MEF2B and splenic marginal zone lymphoma: Comparative analysis of MEF-2B with other germinal center antigens revealed that in differential diagnosis of B cell non-Hodgkin's lymphoma there was positive expression of MEF-2B in all FL (follicular lymphomas) and BL (Burkitt's Lymphoma), 8/9 of mantle cell lymphomas and 2/24 of Splenic marginal zone lymphomas (MZL) and 38/44 DLBCLs but negative expression in extranodal MZL and B-lymphoblastic lymphomas [196].