MS4A1 and lymphoma: Concerning CD20 alternative splice variants, we have demonstrated that the 20mer D393-CD20 peptide spanning the splicing site might be targeted by the immune system, and we have shown that D393-CD20—specific CD4 Th1 clones could directly recognize malignant B cell lines and kill autologous lymphoma B cells, indicating that D393-CD20—derived epitopes are naturally processed and presented on tumor cells [41].