To identify putative cis-eQTL SNPs for OPRM1, we utilized SNP genotype and gene expression data (see Supplement) available on post-mortem dorsolateral prefrontal cortex samples from 110 European Americans and 114 African Americans, ranging in age from 0 to 78 years old, who had no neuropathological or neuropsychiatric diagnoses, no drug or alcohol abuse, and no positive toxicology result (32-34).
