1) Supercoil 
A superhelix is a molecular structure in which a helix is itself coiled into a helix. This is significant to both proteins and genetic material, such as overwound circular DNA. The earliest significant reference in molecular biology is from 1971, by F.B. Fuller: About the writhing number, mathematician W.F. Pohl says: Contrary to intuition a topol...
a coil formed by intertwined helical DNA or by protein chains. Also called