Supercoiled structure of linear DNA molecules with constrained ends. Note that the helical nature of the DNA duplex is omitted for clarity. Note: This illustration includes 2 minor errors; the plectonemic illustrations of writhe ±2 show writhe ±3. Otherwise the image is correct.

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Supercoiled structure of linear DNA molecules with constrained ends. Note that the helical nature of the DNA duplex is omitted for clarity. Note: This illustration includes 2 minor errors; the plectonemic illustrations of writhe ±2 show writhe ±3. Otherwise the image is correct.