FIG. 8.

Conservation of the pseudoknot interaction in all known arteriviruses. The RNA secondary structure predictions for the two terminal stem-loop structures in different arterivirus genomes are shown. For all arteriviruses, a putative interaction between the top region of the terminal hairpin and the upstream hairpin is predicted and is marked in gray. Shown are EAV (Brucyrus [accession number NC002532]), SHFV (M6941 [accession number NC003092]), LDV (Plagemann [accession number U15146]), PRRSV (VR2332 [accession number U87392]), and PRRSV (Lelystad [accession number M96262]).