Fas ligand (FasL) mRNA expression in liver allografts, isografts and normal livers. Reverse transcriptase-polymerase chain reaction (RT-PCR) products of FasL are shown. The relative expression to β-actin is shown at the bottom. D, post-operation day; N, normal liver; Syn1, syngeneic OLT (DA-DA) POD7; Syn2, syngeneic OLT (PVG-PVG) POD14.