Fig. 2.

PRRSV-01 virus naturally lacks two N-glycosylation sites in its envelope glycoproteins. Multiple-sequence alignments of GP3 (A) and GP5 (B) collected from the NCBI database. Only regions that cover the potential N-linked glycosylation sites are shown. Asparagine (N) residues that contain the potential N-glycosylation sites are shown in boldface type. Positions in the PRRSV-01 sequence where the glycosylation sites are absent compared to other porcine reproductive and respiratory syndrome virus (PRRSV) strains are shown on a gray background.