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Tryptophan depletion (TD) is an established method to influence the serotonergic system and mood. The purpose of this study was to examine the effect of TD under different ambient light conditions, measured through serotonin-associated plasma levels and a visual analog scale (VAS), on healthy females.Thirty-eight healthy female s-allele carriers of the serotonin transporter promoter gene (5-HTTLPR)...
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