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- Molecular structure of a stacked Holliday junction, in which the four arms stack into two double-helical domains. Note how the blue and red strands remain roughly helical, while the green and yellow strands cross over between the two domains. (en)
- Molecular structure of an unstacked Holliday junction. This conformation lacks base stacking between the double-helical domains, and is stable only in solutions lacking divalent metal ions such as Mg2+. From . (en)
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