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MAOA |
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One of the gene variants fields weak MAOA activity in the brain, resulting in elevated concentrations of serotonin. Monkeys and rats with low or nonexistent MAOA levels have demonstrated a greater tendency toward aggressive behavior than their counterparts with normal functioning levels. Situated on the X chromosome, the MAOA gene yields an enzyme that lowers brain concentrations of chemical messengers such as norepinephrine, serotonin, and dopamine. |
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