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.
Tarim mummies
Mair claims that "the earliest mummies in the Tarim Basin were exclusively Caucasoid, or Europoid" with east Asian migrants arriving in the eastern portions of the Tarim Basin around 3,000 years ago while the Uyghur peoples arrived around the year 842. In trying to trace the origins of these populations, Victor Mair's team suggested that they may have arrived in the region by way of the Pamir Mountains about 5,000 years ago.