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Predicted RNA secondary structures of the 83-nt sequence duplicated in the 3′-terminal region of the genomic RNAs of MUTΔ1-450-derived pseudorevertants. Shown are two pairs of four predicted stem-loop structures: one for a single copy of the 83-nt sequence (A) and the other for a tandem repeat of the 83-nt sequence (B). Also indicated are the initial thermodynamic free energies (ΔG, in kilocalories/mole) of all four potential structures, as determined by the RNA folding program mfold.
