Boxplots depict differences in hippocampi of AD and no AD patients regarding SINE Alu RNA processing ratio (left panel) (a p value of 0.05 was considered as threshold for statistical significance with p=0.01 , n=24, unpaired non-directional t-test) and in total Alu RNA levels (right panel) (ns=not significant). In the boxplots, the central band (the line that divides the box into 2 parts) represents the median of the data, the ends of the box shows the upper (Q3) and lower (Q1) quartiles, the extreme line shows Q3+1.5xIQR to Q1-1.5xIQR (the highest and lowest value excluding potential outliers), while dots beyond the extreme line show potential outliers. 