
Histogram of the distribution of the length of A-tail in different subgroups of Alu and L1 elements. Distribution of the A-tail length of Alu elements belonging to old subfamilies (Alu J and S), the young subfamily Alu Ya5, and those reported to cause disease (see text for definition), plus the L1 elements from the young Ta (Ta0 and Ta1) and those linked to disease. Note: The scale for the Y-axis (number of elements) is different for each group.











