Kim KS, Denton MD, Chandraker A, Knoflach A, Milord R, Waaga AM, Turka LA, Russell ME, Peach R, Sayegh MH. CD28-B7-mediated T cell costimulation in chronic cardiac allograft rejection: differential role of B7-1 in initiation versus progression of graft arteriosclerosis. Am J Pathol. 2001 Mar; 158(3):977-86.