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Structure of the antiporter-like subunit interfaces in the membrane domain of complex I. The figure shows A) the Nqo13-Nqo14 interface, B) the Nqo11-Nqo14 interface, and C) the Nqo13-Nqo12 interface. Ion pairs between conserved charged residues form alternating contacts within the same and neighboring subunits, with snapshots of intra-subunit contacts (to the left) and inter-subunit contacts (to the right).
