4FHF:
reference: Structural insights into recognition and repair of UV-DNA damage by Spore Photoproduct Lyase, a radical SAM enzyme., Benjdia A, Heil K, Barends TR, Carell T, Schlichting I, Nucleic Acids Res. 2012 Jul 2. PMID: 22761404

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