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According to most recent studies modern Ainus have around 65-80% Jomon ancestry, who themselves were a mainly East-Eurasian population, from whom the so-called Mongoloid people originate from. The Japanese islands did get to a certain degree some West Eurasian admixture in prehistory, coming from Siberia, but the East Eurasian majority never changed there. Modern Ainus also did admix a lot with modern Japanese people, so they are overwhelmingly East Eurasian today.
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