ZPBP and infection: Following infection with Nano-FMDV-HS+, the analyses of collected supernatants from the non-recombinant parental (SP Strain 38) and four recombinant (SP38-Mix, SP38-Low, SP38-Med, SP38-High) cell types showed a comparable increase in nanoluciferase activity over the duration of the experiment; as expected, these results confirmed that all the Strain 38-derived cell types had facilitated equivalent uptake of the cell culture-adapted virus regardless of their respective level of αvβ6 expression.