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(a) Structural overview of the MMOH protein, and its three subunits (α, yellow; β, green; γ, red), with the α subunit harboring the diiron site. (b) Abbreviated reaction cycle of MMOH, featuring the resting state MMOHox, MMOHred, and the MMOHQ intermediate. Note that for MMOHox the protonation states of the μ-oxo bridges are not unambiguously resolved.
