Figure 2: Genome-wide scan for plasma TG concentrations in F2 male mice. (a) A histogram showing the distribution of plasma TG concentrations. (b) Genome-wide LOD score plot of single-QTL scans for plasma TG concentrations (solid lines: cross direction as an additive covariate; broken lines: cross direction and body weight as additive covariates). The -axis represents the Chrs and microsatellite marker positions, and the -axis represents the LOD score. The horizontal broken lines indicate the genome-wide threshold LOD score for significant () and suggestive () linkage, respectively.