A molybdenum cofactor is a biochemical cofactor that contains molybdenum.
Examples include:
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Molybdopterin (or, strictly speaking, the molybdopterin-molybdenum-complex), the organophosphate-dithiolate ligand that binds molybdenum and tungsten in most molybdenum- (except nitrogenases) and all tungsten-containing proteins
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FeMoco, a metal cluster that contains Fe, Mo, and S that is found in some nitrogenases
