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. Author manuscript; available in PMC: 2013 Jul 29.
Published in final edited form as: Nat Rev Genet. 2012 Oct 3;13(11):770–780. doi: 10.1038/nrg3296

Figure 1. G-quadruplex DNA.

Figure 1

a | An illustration of the interactions in a G-quartet. This quartet is represented schematically as a square in the other panels of this figure. M+ denotes a monovalent cation. b | Schematic diagrams of intramolecular (left) and intermolecular (right) G-quadruplex (G4) DNA structures. The arrowheads indicate the direction of the DNA strands. The intermolecular structures shown have two (upper) or four (lower) strands.