A number of metal centers grouped close together which can have direct metal bonding interactions or interactions through a bridging ligand, but are not necessarily held together by these interactions. Examples canbe found under the entries [2Fe-2S), [4Fe-4S], ferredoxin, HiPIP, iron-sulfur cluster, FeMo-cofactor, ferritin, metallothionein, nitrogenase, and Rieske iron-sulfur protein.
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