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Figure 2
FoFc map and ball-and-stick structure model around the binuclear O2-reduction center consisting of CuB (blue) and heme Fea3 (red), with and without a ligand peroxide model. (a) FoFc difference peaks (black mesh), depicted at the 10σ level (1σ = 0.064 e Å−3). (b) Structural model with ligand peroxide of 1.55 Å bond length, consisting of 90% major (thick red stick) and 10% minor (thin red stick) components. The difference map is depicted at the 2.5σ level (1σ = 0.063 e Å−3). Numerical values adjacent to the peroxide show the distances in angstroms (Å).

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