The mixed tumours in gld/gld mice were indeed comparable with tumours in wild-type C57 mice (Supplementary Fig. 7c–e) where other cell populations may be an additional source of FASL, supporting a specific role for CAF-mediated FASL in T cell deletion observed both in vivo and in vitro (Fig. 3). The gene discussed is FASLG; the disease is neoplasm.