Boxplots depict differences in SINE Alu RNA processing ratio 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. A p value 0.05 was considered as threshold for statistical significance for the comparisons between no AD and AD of each age group (unpaired non-directional t-test, with p=0.003 for the comparison below 85, and p < 0.001 for the other two comparisons and n numbers as in (E)). Boxplot representation as in subfigure 2D. 