Schaub M, Stadlbauer TH, Chandraker A, Vella JP, Turka LA, Sayegh MH. Comparative strategies to induce long-term graft acceptance in fully allogeneic renal versus cardiac allograft models by CD28-B7 T cell costimulatory blockade: role of thymus and spleen. J Am Soc Nephrol. 1998 May; 9(5):891-8.