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Particles of tobacco necrotic dwarf (TNDV) and potato leafroll (PLRV) viruses, both of which are phloem-limited and transmitted by aphids in the persistent manner, contain a single-stranded RNA of mol. wt. 2.0 × 106, estimated from their mobilities in polyacrylamide gel electrophoresis. The results suggest that both viruses belong to the group of luteoviruses. TNDV has two minor RNA components of mol. wt. approx. 1 × 105.
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