EXO1 and HIV-1 infection: The failure of RNAi-mediated Exo1 depletion to restore replication of vpr-deficient HIV-1(vpr.Q8*) to levels seen for HIV-1(vpr.wt) is evidence that Exo1 is not the only Vpr-antagonized protein inhibiting HIV-1 infection in CEM.SS T cells.