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. 2008 Aug 8;4(8):e1000124. doi: 10.1371/journal.pcbi.1000124

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Waldispühl 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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The x-axis represents the number of mutations, while the y-axis represents the (normalized) frequency of base pairs (i, j) (i<j) over all windows containing both extremities i, j. Results are classified into five different instances: (1) i and j belong to the same stem region, (2) i and j are in two different stem regions, (3) i is in a stem region and j is not, (4) j is in a stem region and j is not, and (5) neither i nor j belong to any stem region.