As shown in the composite map, the quantitative trait locus (QTL) region of the Lith9 gene is localized on chromosome 17 in mice. A vertical line represents chromosome 17, with the centromere at the top; genetic distances from the centromere (horizontal black lines) are indicated to the left of the chromosomes in centimorgans (cM). Chromosomes are drawn to scale, based on the estimated cM position of the most distally mapped locus taken from Mouse Genome Database. The gallstone gene, the Lith9, QTL region is represented by a vertical red bar, and the Abcg5/g8 gene location is indicated by a horizontal borrow line. A genetic biomarker, D17Mit155, that is co-localized with Lith9 is indicated by a horizontal blue line with the marker symbol to the right