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Actually, being nomadic may not have been hugely significant. Kazakhs were historically nomads and northern Kazakhs, southern Kazakhs, and Kyrgyzes are mostly the same. It was discussed briefly here. There's also a Kazakh user here (mutabor) that said Kazakhs don't have significant genetic diversity. I agree with your "city (Dushanbe) vs. rural comparison". I think Dushanbe may have been a bit of an outlier.
Another thing. A Turkish user (Irle) claimed that a Turkmen invader sample showed modern Anatolian Turks to have close to 40% of their DNA. He said he'd provide me a link for it later, but mysteriously got banned.
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