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. 2014 May 6;9(5):e92475. doi: 10.1371/journal.pone.0092475

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© 2014 Biton et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Inline graphic — If one loop has its two termini in relative orientation and displacement that is in accord with one of the loop topological groups, and the second loop has its terminal base pair in coincidence with that of the first loop, the two termini of the loops at differ in their orientation by an angle about .

If one loop has its two termini in relative orientation and displacement that is in accord with one of the loop topological groups, and the second loop has its terminal base pair in coincidence with that of the first loop, the two termini of the loops at differ in their orientation by an angle about .