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CalO6 homology model based upon mitomycin-7-O-methyltransferase, MmcR (PDB: 3GWZ) with the distances between the putative catalytic histidine (His252) and hydroxyl groups of C2- and C4- of SNAC-OSA indicated. In the stick model, SAH and SNAC-OSA are shaded dark, and CalO6 residues proposed to take part in the catalysis are in light grey.
