4MN7:
reference: Structural and biochemical analysis of a type II free methionine-R-sulfoxide reductase from Thermoplasma acidophilum., Kim HS, Kwak GH, Lee K, Jo CH, Hwang KY, Kim HY, Arch Biochem Biophys. 2014 Jul 17. pii: S0003-9861(14)00252-5. doi:, 10.1016/j.abb.2014.07.009. PMID: 25043974

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