No association between the serotonin transporter promoter region (5-HTTLPR) and the dopamine D3 receptor (BalI D3DR) polymorphisms and heroin addiction.
Kotler M, Cohen H, Kremer I, Mel H, Horowitz R, Ohel N, Gritsenko I, Nemanov L, Katz M, Ebstein R. Mol Psychiatry. 1999 Jul; 4(4):313-4.