The geography of recent genetic ancestry across Europe.

PLoS Biol · 2013 · PMC3646727 · PMID 23667324

Europe PMC DOI

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may be significantno p-value reported

This variation was significant only for blocks shorter than 2 cM across all population pairs, with the exception of pairs of Portuguese individuals, where the upwards bias may be significant as high as 4 cM.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.