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Structure of the FeMo-cofactor. The atoms of the cluster are shown in spheres and colored by element (Fe, orange; S, yellow; C, gray; Mo, cyan). Fe sites in the trigonal prism around the interstitial carbon are labeled with bold print. Belt S are also labeled and underlined. Coordinating residues and the R-homocitrate are shown in sticks and colored by element (C, gray; O, red; N, blue).
