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A serotonin deficiency state has been implicated in alcohol-dependent individuals' experience of obsessive–compulsive alcohol craving. Because the serotonin transporter (5-HTT) functions to remove serotonin from the synapse, it is thought that increased reuptake (indicated by the number of high-expressing L A alleles present in the 5-HTT gene-linked polymorphic region [5-HTTLPR] of the SLC6A4...
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