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Guanine (G) rich G(4)T(4)G(4) DNA and homologous PNA strands tend to form antiparallel dimeric quadruplexes. In contrast, the same DNA strands carrying planar aromatic 5'-residues preferentially form parallel DNA quadruplex. Conformation and composition of the DNA quadruplexes can be programed by pi-pi-stacking interaction exerted by the 5'-residues.

Programing the formation of DNA and PNA quadruplexes by π–π-stacking interactions