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Info about Slavs being subjugated by the Avars was only about the Dulebes (not all Slavs):
https://en.wikipedia.org/wiki/Dulebes
So far all Scythian R1a samples belong to R1a-Z93, which is the Indo-Iranic branch of R1a.
R1a in modern Greece belongs to typically Slavic subclades under R1a-M458 and R1a-Z280.
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Comments from Eurogenes blog about Slavic admixture in modern Southern Greece:
http://eurogenes.blogspot.com/2017/0...tion-bias.html
Interesting read, "The plague pandemic and Slavic expansion in the 6th-8th centuries":
http://www.antropologia.uw.edu.pl/AS/as-005.pdf
It is possible that Slavs had a higher immunity to plague than Non-Slavic populations.
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