FMO3 and viral hepatitis: Interestingly, mRNA levels for FMO3 are uniquely repressed in patients with more severe AH (AH with liver failure [MELD 22–28] and AH with emergency liver transplant [MELD 18–21]), but not in other liver disease etiologies such as non-alcoholic fatty liver disease (NAFLD) or viral hepatitis (Figure 1C).