Nucleic acids rich in guanine are able to fold into unique structures known as G-quadruplexes. G-quadruplexes consist of four tracts of guanylates arranged in parallel or antiparallel strands that are aligned in stacked G-quartet planes. The structure is further stabilized by Hoogsteen hydrogen bonds and monovalent cations centered between the planes. https://www.diegojavierfares.com/amazing-price-Kicker-48CDF104-Comp-10-Down-Firing-Loaded-Subwoofer-Enclosure-special-find/