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![[Figure 2]](rr5133fig2mag.jpg)
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Figure 2
Subgroup–supergroup relation between crystal forms 1 and 2. (a) Black and orange colours designate crystallographic symmetry and pseudosymmetry elements, respectively, in the form 2 crystal. All of these elements are crystallographic symmetry elements in form 1, which has to be rotated by −45° about c and translated by b/2 from its standard setting for the corresponding symmetry elements to overlay as shown. (Note that both diagonal pseudosymmetry twofold axes and diagonal crystallographic screw twofold axes in form 2 correspond to crystallographic coordinate twofold axes in form 1.) The black rectangle represents the unit cell in form 2 and the orange rectangle represents the rotated and translated unit cell of form 1. (b, c) The Patterson maps for (b) form 1 and (c) form 2 are coloured blue at 0.03 of the height of the origin peaks and the unit cells are shown as yellow rectangles. The full resolution range of the experimental data was used, and hence the Patterson peaks are narrower for form 2, which diffracted to higher resolution. Peaks 1 and 1′ are origin peaks and the heights of other peaks relative to the corresponding origin peaks are 0.30 for peak 2, 0.21 for peak 2′ and 0.10 for peak 3′. All non-origin peaks are split along c and their fractional coordinates along c are 0.5 ± 0.017 for peak 2, 0.0 ± 0.005 for peak 2′ and 0.5 ± 0.017 for peak 3′. Peaks that are not labelled are generated from equivalent peaks by crystallographic translations. Unlabelled images for (b) and (c) were obtained using Coot. |
![[Figure 2]](rr5133fig2.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
