Underactivity of all of the following neurotransmitters have been linked to depression EXCEPT

Question

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GABA (gamma-aminobutyric acid) is primarily involved in inhibitory neurotransmission in the brain. While alterations in GABAergic systems have been observed in depression, the classic neurotransmitter systems most consistently linked to depression through underactivity are serotonin, dopamine, and norepinephrine. GABA's role in depression is more complex and not simply associated with underactivity in the same way as these other neurotransmitters.

Underactivity of All of the Following Neurotransmitters Have Been Linked