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==Human genetics==
{{main|Genetic history of Indigenous
The European distribution of [[Y-chromosome]] [[haplogroup]] [[R1a]] has been suggested to have occurred as a result of receding glacial activity, allowing males bearing the lineage from the present day territory of Ukraine to migrate and gradually populate central, northern, and western Europe.<ref>{{cite journal |last=Passarino |year=2002 |title=Different genetic components in the Norwegian population revealed by the analysis of mtDNA and Y chromosome polymorphisms |journal=Eur. J. Hum. Genet. |volume=10 |issue=9 |pages=521–9 |doi= 10.1038/sj.ejhg.5200834|pmid=12173029 |display-authors=etal|doi-access=free }}</ref>
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