3FGC:
reference: Crystal Structure of the Bacterial Luciferase:Flavin Complex Provides Insight into the Function of the subunit., Campbell ZT, Weichsel A, Montfort WR, Baldwin TO, Biochemistry. 2009 May 12. PMID: 19435287

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