B-cell activation (eg, via B-cell receptor [BCR] and CD40 engagement) induces the expression of dual-specificity phosphatase (DUSP4), which negatively regulates c-JUN N-terminal kinase (JNK) 1/2 by dephosphorylation, resulting in apoptosis. Inhibition of BTK and JNK1/2 acts synergistically to promote apoptosis of lymphoma cells.© Rickert R., 2015. Originally published in J Exp Med. doi:10.1084/ jem.2125insight2.