Fig. 3

Structural content of the terminal regions including the UTRs of the 11 viral species. a Structural content (% double-stranded nucleotides) for all the genomes for the 11 species for the terminal region including the 5′ UTR. To have an equal comparison between the different species, we considered the 5′ UTR included in the first 1000 nt. The name used for the viruses is reported in Table 1. b Structural content (% double-stranded nucleotides) for all the genomes for the 11 species for the terminal region including the 3′ UTR. To have an equal comparison between the different species, we considered the 3′ UTR included in the last 1000 nt. c The difference for each individual genome between the structural content of the terminal regions including the 5′ and 3′ UTR. Viruses with more structured terminal region including the 5′ UTR are > 0 (blue area), while < 0 indicates more structured 3′ UTRs (green area)