FMO5 and neurodegenerative disease: Various mechanisms of induction of oxidative stress in neurodegenerative diseases have been proposed, including augmented ROS production in the mitochondria of neurons and glia, reactions of transition metal ions, reactions of dopaquinones, increased activity of monoamine oxidase, activation of NADPH oxidase, activation of N-methyl-D-aspartate receptor, and inflammation [34,44,45,46].