4B2M:
reference: The flavoprotein dodecin as a redox probe for electron transfer through DNA., Yu Y, Heidel B, Parapugna TL, Wenderhold-Reeb S, Song B, Schonherr H, Grininger M, Noll G, Angew Chem Int Ed Engl. 2013 Apr 26;52(18):4950-3. doi: 10.1002/anie.201208987., Epub 2013 Mar 26. PMID: 23532984

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