When such stems find support this nutational movement may become fixed into a helical winding.
2.
This is normally a helical winding, similar to BX cable, or a series of straight fibers running parallel to the core.
3.
Drawing showing the difference between a circular DNA chromosome ( a plasmid ) with a secondary helical twist only, and one containing an additional tertiary superhelical twist superimposed on the secondary helical winding.
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