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. 2017 Sep 20;7:11969. doi: 10.1038/s41598-017-10583-9

Figure 4.

Figure 4

Examples of structural (ac) and biological (dg) contexts in which both duplex and quadruplex elements exist in close spatial proximity. (a) A quadruplex immediately up-/downstream of a duplex. (b) A quadruplex-duplex hybrid. (c) A quadruplex and a duplex formed by distinct strands. (d) Formation of quadruplexes at the telomere end. (e) Formation of a quadruplex during replication. (f) Formation of a quadruplex at the transcription start site. (g) Formation of a DNA-RNA quadruplex-duplex hybrid during transcription. The RNA transcript is shown in red.