Figure 1. Triplex nucleic acids.

Figure 1

Triplex nucleic acids. A) Schematic representation of an intermolecular triplex. The third strand (black) is seen residing in the major groove of duplex DNA. Note that this third strand may be part of a larger molecule (dotted line extensions). B) Base triplets and strand orientations in the pyrimidine motif. C) Base triplets and strand orientations in the purine motif.

From: Do DNA Triple Helices or Quadruplexes Have a Role in Transcription?

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