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Computer-modeled secondary structures of PV 3′ RNA sequences with and without a 3′ NCR. RNA sequences corresponding to nucleotide positions 7287 through 7441 of wild-type PV1 or nucleotide positions 7287 through 7373 of Δ3′ NCR PV1 include 24 A residues of the 3′ poly(A) tract. Minimum-free-energy values are indicated below each structure. The first stop codon is boxed in each structure, and proposed stem-loop structures X and Y of the 3′ NCR are indicated on the wild-type structure.
