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Scientific mainstream is that I2a1b2a1 came to Balkans from eastern Europe. I visit Russian forums about genetic somethimes, and many people there think that I2a1b2a1 came to eastern Europe from Balkans. They claim migrations of Balkan tribes towards the eastern Europein in time of Roman conquest of Balkans.
I2a1b2a1 has peak in Dinaric Alps, and many people can not to conect mountains with Slavs.
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