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Schematics of the considered pumping model (c.f. [33]). The numbers correspond to the kinetic phase order observed in the experiment. BNC is the binuclear catalytic center, PLS is the Proton Loading Site of the pump. For O to E transition discussed in the text, the third phase presumably corresponds to proton transfer to BNC along the K-channel; in other transitions, the same transition may occur along the D-channel.
