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The bridge domain of Arabidopsis and Polytomella complex I (CI). A and B, Interaction of the bridge domain with the membrane arm near the γCA domain (orange) and the Q domain of the peripheral arm (blue). C and D, Structure of the C1-FDX subunit in Arabidopsis and Polytomella. E and F, catalytic sites of C1-FDX in Arabidopsis and Polytomella. For details, see Supplemental Figures S21 and S22.
