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PCR analysis of periwinkle chromosomal DNA (100 ng per reaction). PCR primers were derived from clone A380 (Tables 1 and 2), amplifying a 500-bp region. Template DNA was from a healthy plant (lane 1), from an AY-infected plant (lane 2), from a Stolbur-infected plant (lane 3), or from clone A380 as a positive control (lane 4), Lane M, molecular size markers.
