Correlation between eQTL p values and LD (R2) between all eQTLs and the top eQTL in nucleus accumbens (rs1948, correlation r2=0.68, A) and skeletal muscle (rs880395, correlation r2=0.92, B) for CHRNA3. Diamonds: CHRNA5-enhancer rs880395, triangle: nonsynonymous CHRNA5 rs16969968, square: CHRNA3-enhancer (brain) rs1948, and a potential additional regulatory haplotype for CHRNA3 tagged by rs8042374 (inverted triangle, not studied further). While the nonsynonymous rs16969968 SNP is listed as an eQTL in muscle, this result is attributable to LD with rs880395.