1KGP:
reference: Crystal structure of the di-iron/radical protein of ribonucleotide reductase from Corynebacterium ammoniagenes., Hogbom M, Huque Y, Sjoberg BM, Nordlund P, Biochemistry 2002 Jan 29;41(4):1381-9. PMID: 11802741

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