“…The efficacy of leflunomide and the MNA analogue, MNA 715 (FK778), for the prevention and treatment of rejection has been demonstrated in a number of models of allograft and xenograft rejection. MNA 715 dose‐dependently inhibits cardiac allograft rejection in mice 22 and rats, 23 prevents accelerated rejection of secondary rat cardiac allografts, 24 prevents and treats skin allograft rejection in rats, 25 and inhibits the development of graft‐versus‐host disease in mice 26 . MNA 715 also inhibits rejection in the mouse‐to‐rat skin 27 and hamster‐to‐rat cardiac xenograft models 28 .…”