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Schematic representation of transgenes. P35S: Cauliflower mosaic virus 35S promoter; TNOS: nopaline synthase (NOS) terminator; GFP: green fluorescent protein; intron: S. lycopersicum intron 3; 98: 98 bp PSTVd subfragment: PSTVd: full-length PSTVd cDNA; (+): plus orientation; (−): minus orientation.
