A new study from researchers at Duke University in Durham, NC, finds that mice deficient in serotonin are more vulnerable to social stressors than a group of healthy control mice.

Low serotonin levels have traditionally been suspected as playing a role in depression, but there has been little solid evidence to support this hypothesis. Consequently, scientists have been increasingly moving away from the low-serotonin theory and looking instead at other possible causes of depression, such as the relationship between stress and inflammation and other environmental factors.

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