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Superposition of six best-fit NMR-derived structures of Fe-HsARD. Superposition derived from the CA atom positions of residues 1:6 and 27:165. Iron atoms are shown as light blue spheres. Mean deviation between all structures is 1.013 Å. Structures are shown approximately as in Figure 2, for comparison. C-term residues 166:178 are not shown, as they are disordered in solution.
