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/hot-price-U-S-POLO-ASSN-Blue-Cotton-Men-Sweater-p18350-great-buy/