supercoil

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supercoil

(so͞o′pər-koil′)
n.
A structure of a helix, especially a DNA molecule, in which the axis of the helix itself is coiled, causing the helix to loop over itself.
intr.v. super·coiled, super·coiling, super·coils
To form a supercoil.
References in periodicals archive ?
They suggest that the degree to which these DNA supercoils tighten and loosen influences which genes are active in a cell.