3ZFS:
reference: De novo modeling of the F420-reducing [NiFe]-hydrogenase from a methanogenic archaeon by cryo-electron microscopy., Mills DJ, Vitt S, Strauss M, Shima S, Vonck J, Elife. 2013;2:e00218. doi: 10.7554/eLife.00218. Epub 2013 Mar 5. PMID: 23483797

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