As a result of the previous research, the so-called "9-repeat allele" (or variant) was found in all of the 41 Native American and Asian (from the western side of the Bering Strait) populations that were sampled. At the same time, the allele was absent in all 54 of the Eurasian, African and Oceanian groups that were also sampled in the study. The researchers supposed that the distribution of the allele was due to the fact that all these ethnic groups (modern Native Americans, Greenlanders and western Beringians) derived from a common founder population, which had been isolated from the rest of the Asian continent thousands of years prior to their migration to the Americas.