As an important non-canonical DNA secondary structure in vivo and in vitro, G-quadruplexes (GQs) have been widely investigated in many fields including biology, medicinal chemistry, supramolecular chemistry and nanotechnology. Vast GQs are primarily folded by one, two or four G-rich oligomers, rarely with an exception.
source https://phys.org/news/2021-03-scientists-dynamic-trimolecular-g-quadruplex.html
