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Figure 7.
Figure 7 Schematic representation of the crystal-packing
interactions between superhelical molecules. (a) As an example,
in P4[1]2[1]2 there are two repeats (numbered 1-8) within the
asymmetric unit (indicated as AU; red box). For this arrangement
there are eight equally possible two-repeat arrangements for the
asymmetric unit. (b) Schematic illustration of the stacking of
helices between repeats of individual molecules. The first
A-helix of the next molecule must always pack against the last
repeat of the previous molecule and therefore the C-terminal
capping helix must be displaced. (c) Ribbon representation of
the superhelical stacking with each single repeat coloured
yellow or blue.
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