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MOCOS sulfurates the molybdenum cofactor of xanthine dehydrogenase (XDH) and aldehyde oxidase (AOX1), which is required for their enzymatic activities.  References ^ a b Ichida K, Matsumura T, Sakuma R, Hosoya T, Nishino T (Apr 2001). — “MOCOS - Wikipedia, the free encyclopedia”, en.wikipedia.org