Figure 5. Unwound (unpaired) DNA.

Figure 5

Unwound (unpaired) DNA. A) A representation of an unpaired region within a B- DNA helical region is shown. This structure, typically called unwound DNA, is formed under superhelical tension within A+T rich DNA regions. B) Unwound regions in supercoiled plasmids, formed within (ATTCT)23•(AGAAT)23 tracts from the human SCA10 gene.

From: DNA: Alternative Conformations and Biology

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