Figure 2
From: Guanine quadruplexes are formed by specific regions of human transposable elements
The abundance of PQSs inside LINE-1, SVA and Alu elements related to the element length, activity or age. (a) The abundance of PQSs inside all LINE-1, full-length LINEs and active LINEs (L1HS and L1PA2) located on autosomes and X and Y chromosomes. (b) The abundance of PQSs inside SVA of different age (oldest SVA-A to youngest SVA-F) located on autosomes and the X and Y chromosomes. (c) The abundance of PQSs upstream inside and downstream of Alu elements of different age (oldest Alu-J, middle-aged Alu-S and youngest Alu-Y) located on autosomes and the X and Y chromosomes.