 residues during the catalytic reaction of [NiFe] hydrogenase. Credit Shun Hirota Usage Restrictions This image may be used only with appropriate credit. 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.