Since depression is a common mental illness affecting an estimated 5% of people worldwide, investigators are encouraged to develop effective antidepressants. According to the monoamine-deficiency hypothesis, the underlying pathophysiology of depression is a deficiency of some neurotransmitters (serotonin, norepinephrine, or dopamine) in the central nervous system. The neurotransmitter serotonin has drawn the most attention concerning depression.
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