Interestingly, while EBV+ LCLs and PTLD cells show robust expression of CD39 and measurable expression of CD73, EBV+ PEL (BC1 and JSC1) and EBV+ Burkitt lymphoma (Daudi and Raji) cell lines exhibit little to no detectable ectonucleotidase expression. This evidence concerns the gene NT5E and Burkitt lymphoma.