5XLE:
reference: Ni-elimination from the active site of the standard [NiFe]hydrogenase upon oxidation by O2., Nishikawa K, Mochida S, Hiromoto T, Shibata N, Higuchi Y, J Inorg Biochem. 2017 Dec;177:435-437. doi: 10.1016/j.jinorgbio.2017.09.011. Epub, 2017 Sep 14. PMID: 28967475

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).