SLC6A4 and eating disorder: Very recently, DNA methylation profiles at promoter-associated CpG sites of the SCL6A4 gene, encoding for the serotonin transporter (SERT), and the serum KYN/TRP ratio were studied in a cohort of eating disorders patients, including 45 patients with restrictive AN, 21 with purging AN, 21 with bulimia (BN), 31 with binge eating disorders, 23 with unspecified feeding or eating disorders, 14 with other specified eating disorders, and 34 healthy controls.