Porcine Reproductive and Respiratory Syndrome Virus: Origin Hypothesis
Figure 4. Nucleotide alignment of a segment of open reading frame (ORF) 1b of lactate dehydrogenase-elevating virus–P, porcine reproductive and respiratory syndrome virus VR-2332, and porcine reproductive and respiratory syndrome virus–Lelystad virus beginning at nucleotides 1169, 1165, and 1165, respectively. *Indicates identical nucleotides. Degenerate primer sets for polymerase chain reaction were previously made to the underlined segments (41).