The function of Ensembl gene identifier ENSG00000069535 (MAOB, monoamine oxidase B) is as follows. Catalyzes the oxidative deamination of primary and some secondary amines such as neurotransmitters, and exogenous amines including the tertiary amine, neurotoxin 1-methyl-4-phenyl-1,2,3,6- tetrahydropyridine (MPTP), with concomitant reduction of oxygen to hydrogen peroxide and participates in the metabolism of neuroactive and vasoactive amines in the central nervous system and peripheral tissues (PubMed:11049757, PubMed:11134050, PubMed:20493079, PubMed:8316221, PubMed:8665924). Preferentially degrades benzylamine and phenylethylamine (PubMed:11049757, PubMed:11134050, PubMed:20493079, PubMed:8316221, PubMed:8665924). {ECO:0000269|PubMed:11049757, ECO:0000269|PubMed:11134050, ECO:0000269|PubMed:20493079, ECO:0000269|PubMed:8316221, ECO:0000269|PubMed:8665924}.