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thumb|300px|This example of a naturally occurring pseudoknot is found in the RNA component of human telomerase. Sequence from Chen and Greider (2005). thumb|300px|Three dimensional structure of almost the same pseudoknot from telomerase RNA. (A) sticks (B) backbone. The pdb-file is based on . Colors: A U C G __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 k