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. 2015 Mar 25;10(3):e0122176. doi: 10.1371/journal.pone.0122176

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© 2015 Mathew et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — A. The HIV-1 M-type frameshift element intercodon within the dual luciferase construct used in this study. B. Identity and frequency of the intercodon from sequences in the Los Alamos HIV sequence database as described in Methods. C. Sequence logo of the HIV-1 slippery sequence and downstream nucleotides spanning positions 2085–2101 (HBX2 numbering). The intercodon is underlined.