eQTL mapping for DHCR7 on chromosome 5. The LRT curves for the gene DHCR7 are represented in blue (plain line for the factor-adjusted analysis and dotted line for the raw analysis). The LRT curve for the AF trait is represented in red. The plain curves reveal the existence of a QTL/eQTL for the 2 traits in the same region, around 175 cM on the GGA5 chromosome. This colocalization is not revealed by the raw analysis. The Significance level of 5% is represented by the horizontal green line. The genetic distances (cM) and likelihood ratio (LR) are shown on the X-axis and Y-axis, respectively.