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Stereo images of the active sites of desulfo-XO with xanthine. Shown in A and B are the more highly occupied active site in each of the two dimers found in the asymmetric unit. Fo-Fc maps were constructed with omission of xanthine and overlaid with the final model (Protein Data Bank code 3EUB). The Fo-Fc maps were contoured at 3.0 σ. The molybdenum atom is in teal, sulfurs are in yellow, oxygens are in red, and nitrogens are in blue.
