Using mice, researchers have demonstrated a link between an individual’s immune system and the susceptibility to depression. Employing bone-marrow transplants to study the effects of Interleukin-6 (IL-6) levels in the rodents, they found evidence of a strong correlation between higher levels of the cytokine and a propensity toward depression. This suggests a possible mechanism involved in the observed tendency for susceptibility to depression being hereditary. Ars Technica has the details: http://arstechnica.com/science/2014/11/immune-activity-linked-to-a-predisposition-to-depressive-behavior/

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