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This study used proton magnetic resonance spectroscopy (1H MRS) to measure in vivo brain glutathione (GSH) in adolescents with major depressive disorder (MDD), and explored the relationship between GSH and illness severity and chronicity. Secondarily, associations between GSH and anhedonia, a key symptom of MDD in adolescents, were investigated.Occipital cortex GSH levels were obtained in 19 psychotropic...