IFNG and neoplasm: We determined that the frequency of IFN-γ+ NK cells was remarkably decreased in tumour-infiltrating lymphocytes (TILs) and TdLNs of mice bearing H-2Kb and H-2Db KO tumours compared with those bearing WT tumours (Supplementary Fig. 7C), although the frequency and number of NK cells were comparable between the two groups (Supplementary Fig. 7A,B).