Enables flavin adenine dinucleotide binding activity; identical protein binding activity; and primary amine oxidase activity. Involved in several processes, including negative regulation of serotonin secretion; positive regulation of dopamine metabolic process; and response to corticosterone. Located in mitochondrial outer membrane. Biomarker of Parkinson's disease and cholestasis. Human ortholog(s) of this gene implicated in Alzheimer's disease and Parkinson's disease. Orthologous to human MAOB (monoamine oxidase B). [provided by Alliance of Genome Resources, Apr 2022]