Ohl?n C, Kalos M, Cheng LE, Shur AC, Hong DJ, Carson BD, Kokot NC, Lerner CG, Sather BD, Huseby ES, Greenberg PD. CD8(+) T cell tolerance to a tumor-associated antigen is maintained at the level of expansion rather than effector function. J Exp Med. 2002 Jun 03; 195(11):1407-18.