Viability was calculated as the percentage of viable cells among BIIB021-treated cells vs. DMSO-treated cells. Each cell line was cultured with 5 µ M BIIB021 for the indicated times (left) or with the indicated concentrations of BIIB021 for 96h (right). The filled markers represent EBV-positive cell lines and the open markers represent EBV-negative cell lines. (E) Human PMBCs, isolated from three healthy volunteers, were cultured with DMSO or 5 µ M BIIB021 for 96h. Viability was calculated as the percentage of viable cells among BIIB021-treated cells vs. DMSO-treated cells. Bars indicate