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The structure of nitrogenase showing the Fe protein and the MoFe protein complexed with each other. Positions of the metal centres (black) are indicated. The MoFe protein is an α2β2 of different subunits (red and blue) and it contains two ‘P-clusters’ and two MoFe cofactors. The Fe protein (green) has a [4Fe-4S] cluster and it is also the site of binding and hydrolysis of Mg-ATP.
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