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Alignment of the GP4 aa sequences of PRRSV strains LV, 07V063, and 08V204. The ORF4 sequences of PRRSV strain 07V063 and 08V204 were determined by PCR and cycle sequencing, and the deduced aa sequences were aligned to the GP4 sequence of LV. Dots represent residues that are identical to LV, and hyphens indicate gaps. Boxes indicate regions that are recognized by sera in pepscan analyses.
