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The active site of nitrogenase from A.vinelandii (Einsle et al., 2002; Lancaster et al., 2011; Spatzal et al., 2011). The metal cofactor–homocitrate complex is shown as balls and sticks and the residues found to be within 5 Å of the cofactor are shown as lines (thin). Colors: light blue, carbon; blue, nitrogen; red, oxygen; yellow, sulfur; rust, iron; cyan, molybdenum.
