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Math Shows How DNA Twists, Turns and ­nzips

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DNA knot

DNA knot as seen under the electron microscope.

Credit: Javier Arsuaga, CC BY-ND

If you've ever seen a picture of a DNA molecule, you probably saw it in its famous B-form: two strands coiling around each other in a right-handed fashion to form a double helix. But did you know that DNA can change its shape?

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