Figure 1.

Position and size of the DNA segment of M. spretus origin in the M. musculus background for 97C, an IRCS used in the study. The segments of M. spretus origin are displayed in yellow. The small horizontal bars represent the position of genetic markers analyzed to build the map (see details in [14]). The picture was drawn before the analysis of testis expressional data, and a new segment found on chromosome 6 is thus not represented (see text); this segment is clearly visible on the expression profiles of chromosome 6 (Figure 6).