For example, exonic variants were not found to predispose to disease development in patients with hemochromatosis [17], and transgenic animals carrying the K18 R90C variant were markedly susceptible to Fas- but not TNFα-induced apoptosis as well as to thioacetamide- but not carbon tetrachloride-induced liver fibrosis [32]. This evidence concerns the gene FAS and Hepatic fibrosis.