“…The efficacy and safety of FK 506 therapy has been demonstrated when used for prevention of solid organ transplant rejection [18,19] and in treatment of autoimmune diseases such as psoriasis [20], uveitis [21], type I diabetes mellitus [22], pediatric autoimmune enteropathy [23], and Crohn's disease [24]. FK 506 is an effective immunosuppressive agent which acts primarily on CD4+ T-helper lymphocytes by inhibiting the production of lymphokines, principally IL-2, at the transcriptional level.…”