Fig. 8.

Porcine arterivirus contains an inter-typically conserved long bulged stem-loop in 3′ UTR. Mfold program was used for analysing the predicted secondary structures of the 3′ UTR of PRRSV, followed by RNAviz drawing of the structure; (A). the structure for the entire 3′ UTR consensus sequence, obtained from comparison of the available type I PRRSV cited in Fig. 1; (B). The predicted structure from the consensus sequence of the last 111 nt of the type II 3′ UTR, generated from 100 available GenBank deposited sequences (Accession No. available upon request).