4BMP:
reference: Crystal Structure of Bacillus cereus Class Ib Ribonucleotide Reductase Di-iron NrdF in Complex with NrdI., Hammerstad M, Hersleth HP, Tomter AB, Rohr AK, Andersson KK, ACS Chem Biol. 2014 Feb 21;9(2):526-37. doi: 10.1021/cb400757h. Epub 2013 Dec 11. PMID: 24295378

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