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Figure 3
Interactive display of Fourier transforms from helical structures in Ximdisp. In this mode, the filament is boxed (a), then vertically aligned (inset) before calculation and display (b) of the transform. It is possible to sample the quality of various parts of the filament prior to selection by moving the box and re-calculating the transform. The illustration shows an acetyl­choline receptor tube (see Unwin, 2005BB35; and EMD-11239).

ISSN: 2052-2525