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Long-distance down-regulation of transcription. (a) Target GFP transgene and flanking 35S:BAR selectable marker. (b) Northern blot analysis of BAR transcript levels in WT GFP-silenced scions grafted onto WT S2 rootstocks. (c) Northern blot analysis of BAR transcript levels in WT and ago4 GFP-silenced scions grafted onto WT S2 rootstocks. (d) Northern blot analysis of GFP and BAR mRNA levels in nrpd1b silenced scions grafted onto WT S2 rootstock.
