CD1D and infection: To identify the late EBV gene product(s) responsible for interference with Ag presentation observed during productive infection, we took the approach of expressing individual, or combinations of late viral genes in 293T-CD1d cells through plasmid transfection (Fig 1B and 1C) and/or in MJS-CD1d cells via lentiviral transduction (Figs 1D and S1).