The results demonstrate that the PRRSV N protein level in cells transfected with pEGFP-N1-SLAMF1 was significantly lower than that in cells not transfected with pEGFP-N1-SLAMF1 at 36 h post-infection (HPI), but not significantly at other time points (Figure 2a). This evidence concerns the gene SLAMF1 and infection.