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Comparisons of the heme pockets of the sw ferric MbIII–H2O (in green), ferrous deoxyMbII (in magenta) and ferric MbIII–nitrite (in cyan) adducts. A) the wt adducts (rmsd 0.51 Å), (B) the H64A adducts (rmsd 0.13 Å), (C) the H64Q adducts (rmsd 0.14 Å), and (D) the V68A/I107Y adducts (rmsd 0.70 Å).
