CP and lymphoma: The inability of this cell line (which is maintained in the presence of EBNA2 expression and thus presumably uses the Cp to drive EBNA genes) to cause tumors suggests that differences in the viral gene expression pattern in newly P3HR1-infected B cells (such as the use of Wp instead of Cp) versus the long-term P3HR1-infected LCL are important for the ability of the P3HR1 virus to induce lymphomas in CBH mice.