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Proposed molecular mechanism of key nucleotides causing mild symptoms of PSTVd-Dwt in tomato. The structural/functional domains of PSTVd: Terminal left (TL), Pathogenicity (P), Central (C), Variable (V), and Terminal right (TR), are delimited by the vertical dotted lines and are named accordingly. Boxed sequences indicate central conserved region (CCR). Positions of nine mutations are indicated by arrows, and those in green box indicate key nucleotides identified in this experiment.
