Figure 1.

Distribution of samples analyzed in this study. Blue circles: Mus musculus domesticus (Mmd); yellow diamond, red squares, violet triangles and pink circles: M. m. musculus (Mmm). Different symbols represent distinct protein variants of the ligand-binding region (LBR). Individuals were assigned to the subspecies using hybrid index based on five X-linked loci. Dashed line represents the hybrid zone between two subspecies. Besides sampling localities of free-living populations, the localities of wild-derived strains origin are shown.