Fas Ligand (FasL), also known as Tumor necrosis factor ligand superfamily member 6 or CD95 ligand is a cytokine that binds to TNFRSF6/FAS/CD95, a receptor that transduces the apoptotic signal into cells. Fas Ligand is involved in cytotoxic T-cell-mediated apoptosis, natural killer cell-mediated apoptosis and in T-cell development. It also initiates fratricidal/suicidal activation-induced cell death (AICD) in antigen-activated T-cells contributing to the termination of immune responses. TNFRSF6/FAS-mediated apoptosis has also a role in the induction of peripheral tolerance. Rat Fas Ligand has 93% amino acids sequence identity with mouse Fas Ligand.
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