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Structure of a bacterial nucleoid, showing independent domains of supercoiling

Structure of a bacterial nucleoid, showing independent domains of supercoiling
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Description: Structure of a bacterial nucleoid, showing independent domains of supercoiling, each stabilized by binding to protein:

The term plectonemic refers to the type of supercoiling observed, with DNA strands intertwined in a regular way.

The 1000 nm diameter of the structure allows it to fit within a bacterial cell that may be 2 to 5 mm in length.

An alternative form of negative supercoiling, solenoidal, allows greater compaction and is seen in chromatin.

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