Supplementary Figure 8: Different families of G-quadruplex structures.
From: High-throughput sequencing of DNA G-quadruplex structures in the human genome

Left: canonical PQs predicted by Quadparser (L1-3=N1-7, with N=A|C|T|G). Middle: PQs with longer loops (L1-3=N8-12 or L2=N8-21). Right: PQs with a single bulge B1=H1-7 or multiple bulges B2=H1-5 (H=A|T|C).