Triplex Structures
This non-Watson-Crick base-pairing allows the third strands to wind around the duplexes, which are assembled in the Watson-Crick pattern, and form triple-stranded helices such as (poly(dA)•2poly(dT)) and (poly(rC)•2poly(rC)). It can be also seen in three-dimensional structures of transfer RNA.
Read more about this topic: Hoogsteen Base Pair
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