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Northern blot analysis of periwinkle RNA. Total cellular RNAs were extracted, electrophoresed (15 μg per lane), subjected to Northern blot hybridization, and probed with 32P-labeled clone A2 (A) or stained with ethidium bromide (B). RNA was from healthy plants (lanes 1) or from an AY-infected plant (lanes 2). The base lengths of RNA are indicated on the left.
