Possible routes into East Asia by the ancestors of East Asian-related populations include a northern route model from Central Asia, and a southern route model from Southeast Asia.[5] A third route into Northern Siberia was used by a distinct population, represented by the Ancient North Eurasians, which however did not contribute ancestry to modern East Asians, but were deeply related to European hunter-gatherers. These Ancient North Eurasians however received geneflow of an early East Asian-related population (ancestral to East and Southeast Asians), contributing between 14% to 31% ancestry towards analyzed ANE-associated samples, such as the Mal'ta–Buret' 1 sample.