Aim of the study is measurement of NFAT-RGE (IL-2 (interleukin-2), IFN-γ (interferon-gamma), GM-CSF (granulocyte monocyte colony stimulating factor)) after tacrolimus (TAC) in de-novo immunosuppressed patients after liver transplantation (LT), to test the hypothesis that in de-novo TAC patients receiving mycophenolate mofetil (MMF) and steroids after LT there is an inverse correlation of NFAT-RGE and TAC peak levels at 1.5 hours after TAC intake.