Additional file 2.

Age effects in different brain regions. Scatterplots of correlation test P-values for correlations between age and methylation profiles in the four brain regions (data sets 7 to 10). Overall, these P-values are highly correlated, which shows that age has a similar effect in all four brain regions.

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Horvath et al. Genome Biology 2012 13:R97   doi:10.1186/gb-2012-13-10-r97