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Overview of the nitrogenase MoFe-protein structure. (a) Quaternary structure of the nitrogenase MoFe-protein heterotetramer. α-subunits are shades of green and yellow; β-subunits are shades of blue and purple. (b) Metallocluster architecture of the active site FeMo-cofactor (top) and the P-cluster (bottom; PDB code 3U7Q).
