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Tt/Sc eRF1 stimulates programmed +1 frameshifting at all termination codons. The efficiency of programmed frameshifting on three shifty stop frameshift sites and one nonshifty stop frameshift site, as indicated, was measured in the presence of S. cerevisiae eRF1 (Sc eRF1) or the T. thermophila/S. cerevisiae chimeric enzyme (Tt/Sc eRF1). Error bars, SEM.
