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Crystal packing in (a) SEPT9GC–GDP and (b) SEPT3α0G–GDP. In both cases the view is along the filaments within the crystal. In (a) the interaction between the central filament (blue) and its neighbours (red) appears to be fragile owing to relatively few crystal contacts. Presumably, it is the paucity of these contacts which permits the filaments to shrink on soaking with GTPγS. In (b) SEPT3α0G–GDP, which has a slightly tighter packing, is shown for comparison.
