Boxplots depict full length Alu RNA levels in cortex of AD and no AD patients separated into three age groups. No significant difference observed between the different age groups of either AD or no AD patients or for the comparisons between no AD and AD of each age group (unpaired non-directional t-test, with p<0.05 considered the threshold for statistical significance, n for no AD=19 (below 85), 19 (between 85 to 90), 13 (above 90); n for AD=8 (below 85), 21 (between 85 to 90), 38 (above 90)). Boxplot representation as in subfigure 2D. 