Figure 1. . . Alignment of amino acid sequences of partial nonstructural protein 2 corresponding to aa 404–640 of ORF1a for porcine reproductive and respiratory syndrome virus (PRRSV) isolates. Sequences are for PRRSV from infected herds in Thailand; highly pathogenic PRRSV isolates from the People’s Republic of China and Vietnam; and strain VR2332, the North American PRRSV prototype. Dashes represent deletions of amino acid residues.
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