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Structure of diferric site from PDB # 1MXR crystal structure.33,34 Ellipse encloses the portion of this center assumed to be a good representation of the corresponding structure of the Fe(III) site of X. Arrow indicates the proposed orientation of g1. Although the g-tensor is fixed by the properties of the Fe(IV) ion of X, assigned as Fe(2), it is translated to His118 for visualization of the relative orientation of the Fe(1)-O bond.
