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Northern blot detection of GPGV in samples collected at (a) Eger and (b) Tokaj. Vitis indicates RNA extracted from grapevine, Rosa from rose, and Rubus from Rubus, while Nb indicates RNA extracted from Nicotiana benthamiana used as a negative control. – and + indicate RT-PCR results for GPGV in same samples. Radiolabeled probe was used for hybridization. rRNA on EtBr-stained gel served as loading control.
