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Effects of the seventh position of the slippery site on −1 frameshifting in different translational systems. (A) Effects with a SARS-like slippery site. (B) Effects with a (L–A)-like slippery site. Frameshifting efficiencies were determined and expressed as fold change of the SARS wild-type sequence (U UUA AAC) for each construct. The shading of the bars is the same as in Figure 1 ▶. P-values for fold change are in Table 1 ▶.
