CD274 and Epstein-Barr virus infection: The association between the EBV infection and the expression of PD-Ls were previously investigated using a humanized mouse model of DLBCL: while mock-infected B-cells had low levels of PD-L1 and low to no expression of PD-L2 (assessed by flow cytometry), both PD-L1 and PD-L2 had increased expression in the same cells when infected by EBV viral strains B95.8 and M81.