CD40LG and Burkitt lymphoma: We selected a panel of IgM+ human lymphoma cell lines that included mantle cell lymphoma (JEKO-1, GRANTA-519, UPN-1, UPN-2, MAVER-1, MINO and Z138), Burkitt lymphoma (BL-41 and BJAB) and chronic lymphocytic leukaemia (MEC-1).