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. 2014 Jun 19;15:206. doi: 10.1186/1471-2105-15-206

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Copyright © 2014 Paten et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Examples of ping-pong adjacencies. (A,B,C) The ping-pong adjacencies are shown in blue. (D,E,F) After modifications to remove the ping-pong adjacencies, for each corresponding left side case, with the added elements shown in red.