Uyghurs
Contemporary scholars consider modern Uyghurs to be the descendants of a number of people, including the ancient Uyghurs of Mongolia who arrived at the Tarim Basin after the fall of the Uyghur Khaganate, Iranic Saka tribes, and other Indo-European peoples who inhabited the Tarim Basin before the arrival of the Turkic Uyghurs. DNA analyses indicate that the peoples of central Asia such as the Uyghurs are all mixed Caucasian and East Asian. Uyghur activists identify with the Tarim mummies, remains of an ancient people who inhabited the region, but research into the genetics of ancient Tarim mummies and their links with modern Uyghurs remains problematic, both to Chinese government officials concerned with ethnic separatism, and to Uyghur activists concerned that the research could affect their people's claim of being indigenous to the region.
Turkmens
The modern Turkmen people descend, at least in part, from the Oghuz Turks of Transoxiana, the western portion of Turkestan, a region that largely corresponds to much of Central Asia as far east as Xinjiang. Oghuz tribes had moved westward from the Altay mountains in the 7th century AD, through the Siberian steppes, and settled in this region. They also penetrated as far west as the Volga basin and the Balkans. These early Turkmens are believed to have mixed with native Sogdian peoples and lived as pastoral nomads until the Russian invasion of the 19th century.