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. Author manuscript; available in PMC: 2015 Apr 9.
Published in final edited form as: Chem Rev. 2014 Mar 3;114(7):3659–3853. doi: 10.1021/cr400327t

Figure 183.

Figure 183

Proposed reaction scheme showing the two possible pathways for the reduction of the oxidized pulsed form of the binuclear center in CcO. Block arrows represent proton pumping that is absent when OH decays to O and gets reduced.