Heterozygous variation of MAO-B meaning

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Complex topic in genetic biology, can someone simplify generally what this means? I understand some of the neurotransmitter imbalance.

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MAO-B is an enzyme encoded by the *MAOB* gene. Heterozygous refers to having two different alleles (as opposed to homozygous, two identical alleles) of a given gene. Variation is ambiguous here without more context.