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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Bioessays. 2017 Jul 13;39(9):10.1002/bies.201700077. doi: 10.1002/bies.201700077

Figure 1.

Figure 1

DNA structures formed by simple DNA repeats. A: H-DNA formed by GAA/TTC sequences. As shown, the homopurine (GAA) strand is donated to the triplex. Dots indicate Watson-Crick base pairing. Asterisks indicate reverse Hoogsteen base pairing. B: Imperfect hairpin formed by (CNG)n repeats. C: G-quadruplex formed by (CGG)n repeats. Grey squares represent hoogsteen basepairing between four guanines. D: The G-rich strand of telomeres can form G guadruplex structures. One possible example is shown here. The T-loop results from invasion of the single-stranded telomeric 3′-overhangs into the upstream telomeric duplex DNA.