Presence of the duplication in wild mice.

Table showing the location of wild mouse collection and the fraction of total mice observed that tested positive for the duplication. The assay used does not distinguish between mice that are heterozygous for the duplication and those that are homozygous; both conditions are scored as positive. Abbreviations: “dom”: Mus musculus domesticus; “cast”: Mus musculus castaneous; “mus”: Mus musculus musculus. Mus spretus is a different species that is closely related to Mus Musculus.