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A, Matrix view of the FO complex monomer structure, with the domain formed by subunits e and g, and the N-terminal α-helices of subunit b enclosed by a dashed line. B, Fold of subunit a. C, Side view of the FO monomer showing that subunits 8, f, and b, contribute to the base of the peripheral stalk, with subunit d acting as a clip. Scale bar, 25 Å.
