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Secondary structure of Tomato chlorotic dwarf viroid (TCDVd) and Potato spindle tuber viroid (PSTVd) sequence variants. (A) TCDVd; (B) PSTVd variants I to VIII. TL: left terminal region, P: pathogenic region, C: central conserved region, V: variable region, TR: right terminal region. The shaded nucleotides are nucleotides that were different from variant I, which is identical to the TCDVd sequence AF162131 (A) or the PSTVd sequence EF044303 (B).
