Genetic analysis suggests that the Tarim Basin mummies from Xinjiang were not related to other ancient Indo-European populations, as previously suggested, but were indigenous "Ancient North Eurasians":
https://www.livescience.com/tarim-mummies-origins-uncovered
https://www.sciencedaily.com/releases/2021/10/211027121943.htm
Original paper at https://www.nature.com/articles/s41586-021-04052-7
Very interesting