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Diagram of the OPRD1 gene (Chr1: 29138654-29190208) and the six SNPs genotyped in this study. Gray boxes indicate exons and boxes with diagonal lines indicate untranslated regions. The residue numbers and encoded amino acids of the synonymous and non-synonymous variants are included after the SNP IDs. SNP and exon locations taken from the February 2009 build of the human genome in UCSC Genome Browser (http://www.genome.ucsc.edu).
