G3BP1 and infection: USUV infection did not induce SG formation at 24 h p.i., and only a slight number of G3BP1 foci were detected at 48 h p.i. Remarkably, USUV-infection induced a significant reduction in the number of cells with ArsNa-induced SGs at 24 h p.i., showing even a sharper decrease in the number of cells containing ArsNa-induced SGs at 48 h p.i. (Fig 5A and 5B).