As depicted in Figure 2C, the mRNA expression levels of US3 genes of PRVΔTK&gE-US3deop−1, PRVΔTK&gE-US3deop−2, and PRVΔTK&gE-US3deop−3 were significantly lower than that of PRVΔTK&gE-AH02 at 10 h post-infection (p < 0.001). Here, RPS3 is linked to infection.