NiFe-Hydrogenase Release (IMAGE) Indiana University Caption This is an illustration showing the release of NiFe-hydrogenase from inside the virus shell, or 'capsid,' of bacteriophage P22. Credit Indiana University 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.