The process in which a transformation is induced in the geometry of a DNA double helix, resulting in a change in twist, writhe, or both, but with no change in linking number. Includes the unwinding of double-stranded DNA by helicases. [ GOC:mah ]
This is just here as a test because I lose it
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goslim_pir
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Note that DNA geometric change and DNA topological change (GO:0006265) are distinct, but are usually coupled in vivo.