Relative risk of differential expression for genes with pplr < 0.0046. The relative risk that a gene would be differentially expressed given that it had n or more informative SNP in its 1 kb upstream region is shown for genes within the first three percentiles of the pplr distribution (pplr < 0.0046). The points on the graph have been spread around the integer values to make the individual error bars visible. There was no significant effect on relative risk for genes that had a pplr > 0.0046 after a Bonferroni correction for multiple testing. The error bars represent the 95% confidence interval of the relative risk.