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. 2017 Sep 23;73(Pt 10):541–549. doi: 10.1107/S2053230X17013073

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© International Union of Crystallography 2017

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Quinone-binding site of C. thermarum NDH-2. (a) A quinone-binding site viewed from the si face of the FAD flavin ring. A 2F _o − F _c map contoured at 1σ is shown as a grey mesh. (b) A view of (a) rotated by 40° clockwise. (c) The same view as (a) but without the electron-density map. (d) The same view as (b) but without the electron-density map. Ala316 is omitted for clarity in (a) and (c). Arg382 is omitted in (b) and (d) for clarity. Potential hydrogen-bonding interactions are shown by dashed lines in (c) and (d).