The results of studies investigating the role of biological factors suggest that depression is caused by

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Studies have found that individuals with certain variations of the serotonin transporter gene are more susceptible to developing depression. These variations affect the reuptake of serotonin, a neurotransmitter that plays a key role in regulating mood. A decrease in serotonin levels is generally associated with an increased risk of depression.

The Results of Studies Investigating the Role of Biological Factors