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Chromatography of crude RNA extract from PSTVd-infected tomato plants. (A) Preparative chromatographic fractionation of 30 mg RNA crude extract from viroid-infected plants on a DMA-500 column. (B) Gel electrophoretic analysis (5% PAGE, denaturing conditions) of fractions as in (A); the non-chromatographed sample is shown in slot M. Modified from (74).
