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Electron density (|Fo − Fc|) for hypothiocyanate ion bound in distal heme cavity, contoured at 2.5 σ level. Residues Gln-105 and His-109 on distal site and His-351 on proximal site are also shown. Positions of α-helices H2 and H8 with respect to heme group are also indicated. Two opposite orientations (a and b) are shown for clarity of interactions with OSCN− ion.
