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			"As previously reported [11], the formation of the Slavic people (...) had a significant impact on the populations of Northern and Eastern Europe, a result that is supported by an analysis of identity by descent segments in European populations [10]. Here, despite characterizing populations by genetic similarity rather than geographic labels, we infer the same events involving a “Slavic” source (represented here by a cluster of Lithuanians; lithu11 and colored light blue) across all Balkan groups in the analysis (Greece, Bulgaria, Romania, Croatia, and Hungary) as well as in a large cluster of Germanic origin (germa36) and a composite cluster of eastern European individuals (ukrai48; Figures 4A and 4B )."