We have pulled apart the two strands of a DNA double helix. The forces measured during this process show a sequence specific variation on the piconewton scale. Opening two helical molecules with the same sequence from opposite sides gives two signatures which are not simply related by symmetry. In a theoretical model, this is explained as a molecular stick-slip motion which does not involve instabilities and is determined by the sequence.
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Bockelmann et al. (1997) studied this question.
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