Correlation between opioid-related phenotypes and striatal gene expression. Comparison was performed using gene expression values of 1528 probe-sets significantly different between 129P3/J, DBA/2J, C57BL/6J and SWR/J strains . Correlations between gene expression and morphine-related traits for RI BXD strains were computed using HBP/Rosen Striatum M430 v2.0 (Apr05) PDNN Clean dataset [69, 70]. All analyses were evaluated using the Pearson's correlation. Probe-sets overlapped in both analyses are presented in two tables on the left and right. Presented below scatterplots of correlation between expression values of two genes (Khdrbs1 and Atp1a2) emphasized in the table by blue colour and phenotypic data were generated by using WebQTL.