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Structures and sequences of 3′ UTRs. (A) Secondary structure of the PV3 3′ UTR. (B) Structure of the HRV14 3′ UTR showing the sequence change at the base of the stem to generate mut4. (C) Conserved sequence at the base of the 3′ stem of human rhinoviruses. (D) The 3′ UTR sequence remaining after removal of the stem-loop to generate HRV14.Δ3′.
