Abnormal metabolism of what neurotransmitter is believed to be involved in depression?

Question

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Abnormal metabolism of serotonin is believed to be involved in depression. Low levels of serotonin in the brain are thought to contribute to depressive symptoms such as low mood, anxiety, and insomnia. Antidepressant medications such as SSRIs (selective serotonin reuptake inhibitors) work by increasing the levels of serotonin available in the brain.

Abnormal Metabolism of What Neurotransmitter Is Believed to Be Involved