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. 2013 Sep 13;14(9):R102. doi: 10.1186/gb-2013-14-9-r102

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Copyright © 2013 Day 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 cited.

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Bar graphs displaying the percentages of ageCGs classified by CpG context and positive or negative association with age across four human tissues. (A) Percentage of total ageCGs that exhibited a positive or negative association with age in each tissue. (B,C) Percentage of positively associated (B) and negatively associated ageCGs (C) positioned within CpG islands, shores, or other. (D-F) Percentages of positively or negatively associated ageCGs each classified within CpG islands (D), CpG shores (E), or CpG other contexts (F). P-values are below bar graphs that resulted from Pearson’s Chi-squared tests between number of positive or negative associations across tissues in each respective CpG context.