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A:C base pair in the Pol IV active site. The Ser42 and other residues lining the active site are coloured according to element and shown in stick representation. Water molecules are shown in the form of red spheres. The direct and water-mediated interactions formed between Ser42 and the O2 atom of incoming dCTP and N3 atom of dA, respectively, are shown in the form of dotted lines.
