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Mutations in the BWYV pseudoknot and their effects on −1 ribosomal frameshifting activity. The unmutated frameshifting efficiency in this experiment is 10.8%. The numbers near the mutations correspond to the frameshifting efficiency. (A) Mutations in the junction and loops, 1 and 2. (B) Mutations and inversions in stem 1 and stem 2 base pairs. (C) Mutations at the stem 1–loop 2 linker.
