MYC and lymphoma: The level of p53 protein expression in stable cell lines derived from the ΔEBNA2 + Myc lymphomas is similar to that expressed in EBV-transformed LCLs (Fig 3D), while the p53-deleted Akata BL line as expected lacks p53 expression, and the Mutu I and P3HR1 BL cell lines (both of which have mutant p53) have massively increased p53 expression.