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Feb 10, 2015 Yamnaya graves that are dated to 3300-2700 BC are in the R1b-P297(1), R1b-L23*(1) and R1b-Z2103(5) haplogroups.
Massive migration from the steppe is a source for Indo-European languages in Europe, Haak et al. 2015 http://biorxiv.org/content/early/2015/02/10/013433