Fig. 1.

Hydrophilicity plot of PRRSV N protein. The analysis of hydrophilicity was performed according to Hopp and Woods (1981). The inset contains the complete amino acid sequence of the N protein from SDSU-23983, the PRRSV isolate used in this study. Domains that formed NLS motifs were identified using the PSORT computer program (Nakai and Kanehisa, 1992) and labeled NLS-1 and NLS-2. A hydrophobic region, between amino acids 106 and 117, contained a potential nuclear export signal (NES) sequence.