- Association between the dopamine D3 receptor gene locus (DRD3) and unipolar affective disorder. Dikeos, D.G., Papadimitriou, G.N., Avramopoulos, D., Karadima, G., Daskalopoulou, E.G., Souery, D., Mendlewicz, J., Vassilopoulos, D., Stefanis, C.N. Psychiatr. Genet. (1999)