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Primary sequence and secondary structure of the TMV U1 3′-UTR. Major structural domains are shown: the L-shaped TLS (nt 1 to 105 counted from the 3′ end) and the UPD, consisting of three consecutive PKs. The coat protein translational termination codon is boxed. Numbering of the PKs in the UPD is as indicated. This structure is derived from chemical and enzymatic probing data (21, 54, 61).
