Lymphomas with a mature B cell phenotype were more common in Eμ-MycT/+;Bcl-w+/+ mice, while lymphomas from both Eμ-MycT/+;Bcl-w+/− and Eμ-MycT/+;Bcl-w−/− animals occasionally presented with a mixed pre-B/B cell immunophenotype (Fig. 2). The gene discussed is BCL2L2; the disease is lymphoma.