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pseudoknot

n. (context genetics English) A secondary structure in RNA in which half of one stem is intercalated between the two halves of another stem.

Wikipedia
Pseudoknot

__NOTOC__ A pseudoknot is a nucleic acid secondary structure containing at least two stem-loop structures in which half of one stem is intercalated between the two halves of another stem. The pseudoknot was first recognized in the turnip yellow mosaic virus in 1982. Pseudoknots fold into knot-shaped three-dimensional conformations but are not true topological knots.