“…70 to 90 nucleotides upstream of the poly(A) tail in TVMV, TEV, PeMV and PPV-NAT may also represent a polyadenylation signal as demonstrated for yeasts, where this region is located 30 to 40 nucleotides in front of the poly(A) tail (Zaret & Sherman, 1982). This sequence was also found in the 3' non-coding region of tomato black ring virus RNA-1 (Greif et al, 1988) and RNA-2 (Meyer et al, 1986), and CPMV (van Wezenbeek et al, 1983;Lomonossoff & Shanks, 1983); these viruses also contain plus-sense, monocistronic polyadenylated RNAs.…”