4M1H:
reference: Structural Basis for Assembly of the Mn/Fe Cofactor in the Class Ic Ribonucleotide Reductase from Chlamydia trachomatis., Dassama LM, Krebs C, Bollinger JM, Rosenzweig AC, Boal AK, Biochemistry. 2013 Aug 7. PMID: 23924396

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