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The Genetic Origins of Europeans. Who are they related to?

The ancient populations from Siberia were related with the first humans that colonized the American continent during the Ice Age. According to a study published few days ago, they've mixed with ancient populations from Europe, leaving their footprint on modern Europeans' DNA. Until today, it was generally believed that Europeans are descendants of the two groups of populations. The first where hunter-gatherers located in the western regions of...