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Expression levels of SLC6A4 normalized to GUSB expression levels in (A) Gilles de la Tourette syndrome (GTS)-only, GTS+obsessive-compulsive disorder (OCD) or GTS—all individuals and controls and (B) GTS—all individuals and controls with different three-locus genotypes (LAC/LAC, LAC/LG or LAT, or Non-LAC). Box plots indicate median, quartiles and outliers. ***, p < 0.001; NS, not significant.
