FMO5 and autoimmune hepatitis: The amount of ROS found in AIH livers was significantly higher than in healthy human livers.Markers of lipid peroxidation were significantly elevated in patients with AIH compared with normal controls.Red blood cell glutathione (GSH) concentrations were significantly lower in AIH than normal controls, but plasma GSH peroxidase activity was significantly higher in AIH patients with elevated ALT values compared with normal controls.Homologs of NADPH oxidases (NOXs) are major sources of ROS and was expressed in human livers with stage 2-3 AIH.