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. 2006 Aug 31;34(16):4506–4514. doi: 10.1093/nar/gkl616

Figure 1.

Figure 1

Schematic of a G-quartet plane formed by hydrogen bonding along the Hoogsteen and Watson–Crick faces of four guanines. Carbon atoms are shown in green, hydrogens are white, nitrogens are blue, oxygens are red and hydrogen bonds are drawn as black dashed lines.