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Association between likelihood of depressive disorder diagnosis between ages 15 and 20 and chronic family stress at age 15 as a function of 5-HTTLPR and COMT genotypes. LV, 5-HTTLPR L homozygotes + COMT val158 homozygotes; LM, 5-HTTLPR L homozygotes + COMT met158 carriers; SV, 5-HTTLPR S carriers + COMT val158 homozygotes; SM, 5-HTTLPR S carriers + COMT met158 carriers.
