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Phylogenetic analyses and NSP2-deduced amino acid alignment of the SD-R and HuN4 strains. (A) Phylogenetic tree of SD-R and HuN4 based on all the ORF5 sequences of PRRSV. The five lines with different colors represent the five types of PRRSVs. Both SD-R and HuN4 are labeled with white pentagons. (B) The NSP2 deletion pattern in SD-R and HuN4: 131-aa discontinuous deletions are labeled with a light-yellow background; 30-aa discontinuous deletions are labeled with a light blue background.
