Figure 2From: Heterogeneous antigenic properties of the porcine reproductive and respiratory syndrome virus nucleocapsid IVI-1173 clusters within genotype 1 subtype 1 PRRSV. The trees were constructed by the Neighbor Joining method and represent a phylogenetic analysis using 174 ORF5 (A) and 225 ORF7 (B) nucleotide sequences from GenBank. The subtypes are represented with different colours.Back to article page