?:definition
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The formation of a cluster of several metal atoms, including iron, nickel, molybdenum, vanadium, or copper, with one or more bridging (mu-bond) sulfur atoms; amino acids residues in proteins that may ligate the metal sulfur cluster are cysteine, histidine, aspartate, glutamate, serine and cysteine persulfide. [GOC:jsg]
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