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Pairwise linkage disequilibrium (LD) analysis across the four DRD2 variants. Light grey: LD (moderate-to-high D’) between C957T and TaqIA and between C957T and -141C Ins/Del. White: almost no significant LD between the variants. Empty white: complete, but nonsignificant, LD between TaqIA and -141C Ins/Del.
