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Folding topology and solution structural model of the phage T2 gene 32 autoregulatory pseudoknot (PDB 2TPK) in which the two pseudoknot stems S1 and S2 are coaxially stacked on one another (Du et al., 1996, Holland et al., 1999). The small arrow indicates the position of pseudoknot loop L3, when present, while the large vertical arrow indicates the direction of approach of the translocating ribosome.
