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Figure 9
Helical diffraction. A helix can be considered as a 1D crystal, since it has a repeating structure along the axis giving rise to a set of layer lines in the diffraction pattern. If the symmetry of the helix is known, a full 3D reconstruction can be calculated from the untilted filament transform, since the subunit is imaged at different angles about the filament axis. The example shown is for the case of a helix with an integral number of subunits per helical pitch repeat.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 56| Part 10| October 2000| Pages 1215-1222
doi:10.1107/S0907444900010787
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