ULBP3 and infection: Surprisingly, we observed that while the expression of ULBP3 and ULBP2 remained unchanged during SV40 infection (Figure 2B, quantified in Supplementary Figure 1), ULBP1 expression was significantly reduced at 48 hours following SV40 infection, reaching to a maximum of around 50% reduction 72 hours post infection (Figure 2B, quantified in Figure 2C and Supplementary Figure 1).