MITF and lymphoma: After 1 week, NK cells from these mice were purified from their spleens and co-cultured at two different effector/target ratios (E/T) with irradiated B16/F10, or B16/F10-MITF-KO cells, as well as with the moloney leukemia virus-transformed mouse lymphoma cell line YAC-1 used as a control [24].