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Schematic representing the genome segments present in minimal viruses. The coding regions, not to scale, are in gray. The UTRs, to scale, are in black. For each set of three, the top segment represents the L genome, the middle segment represents the M genome, and the bottom segment represents the S genome, with the 3′ UTR on the right of the coding sequence and the 5′ UTR on the left. The abbreviated segment designations are given in Table 1.
