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Organization and expression strategy of genomes characteristic of Citrus tristeza virus. Dashedlines represent putative protein products corresponding to the respective ORFs. +1 FS the putative ribosomalframeshift. Solid lines define the two genomic regions expressed through proteolytic processing of thepolyprotein precursor(s) and through the formation of a nested set of 3′ co-terminal sgRNAs (from Karasev andHilf, 1997).
