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. 2014 May;20(5):587–593. doi: 10.1261/rna.042457.113

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© 2014 Huang et al.; Published by Cold Spring Harbor Laboratory Press for the RNA Society

This article is distributed exclusively by the RNA Society for the first 12 months after the full-issue publication date (see http://rnajournal.cshlp.org/site/misc/terms.xhtml). After 12 months, it is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.

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FIGURE 1. — Four putative pseudoknots (PK1–PK4) at the gag-pol frameshift junction of HIV-1. (A) A schematic diagram for the four pseudoknot-forming sequences of PK1–PK4 in the reference strain HXB2 (GenBank accession No. K03455). The slippery sequence (ss, residues 2084–2091) UUUUUUA is highlighted in black. The numbers indicate the starting and ending residues of the pseudoknot-forming sequences. (B,C) Predicted secondary structures for the four putative pseudoknots PK1–PK4 in two representative strains. The slippery sequence is boxed.