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Phylogenetic trees of the 40 PRRSV isolates of Central China based on the complete genomic sequences and amino acids sequences of NSP2, GP3 and GP5. Four unrooted neighbor-joining trees were constructed from the aligned complete genomic sequences and amino acids sequences of NSP2, GP3, GP5 and ORF5a of the 40 PRRSVs of Central China by the distance-based neighbor-joining method using the MEGA software (Version 5.1). Bootstrap values were calculated on 1,000 replicates of the alignment.
