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. Author manuscript; available in PMC: 2008 Oct 13.
Published in final edited form as: J Am Chem Soc. 2007 Aug 2;129(33):10220–10228. doi: 10.1021/ja072185g

Figure 2.

Figure 2

Schematic diagram of a G-quadruplex and an i-motif structure. (A) Four guanines form a G-tetrad through Hoogsteen bonds, and three G-tetrads form a parallel G-quadruplex structure in the c-Myc promoter. (B) Hemiprotonated cytosine–cytosine base pair. Two C+–C pairs form an intermolecular i-motif structure.