4N82:
reference: Streptococcus sanguinis Class Ib Ribonucleotide Reductase: High Activity with Both Iron and Manganese Cofactors and Structural Insights., Makhlynets O, Boal AK, Rhodes DV, Kitten T, Rosenzweig AC, Stubbe J, J Biol Chem. 2013 Dec 31. PMID: 24381172

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