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E-Mail IMAGE: Jonas Svensson, postdoc researcher Center for Psychiatry Research Department of Clinical Neuroscience, Karolinska Institutet view more Credit: Lou Almskog Low levels of serotonin in the brain are seen as a possible cause of depression and many antidepressants act by blocking a protein that transports serotonin away from the nerve cells. A brain imaging study at Karolinska Institutet now shows that the average level of the serotonin transporter increased in a group of 17 individuals who recovered from depression after cognitive behavioural therapy. The results are published in the journal Translational Psychiatry. Our results suggest that changes to the serotonin system are part of the biology of depression and that this change is related to the episode rather than a static feature - a state rather than a trait, says the study s last author Johan Lundberg, researcher at the Department of Clinical Neuroscience, Karolinsk ....