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Supercoiling

Supercoiled Structure of Circular DNA
This is a supercoiled structure of circular DNA molecules with low writhe. Note that the helical nature of the DNA duplex is omitted for clarity.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Circular%20DNA%20Supercoiling."
http://en.wikipedia.org/wiki/File:Circular_DNA_Supercoiling.png
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