Monoamine oxidase A

…one of two neighboring gene family members that encode mitochondrial enzymes which catalyze the oxidative deamination of amines, such as dopamine, norepinephrine, and serotonin.… associated with a variety of other psychiatric disorders… 59% of Black men, 54% of Chinese men, 56% of Maori men, and 34% of Caucasian men carried the 3R allele, while 5.5% of Black men, 0.1% of Caucasian men, and 0.00067% of Asian men carried the 2R allele.…

FWIW