DLL4 and immune system disorder: Nevertheless, it will be intriguing to elucidate the roles of DLL4+ Mo-LCs because DLL4+ Mo-LCs may be responsible for T cell activation in autoinflammatory immune diseases such as psoriasis (5–7, 13, 24, 28, 29, 33, 35, 59) and may also be efficacious for cancer treatment (24, 27, 35, 57, 60).