3NK6:
reference: Crystal Structure of the Nosiheptide Resistance Methyltransferase of Streptomyces actuosus., Yang H, Wang Z, Shen Y, Wang P, Jia X, Zhao L, Zhou P, Gong R, Li Z, Yang Y, Chen D, Murchie A, Xu Y, Biochemistry. 2010 Jun 15. PMID: 20550164

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