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Schematic structure of TRV RNA-1. The 6.8 kb genomic ssRNA-1 of TRV (109) is designated by a double horizontal line. The positions of initiation and termination codons are indicated by closed triangles and circles, respectively. The first ORF codes for a non-structural protein of 134 kDa that is terminated by a UGA codon. Partial readthrough of this ‘leaky’ UGA stop codon yields the 194 kDa polypeptide (broken line).
