1JPR:
reference: Crystal structures of oxidized dinuclear manganese centres in Mn-substituted class I ribonucleotide reductase from Escherichia coli: carboxylate shifts with implications for O2 activation and radical generation., Hogbom M, Andersson ME, Nordlund P, J Biol Inorg Chem 2001 Mar;6(3):315-23. PMID: 11315567

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