Anti-CD26/DPP4 monoclonal antibodies (2F9, 1F7, and YS110) blocked the interaction between the S protein and CD26/DPP4, thereby neutralizing MERS-CoV infectivity in Huh-7 and JKT/CD26 (human T cell leukemia expressing human DPP4) cells [78]. This evidence concerns the gene DPP4 and T-cell leukemia.